Manual
2100-468E
Page
18 of 27
START UP AND OPERATION
THREE PHASE SCROLL COMPRESSOR
START UP INFORMATION
(Models PH13362-B, PH13422-B, -C; PH13482-B,
-C; PH13602-B, -C)
All units with three phase scroll compressors are equipped
with a three phase line monitor to prevent compressor
damage due to phase reversal.
The phase monitor in this unit is equipped with two LED’s.
If the “Y” signal is present at the phase monitor and phases
are correct, the green LED will light.
If phases are reversed, the red fault LED will be lit and
compressor operation is inhibited.
If a fault condition occurs, reverse tow of the supply leads
to the unit. Do not reverse any of the unit factory wires as
damage may occur.
SEQUENCE OF OPERATION
BLOWER ONLY
– When the “Fan” switch on the room
thermostat is placed in the “On” position (circuit R-G
makes), the blower will energize and run until the “Fan”
switch is placed back into the “Auto” position. This will
allow for constant air circulation at a lower airflow during
times when the unit is not in operation for cooling or
heating.
COOLING
– On a call for cooling from the room
thermostat (circuit R-Y makes), the blower will energize
(circuit R-G is automatic when R-Y makes) as well as the
compressor, and outdoor fan motor. Note that if the “Fan”
switch on the room thermostat is in the “On” position and
the blower is already in operation, then the motor will ramp
up to the required speed for cooling.
HEATING (1st Stage)
– On a call for heating from the
room thermostat (circuit R-Y&B makes), the blower will
energize (circuit R-G is automatic when R-Y makes) as
well as the compressor, outdoor fan motor, and reversing
valve solenoid coil. This will place the system into heat
pump operation to maintain the thermostat set temperature.
Note that if the “Fan” switch on the room thermostat is in
the “On” position and the blower is already in operation,
then the motor will ramp up to the required speed for
heating.
HEATING (1st Stage Defrost)
– During the defrost
cycle, the heat pump control will energize electric heaters,
if installed, (circuit R-W2 makes), allowing room
temperature to be maintained during heat pump defrost
operation.
HEATING (2nd Stage)
– If the operation of the heat
pump will not maintain the set room temperature, then the
thermostat will call for additional heat from electric heaters
to help maintain the set temperature. On a call for second
stage heating from the room thermostat (circuit R-W2
makes), backup electric heaters will be energized if
installed.
HEATING (Em Heat)
– When the room thermostat is
placed in the “Em Heat” position (circuit R-E makes), the
blower and electric heaters, if installed, will energize on
second stage heat (circuit R-W2&W3 makes), with the
compressor and outdoor fan motor locked out of operation.
