York EX Series, Installation, Operation & Maintenance Instructions Manual

Page: 167 / 176

JOHNSON CONTROLS
167
SECTION 8 – TROUBLESHOOTING
FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
8
TABLE 44 - CHILLED OR HOT WATER TIME OUT
OR COOLING WATER TIME OUT
ITEM CAUSE COUNTERMEASURE
1 Pump abnormal Check the water pump.
2
Insufficient water flow • Check the water line.
• Check the water flow.
3 Water suspension relay
abnormal • Check the water suspension relay.
• Check to see if the pipe is clogged.
4 Water pump interlock
abnormal
Check the water pump.
TABLE 45 - PUMP INTERLOCKS
ITEM CAUSE COUNTERMEASURE
1 Water pump interlock was not
established
Check the water pump interlock.
TABLE 46 - LOW COOLING WATER INLET
TEMPERATURE
ITEM CAUSE COUNTERMEASURE
1 Cooling water inlet
temperature control system is
abnormal Check the cooling water inlet temperature control system. If this problem
occurs, the absorption chiller-heater performs the dilution operation
automatically and then stops. Go to the Control Center immediately to
confirm that the dilution took place. If it did not, dilute the solution according
to the procedure shown in Manual Refrigerant Blow Down and Diluting
Method on page 142 .
TABLE 47 - ABNORMAL CONTROL SENSOR
If these problems occur, the absorption chiller-heater
performs the dilution operation and then stops. Go to
the Control Center immediately and confirm that the
dilution took place. If the dilution operation did not
run, dilute the solution. Use the procedure shown in
Manual Refrigerant Blow Down and Diluting Method
on page 142 .
ITEM CAUSE COUNTERMEASURE
1 Contact failure Tighten terminal in control panel
2 Sensor abnormal or
disconnected
Contact your local Johnson Controls Service Office.
3
Inductive noise
TABLE 48 - CPU ABNORMAL
ITEM CAUSE COUNTERMEASURE
1
Control board malfunction Contact your local Johnson Controls Service Office.