Troubleshooting Performance Issues; Table 51 - Troubleshooting Performance Issues - York EX Series Installation, Operation & Maintenance Instructions Manual

FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
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 of the trouble is other than numbers 1-6, it
may be one of number 7-12. In this case, contact your
local Johnson Controls Service Center immediately.
TABLE 51 - TROUBLESHOOTING PERFORMANCE
ISSUES
ITEM CAUSE
1
Cooling water temp. is high.
2 Cooling water flow rate is insufficient.
3 Cooling water heat exchange tube is dirty.
4 Non-condensable gas remains in machine.
Chilled/hot water outlet temperature is not set
5
properly
6 Manual refrigerant blow valves are kept open.
7 Refrigerant Pump Stop button is pressed.
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 properly.
Chilled/hot water outlet temperature controller
12
is broken
13 Solution is crystallized.
14 Air leaks in absorption chiller-heater.
JOHNSON CONTROLS
COUNTERMEASURE
Check the capacity of the cooling tower.
• See if the cooling water supply rate matches the specification.
(Check the flow meter, discharge pressure of the cooling water
pump, current, etc.)
• If the flow rate is insufficient, check the opening ratio of the flow
controller valve and check the strainer for clogging.
Contact your local Johnson Controls Service Office.
• See Purge Procedure on page 130.
• Check the capacity of the vacuum pump.
• 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 low-pressure side (absorber). See Purge
Procedure on page 130 .
• Even if the automatic purge unit is installed, purge from the lower
pressure side (absorber) manually.
Set each setting parameter of the chilled/hot water outlet
temperature controller properly
Check that manual refrigerant blow valve V8 is fully closed.
Press the Refrigerant Pump Auto button..
Contact your local Johnson Controls Service Office.
SECTION 8 – TROUBLESHOOTING
169
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