100
YORK INTERNATIONAL
TROUBLESHOOTING CHART
PROBLEM
CAUSE
SOLUTION
No display on panel
1. No 115VAC to 2T.
1. Checking wiring and fuses (1 FU and 2
Unit will not operate
FU). Check emergency stop contacts
5
to
1
.
2. No 24VAC to Power Supply Board.
2. Check wiring 2T to Power Supply Board.
3. 2T defective, no 24VAC output.
3. Replace 2T.
4. No +12V output from Power Supply
4. Replace Power Supply Board or isolate
Board.
excessive load on the board.
Contact YORK Service Before Replacing Circuit Boards!
NO RUN PERM
1. No flow.
1. Check chilled liquid flow.
2. Flow switch installed improperly.
2. Check that flow switch is installed
according to manufacturers Instructions.
3. Defective flow switch.
3. Replace flow switch.
4. Remote cycling device open.
4. Check cycling devices connected to
terminals 13 & 14 of the TB3 Terminal
Block.
5. System switch in the OFF position.
5. Place switches to the ON position.
MOTOR CURRENT CONTACTOR DOES NOT ENERGIZE
FAULT
1. External high pressure switch tripped. 1. Check external high pressure switch,
cooling tower operation, and discharge
Motor Contactor may
pressure stored in memory.
or may not Energize
2. External motor protector tripped.
2. Check for defective External motor
protector, wiring and motor problems.
Assure that motor protector is not tripped
due to external high pressure switch.
3. Defective relay output board.
3. Replace relay output board.
CONTACTOR ENERGIZES
1. Improper system high voltage.
1. Check system high voltage supply.
2. Defective contactor contacts and
2. Check contacts and contactor.
contactor.
3. Faulty high voltage wiring.
3. Check wiring.
4. High motor current stored in memory.
4. Loose calibration resistors in J9 (SYS 1)
or J10 (SYS 2) of power supply board.
5. Defective current transformer (CT).
5. CT resistance 42-44
Ω
.
Contact YORK Service Before Replacing Circuit Boards or C.T.s!
LOW OIL PRESS
1. Low oil charge.
1. Oil level should be visible in sight glass
FAULT
at all times. Add YORK C oil if
necessary.
2. Too much refrigerant-in oil,
2. Check crankcase oil heater operation.
particularly on start-up.
(350 Watt heater should be ON when
unit is OFF. Measure heater current.
(Should be min. 2 amps.)
3. Liquid Line Solenoid Valve (LLSV)
3. Check wiring and LLSV.
not operating.
4. Suction Press. Transducer or wiring
4. Compare display to a gauge (SYS OFF).
defective.
Replace defective component.
5. Oil Press. Transducer or wiring -
5. Compare suction and oil gauges to
defective.
display. Replace defective component.
Summary of Contents for YCWJ45EE0
Page 29: ...FORM 150 24 NM27 YORK INTERNATIONAL 29 CONTROL CIRCUIT With I O Expansion Board LD02106...
Page 30: ...30 YORK INTERNATIONAL FIG 9 SYSTEM WIRING...
Page 31: ...FORM 150 24 NM27 YORK INTERNATIONAL 31 LD02678...
Page 35: ...FORM 150 24 NM27 YORK INTERNATIONAL 35 LD02679...
Page 36: ...36 YORK INTERNATIONAL MICROPANEL CONNECTION DIAGRAM With I O Expansion Board LD02107...
Page 37: ...FORM 150 24 NM27 YORK INTERNATIONAL 37 LD02108...