YORK INTERNATIONAL
84
TROUBLESHOOTING CHART
PROBLEM
CAUSE
SOLUTION
No display on panel
1. No 115VAC to 2T.
1. Checking wiring and fuses (1 FU and 2 FU).
Unit will not operate
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 Board
4. Replace Power Supply Board or isolate 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
manufacturer’s 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, fan operation,
Motor Contactor may or
and discharge pressure stored in memory.
may not Energize
Air flow from fans must be up.
2. External motor protector tripped.
2. Check for defective External motor protector,
wiring and motor problems. Assure that motor tripped
protector is not 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 contactor.
2. Check contacts and 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 ohms.
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 either sight glass at all times.
FAULT
Add YORK “C” oil if necessary.
2. Too much refrigerant-in oil, particularly on
2. Check crankcase oil heater operation. (350 Watt heater
start-up.
should be “ON” when unit is “OFF”. Measure heater current.
(Should be min. 2 amps.)
3. Liquid Line Solenoid Valve (LLSV) not operating.
3. Check wiring and LLSV.
4. Suction Press. Transducer or wiring defective.
4. Compare display to a gauge (SYS OFF).
Replace defective component.
5. Oil Press. Transducer or wiring defective.
5. Compare suction and oil gauges to display.
Replace defective component.
“LOW SUCTION”
1. Improper Suction Pressure Cut-out adjustment.
1. Adjust per recommended settings and restart unit.
FAULT
2. Low refrig. charge.
2. Repair leak/add refrigerant.
3. Fouled filter drier.
3. Change drier core.
4. Thermal expansion valve adjustment/failure.
4. Adjust compressor suction superheat to 11°F (6.1°C)
or replace power element (or valve).
5. Reduced flow of chilled liquid through cooler.
5. Check GPM (See OPERATING LIMITATIONS)
Check operation of pump. Clean pump strainer,
purge chilled liquid system of air.
6. Defective suction press. transducer.
6. Compare display to gauge. Replace transducer.
7. Fouled compressor suction strainer.
7. Remove and clean strainer.
8. Faulty wiring to transducer.
8. Check wiring.
Содержание YCAZ33BA3
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Страница 19: ...FORM 150 44 NM4 19 YORK INTERNATIONAL FIG 6 SYSTEM WIRING Cont d...
Страница 21: ...FORM 150 44 NM4 21 YORK INTERNATIONAL FIG 7 CONNECTION DIAGRAM Cont d LD01997 LD01998 LD01999...
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