York Millennium YCAJ150, Installation Operation & Maintenance, Page: 113 / 116

FORM 150.65-NM4
113 YORK INTERNATIONAL
“Chiller Fault: Low 3. Defective LWT or RWT sensor. 3. Check according to following table (use
Water Temp” (Assure the sensor is properly in- digital volt meter)*. Replace if necessary.
(Cont’d) stalled in the bottom of the well
with a generous amount of heat
TEMP. VOLTAGE (DC)
conductive compound. 20.0°F (11.1°C) 1.65
NOTE: It is not unusual to find up
22.0°F (12.2°C) 1.71
to a +/–2°F (1.1°C) difference
25.0°F (13.9°C) 1.82
between the display and a thermo-
27.0°F (15.0°C) 1.88
meter located in water piping.
30.0°F (16.7°C) 1.99
33.0°F (18.3°C) 2.09
36.0°F (20.0°C) 2.22
38.0°F (21.1°C) 2.28
41.0°F (22.8°C) 2.37
43.0°F (23.9°C) 2.43
46.0°F (25.6°C) 2.54
48.0°F (26.7°C) 2.60
50.0°F (27.8°C) 2.67
53.0°F (29.4°C) 2.77
55.0°F (30.6°C) 2.83
57.0°F (31.7°C) 2.89
59.0°F (32.8°C) 2.95
61.0°F (33.9°C) 3.02
63.0°F (35.0°C) 3.08
65.0°F (36.1°C) 3.14
67.0°F (37.2°C) 3.20
70.0°F (38.9°C)
3.28
* Check voltage on Microprocessor Board.
LWT: J11-7 to J11-1
RWT: J11-8 to J11-1
Low Compressor Oil 1. Low oil charge. 1. Oil level should be visible in either sight
Level glass at all times. Add YORK “C” oil if
(Particularly at necessary.
start-up) 2. Excessive flood back of liquid 2. Adjust Thermal Expansion Valve (TXV) or
refrigerant. replace 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.
Crankcase Heater 1. Open at 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 won’t 1. Suction pressure > programmed un- 1. Excessive load. Check OPERATING LIMI-
load load point or operating limitations TATIONS. Check programmed unloading
(Solenoid valve de- have been exceeded. point.
energizes to load 2. Discharge pressure > programmed 2. Check OPERATING LIMITATIONS.
compressor) unload point or operating limitations Check programmed unloading point.
have been exceeded.
3. Demand not great enough. 3. OK. Become familiar with control operation.
4. Defective loading solenoid. 4. Replace compressor loading solenoid.
PROBLEM CAUSE SOLUTION