Trane Thermo King Magnum Plus - Operating Theory: Dehumidification and Heat Modes; Dehumidification and Heater Control; Defrost Mode Operation

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OPERATING THEORY
Dehumidification: When the Dehumidify
mode is set to On, the supply air temperature
must be In-range to energize the electric
heaters.
• When the humidity is 2 percent or more
above humidity setpoint, the controller
(energizes) the heaters.
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Controller energizes electric heaters for heat,
defrost and dehumidification:
Heat mode (compressor off): If
supply air temperature is too low, heaters pulse
on and off on a 60 second duty cycle.
Defrost mode: Heaters are on until
evaporator coil temperature increases to
terminate defrost.