Electrical Maintenance
160
Discharge and Low Pressure Sensors (Optional)
The unit can be configured discharge only, suction only, or discharge and suction. The sensors are located
on the discharge or suction tubes near the compressor. The controller will display the actual discharge or
suction system pressure. The display will show a reading and a bar graph. If the unit is configured with a
suction sensor, the LPCO will be eliminated.
To configure a sensor in the unit (see “Configuration Menu” in the Operating Instruction chapter in this
manual).
Discharge and Low Pressure Sensors Removal
Remove the discharge or suction sensor by performing the following steps:
1. Disconnect the sensor from the control box.
2. Remove the sensor from the discharge or suction tube. The fitting on the line has a Schrader valve
which will prevent refrigerant leakage.
Discharge and Low Pressure Sensor Installation
Install the discharge and low pressure sensor by performing the following steps:
1. Apply Locktite to fitting threads (Red 277).
2. Install sensor on fitting.
3. Route wire harness to control box and connect per wiring diagram.
Condenser Fan and Evaporator Fan Rotation
NOTE: If both the condenser fan and evaporator fans are rotating backwards, diagnose the automatic
phase selection system.
Check Condenser Fan Rotation
Check for proper condenser fan rotation by placing a small cloth or sheet of paper against the condenser
fan grille on the front of the unit. Proper rotation will blow the cloth or paper away from the grille.
Improper rotation will hold the cloth or paper against the grille.
If the condenser fan is rotating backwards, see the unit wiring diagram to correct fan motor wiring at the
fan motor junction box or condenser fan contactor. To correct improper fan rotation, reverse any two fan
power cord leads at the condenser fan contactor (disconnect power supply before reversing leads).
Do not
move the CH ground wire.
Check Evaporator Fan Rotation
Visually inspect the evaporator fan blades for proper rotation. Arrows located on the underside of the fan
deck indicate the correct direction of rotation.
Check both high and low speed evaporator fan rotation by performing Evaporator High and Evaporator
Low tests from the Manual Function Test menu.
If an evaporator fans rotate backwards on one or both speeds, see the unit wiring diagram to correct motor
wiring at the fan motor junction box or evaporator fan contactor (disconnect power supply before
reversing leads). (
Do not
move the ground wire which is labeled CH.)
NOTE: Evaporator fan motor wires EF1, EF2 and EF3 are used on low speed fan operation. Wires
EF11, EF12 and EF13 are used on high speed fan operation.
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