JOHNSON CONTROLS
159
SECTION 8 – TROUBLESHOOTING
FORM 155.31-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
8
In the case of chilled water suspension, the absorption
chiller does not perform the dilution operation. It stops
immediately. If the absorption chiller is left as it is, the
solution in it may crystallize in 4-5 hours. To prevent
this, dilute the solution. Use the procedure shown in
Manual Refrigerant Blow Down and Diluting Method
on page 137.
TABLE 37 - CHILLED WATER SUSPENSION
ITEM CAUSE COUNTERMEASURE
1
Chilled water pump has a
problem.
Check the chilled water pump for a problem.
2
Chilled water ow rate is
low.
Check to see if the chilled water ow rate is below the set point of the water
suspension switch. If it is low, check the ow controller, check the strainer for
clogging, and check the opening ratio of the ow control valve.
3
Pressure transfer pipe of
water suspension switch
is clogged.
Contact your local Johnson Controls Service Ofce.
4
Water suspension switch
is broken.
If the chiller has a pump problem it does not perform
the dilution operation. It stops immediately. If left as
is, the solution in it may crystallize in 4-5 hours. To
prevent this, contact your local Johnson Controls Ser-
vice Office immediately.
TABLE 38 - PUMPS OVERLOADED OR
OVERHEATED
ITEM CAUSE COUNTERMEASURE
1 Bearings of the pump are worn or clogged.
Contact your local Johnson Controls Service
Ofce.
2 Pump is damaged by cavitation caused by low liquid level.
3 Thermal switch is not set properly.
4 Internal cycle control valve is not set properly.
5 Filter in the pump is clogged.
6 Solution is crystallized.
7 Circuit breaker has tripped.
TABLE 39 - CHILLED WATER TIME OUT OR
COOLING WATER TIME OUT
ITEM CAUSE COUNTERMEASURE
1 Pump abnormal Check the water pump
2 Insufcient water ow Check the water line and check the water ow
3 Water suspension relay
abnormal
Check the water suspension relay. Check to see if the pipe is clogged or not.
4 Water pump interlock
abnormal
Check the water pump.
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