Troubleshooting performance issues
If the performance is insufficient while the capacity control valve is fully opened or if the capacity
control valve does not fully open while the load is sufficient, check numbers 1-6 in the following
table in order. If the cause is found in numbers above 6, contact your local Johnson Controls Service
Center immediately.
Table 48: Troubleshooting performance issues
Item
Cause
Countermeasure
1
Cooling water temp. is high.
Check the capacity of the cooling tower.
2
Cooling water flow rate is insufficient.
• See if the cooling water supply rate matches the specification. Check the flow meter, discharge pressure
of the cooling water pump, current, and other applicable gauges or pumps.
• If the flow rate is insufficient, 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
.
• Check the purge unit for trouble.
• Purge non-condensable gas from the absorption chiller-heater.
• If partial-load operation is continued for a long period, non-condensable gas tends to stay in the
absorber. See
.
• Even if the automatic purge unit is installed, purge from the absorber manually.
5
Chilled/hot water outlet
temperature is not set correctly
Set each setting parameter of the chilled/hot water outlet temperature controller correctly
6
Manual refrigerant blow
valves are kept open.
Check that manual refrigerant blow valve V8 is fully closed.
7
Refrigerant Pump
Stop
button is pressed.
Press the refrigerant pump
Auto
button.
8
Corrosion inhibitor is depleted.
9
Surface active agent is depleted.
10
Refrigerant is dirty (contains solution).
11
Internal cycle control
valve is not set correctly.
12
Chilled/hot water outlet
temperature controller is broken
13
Solution is crystallized.
14
Air leaks in absorption chiller-heater.
Contact your local Johnson Controls Service Office.
Abnormal solution and refrigerant levels
Causes of abnormal levels of solution and refrigerant and countermeasures against them are
shown in Table 49. If the level of the solution or refrigerant is abnormal, correct it according to the
following procedure.
177
Model YHAU-CGN/H-CXR(M)Double Effect Direct Fired Small Absorption Chiller-Heater
