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Control Service and Troubleshooting
PROBLEM
"LOW SUCTION PRESSURE"
FAULT (CONT'D)
"HIGH DISCHARGE
PRESSURE" FAULT
"LOW LIQUID TEMP"
FAULT
100
CAUSE
4. TXV defective.
5. Reduced flow of chilled
liquid through the cooler.
6. Defective suction pressure
transducer/low pressure
switch or wiring
7. LLSV defective
1. Condenser fans not operating
or operating backwards.
2. Too much refrigerant.
3. Air in refrigerant system.
4. Defective discharge
pressure transducer.
1. Improperly adjusted leaving
chilled liquid temp cut-out
(glysol only).
2. Micropanel setpoint/range
values improperly programmed.
3. Chilled liquid flow too low.
4. Defective LWT or RWT sensor.
(assure the sensor is properly
installed in the bottom of the well
with a generous amount of heat
conductive compound)
SOL
4. Replace TXV.
5. Check GPM (See "Limitations"
in Installation section). Check
operation of pump, clean
pump strainer, purge chilled
liquid system of air.
6. Replace transducer/low
pressure switch or faulty
wiring. Refer to "Service"
section for pressure/voltage
formula.
7. Replace LLSV
1. Check fan motor, fuses,
and contactors. Assure fan
blows air upward.
2. Remove refrigerant.
3. Evacuate and recharge
system.
4. Replace discharge pressure
transducer. Refer to Service
section for pressure/voltage
formula.
1. Re-program the leaving
chilled liquid temp. cut-out.
2. Re-adjust setpoint/range.
3. Increase chilled liquid flow –
refer to Limitations in Instal-
lation section.
4. Compare sensor against a
known good temperature
sensing device. Refer to
Service section for temp/
voltage table.
CONT'D
YORK INTERNATIONAL
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