Troubleshooting
If the chiller has any problems, or an abnormal condition is detected while it operates, find the
cause. Use the following listed procedures to fix the problem.
If the cause is not clear, using the countermeasure cannot repair the problem, or if the chiller
seems to have a serious problem, contact your local Johnson Controls Service Center immediately.
If the chiller stops because of a problem, wait until the chilled water pump, cooling water pump,
and chiller unit stop completely, then verify the following items.
Causes of lighting of trouble indicator lamps on control panel of absorption chiller and
countermeasures against them.
Check several items routinely whenever the chiller experiences any trouble or abnormality.
• Check to see if the main steam supply valve was closed by mistakes.
• Open the main valve.
• See if the valves of the chilled water system and cooling water system are set correctly. Verify the
flow rate.
• See if the cooling tower is operating normally.
• Check the valves and pumps of the cooling water system. Verify the flow rate.
Contact your local Johnson Controls Service Center if any of the following apply:
• The water flow rate setting is unknown.
• It takes 30 minutes or more to restore operations.
• Solution is crystallized.
• The cause of the trouble is not readily apparent.
Note: Check the causes in order. Any of these causes can state the diluting operation
automatically then stop the chiller. Check that the diluting operation was completed, and if
not, dilute the solution according to the procedure shown in Manual refrigerant blowdown and
diluting method.
Table 34: Troubleshooting the high temperature generator
Item Cause Countermeasure
1 Cooling water is insufficient or suspended.
• Check if the cooling water supply rate matches the
specification.
• Check the flow meter, discharge pressure of the cooling water
pump, current, and other cooling water outlets
• If the flow rate is insufficient, check the opening ratio of the
flow controller valve and check the strainer for clogging.
2
Cooling water temperature at inlet of
absorption chiller is high.
Check the capacity of the cooling tower.
169YHAU-C Single Effect Steam-Fired Absorption Chiller
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