Specifications

58
CONTROLS (cont)
As the refrigerant leaves the evaporator, the refrigerant passes
a low-pressure switch in the suction line. This low-pressure
switch will de-activate the Perfect Humidity™ package when the
suction pressure reaches 60 psig. The low-pressure switch is
an added safety device to protect against evaporator coil
freeze-up. The low-pressure switch will only de-activate and
open the liquid line solenoid valve in the Perfect Humidity circuit.
The compressors will continue to run as long as there is a call
for cooling, regardless of the position of the low-pressure
switch. The solenoid valve and the Perfect Humidity package
will be re-activated only when the call for cooling has been
satisfied, the low-pressure switch has closed, and a new call for
cooling exists. The crankcase heaters on the scroll compres-
sors provide additional protection for the compressors due to
the additional refrigerant charge in the subcooler.
When the humidistat is satisfied, the humidistat internal switch
opens, cutting power to and opening the LLSV. The refrigerant
is routed back through the evaporator and the subcooler coil is
removed from the refrigerant loop.
When the thermostat is satisfied, C1 (and C2) is deenergized
and the compressor(s) and OFM(s) shut off. After a 30-second
delay, the IFM shuts off. If the thermostat fan selector switch is
in the ON position, the IFM will run continuously.
Perfect Humidity Dehumidification Option