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JOHNSON CONTROLS
117
SECTION 8 – TROUBLESHOOTING
FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
8
TROUBLESHOOTING PERFORMANCE
ISSUES
If the performance is low while the capacity control
valve is fully open or if the capacity control valve does
not fully open while the load is normal, check (in or-
der) numbers 1 through 7 in the following below im-
mediately. If the cause of the problem is other than
numbers 1 to 7, it may be one of numbers 8 through
14. In this case, contact your local Johnson Controls
Service Center immediately.
TABLE 30 - TROUBLESHOOTING PERFORMANCE ISSUES
ITEM CAUSE COUNTERMEASURE
1 Cooling water temp. is high. Check the performance of the cooling tower.
2 Cooling water is insufficient.
See if the cooling water supply rate matches the specification.
(Check the flow meter, discharge pressure of the cooling water
pump, current, or other flow measuring gauges.) If the flow rate is
low, check the opening ratio of the flow controller valve and check
the strainer for clogging.
3 Cooling water heat exchange tube is dirty. Contact your local Johnson Controls Service Office.
4 Non-condensable gas remains in machine.
• See Performance Check Method of Vacuum Pump on page 87 .
• Check the performance of the vacuum pump.
• Check the purge unit for a problem. Purge non-condensable
gas from the absorption chiller-heater. If partial-load operation
continues for a long period, non-condensable gas tends to stay
in the absorber. In this case, purge directly from the low-pressure
side (absorber). See
Performance Check Method of Vacuum
Pump on page 87 . Even if the automatic purge unit is installed,
purge from the lower pressure side (absorber) manually.
5
Chilled / hot water outlet temperature is not set
properly. Set each parameter of the chilled / hot water outlet temperature
controller properly
6 Manual refrigerant blow valves are kept open. Check that manual refrigerant blow valve V2 is fully closed.
7 Refrigerant Pump Stop button is lit. Press the Refrigerant Pump Auto button.
8 Corrosion inhibitor is depleted.
Contact your local Johnson Controls Service Office.
9 Surface active agent is depleted.
10 Refrigerant is dirty (contains solution).
11
Internal cycle control valve is not set properly.
12
Chilled / hot water outlet temperature
controller is broken.
13 Solution is crystallized.
14 Air leaks in absorption chiller-heater.