78
YORK INTERNATIONAL
PROBLEM
CAUSE
SOLUTION
“CHILLER FAULT:
1. Temperature sensed incorrectly by
1. Verify actual ambient temperature at probe
±
10°F
HIGH AMBIENT TEMP”
thermistor.
with a thermometer placed next to the OAT
Cuts out on high
sensor.
ambient temperature.
2. Fans rotating backwards.
2. Air flow must be up. Correct fan rotation.
(Max. = 130°F will
3. Air flow to unit restricted (or being
3. Check installation clearances. (See page 8.)
re-start automatically
re-circulated.)
if temperature drops
4. High ambient cut-out set too low.
4. Reprogram cut-out.
below 128°F)
“CHILLER FAULT:
1. Temperature of outside air is below
1. No problem exists.
LOW AMBIENT TEMP”
cut-out setting.
Cuts out on low
2. Temperature sensed incorrectly by
2. Verify actual ambient temperature immediately
ambient temperature.
thermistor.
at probe with thermometer.
(25°F min. for std.
3. Check low ambient temperature
3. Adjust if necessary.
adjustable for low
Cut-out setting on the display.
ambient unit.)
NOTE: For occasional operation below 0°F set
NOTE: Operation
the cutout at 0°F. The chiller is then allowed to
below 25°F requires
operate regardless of temperature. A low ambient
low ambient accessory.
kit must be installed.
Low Compressor
1. Low oil charge.
1. Oil level should be visible in either sight glass
Oil Level
at all times. Add YORK “C” oil if necessary.
(Particularly on
2. Excessive flood back of liquid
2. Adjust Thermal Expansion Valve (TXV) or replace
start-up)
refrigerant.
power element. Check TXV bulb location. Should
be located on suction line at least 8"-10" from
nearest elbow. Bulb should be at 4 o’clock or 8
o’clock position, have good contact with suction
line and be well insulated.
3. Check piping design
3. Modify piping.
Crankcase Heater
1. Open in 115VAC wiring to heater.
1. Check wiring.
won’t Energize
2. Defective heater.
2. Replace heater.
(Should energize any-
3. Auxiliary contacts of compressor
3. Replace contactor.
time unit is “OFF”)
contactor defective.
(Min. current draw
= 2 amps)
Compressor
1. Suction pressure > programmed
1. Excessive load. Check OPERATING
won’t load
unload point or operating limitations
LIMITATIONS. Check programmed unloading
(Solenoid valve
have been exceeded.
point.
de-energizes to
2. Discharge pressure > programmed
2. Check OPERATING LIMITATIONS. Check
load compressor)
unload point or operating limitations
programmed unloading point.
have been exceeded.
3. Demand not great enough.
3. OK. Becomes familiar with control operation.
4. Defective loading solenoid.
4. Replace compressor loading solenoid.
5. Faulty wiring to loading solenoid.
5. Check wiring.
6. Defective evaporator or optional
6. Replace transducer after verifying with a gauge.
discharge transducer.
Содержание YCUZ330A3
Страница 79: ...FORM 195 26 NM3 YORK INTERNATIONAL 79 LD00643...
