JOHNSON CONTROLS
168
FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
SECTION 8 – TROUBLESHOOTING
In the case of
c
hilled/hot
water suspension, the absorp-
tion chiller-heater does not dilute the solution, but
stops immediately. If the absorption chiller-heater is
left as it is, the solution in it may be crystallized in 4-5
hours. To prevent this, dilute the solution according the
instructions shown in
and Diluting Method on page 142
.
TABLE 49 -
CHILLED OR HOT WATER
SUSPENSION
ITEM
CAUSE
COUNTERMEASURE
1
Chilled/hot water pump
has a problem.
Check the chilled/hot water pump for a problem.
2
Chilled/hot
water flow rate
is low.
• Check to see if the
chilled/hot
flow- rate is below the setpoint of the water
suspension switch. If it is low, check the flow controller, check the strainer for
clogging.
• Check the opening ratio of the flow control valve.
3
Pressure transfer pipe of
water suspension switch
is clogged.
Contact your local Johnson Controls Service Office.
4
Water suspension switch
is broken.
If the chiller-heater has a pump problem, it does not
perform the diluting operation but stops immediately.
If left as it is, the solution in it may be crystallized in
4-5 hours. To prevent this, contact your local Johnson
Controls Service Office immediately.
TABLE 50 -
PUMP(S) OVERLOADED OR
OVERHEATED
ITEM
CAUSE
COUNTERMEASURE
1
Bearings of the pump are worn or clogged.
Contact your local Johnson Controls Service
Office.
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.
