JOHNSON CONTROLS
121
FORM 155.33-ICOM2.EN.GB
ISSUE DATE:12/4/2017
8
SECTION 8 – TROUBLESHOOTING
If the chiller-heater has any problems while it is operat-
ing, you need to find the cause and try to fix it. If the
cause is not clear, taking the countermeasure does not
fix the problem, or if the chiller-heater seems to have a
serious problem, contact your local Johnson Controls
Service Center immediately. If the chiller-heater stops
because of a problem, wait until the chilled /hot water
pump, cooling water pump, and chiller-heater unit stop.
Then, take the following actions.
Several items should be checked routinely whenever
the chiller-heater experiences any problems.
• Check to see if the main waste hot water valve was
closed by mistake.
• Open the main valve.
• See if the valves of the chilled / hot water system
and cooling water system are correctly opened and
the specified flow rate is secured.
• See if the cooling tower is operating normally.
• Check the valves and pumps of the cooling water
system and confirm that the specified flow rate is
secured.
Contact your local Johnson Controls Service Center if
any of the following apply:
•
The setting of the water flow rate is unknown.
• It takes 30 minutes or more to restore operations.
• Solution is crystallized.
• The cause of the trouble is not readily apparent.
Check the causes in order. Any of these
causes will start the automatic dilution
operation, then stop the chiller-heater.
Check that the diluting operation was
completed. If it is not, dilute the solution
according to the Manual Refrigerant
Blowdown and Dilution Method on page
97.
TABLE 26 -
TROUBLESHOOTING THE HIGH TEMPERATURE GENERATOR
ITEM
CAUSE
COUNTERMEASURE
1
Cooling water is low or not
flowing.
See if the cooling water supply rate matches the specification. (Check the flow
meter, discharge pressure of the cooling water pump, current, etc.) If the flow rate
is low, check the opening ratio of the flow controller valve and check the strainer for
clogs.
2
Cooling water temperature
at inlet is high.
Check the performance of the cooling tower.
3
Non-condensable gas stays
in the machine.
• Check the capacity of the vacuum pump.
• Check the purge unit. Purge air from the chiller-heater See
. If partial load operation is continued for a long period, non-
condensable gas tends to stay in the absorber. In this case, purge directly from
the absorber. Use the instructions in
4
Heat exchange tube is dirty
(chilled / hot water, cooling
water).
Contact your local Johnson Controls Service Office.
5
Solution is crystallized.
6
Corrosion inhibitor is worn.
7
Air leaks in absorption
chiller-heater.
