JOHNSON CONTROLS
174
FORM 150.72-NM1 (1020)
Service and Troubleshooting
TROUBLESHOOTING
TABLE 27 – TROUBLESHOOTING
PROBLEM
CAUSE
SOLUTION
NO DISPLAY ON PANEL. UNIT
WILL NOT OPERATE.
1. No 115VAC to 24 VAC
Transformer.
1a. Check wiring and fuse 1FU.
1b. Check wiring emergency stop contacts 5 to
L of XTBC2 Terminal Block.
1c. Replace Control Transformer.
2. No 24VAC to Microboard.
2. Check wiring Control Transformer to
Microboard.
3. Control Transformer defective,
no 24VAC output.
3. Replace Control Transformer.
4. Short in wire to temp. sensors or
pressure transducers.
4. Unplug connections at IPU II & I/O Board to
isolate.
5. Defective IPU II & I/O Board or
the Display Board.
5. Replace IPU II & I/O Board or the Display
Board.
Contact Johnson Controls
Service before replacing
circuit Boards!
FLOW SWITCH/REM STOP NO
RUN PERMISSIVE
1. No chilled liquid flow.
1. Check chilled liquid flow.
2. Flow switch improperly installed.
2. Check that the 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 and 14 of the XTBC1 Terminal
Block.
LOW SUCTION PRESSURE
FAULT
1. Improper suction pressure
cutouts adjustments.
1. Adjust per recommended settings.
2. Low refrigerant charge.
2. Repair leak if necessary and add refrigerant.
3. Fouled filter dryer.
3. Change dryer/core.
4. TXV defective.
4. Replace TXV.
5. Reduced flow of chilled liquid
through the cooler.
5. Check GPM (
See “Limitations” liquid through
the cooler in Installation section)
. Check
operation of pump, clean pump strainer,
purge chilled liquid system of air.
6. Defective suction pressure
transducer/low pressure switch
or wiring.
6. Replace transducer/low pressure switch or
faulty switch or wiring.
Refer to “Service”
section for pressure/voltage formula.
7. LLSV defective
7. Replace LLSV
HIGH DISCHARGE PRESSURE
FAULT
1. Condenser fans not operating or
operating backwards.
1. Check fan motor, and contactors. Assure fan
blows air upward.
2. Too much refrigerant.
2. Remove refrigerant.
3. Air in refrigerant system.
3. Evacuate and recharge system.
4. Defective discharge pressure
transducer.
4. Replace discharge pressure transducer.
Refer to Service section for pressure/voltage
formula.
Содержание YORK Tempo YLAA Series
Страница 4: ...JOHNSON CONTROLS 4 FORM 150 72 NM1 1020 THIS PAGE INTENTIONALLY LEFT BLANK...
Страница 12: ...JOHNSON CONTROLS 12 FORM 150 72 NM1 1020 THIS PAGE INTENTIONALLY LEFT BLANK...
Страница 14: ...JOHNSON CONTROLS 14 FORM 150 72 NM1 1020 THIS PAGE INTENTIONALLY LEFT BLANK...
Страница 18: ...JOHNSON CONTROLS 18 FORM 150 72 NM1 1020 THIS PAGE INTENTIONALLY LEFT BLANK...
Страница 36: ...JOHNSON CONTROLS 36 FORM 150 72 NM1 1020 THIS PAGE INTENTIONALLY LEFT BLANK...
Страница 49: ...FORM 150 72 NM1 1020 49 JOHNSON CONTROLS THIS PAGE INTENTIONALLY LEFT BLANK...
Страница 71: ...FORM 150 72 NM1 1020 71 JOHNSON CONTROLS THIS PAGE INTENTIONALLY LEFT BLANK...
Страница 73: ...FORM 150 72 NM1 1020 73 JOHNSON CONTROLS 5 5...
Страница 75: ...FORM 150 72 NM1 1020 75 JOHNSON CONTROLS 5 5...
Страница 77: ...FORM 150 72 NM1 1020 77 JOHNSON CONTROLS 5 5...
Страница 79: ...FORM 150 72 NM1 1020 79 JOHNSON CONTROLS 5 5...
Страница 81: ...FORM 150 72 NM1 1020 81 JOHNSON CONTROLS 5 5...
Страница 83: ...FORM 150 72 NM1 1020 83 JOHNSON CONTROLS 5 5...
Страница 85: ...FORM 150 72 NM1 1020 85 JOHNSON CONTROLS 5 5 LD13901...
Страница 87: ...FORM 150 72 NM1 1020 87 JOHNSON CONTROLS 5 5...
Страница 89: ...FORM 150 72 NM1 1020 89 JOHNSON CONTROLS 5 5 LD13232...
Страница 90: ...JOHNSON CONTROLS 90 FORM 150 72 NM1 1020 Technical Data DUAL PUMP WIRING LD13237 FIG 21 DUAL PUMP WIRING...
Страница 91: ...FORM 150 72 NM1 1020 91 JOHNSON CONTROLS THIS PAGE INTENTIONALLY LEFT BLANK...
Страница 92: ...JOHNSON CONTROLS 92 FORM 150 72 NM1 1020 Technical Data WIRING LD13238 FIG 22 WIRING...
Страница 93: ...FORM 150 72 NM1 1020 93 JOHNSON CONTROLS 5 5 LD13239...
Страница 160: ...JOHNSON CONTROLS 160 FORM 150 72 NM1 1020 Unit Operation FIG 28 CONDENSER FAN LOCATIONSWIRING DIAGRAMS...
Страница 176: ...JOHNSON CONTROLS 176 FORM 150 72 NM1 1020 THIS PAGE INTENTIONALLY LEFT BLANK...
Страница 191: ...FORM 150 72 NM1 1020 191 JOHNSON CONTROLS 10 NOTES...