Table 46: Chilled or hot water suspension
Item
Cause
Countermeasure
3
Pressure transfer pipe of water
suspension switch is clogged.
4
Water suspension switch is
broken.
Contact your local Johnson Controls Service Office.
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 can be crystallized in 4-5 hours. To prevent this, contact
your local Johnson Controls Service Office immediately.
Table 47: Pump(s) overloaded or overheated
Item
Cause
Countermeasure
1
Bearings of the pump are worn or clogged.
2
Pump is damaged by cavitation caused by low liquid
level.
3
Thermal switch is not set correctly.
4
Internal cycle control valve is not set correctly.
5
Filter in the pump is clogged.
6
Solution is crystallized.
7
Circuit breaker has tripped.
Contact your local Johnson Controls Service Office.
Model YHAU-CGN/H-CXR(M)Double Effect Direct Fired Small Absorption Chiller-Heater
176
