78 YORK INTERNATIONAL
DUAL CIRCUIT UNITS
PROBLEM CAUSE SOLUTION
Compressor won’t load 1. Suction Pressure >105 PSIG (723 kPaG) 1. Excessive load. Check OPERATING
(solenoid valve de-ener- (System #1) or >95 PSIG (654.5 kPaG) LIMITATIONS on page 3. Allow
gizes to load compres- (System #2) unit to operate until suction pressure
sor) drops to 95 PSIG (654.5 kPaG) (System
#1) or 85 PSIG (585.6 kPaG) (System #2)
2. Discharge Pressure >390 PSIG (2687 2. Check OPERATING LIMITATIONS
kPaG) (System #1) or >380 PSIG on page 3. Will reload @ 330 PSIG
(2618 kPaG) (System #2) (227.4 kPaG) (System #1) or 320 PSIG
(2205 kPaG) (System #2)
3. Demand not great enough 3. OK
4. Defective Loading Solenoid 4. Replace Compressor Loading Solenoid
5. Faulty Wiring to Loading Solenoid 5. Check Wiring
6. Defective Water Temp. Sensor 6. Replace appropriate Sensor (LWT or
RWT) (See chart under F11 Fault Code)
7. Defective Evaporator Transducer 7. Replace Transducer
8. Relay Output Board defective 8. Replace Relay Output Board (Contact
the local YORK service representative)
9. Defective Micro Board 9. Replace Micro Board (Contact the
local YORK service representative)
Lack of Cooling Effect 1. Fouled Evaporator Surface 1. Contact the local YORK service
representative.
2. Faulty Compr. Suction and/or 2. Contact the local YORK service
Discharge Valves representative.
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