INSTALLATION MANUAL



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INSTALLATION MANUAL

Horizontal Fan Coil Models:

SEHX - DX Cooling w/ Electric Heat, Uncased SDXW - DX Cooling w/ Hot Water Heat, Uncased

CEHX – DX Cooling w/ Electric Heat, Cased CDXW – DX Cooling w/ Hot Water Heat, Cased

SCWE – Chilled Water Cooling w/Electric Heat, Uncased-2P SCWW – Chilled Water Cool w/Hot Water Heat, Uncased-2P

CCWE – Chilled Water Cooling w/Electric Heat, Cased-2P CCWW – Chilled Water Cooling w/Hot Water Heat, Cased-4P

LIST OF SECTIONS

1 – General 1 7 – Hot Water and Chilled Water 15

2 – Safety, Mounting, General, Dimensional & Nomenclature Info 2 8 – Line Voltage Wiring 19

3 – Clearance and Return Air Requirements 8 9 – Thermostat Wiring and Connections 21

4 – Fan Coil and Supply Air Duct Installation 10 10 – Motor, Blower and Furnace Startup 25

5 – Fan Coil Installation 11 11 – Final System Checkout 26

6 – Refrigerant Piping, TXV, Flowrator & Condensate Drain Info 11 12 – Wiring Diagrams 27

LIST OF FIGURES

1 – Cased Enclosure Mounting 3 19 – Component Locations – No Heat Control Box 20

2 – CEHX/CCWE Dimension Data DX Cool w/ or w/o Elect Heat 6 20 – Component Locations – Hydronic Heat Control Box 20

3 – SEHX/SCWE Dimension Data Chill Water w/ or w/o Elect Heat 7 21 – Separate TStat, Separate Fan Coil and Cooling Units 22

4 – Clearance – Access for Service 9 22 – Separate TStat, Separate Trans, Separate Fan Coil and Cooling 22

5 – Ceiling Access Panel 10 23 – Same TStat, Separate Trans, Separate Fan Coil & Cooling Units 22

6 – Evaporator Below Condenser Piping 11 24 – Same TStat, Same Trans, Separate Fan Coil & Cooling Units 22

7 – The TXV Bulb Best Location 12 25 – Honeywell T9611Heat Pump Thermostat Connections 23

8 – TXV Sensing Bulb Location 13 26 – White Rodgers Multistage Heat / Cool T’stat Connections 23

9 – Typical TXV Connections 14 27 – White Rodgers Heat / Cool 2 Trans T’stat Connections 23

10 – Flowrator Distributor Assembly 14 28 – White Rodgers Multistage Heat / Cool / HP T’stat Connections 24

11 – Proper Mounting of the SHL Temperature Switch 15 29 – PSC Blower Assembly 25

12 – Proper Wiring of the SHL Temperature Switch 15 30 – PSC Blower Assembly 26

13 – Diagram of the Heating Cycle of a Heat Pump 15 31 – Blower Housing 26

14 – Diagram of the Cooling Cycle of a Heat Pump 15 32 – Wire Diagram 3kW-10kW Electric HT-PSC Motor 27

15 – Condensate Drain Pan 16 33 – Wire Diagram 3kW-10kW Electric HT- PSC Motor 27

16 – Typical Condensate Trap 16 34 – Wire Diagram 3kW-10kW Electric HT- PSC Motor w/ Lockout 28

17 – DX - Hydronic Components and Water Connections 17 35 – Wire Diagram Hydronic Heat – PSC Motor 28

18 – Component Locations – Electric Heat Control Box 20 36 – Wire Diagram Hydronic Heat – PSC Motor w/ Freeze Sensor 29

LIST OF TABLES

1 – SEHX General Specifications 4 14 – SDXW/CDXW/SCWW/CCWW 18-30 - Hot Water Capacity 17

2 – CEHX General Specifications 4 15 – SDXW/CDXW/SCWW/CCWW 31-37 – Hot Water Capacity 17

3 – SCWE General Specifications 4 16 – SEHX/CCWE/SCWE/CCWE 18-30 Chilled Water Capacity 18

4 – CCWE General Specifications 4 17 – SEHX/CCWE/SCWE/CCWE 31-37 Chilled Water Capacity 18

5 – SDXW General Specifications 5 18 – Wiring Requirements 208/230 VAC Electric Heat 18-37 Models 19

6 – CDXW General Specifications 5 19 – Wiring Requirements 120 VAC Hydronic Heat 18-37 Models 19

7 – SCWW General Specifications 5 20 – Electric Heater Data 20

8 – CCWW General Specifications 5 21 – Low Voltage Wire Gauge and Maximum Lengths 21

9 – CEHX/CCWE/CDXW/CCWW Dimensional Data 6 22 – White Rodgers Thermostat Terminal Designations 23

10 – SEHX/SCWE/SDXW/SCWW Dimensional Data 7 23 – Typical Fan Coil Unit TStat Pigtail Wire Colors & Connections 24

11 – SEHX/CEHX/SCWE/CCWE Model Nomenclature 8 24 – Typical Cooling Unit Thermostat Wire Colors & Connections 24

12 – Clearance to Combustibles 9 25 – Typical Heat Pump Thermostat Wire Colors & Connections 24

13 – Optional Ceiling Access Panels 10

SECTION I: GENERAL

The following list includes important facts and information regarding the electric furnace and its inclusions.

1. Horizontal Fan Coil Unit is rated at either 120 volts AC or 240 volts AC at 60 Hertz - 1 Phase

2. Horizontal Fan Coil Unit is not designed to operate with a 50 HZ voltage supply.

3. Horizontal Fan Coil Unit size varies by model

4. Four-wire thermostat operation for heating and cooling

5. Seven wire thermostat for heat pump operation.

6. Horizontal Fan Coil Unit is equipped with blower for A/C or Heat Pump operation

7. This Horizontal Fan Coil Unit is designed for horizontal applications only.

8. This air handler must not be operated without the door installed

NOTE: This Horizontal Fan Coil Unit and its components listed on the A/C and Heat Pump equipment sticker were listed in combination as a system by ETL for the United States and Canada.

SAVE THIS MANUAL FOR FUTURE REFERENCE

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SECTION II: SAFETY

[pic] This is a safety alert symbol. When you see this symbol on labels or in manuals; be alert to the potential for personal injury.

Understand and pay particular attention to the signal words DANGER, WARNING, or CAUTION.

DANGER: indicates an imminently hazardous situation, which if not avoided, will result in death or serious injury.

WARNING: indicates a potentially hazardous situation, which if not avoided, could result in death or serious injury.

CAUTION: indicated a potentially hazardous situation, which if not avoided, may result in minor or moderate injury. It is also used to alert against unsafe practices and hazards involving property damage.

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Safety Requirements

This appliance should be installed in accordance with all national and local building/safety codes and requirements, local plumbing or waste water codes, and other applicable codes. In the absence of local codes, install in accordance with the following codes.

• Standard for the Installation of Air Conditioning and Ventilating Systems (NFPA 90A)

• Standard for the Installation of Warm Air heating and Air Conditioning Systems (NFPA 90B)

• National Electrical Code (NFPA 70)

• Canadian Electrical Code, Part I (CSA C22.2) or ANSI/NFPA No. 70

• All local codes (State, City, and Township)

NOTE: All applicable codes take precedence over any recommendation made in these instructions.

SunTherm assumes no responsibility for units installed in violation of any code or regulation.

1. Refer to the unit rating plate for the air horizontal fan coil unit model number, and then see the dimensions page of this instruction for return air plenum dimensions in Figure 2 and Table 9. The plenum must be installed according to the above listed codes or the instructions in this manual.

2. Refer to the dimensions page of this instruction to determine the proper location to install the horizontal fan coil unit for horizontal applications.

3. These models ARE NOT ETL listed or approved for installation into a Manufactured (Mobile) Home.

4. Provide clearances from combustible materials as listed under Clearances to Combustibles.

5. Provide clearances for servicing ensuring service access is allowed for the control box, electric elements, hot water coil and the blower.

6. Check the rating plate and the power supply to be sure the electrical characteristics match.

7. Failure to carefully read and follow all instructions in this manual can result in malfunction of the horizontal fan coil unit, death, personal injury, and/or property damage.

8. Electric horizontal fan coil unit shall be installed so the electrical components are protected from water.

9. Installing and servicing heating/cooling equipment can be hazardous due to electrical components.

10. Only trained and qualified personnel should install repair or service heating/cooling equipment. Untrained service personnel can perform basic maintenance functions such as cleaning of exterior surfaces and replacing the air filters. Observe all precautions in the manuals and on the attached labels when working on this appliance.

11. These instructions cover minimum requirements and conform to existing national standards and safety codes. In some instances these instructions exceed certain local codes and ordinances, especially those who have not kept up with changing home construction practices. These instructions are to be followed and are the minimum requirement for a safe installation.

12. The size of the unit should be based on an acceptable heat loss calculation for the structure. ACCA, Manual J or other approved methods may be used.

13. The 115 VAC models use nominal 115 VAC, 1 Phase, 60-Hertz power supply. DO NOT CONNECT THIS APPLIANCE TO A 50 HZ POWER SUPPLY OR A VOLTAGE ABOVE 132 VOLTS OR BELOW 98 VOLTS..

14. The 208/230 VAC models use nominal 208 or 230 VAC, 1 Phase, 60-Hertz power supply. DO NOT CONNECT THIS APPLIANCE TO A 50 HZ POWER SUPPLY OR A VOLTAGE ABOVE 253 VOLTS OR BELOW 187 VOLTS.

15. Ground connections MUST BE securely fastened to the control box and ground wires MUST BE secured to the ground lugs in the control box.

16. Duck work must be installed in accordance with the standards of the National Fire Protection Association (NFPA) for the installation of Air Conditioning, Warm Air Heating and Ventilation Systems (NFPA 90A and 90B). The air distribution duct should be sized for 0.2 inches of static pressure. See National Environmental Systems Contractors Association Manual K for duct sizing.

17. The safety testing label appearing on this unit covers the unit and the factory installed coil (if provided) only. It does not cover any other equipment.

18. Exterior surface of the cabinet may sweat when installed in a non-conditioned space such as a attic or garage. Installer must provide a protection such as a full size auxiliary drain pan under all units installed in the non-conditioned space. The drain pan is needed to prevent damage from condensation runoff on the unit casing.

19. Cabinet insulation is rated for R-2.1 (standard) Nominal ½”. Some jurisdictions require R-4.2 or R-6.0 on installations in a non-conditioned space. Add 1” thick insulation to the exterior casing of the unit to comply in these jurisdictions, putting the vapor barrier on the outside.

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GENERAL INFORMATION

This horizontal fan coil unit provides the flexibility for installation in any horizontal application. The versatile models may be used with or without electric heat. The direct drive (3) speed PSC motor will provide an air volume to match any application.

The unit can be positioned for bottom or air return through the end of the unit in the horizontal position.

NOTE: Refer to the instructions in this manual for the proper downflow conversion kit and instructions on the proper conversion to downflow.

Inspection

As soon as the furnace is received, it should be inspected for possible damage during transit. If damage is evident, the extent of the damage should be noted on the carrier’s freight bill. A separate request for inspection by the carrier’s agent should be made in writing. Before installing the air handler you should check the cabinet for screws or bolts which may have loosened in transit. Some units have blower motor supports over the motor shaft. Remove support before operating the horizontal fan coil unit.

See local Distributor for more information. Mortex Products, Inc assumes no liability for freight damage.

Also check to be sure all accessories such as heater kits, and coils are available. Installation of these accessories should be accomplished before the horizontal fan coil unit is set in place.

Check the connecting of the wiring, electric heater, ducts or piping to make sure there is easy access to the horizontal fan coil unit during the installation.

CASED ENCLOSURE MOUNTING

The installer must adhere strictly to all local and national code requirements pertaining to the installation of

this equipment. These enclosures are designed to be installed in the ceiling for horizontal mounting only.

Location of the unit must be in an area providing adequate access to the ceiling panel since all components

must be serviced from this area.

The enclosure should be lifted to the desired location and secured using the mounting holes located on the top with an acceptable mounting method (Figure 1). The enclosure

must be level in both directions to permit proper drainage of the fan coil.

After the enclosure is mounted a 2x2 or 2x4 frame must be installed around the base of the enclosure to create an air tight seal and support for ceiling panel frame. Figure 1 shows a typical arrangement for the framing required.

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Figure 1: Cased Enclosure Mounting

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CASED ENCLOSURE WITH FAN COIL IS FACTORY MOUNTED “ONLY”

NOTE: Before mounting the enclosure check to see if the fan coil unit is fully engaged into the supply duct flange. Total engagement is when the front of the top plate and the front of the drain pan are squeezing against the insulation. Also check to make certain that the fan coil unit is secured firmly to the enclosure with sheet metal screws through the mounting angle.

Refer to enclosure mounting instructions on page 3.

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UNCASED FAN COIL MOUNTING

It is important to ensure that the fan coils are securely mounted and the structure is sufficient to support the weight of the fsn coil unit. All anchors for mounting the fan coil unit must be placed and sized to ensure a safe and durable installation.

These fan coil units are provided with four (4) mounting slots. Metal washers and nuts of the proper size are to be provided by the installer. If the fan coil unit is not level use shims to obtain proper level. This will ensure that the condensate will drain from the unit.

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Table 1: SEHX General Specifications

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Table 2: CEHX General Specifications

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Table 3 SCWE General Specifications

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Table 4 CCWE General Specifications

Available Blower Motors

1. Standard Blower Motor - – 3 SPD PSC MOTOR

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Table 5: SDXW General Specifications

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Table 6: CDXW General Specifications

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Table 7 SCWW General Specifications

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Table 8 CCWW General Specifications

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Figure 2: CEHX/ CCWE/ CDXW/ CCWW DIMENSIONAL DATA DX OR CHILLER WATER COOLING WITH OR WITHOUT ELECTRIC HEAT

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Table 9: CEHX/ CCWE/ CDXW/ CCWW DIMENSIONAL DATA

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Figure 3: SEHX/ SCWE/ SDXW/ SCWW DIMENSIONAL DATA DX OR CHILLED WATER COOLING WITH OR WITHOUT ELECTRIC HEAT

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Table 10: SEHX/ SCWE/ SDXW/ SCWW DIMENSIONAL DATA

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Table 11: SEHX/CEHX/SCWE/CCWE/SDXW/CDXW/SCWW/CCWW Model Nomenclature

SECTION IlI: CLEARANCE AND RETURN AIR REQUIREMENTS

LOCATION

Access for servicing is an important factor in the location of any fan coil unit. Provide a minimum of 27 inches under the appliance for access to the control box, heating elements, water pump, blower and air filters. The unit can be serviced entirely from the bottom of the unit, including replacing the air filter on models that include a filter rack. These units are NOT designed to be installed in a closet or flush mounted in a wall in an up flow vertical position. The fan coil unit is designed for horizontal application ONLY.

Be sure to route primary and secondary drain connections so as not to obstruct replacement filter.

Location is usually predetermined. Check with owner’s or dealer’s installation plans. If location has not been decided, consider the following in choosing a suitable location.

1. Select a location with adequate structural support, space for service access, clearance for return and supply duct connections. Unit is designed to fit in a 12” high drop down space (Furred-In Area).

2. Where normal operating sound levels may be objectionable if the fan coil is placed directly over or under some rooms such as bedrooms, study, etc.

3. Caution should be taken to locate the fan coil unit so that supply and return air ducts can deliver an even air distribution of supply and return air to and from the living spaces.

4. Locate appliance where electrical supply wiring can be easily routed to main electrical panel and where electrical wiring will not be damaged. Supply power wiring may be installed in a flexible conduit or armored cable. The installer must refer to National Electrical Code (NFPA 70), Canadian Electrical Code, Part I (CSA C22.2), ANSI/NFPA No. 70 and/or any local codes to ensure supply wiring complies with all applicable codes for the location the Horizontal Fan Coil is being installed.

5. Locate appliance where thermostat wiring can be easily routed to the thermostat and where the wiring will not be damaged. Be sure wire has enough length so it will not to block access to any components that may need to be replaced or serviced.

6. Locate appliance where refrigerant lines can be easily routed from the evaporator coil to the condenser.

7. Locate the appliance where condensate lines can be easily routed to an available drain. Be sure to route condensate drain piping so as not to obstruct access to the air filter.

8. When the coil is installed in a blow-thru application it will create a negative pressure situation in the condensate drain system. To prevent condensate from being drawn into the blower it is recommended to trap the primary (Main) and secondary (Overflow) drain line. Refer to CONDENSATE DRAIN SYSTEM and Figure 12 in these instructions.

If the secondary drain is not used, it must be capped.

9. The blow-thru design will cause exterior surface of cabinet to sweat when units is installed in a non-conditioned space such as an attic or garage. Installer must provide protection such as full size auxiliary drain pan on all units installed in a non-conditioned space to prevent damage from condensation runoff.

10. All return air must be filtered to prevent a buildup of dirt on the coil surface.

Appliance Clearances

This appliance is approved for zero (0) inches clearance to combustible material on any part of the air handler exterior casing and the inlet or outlet ducts providing NO electric heater is being used. There is a one (1) inch clearance on the supply plenum and supply air duct when an electric heater is installed in the appliance. Refer to Table 12 for the clearance to combustibles.

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Figure 4: Clearance – Access for Service

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Table 12: Clearance to Combustibles

Un-cased Horizontal Fan Coil Return Air

The uncased fan coil unit can have a non metallic ducted return that can have a return air opening that is located between the joists and the sheet rock that can carry the return air from a return air filter grille in a ceiling to the horizontal fan coil unit.

Provisions shall be made in this type of return air system is large enough to permit the air in the rooms and the living spaces to return to the fan coil unit. Failure to comply may cause a reduction in the amount of return air available to the blower, causing reduced air flow resulting in improper heating of the living space. The reduced air flow may cause the furnace to cycle on the limit causing premature heating element failure.

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The return air grille or duct can never be located in a closet.

Cased Horizontal Fan Coil Return Air

The cased horizontal fan coil unit can use the louvered ceiling access panel on the horizontal fan coil unit as a means of returning the conditioned air from the living space to the fan coil unit.

The cased horizontal fan coil unit can also have a non-louvered ceiling access panel with the return air ducted using a return plenum and duct system. The ducted return air can be located straight down to the ceiling where it is terminated using a return air filter grille The ducted return can also travel through the space between the joists and sheet rock and be terminated with a return air filter grille located away from the horizontal fan coil unit.

Provisions shall be made in the duct system to ensure it is large enough permit the proper amount of air to be returned from the living spaces to the horizontal fan coil unit. Failure to comply may cause a reduction in the amount of return air available to the blower, causing reduced air flow resulting in improper heating of the living space. The reduced air flow may cause the furnace to cycle on the limit causing premature heating element failure.

Air Filter Location

Horizontal Fan Coil Units are not factory equipped with an air filter. The air filter can be installed on the louvered ceiling access panel or the air filters can be located remotely in the return air filter grille.

If a non metallic return system or a ducted return system is installed and a return air filter grille is used at the opposite end of the duct a non-louvered ceiling access panel will be required. The louvered ceiling panel air filter sizes for the SEHX, CEHX, SCWE and the CCWE models are 20” x 20” x 1”

The recommended minimum filter size for a return air filter grille is:

Standard Throw away Air Filter @ 300 ft/min or less

600 CFM = 16 x 20 x 1

700 CFM = 20 x 20 x 1

800 CFM = 20 x 20 x 1

900 CFM = 20 x 24 x 1

1000 CFM = 20 x 24 x 1

Pleated filters are not recommended for use with PSC Motors

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Figure 5: Ceiling Access Panel.

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Table 13: Optional Ceiling Access Panels.

SECTION IV: FAN COIL & SUPPLY AIR DUCT INSTALLATION

CASED FAN COIL SUPPLY DUCT CONNECTIONS:

The horizontal fan coil case can be mounted into the ceiling so there can be a horizontal left supply air flow or a horizontal right supply air flow. The supply plenum is attached and secured to the horizontal fan coil case duct flanges by use of screws. Use a Non-tape sealant such as mastic or an aerosol sealant to seal the plenum to prevent air leakage. The supply plenum must be the same size as the supply air opening.

The supply duct system must be designed as to maintain a 0.20 inches of water static pressure through the entire supply duct system.

The supply air ducts are must be properly sized to carry the proper amount of air from the horizontal fan coil unit to the conditioned spaces. If a hole is to be cut in the supply plenum the hole needs to be the same size as the supply duct(s). Use a duct starting collar to attach the ducts to the plenum. Use a Non-tape sealant such as mastic or an aerosol sealant to seal the plenum to prevent air leakage.

If the cased horizontal fan coil unit installed in a un-conditioned space be sure the supply and return duct system is insulated and installed in accordance with local codes.

UN-CASED FAN COIL SUPPLY DUCT CONNECTIONS:

The horizontal fan coil case can be mounted into the ceiling so there can be a horizontal left supply air flow or a horizontal right supply air flow. The supply plenum is attached and secured to the horizontal fan coil case duct flanges by use of screws. Use a Non-tape sealant such as mastic or an aerosol sealant to seal the plenum to prevent air leakage. The supply plenum must be the same size as the supply air opening.

The supply duct system must be designed as to maintain a 0.20 inches of water static pressure through the entire supply duct system.

The supply air ducts are must be properly sized to carry the proper amount of air from the horizontal fan coil unit to the conditioned spaces. If a hole is to be cut in the supply plenum the hole needs to be the same size as the supply duct(s). Use a duct starting collar to attach the ducts to the plenum. Use a duct starting collar to attach the ducts to the plenum. Use a Non-tape sealant such as mastic or an aerosol sealant to seal the plenum to prevent air leakage.

If the horizontal fan coil unit installed in a un-conditioned space be sure the supply and return duct system is insulated and installed in accordance with local codes.

SECTION V: FAN COIL INSTALLATION

Installing the Fan Coil Unit

Ceiling Installation

If installed in a ceiling, the area in the ceiling where the unit is to be located should have a framed in structure all around the unit so the fan coil unit can be properly mounted and secured. The ceiling must be 12 inches in height. Prior to installing the furnace make sure the holes are cut into the frame for the refrigerant tubing, the drain line, the electrical wiring, the thermostat wiring and the condenser control wiring. Care should be taken to insure unit is level to permit proper condensate drainage.

To properly install the cased horizontal fan coil unit you must do the following:

1. Remove the top shipping cover and corner posts.

2. Remove the bottom shipping cover.

3. Remove the control box access panel.

4. Use screws to secure the four (4) straps to the ceiling where the horizontal fan coil unit will be installed. Be sure the straps are located so the hooks in the straps line up with the slots in the base of the horizontal fan coil unit.

5. Raise the horizontal fan coil unit into the space where it is going to be installed and put the hooks into the slots in the base. Bend the hooks back to keep the hooks from slipping out of the slots in the base.

6. Connect the supply air plenum to the horizontal fan coil unit as described in cased fan coil supply duct connections.

7. If the louvered ceiling access panel is not being used and solid ceiling access panels is being used then, connect the return air plenum to the horizontal fan coil unit as described in cased fan coil return air duct connections.

8. Connect the electrical supply wires and the thermostat control wires in the control box. Be sure to install an ON/OFF switch in the supply circuit to disconnect the power during servicing.

9. Connect the refrigerant lines or chilled water lines to the coil.

10. Re-install the ceiling access panel and control box access panel and secure with the screws that were removed in step 2

11. Turn the power on to the unit by following the procedure in the Users Information Manual.

12. Set the thermostat to the desired temperature.

To properly install the un-cased horizontal fan coil unit you must do the following:

1. Remove the top shipping cover and corner posts.

2. Remove the screws from the control box cover and remove the cover.

3. Remove the bottom shipping cover.

4. Use four (4) lag bolts with washers to go thru the slots in the top cover that secure the horizontal fan coil unit to the ceiling where the horizontal fan coil unit will be installed.

5. Raise the horizontal fan coil unit into the space where it is going to be installed and install the lag bolts thru the slots in the top cover. Tighten the lag bolts until the horizontal fan coil unit is securely fastened to the ceiling.

6. Connect the supply air plenum to the horizontal fan coil unit as described in cased fan coil supply duct connections.

7. Connect the electrical supply wires and the thermostat control wires in the control box. Be sure to install a ON/OFF switch in the supply circuit to disconnect the power during servicing.

8. Connect the refrigerant lines or chilled water lines to the coil.

9. Install the control box access panel and secure with the screws that were removed in Step 2.

10. Install the ceiling access panel and secure to the ceiling frame with the thumb screws.

NOTE: Ceiling Access Panel is shipped separately. It is not included with the Fan Coil Unit.

11. Turn the power on to the unit by following the procedure in the Users Information Manual.

12. Set the thermostat to the desired temperature.

SECTION VI: COOLING AND REFRIGERANT PIPING

DX Cooling / Chilled Water Cooling

DX Refrigerant Piping:

Horizontal Fan Coil Units with DX type evaporator coils require liquid and suction piping sized in accordance with condensing unit manufacturer’s instructions. The evaporator coils have sweat copper connections. Refrigerant lines should be soldered with silver solder or high temperature brazing alloy. Suction line must be insulated to avoid condensate from forming and dropping off. Armaflex (or equivalent) with 3/8” (1 cm) minimum wall thickness is recommended. In severe conditions such as hot or high humidity areas require 1/2” (1.3 cm) minimum wall thickness may be required. If condensing unit is installed above evaporator coil then oil traps are required at equal intervals along suction line (see Figure 6). Horizontal suction lines should slope 1 inch for every 20 feet toward condensing unit. Manufacturer recommends that dry nitrogen be flowed through refrigerant lines during soldering operation.

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Figure 6 Evaporator Below Condenser Piping

SPECIAL INSTRUCTIONS FOR COILS WITH

THERMAL EXPANSION VALVES (TXV)

Thermal expansion valve (TXV) have a built in check valve making them A/C and heat pump capable. Hard start kit may be required on non-bleed TXV’s. The external equalizer line attached to the TXV has a female flare nut with built in Schrader valve depressor that attaches to the Schrader valve port provided on coils.

A thermostatic expansion valve (TXV) is built around a thermostatic element separated from the valve body by a diaphragm. It’s purpose is to regulate the rate at which refrigerant flows into the evaporator.

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Figure 7: The TXV Bulb Best Placement

The bulb is best mounted on a horizontal suction line tube and in a position corresponding to between 1 o'clock and 4 o'clock.

The location depends on the outside diameter of the tube. (Figure 7).

Note: The bulb must never be located at the bottom of the suction line due to the possibility of oil laying in the bottom of the pipe causing false signals.

The bulb must be able to sense the temperature of the superheated suction vapor and must therefore not be located in a position that will expose it to extraneous heat/cold.

Be sure that the expansion valve provided is the proper size and type required to achieve rating. If a non-bleed type valve is to be used, the outdoor unit must be equipped with a hard start kit allowing the outdoor unit to start under load. Check with our factory if necessary.

How the TXV Controls Superheat

The thermostatic expansion valve (TXV) is a precision device designed to regulate the rate at which liquid refrigerant flows into the evaporator. This controlled flow is necessary to prevent the return of liquid refrigerant to the compressor.

The TXV separates the high pressure and low-pressure sides of a refrigeration or air conditioning system. Liquid refrigerant enters the valve under high pressure, but its pressure is reduced when the TXV limits the amount of refrigerant entering the evaporator.

Remember: the TXV controls only one thing: the rate of flow of liquid refrigerant into the evaporator. The TXV is not designed to control air temperature, head pressure, capacity, suction pressure, or humidity. Attempts to use the TXV to control any of these system variables will lead to poor system performance and possible compressor failure.

The TXV responds to the temperature of refrigerant gas as it leaves the evaporator. This temperature is detected by the sensing bulb, which is located near the evaporator outlet. The TXV also responds to the refrigerant pressure within the evaporator, which is transmitted to the TXV by an equalizer line. By responding to these variables, the TXV maintains a predetermined superheat within the evaporator. This is how the TXV keeps the system in balance and operating properly. To understand how this works, we must have a clear understanding of superheat.

The TXV controls superheat by controlling the flow of liquid refrigerant. As it does this, it also reduces refrigerant pressure. Liquid refrigerant enters the TXV under high pressure. As the flow of liquid refrigerant is reduced, its pressure drops. The refrigerant leaving the TXV is now a combination of low-pressure liquid and vapor.

As the flow is restricted, several things happen:

• The pressure on the liquid refrigerant drops;

• A small amount of the liquid refrigerant is converted to gas, in response to the drop in pressure;

• This "flash gas" represents a high degree of energy transfer, as the sensible heat of the refrigerant is converted to latent heat;

• The low-pressure liquid and vapor combination moves into the evaporator, where the rest of the liquid refrigerant "boils off" into its gaseous state as it absorbs heat from its surroundings.

Changes in gas temperature at the evaporator outlet are detected by the sensing bulb, which then causes the valve pin to move in or out, regulating the flow of refrigerant through the TXV. In this way, the valve allows just enough refrigerant into the evaporator, to maintain the correct level of superheat in the suction line.

The TXV controls superheat by varying the size of the orifice through which the refrigerant flows. The pin angle, the size of the stroke (typically 0.015- to 0.035-in.) and the diameter of the orifice itself all affect how much refrigerant can pass through the valve. In addition, all valves have some leakage around the valve pin, although this is normally kept within acceptable limits.

It's important to remember that valve capacity is a function of the orifice diameter, pin angle, and stroke. Adjusting the superheat spring doesn't change valve capacity.

Trouble Shooting:

The thermostatic expansion valve (TXV) is like the carburetor in your car's engine. It opens and closes to allow the correct amount of refrigerant into your system. When the TXV isn't working properly, the efficiency of your unit is crippled. If you suspect you have a faulty TXV, perform these tests:

First, connect your gauges to the system and check that the refrigerant pressures, subcooling and superheat are where they should be (for pressures settings, refer to unit's pressure chart; for subcooling (usually around 10°F) and superheat (between 8°F-12°F) follow manufacturer's specification sheet.

Check to see if airflow through the system is good . There should be no dirty coils or air filters. Also check for proper CFMs readings across the system.

Make sure there's the right amount of refrigerant charge in the system (this step may require weighing out the refrigerant in the system). Once you've added or removed charge as necessary, check the pressures, subcooling and superheat again. If there is no change then it is probably the TXV.

Check the evaporator coil and remove the TXV's sensing bulb from the suction line.

Check the subcooling, superheat and pressures again. If there's no change, that's a further indication of a TXV problem. Another test is to put the sensing bulb in ice water and checking the pressures, superheat, and subcooling again. If they don't change, it's a bad TXV.

When a non-bleed expansion valve (TXV) is specified in a Summit AC or HP Rating, the following assumptions are made:

a) The TXV is a field or factory installed accessory to be field or factory installed in accordance with recommended TXV practice.

b) The combination of this non-bleed valve and the compressor in the outdoor unit results in a system that operates with a loaded condition on startup.

c) The outdoor unit is capable of starting against this loaded condition or a hard start kit is to be field installed.

APPLICATION DATA:

R72DB0005 (R-22) 15% Bleed Non-Adjustable - 1.5-3.0 Ton “T” Valve Letter Code

R72DB0003 (R-410A) 15%-Bleed Non-Adjustable-1.5–2.5 Ton “D” Valve Letter Code

R72DB0004 (R-410A) 15%-Bleed Non-Adjustable-3.0–5.0 Ton “Y” Valve Letter Code

Inlet Fitting Male Rotalock / Outlet Fitting Female swivel nut.

R72DB0006 (R-22) 15% Bleed Non-Adjustable - 3.0-5.0 Ton “X” Valve Letter Code

R72DB0044 (R-410A) Non-Bleed Adjustable - 3.0-6.0 Ton

“Z” Valve Letter Code

Inlet Fitting Male Rotalock / Outlet Fitting Female swivel nut.

TXV TROUBLE SHOOTING:

Changing parts might be the first reaction, BUT…

1. May not be necessary and…

2. Does not always solve the problem.

SUPERHEAT AND SUCTION PRESSURE

LOW SUCTION PRESSURE – HIGH SUPERHEAT

POSSIBLE CAUSES:

1. Undersized valve

2. High superheat adjustment

3. Evaporator pressure drop – no external equalizer

4. External equalizer location – needs to be located on suction line after the last feeder tube.

5. Restricted or capped external equalizer

6. Low refrigerant charge

7. Plugged dryer or strainer

8. Low pressure drop across valve:

a. Plugged dryer or strainer

b. Low condensing temperature

HIGH SUCTION PRESSURE – LOW SUPERHEAT

POSSIBLE CAUSES:

1. Oversized valve

2. TXV seat leak

3. Low superheat adjustment

4. Bulb installation:

a. Poor thermal contact

b. Warm location

5. Bad compressor – low capacity

6. Incorrectly located external equalizer line – needs to be located on suction line after the last feeder tube.

LOW SUCTION PRESSURE – LOW SUPERHEAT

POSSIBLE CAUSES:

1. Low load:

a. Not enough air

b. Dirty air filters

c. Air too cold

d. Coil icing or frosting

2. Poor air distribution

3. Improper compressor evaporator balance – coil too big or small or incorrect balance on heat pump systems.

4. Oil is trapped in the evaporator

Check these things before removing the TXV

1. Remove the sensing bulb and hold in your hand. The high side pressure should drop and low side pressure should increase as the TXV opens.

2. Loosen the flare nut on the TXV external equalizer tube that is connected with a flare nut on the suction line. If you get a lot of pressure when the nut has been loosened then tighten the nut. If you get a slight pressure or no pressure; the Schrader valve stem is not being depressed. Install a anti blow back fitting to the external equalizer line of the TXV to depress the Schrader valve stem and check for proper operation of the TXV.

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Figure 8: TXV Sensing Bulb Location

INSTALLATION NOTES:

With reference to the Figure 8, the TXV assembly is to be installed between the distributor and the existing liquid line

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Field Installed :

1. After coil pressure has been relieved, turn the female swivel nut counter-clockwise to remove.

2. If Flowrator Distributor Assembly is being replaced by a TXV, remove the piston orifice from the flowrator distributor assembly using a small diameter wire or paper clip.

3. Attach the TXV by connecting the female swivel nut on TXV outlet to the flowrator distributor (aligning Teflon seal first) and torque swivel nut to 10-30 ft. lbs.

4. Attach liquid line with female swivel nut to male rotalock fitting on TXV inlet (Aligning Teflon seal first) and torque swivel nut to 10-30 ft. lbs.

5. Remove the cap on Schrader valve port on coil manifold. Attach equalizer tubing with 1/4” female flare nut that includes depressor to this male Schrader port. Torque nut to 10-30 ft. lb

6. Install the TXV bulb to the suction manifold of coil or the suction line using the two bulb clamps furnished with kit.

a. Bulb should be installed on a horizontal run of the manifold if possible. On line less than 7/8” OD the bulb may be installed on top of the line. With 7/8” OD and over, the bulb should be installed in a position at about 4 or 8 o’clock.

b. If bulb installation is made on a vertical run, the bulb should be located at least 6 inches from any bend, and on the tubing side opposite the plane of the bend. On vertical bulb installations, the bulb should be positioned with the bulb capillary tube at the top.

c. The bulb should be insulated using thermal insulation to protect it from the effect of the surrounding ambient temperature.

7. After completing installation of TXV (including equalizer tube), it will be necessary to leak check the coil and evacuate the coil through the service access fittings of liquid and suction line valves.

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Figure 9 Typical TXV Connections

SPECIAL INSTRUCTIONS FOR COILS WITH

FLOWRATOR DISTRIBUTOR ASSEMBLIES

The sizing of the orifice piston should be based strictly on the rated capacity of the outdoor unit and coil match.

Summit provides capacity performance ratings that match both same size and upsized coils with specific manufacturer’s outdoor units. At the Summit distributor’s request, the orifice piston is selected and installed in each coil for the specific range of cooling capacities likely to be encountered. The factory installed orifice piston size is marked on the flowrator distributor assembly and on the front of the coil carton.

When using this coil with an outdoor unit of another capacity, select an orifice piston from the table below if the capacity range for the coil and outdoor unit to be used differs.

Failure to install the proper orifice piston can lead to poor system performance and possible compressor damage. A variation of one piston size is not normally critical. Summit reserves the right to substitute a factory installed piston one size smaller or greater if the piston size ordered is out of stock.

A selection of replacement orifice pistons is available from your Summit supplier.

FLOWRATOR TO TXV CONVERSION:

While thermal expansion valves can be factory installed, they are normally available in kit form for field installation. For kit version, follow the installation instructions provided with the kit. Normally these can be field installed before system is charges without requiring cutting and brazing. BE SURE FLOWRATER PISTON HAS BEEN REMOVED FROM THE FLOWRATER DISTRIBUTOR BODY PRIOR TO INSTALLATION OF EXPANSION VALVE.

ORIFICE PISTON REPLACEMENT:

If the flowrator distributor assembly is being used the piston is to be installed as shown in Figure 10 in the distributor body then the existing liquid line attached to the flowrator distributor.

1. After coil pressure has been relieved, turn the female swivel nut counter-clockwise to remove.

2. Remove the piston from the flowrator distributor fitting using a small diameter wire or paper clip. ALWAYS REMOVE PISTON FROM DISTRIBUTOR BODY WHEN TXV IS INSTALLED).

3. Replace the orifice piston with the correct piston for the coil you are using. Make sure the tapered end of the piston is facing the feeder tubes on the distributor body.

4. Turn the female swivel nut on clockwise the flowrator distributor (aligning Teflon seal first) and torque swivel nut to 10-30 ft. lbs.

5. After completing the replacement of the orifice piston, it will be necessary to leak check the coil and evacuate the coil through the service access fittings of liquid and suction line valves.

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Figure 10: Flowrator Distributor

FIELD INSTALLED SUPPLEMENTAL HEAT LOCKOUT (SHL) KIT:

Field Installed SHL is to be used with model SEHX and CEHX models with factory installed electric heat used with a heat pump system. The temperature switch is to prevent excessive refrigerant liquid pressures due to the evaporator coil being located after the electric heaters. If the electric heater is energized while the heat pump is operating in the heat mode, the added heat that the evaporator coil will see will cause the refrigerant liquid pressures to be excessively high. The SHL temperature switch will lock out the electric heat until the refrigerant liquid temperature falls to approximately 109°F causing the switch to close. The switch resets (opens) at approximately 120°F.

INSTALLATION:

Use the insulation tape that is provided in the kit. Wrap sensor on liquid line and secure with the plastic ties that are provided in the kit, refer to Figure 11. After the brazing and leak testing of the refrigerant lines is complete and the lines have cooled off mount the temperature switch to the liquid line assuring temperature switch has good contact with the liquid line and not located where it may be damaged.

WIRING:

One of the pigtail leads are connected in series to the white pigtail wire on the unit, refer to Figure 12. Secure the wires with a wire nut. The other pigtail lead is connected to the white thermostat wire and secured with a wire nut. This wiring prevents the electric heaters from energizing until the SHL switch closes. Check outdoor unit and thermostat diagrams to assure the SHL will prevent the supplemental electric heat from being energized.

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Figure 11: Proper Mounting of the SHL Temperature Switch

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Figure 12: Proper Wiring of the SHL Temperature Switch

SHL Switch Location

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Figure 13 Heat Pump Heating Cycle. SHL switch is secured to the 3/4” or 7/8” pipe next to the evaporator.

SHL Switch Location

[pic] Figure 14 Heat Pump Cooling Cycle. SHL switch is secured to the 3/4” or 7/8” pipe next to the evaporator.

CONDENSATE DRAIN PIPING:

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The horizontal fan coil cooling DX coil condensate drain pan has one ¾” NPT female primary and one ¾” NPT female secondary connection is on the same side as the refrigerant connections. The other side of the condensate drain pan is one ¾” NPT female primary drain connection and no secondary drain connections. Refer to figure 12 for drain locations.

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Figure 15: Condensate Drain Pan

Piping from each fitting used is to have 1-1/2 minimum trap and each run in such a manner as to provide enough slope for adequate drainage to a visible area. Do not pipe these two fittings together into a common drain. Cap unused connection.

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Figure 16: Typical Condensate Traps

SECTION VII: HOT AND CHILLER WATER

Water Piping

All piping must be supported independent of coils to prevent vibration and stress on coil headers. Swing joints or flexible fittings must be provided to absorb expansion and contraction strains. Rigid piping reduces the effectiveness of vibration isolators. Coil water pipes must be adequately vented in order to prevent air binding. Units are provided with manual air vents mounted on coil manifold.

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Total hot water piping should not exceed 140 feet. All hot water piping to the coil should be 3/4 inch ID (7/8 inch OD) copper. CPVC piping may be used in applications where the water temperature does not exceed 150°F. It is recommended a water isolation valve and a union be placed in the water lines to and from the coil, near the coil, for serviceability, repair or replacement of the coil.

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After piping has been installed, allow the system to fill with water and check connections for leaks. To insure complete filling of the system, follow start-up procedure.

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A thermal expansion tank is recommended on any closed loop system to relieve thermal expansion due to pressure increase.

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Figure 17: Components and Water Connections

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Table 14: SCWE/CCWE Hot Water Capacity 18-30 BTU/H Models

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Table 15 SCWE/CCWE Hot Water Capacity 31-37 BTU/H Models

Chilled Water Piping:

Supply and return chilled water piping to the coil should be ¾ inch ID up to 42,000 BTU’s, 1 inch on units greater than 42,000 BTU’s. Water piping must always be connected so that the entering water is on the leaving side of the coil.

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Table 16: SCWE/CCWE/SCWW/CCWW Chilled Water Capacity 18-30 BTU/H Models

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Table 17: SCWE/CCWE/SCWW/CCWW Chilled Water Capacity 31-37 BTU/H Models

SECTION VIII: LINE VOLTAGE WIRING

Power Supply Wiring

The unit internal wiring is complete except for the power supply and the thermostat wires. See wiring diagram and/or Tables 18-20 for wire size, fuse/circuit breaker size, and ground wire sizes. The use of cable connectors on incoming power supply wires to relieve any strain on wiring is recommended. Follow the steps below to connect the power supply wires.

Line Wiring Connections

1. Remove the thumb screws that secure Ceiling Access Panel and slowly swing the panel down to access the fan coil unit.

2. Remove the screws that secure the control box access panel, and then remove the access panel.

3. Install the cable connectors on the 7/8” dia hole on the bottom right side of the control box.

4. Strip ½” of the insulation on the end of each wire.

5. Insert the wires through the cable connector located in the 7/8” diameter hole in the fan coil control box flange.

6. The supply power wires are connected to the two (2) pole terminal block or pigtails located on the right side of the control box.

7. Insert the black wire into the L1 screw terminal on the two (2) pole terminal block and tighten the set screw to clamp down on the wire.

8. Insert the white or red wire into the L2 screw terminal on the two (2) pole terminal block and tighten the set screw to clamp down on the wire.

9. Insert the green wire into the ground lug and tighten the set screw.

General wire and breaker sizes are shown in Tables 18-20. If sheathed cable is used, refer to NEC National Electrical Code (NFPA 70) or the Canadian Electrical Code, Part I (CSA C22.1) and local codes for additional requirements concerning supply circuit wiring. Electrical data can be found in Tables 18-20.

IMPORTANT - All installation on field wiring must be rated at 60ºC or higher. Please refer to the wiring diagrams on the furnace or the tables this manual for more information.

Refer to the NEC National Electrical Code (NFPA 70) or the Canadian Electrical Code, Part I (CSA C22.1) and local codes for wiring material requirements.

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Table 18: Wiring Requirements – 208/230 VAC Electric Heat 18-37 kBTU Models

+ Refer to the National Electrical Code Table 250-95 for Non-Sheathed Conductor Ground Wire.

* Ground conductor must be the same size and temperature rating as the other conductors listed in Table 18.

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Table 19: Wiring Requirements – 120 VAC Hot Water Heat 18-37 kBTU Models

+ Refer to the National Electrical Code Table 250-95 for Non-Sheathed Conductor Ground Wire.

* Ground conductor must be the same size and temperature rating as the other conductors listed in Table 19.

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Table 20: Electric Heater Electrical Data

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Figure 18: Component Locations – Electric Heat Control Box

Casing or cabinet must be permanently grounded in accordance with the National Electrical Code or other applicable codes.

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Figure 19: Component Locations – No Heat Control Box

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Figure 20: Component Locations – Hydronic Heat Control Box

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SECTION IX: THERMOSTAT WIRING AND CONNECTIONS

Thermostat Wiring

Thermostat wires connect through side of furnace and should be no smaller than 22 gauge. Refer to Table 21 for recommended wire gauge, lengths and maximum current for each wire gauge.

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Table 21: Low Voltage Wire Gauge and Max Lengths

Thermostat wires can enter through the side of the unit.

When bringing wiring through the side of the fan coil unit, cable connectors must be installed to hold wiring in place and to relieve any strain on the wiring.

The use of a five-conductor cable from the thermostat to the furnace is recommended for typical heating or heating/cooling installations with a two or three-conductor cable from the furnace to the condenser. The thermostat wire colors and the typical heating/cooling connections are listed in Tables 23 and 24.

A seven-conductor cable from the thermostat to the furnace is recommended for a typical heat pump installation with a five-conductor cable from the furnace to the condenser.

The thermostat wire colors and the typical heat pump heating/cooling connections are listed in Table 25.

Thermostat Installation

The thermostat heat anticipator must be-set at 0.4 Amps if the thermostat has a manual heat anticipator adjustment. This setting should be checked at the time of installation.

The thermostat may be a “self-setting" type in which case no heat anticipator setting will be found on the thermostat, eliminating the need for any field adjustment.

Thermostat should be located on an inside wall in an open area to more closely regulate average room air, preferably, where there is air movement back to furnace. Locating height of thermostat is important. Thermostat should be located preferably in a hallway upstream from the furnace return airflow, not within three feet of from any windows and 52 to 66 inches above the floor.

DO NOT place the thermostat within three feet of any of the furnace supply air registers

DO NOT place the thermostat within three feet of any of the air conditioner supply air registers

Maintenance, operating and/or programming instructions are in the envelope accompanying the thermostat. Give the envelope to the home owner.

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Separate Heating and Cooling System; Same Thermostat

If the furnace and the cooling unit have separate transformers be sure to use a thermostat with isolated heating and cooling contacts “RC” and “RH” to prevent interconnection of Class II 24 Volt Systems. Cycle furnace and the air conditioner separately to make sure it will operate correctly.

Most new thermostats have separate heating and cooling contacts for use with homes that have a air handler and air conditioner that are completely separate and each have a 24 VAC transformer for system control. These thermostats have a “RC” terminal for cooling and a “RH” terminal for heating. Connect the cooling unit red wire from the “R” terminal on the outdoor unit to the “RC” terminal on the thermostat and the RED air handler pigtail wire to the “RH” terminal on the thermostat. Refer to Figures 21 - 28 for typical low voltage wire connections.

If you have separate furnace and air conditioner with separate transformers and your thermostat does not have the “RC” and “RH” terminals it is recommended that you purchase a new thermostat. If the furnace and air conditioner are both connected to the thermostat “R” terminal it can cause transformer burnout or it can cause either the furnace or air conditioner control system to go into lockout.

Separate Heating and Cooling Units, Separate Thermostats

If the heating/cooling system in your house is a central heating and cooling system but, the furnace and the cooling unit are controlled by separate thermostats, then the use of a thermostat interlock switch is required in order to prevent the furnace and the air conditioner from operating at the same time.

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Figure 21: Separate Thermostats; Separate Fan Coil and Cooling Unit

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Figure 22: Separate Thermostats; Separate Transformers, Separate Fan Coil and Cooling Unit

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Figure 23: Same Thermostat; Separate Fan Coil and Cooling Unit with separate transformers

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Figure 24: Same Thermostat; Separate Fan Coil and Cooling Unit with sane transformer

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Figure 25: Honeywell T9611 Heat Pump Thermostat Connections

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Table 22: White Rodgers Thermostat Terminal Designations

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Figure 26: White Rodgers Multistage Heating / Cooling Thermostat Connections

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Figure 27: White Rodgers multistage heating / cooling thermostat connections with a two transformers. Remove RH and RC jumper wire when two transformers are being used.

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Figure 28: White Rodgers Heating / Cooling / Heat Pump Thermostat Connections with a Transformer on Cooling Unit and a Transformer on Heating Unit.

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Table 23: Typical Fan Coil Unit Thermostat Pigtail Wire Colors and Connections.

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Table 24: Typical Cooling Unit Thermostat Wire Color Codes and Connections.

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Table 25: Typical Heat Pump Thermostat Wire Color Codes and Connections.

Typical Heating/ Cooling Wiring Connections

1. Remove the ceiling access panel.

2. Remove the control box cover.

3. Install a grommet or a strain relief in the 9/16” diameter hole on the top and the left side of the fan coil unit to protect the thermostat wire cable.

4. Strip ½” of the insulation on the end of each wire.

5. Insert the wire cable from the thermostat thru the 9/16” hole into the control box and place the thermostat wire cable next to the low voltage pigtails. Secure the thermostat wire cable with a strain relief to prevent wire connections from being pulled apart.

6. Connect the Red (24 VAC) supply thermostat wire to the Red low voltage pigtail wire and secure with a wire nut.

7. Connect the White (First stage heating) thermostat wire to the White low voltage pigtail wire and secure with a wire nut.

8. Connect the Green (Indoor fan) thermostat wire to the Green low voltage pigtail wire and secure with a wire nut.

9. Connect the Yellow (Air conditioning) wire from the thermostat to the compressor contactor on the condenser unit.

10. Connect the brown (24 VAC Common) wire from the thermostat with the yellow low voltage pigtail wire on the fan coil unit and with the brown (Common) wire from the compressor contactor on the outdoor unit. Fasten the three wires together securely with a wire nut.

Typical Heat Pump/Heating/Cooling Wiring Connections

1. Remove the ceiling access panel.

2. Remove the control box cover.

3. Install a grommet or a strain relief in the 9/16” diameter hole on the top and the left side of the fan coil unit to protect the thermostat wire cable.

4. Strip ½” of the insulation on the end of each wire.

5. Insert the wire cable from the thermostat thru the 9/16” hole into the control box and place the thermostat wire cable next to the low voltage pigtails. Secure the thermostat wire cable with a strain relief to prevent wire connections from being pulled apart.

6. Connect the Red (24 VAC) supply wire from the thermostat to the Red low voltage pigtail wire on the air handler and with the Red wire from the “R” terminal on the outdoor unit. Fasten the three wires together securely with a wire nut.

7. Connect the White (first stage heating) wire from the thermostat to the White low voltage pigtail wire on the air handler and the White wire from the “E” terminal on the outdoor unit. Fasten the three wires together securely with a wire nut.

8. Connect the Green (indoor fan) wire from the thermostat to the Green low voltage pigtail wire on the air handler and securely fasten the two wires together with a wire nut.

9. Connect the Red wire from the “Y” terminal on the outdoor unit. Fasten the three wires together securely with a wire nut.

10. Connect the Yellow (Air conditioning) wire from the thermostat to the compressor contactor on the condenser unit.

11. Connect the brown (24 VAC Common) wire from the thermostat with the yellow low voltage pigtail wire on the fan coil and with the brown (Common) wire from the “C” terminal on the outdoor unit. Fasten the three wires together securely with a wire nut.

12. Connect the Orange (Reversing Valve Solenoid) wire from the thermostat with the Orange wire from the “O” terminal on the condenser unit. Fasten the two wires together securely with a wire nut.

SECTION X: MOTOR, BLOWER AND FAN COIL STARTUP

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Change Motor Speeds - PSC Motor

1. Turn off all electrical supply circuits to the fan coil unit at the main service (House Circuit Breaker) panel.

2. Remove the screws from the ceiling access panel and open the panel to get access to the control box.

3. Remove the screws that secure the control box cover to the fan coil unit then, remove the cover.

4. Disconnect the wire from the isolation relay terminal and reconnect the desired wire to the terminal.

Here is the PSC motor speed tap wire color code:

Black wire is High Speed, Blue wire is Medium Speed, and Red wire is Low Speed. Brown wires for capacitor.

5. Reinstall control box cover and secure the cover with the screws that were removed.

6. Close the ceiling access panel and secure with the screws that were removed.

7. Turn on all electrical supply circuits to the fan coil unit at the main service (House Circuit Breaker) panel.

8. Set the thermostat to the desired temperature.

Replacing the Blower Motor

1. Turn off all electrical supply circuits to the fan coil unit at the main service panel.

2. Open the ceiling access panel by removing the thumb screws.

3. Remove the four (4) screws that secure the motor guard to the control box.

4. Remove the control box cover by removing the two (2) screws that are securing the cover to the fan coil unit.

5. Disconnect the blower motor power wires from the relay and the terminal block.

6. Remove the strain relief that is securing the wires to the control box and remove the blower motor wires from the control box.

7. Remove the two screws on the blower mount plate located on the right side, the left side, the screw on the top center and the screw in the control box. Refer to Figure 29 for screw locations.

[pic]

Figure 29: PSC Blower Assembly

8. Grab the blowers and lift the panel up and pull out on the bottom. Slide the panel down and out of the fan coil chassis.

9. Rotate the blower housing so you are looking at the wheel from the discharge of the blower. Use a hex key to loosen the set screws that secure the blower wheels to the motor shaft.

10. Remove the screws that secure the both blower housings to the blower mount plate.

11. Remove the blower motor from the mount bracket by placing a straight edge screw driver on the “U” shaped part of the clip. Push the clip down and away from the bracket to pop the clip off the bracket.

12. After both motor mount retaining clips have been removed; the motor it can be removed the motor mount plate.

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Figure 30: Blower Motor Retainer Clips

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Figure 31: Blower Housing

13. Remove both of the blower housings by sliding the blower wheels “off” the motor shaft.

14. Replace both of the blower housings by sliding the blower wheels “on” the motor shaft.

15. Set the new blower motor on the mount bracket. Place one end of the retaining clip into the notch on the motor mount bracket. Use a straight edge screw driver and a mallet on the “U” shaped part of the retaining clip to push the clip down and into the notch on the other side of the bracket.

16. Set the blower housing in the correct position on the blower mount plate and secure the blower housings with the screws that were removed.

17. Rotate the blower housing so you are looking at the wheel from the discharge of the blower. Center the blower wheels in the housing then use a hex key to tighten the set screws and secure the blower wheels to the motor shaft.

18. Grab the blowers and lift the panel up, push in on the bottom, then pull down to set the blower mount plate in place.

19. Replace the two screws on the blower mount plate located on the right side, the left side, the screw on the top center and the screw in the control box. Refer to Figure 23 for screw locations.

20. Place the motor wires into the control box and replace the strain relief that is securing the wires to the control box.

21. Reconnect the blower motor power wires from the relay and the terminal block.

22. Replace the control box cover and secure with the screws that were removed.

23. Close the ceiling access panel and secure the panel with the thumb screws that were removed.

24. Turn on all electrical supply circuits to the fan coil unit at the main service (House Circuit Breaker) panel.

25. Set the thermostat to the desired temperature.

SECTION XI: FINAL SYSTEM CHECKOUT

1. Refer to appropriate wiring diagram and recheck all wiring connections. Ensure that all wiring connections are tight.

2. Check blower motor connectors to make sure they are not damaged or loose.

3. If the control box cover was removed; reinstall control box cover.

4. Switch circuit breaker(s) to “ON” position.

5. Switch the furnace circuit breakers in the main service (House Circuit Breaker) panel to the ON position.

6. Set the blower selector switch to the ON position and check all of the duct connections for air leaks. Seal any air leaks found.

7. Set the blower selector switch to the AUTO position.

8. Set the thermostat above the room temperature to check for proper operation of the electric heaters.

9. Set the thermostat to the desired temperature.

Thermostat Heat Anticipator

Some thermostats have a heat anticipator setting that must be set to the settings shown below in order to function correctly. If the heat anticipator setting is too low the furnace will short cycle. If the heat anticipator setting is too high the furnace will run long cycles thus causing the temperature to overrun the temperature setting. This will cause the home owner to feel hot by the time the blower completes its cycle; then cold, by the time the furnace cycles on again.

The heat anticipator should be set to the following settings.

For 3kW, 5kW, 6kW, 8kW and 10kW Models Set at 0.4

SECTION XII: WIRING DIAGRAMS

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Figure 32: SEHX, CEHX, SCWE, CCWE 12 – 37 – 03kW to 10kW Electric Heat – PSC Blower Motor w/ Dehumidification Circuit

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Figure 33 SEHX, CEHX, SCWE, CCWE 12 – 37 – 03kW to 10kW Electric Heat – PSC Blower Motor

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Figure 34 SEHX, CEHX, SCWE, CCWE 12 – 37 – 03kW to 10kW Electric Heat – PSC Blower Motor w/ Field Installed Electric Heat Lockout Switch

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Figure 35 SDXW, CDXW, SCWW, CCWW - 12 – 37 – Hydronic Heat – PSC Blower Motor

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Figure 36 SDXW, CDXW, SCWW, CCWW - 12 – 37 – Hydronic Heat – PSC Blower Motor w/ Freeze Sensor

Subject to change without notice 61BA0067C

Copyright by Mortex Products Inc. 2017. Supersedes:

®

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Improper installation may create a condition where the operation of the product could cause personal injury or property damage.

Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer to this manual for assistance; or for additional information consult a qualified contractor, installer, or service agency.

FIRE OR ELECTRICAL HAZARD

Failure to follow the safety warnings exactly could result in serious injury, death, or property damage.

A fire or electrical hazard may result causing property damage, personal injury or loss of life.

This product must be installed in strict compliance with the installation instructions and any applicable local, state, and national codes including, but not limited to; building, electrical, and mechanical codes.

The Clean Air Act of 1990 bans the intentional venting of refrigerant (CFC's and HFC's) as of July 1, 1992. Approved methods of reclaiming must be followed. Fines and/or incarceration may be levied for non-compliance

ALWAYS SHUT OFF ELECTRICITY AT THE DISCONNECT SWITCH OR TURN OFF THE CIRCUIT BREAKERS IN THE MAIN ELECTRICAL ENTRANCE BEFORE PREFORMING ANY SERVICE ON THE APPLIANCE.

Extreme caution must be taken that no internal damage will result if screws or holes are drilled into the cabinet.

It is recommended that the enclosure and fan coil be protected (covered) during the dry wall and painting process to prevent the spraying of the material into the enclosure and on the fan coil.

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NON METALIC DUCTED RETURN SYSTEMS MAY NOT BE ALLOWED IN SOME STATES, COUNTIES, OR CITIES.

CHECK ALL STATE, LOCAL AND FIRE CODES TO DETERMINE IF THIS TYPE OF RETURN SYSTEM IS ALLOWED WHERE THE HORIZONTAL FAN COIL UNIT IS BEING INSTALLED.

FIRE HAZARD:

NON METALIC DUCTED RETURN SYSTEMS WILL COLLECT DUST AND DEBRIS WHICH CAN RESULT IN A FIRE HAZARD. BE SURE TO THOROUGHLY CLEAN THIS SYSTEM TO REMOVE ALL DUST AND DEBRIS ANNUALLY.

USING THE LOUVERED CEILING ACCESS PANEL FOR AIR RETURN WILL RESULT IN A VERY LOUD AND NOISY SITUATION.WHEN THE FAN COIL UNIT IS OPERATING.

USING A DUCTED RETURN WILL RESULT IN A MUCH QUITEIER SITUATION WHEN THE FAN COIL UNIT IS OPERATING.

IMPACT HAZARD

Use extreme caution when removing the Ceiling Access Panel screws. The panel is secured to the frame assembly with the thumb screws. Once the thumb screws have been removed the Ceiling Access Panel will swing down very quickly. Anyone that standing under the Ceiling Access Panel will get hit with the panel unless the panel is supported by holding it with their hands.

The louvers can also have sharp edges which can cut hands or fingers. The use of gloves is recommended when servicing the horizontal fan coil unit.

Coil is pressurized with nitrogen. Relieve pressure before installing TXV by depressing Schrader valve on coil manifold.

Horizontal Fan Coil Unit must be located so that if any connections should leak, water will not cause damage to the adjacent area.

When such locations can’t be avoided, a suitable drain pan should be installed under the air handler, not over 1-1/2” deep, with minimum length and width at least 2” greater than the air handler dimensions and connected to an adequate drain.

Under no circumstances is the manufacturer to be held liable for any water damage in connection with this Horizontal Fan Coil Unit.

Horizontal Fan Coil Unit must be located so that if any connections should leak, water will not cause damage to the adjacent area.

When such locations can’t be avoided, a suitable drain pan should be installed under the air handler, not over 1-1/2” deep, with minimum length and width at least 2” greater than the air handler dimensions and connected to an adequate drain.

Under no circumstances is the manufacturer to be held liable for any water damage in connection with this horizontal fan coil unit.

Toxic chemicals used for treatment of boilers or non-potable water heating appliances shall never be introduced into a potable water space heating system.

When system requires water at temperatures higher than required for other uses, a means such as a mixing valve shall be installed to temper the water for those uses in order to reduce the scald hazard potential.

Hot water from a boiler used to satisfy heating requirements can be heated to temperatures of 180°F. Parts containing water this hot can scald very quickly. Use extreme caution when servicing or performing maintenance on any parts containing hot water.

For personal safety be sure to turn the electrical power “OFF” at the main entrance (Home Circuit Breaker Box) and at the unit control box circuit breakers before attempting any service or maintenance operations. Homeowners should never attempt to perform any maintenance which requires opening the Ceiling Access Panel door. Refer to Figure 8.

Take precautions to prevent accidental electrical shock. Be sure to turn the electrical power “OFF” at the main entrance (Home Circuit Breaker Box) and at the service disconnect before removing the ceiling access panel. Refer to Figure 8 for drawing of the ceiling access panel.

Do not locate thermostat within three feet of any of the following items:

1. Furnace supply air registers

2. Cooling unit supply air registers

3. Lights or heat lamps

4. Aquariums

5. Televisions, stereo, amplifiers, surround sound systems

6. Stoves or any cooking appliance

7. Refrigerator

8. Washer and/or dryer

9. Hot water tank

10. Sink or near any hot water

11. Within 15 feet of any electric space heater

12. Within two feet of any sunlight

When using separate thermostats a thermostat interlock system must be provided to prevent simultaneous operation of the furnace and air conditioner. Simultaneous operation can result in equipment overheating, equipment damage, and wasted energy.

Do Not connect the Yellow wire to the thermostat unless an outdoor unit is installed.

To avoid personal injury or property damage, make certain that the motor leads cannot come into contact with non-insulated metal components of the Fan Coil Unit.

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