Johnson Controls York YHAU-CGH-CXR Series, Installation, Commissioning, Operation, And Maintenance

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Table 49: Abnormal solution and refrigerant levels
Section Normal condition Abnormal condition Cause Countermeasure
High temperature
of cooling water
inlet temperature.
Low temperature of
chilled water outlet
temperature.
Cooling water tube
fouling
Purge trouble
Refrigerant
Overflow (G101)
Air leakage
• See if the cooling water supply rate
is conformed to the specification.
(Check the flow meter, discharge
pressure of the cooling water
pump, current, and other applicable
meters and gauges). If the flow rate
is insufficient, check the opening
ratio of the flow controller valve and
check the strainer for clogging.
• Check the capacity of the cooling
tower.
• See Purge procedure .
• 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. In this case, purge
directly from the absorber, see
Purge procedure .
Refrigerant
Tank (G102)
Cooling water inlet
temperature is low.
Setpoint error of
automatic start/
stop switch.
• Check cooling water inlet
temperature.
• Check the setpoint.
Purging is in
sufficient.
See Purge procedure .
Adjusting valve
opening setting
error.
Solution
Tank (G103)
Solution is
crystallized.
Contact your local Johnson Controls
Service Center.
Causes of insufficient vacuum level of the purge line and countermeasure against the insufficient
level. Causes of insufficient vacuum level of the purge line and countermeasure against the
insufficient level.
Table 50: Insufficient vacuum levels
Item Cause Countermeasure
1 Water ejector trouble.
Contact your local Johnson Controls Service
Office.
2 Water pressure is not enough or the water valve do not open. Check the water pressure or open the water
valve.
3
Incorrect operation of purging line switching when the water
ejector capacity was checked.
• See Purge procedure .
• Confirm that the valve is open or closed.
4 Leakage in purge pipe line.
5 Blocked or dysfunctional purge solenoid valves.
6 Check valve does not open.
Contact your local Johnson Controls Service
Office.
Model YHAU-CGN/H-CXR(M)Double Effect Direct Fired Small Absorption Chiller-Heater 178