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Unit Description

Protection Features

High Pressure Transducer: The high pressure transducer

is a pressure sensitive device. It is located in the discharge line

near the oil separator or the discharge check valve. If the

discharge pressure rises above the transducer’s opening

pressure, the ECM opens the circuit to the compressor clutch to

stop the unit.

Low Pressure Cutout Switch: The Low Pressure Cutout

Switch is a pressure sensitive switch located in the suction line.

If the pressure falls below acceptable limits, the switch opens

the LPCO/CH circuit. This signals the ECM to open the circuit

to the compressor clutch to stop unit operation.

Fuses

Fuse 1: Protects the Power Supply Circuit.

Fuse 2: Protects the Condenser Fan Motor (CFM1).

Fuse 3: Protects the Evaporator Fan Motor (EF1).

Fuse 4: Protects the Evaporator Fan Motor (EF2).

Fuse 5: Protects the Compressor Clutch 1 (CCL1), Liquid

Injection Switch (LIS), Liquid Injection Valve (LIV), Host Hot

Gas Defrost Solenoid Valve (PS1), Compressor Motor

Contactor (CC), 26A Circuit to Heat Option

Fuse 6: Protects the Condenser Fan 1, 2 (CFM1and CFM2).

Fuse 7: Protects the Condenser Fan Motor (CFM2).

Fuse 8: Protects the Remote Liquid Solenoid Valve (PS2), Host

Liquid Solenoid Valve (PS3), Remote Hot Gas Defrost

Solenoid Valve (PS4), and Suction Bypass Solenoid (PS6).

Fuse 9: Protects theEvaporator Fan Motor (EFM3)

Fuse 10: Protects theEvaporator Fan Motor (EFM4)

Fuse 11: Protects the Defrost Drain Heaters (DH1 and DH2)

Fuse 20: Transformer Input (L1)

Fuse 21: Battery Relay (Located in 2 wire near battery)