York EX Series User Manual

JOHNSON CONTROLS
169
SECTION 8 – TROUBLESHOOTING
FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
8
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 COUNTERMEASURE
1 Cooling water temp. is high. Check the capacity of the cooling tower.
2 Cooling water ow rate is insufcient.
• See if the cooling water supply rate matches the specication.
(Check the ow meter, discharge pressure of the cooling water
pump, current, etc.)
• If the ow rate is insufcient, check the opening ratio of the ow
controller valve and check the strainer for clogging.
3 Cooling water heat exchange tube is dirty. Contact your local Johnson Controls Service Ofce.
4 Non-condensable gas remains in machine.
• 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.
5
Chilled/hot water outlet temperature is not set
properly
Set each setting parameter of the chilled/hot water outlet
temperature controller properly
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.
Contact your local Johnson Controls Service Ofce.
9 Surface active agent is depleted.
10 Refrigerant is dirty (contains solution).
11 Internal cycle control valve is not set properly.
12
Chilled/hot water outlet temperature controller
is broken
13 Solution is crystallized.
14 Air leaks in absorption chiller-heater.

York EX Series Specifications

General

Brand	York
Model	EX Series
Category	Chiller
Language	English