SECTION 8 – TROUBLESHOOTING
FORM 155.32-ICOM2.EN.UL
ISSUE DATE:1/10/2018
164
JOHNSON CONTROLS
Table 50 -
CPU Abnormal
In the case of chilled/hot water suspension, the absorption chiller-heater does not dilute the
solution, but stops immediately. If the absorption chiller-heater is left in this current state,
the solution in it may crystallize within 4-5 hours. To prevent this, dilute the solution.
Table 51 -
Chilled or Hot Water Suspension
If the chiller-heater has a pump problem, it does not perform the diluting operation but stops
immediately. If left in this condition, the solution in the pump may crystallize within 4-5
hours. To prevent this, contact your local Johnson Controls Service Office immediately.
Table 52 -
Pump(s) Overloaded or Overheated
ITEM
CAUSE
COUNTERMEASURE
1
Control board malfunction
Contact your local Johnson Controls Service Office.
NOTE: The time required for refinement of the refrigerant depends on the current
load condition. Constantly check the liquid level in the refrigerant tank while the
refrigerant is refined. If the refrigerant liquid level appears in the level gauge of the
refrigerant tank, close the valve immediately and completely.
ITEM
CAUSE
COUNTERMEASURE
1
Chilled/hot water pump has a
problem.
Check the chilled/hot water pump for a problem.
2
Chilled/hot water flow rate is low.
• Check to see if the chilled/hot flow- rate is below the
setpoint of the water suspension switch. If it is low,
check the flow controller, check the strainer for
clogging.
• Check the opening ratio of the flow control valve.
3
Pressure transfer pipe of water
suspension switch is clogged.
Contact your local Johnson Controls Service Office.
4
Water suspension switch is broken.
ITEM
CAUSE
COUNTERMEASURE
1
Bearings of the pump are worn or clogged.
Contact your local Johnson Controls
Service Office.
2
Pump is damaged by cavitation caused by low
liquid level.
3
Thermal switch is not set properly.
4
Internal cycle control valve is not set properly.
5
Filter in the pump is clogged.
6
Solution is crystallized.
7
Circuit breaker has tripped.
