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WHITE RODGERS 36H54 GAS VALVE
Two-Stage
GAS VALVE SWITCH SHOWN IN ON POSITION.
Inlet Pressure Tap
Outlet Pressure
Tap
High Fire Adjustment
(under cap)
Low Fire Adjustment
(under cap)
FIGURE 17
1 - If using an electromechanical thermostat, set to the
lowest setting.
2 -
power to the appliance.
3 - Open or remove the heat section access panel.
4 - Turn gas valve clockwise to “OFF”. Do not force.
D-Safety or Emergency Shutdown
valves.
WARNING
Danger of explosion. Can cause injury or death. Do
not attempt to light manually. Unit has a direct spark
ignition system.
E-Cooling Start Up
IMPORTANT
If unit is equipped with a crankcase heater. Make
sure heater is energized 24 hours before unit start-
up to prevent compressor damage as a result of
slugging.
1 - Initiate full load cooling operation using the following
RTU MENU > SERVICE > COMPONENT TEST >
COOLING > COOLING STAGE 3
2 - Refer to Cooling Operation section for cooling start-
up.
3 - Units have two refrigerant circuits. See FIGURE 18
or FIGURE 19.
4 - Each refrigerant circuit is charged with R410A
refrigerant. See unit rating plate for correct amount
of charge.
Refer to Refrigerant Check and Charge section for
proper method to check refrigerant charge.
Three Phase Scroll Compressor Voltage Phasing
Three phase power supplied to the unit disconnect switch
must be phased sequentially to ensure the scroll com-
pressor and indoor blower rotate in the correct direction.
Compressor and blower are wired in phase at the factory.
2-yellow, line 3-blue.
1 - Observe suction and discharge pressures and
blower rotation on unit start-up.
2 - Suction pressure must drop, discharge pressure
must rise and blower rotation must match rotation
marking.
3 - Disconnect all remote electrical power supplies.
4 -
the line side of K2 contactor or disconnect switch if
installed. Do not reverse wires at blower contactor.
Make sure the connections are tight. Discharge and
suction pressures should operate at their normal
start-up ranges.
F-Safety or Emergency Shutdown
valves.
1
2
INDOOR COIL
STAGE 2
INDOOR COIL
STAGE 1
OUTDOOR COIL
STAGE 2
OUTDOOR COIL
STAGE 1
OUTDOOR
FAN 1
OUTDOOR
FAN 2
B4
B5
REFRIGERANT STAGES - 078, 092, 102
(BOTH FANS ARE ENERGIZED IN LOW SPEED WITH A
Y1 DEMAND AND HIGH SPEED WITH A Y2 DEMAND)
FIGURE 18
REFRIGERANT STAGES - 122, 150
1
2
INDOOR COIL
STAGE 2
INDOOR COIL
OUTDOOR COIL
STAGE 2
OUTDOOR COIL
STAGE 1
OUTDOOR
FAN 1
OUTDOOR
FAN 2
B4
B5
B21
OUTDOOR
FAN 3
(ALL FANS ARE ENERGIZED IN LOW SPEED WITH A
Y1 DEMAND AND HIGH SPEED WITH A Y2 DEMAND)
FIGURE 19
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