ECM Motors and the Air balancing Technician

For example, with a 5 ton heat pump having a call for 2 stage heat, the motor ramps up from a dead stop to 800 CFM in 15 seconds, silently beginning to run then it stays there for 30 seconds, allowing the indoor coil to completely heat up. This avoids an initial rush of cold air at the beginning of the run cycle. ................
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