York EX Series User Manual

JOHNSON CONTROLS
166
FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
SECTION 8 – TROUBLESHOOTING
TABLE 42 - TROUBLESHOOTING THE HIGH
TEMPERATURE GENERATOR
ITEM CAUSE COUNTERMEASURE
1
Cooling water is insufcient
or suspended.
• See if the cooling water supply rate conforms to 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.
2
Cooling water temperature
at inlet is high.
Check the capacity of the cooling tower.
3
Non-condensable gas stays
in the machine.
• Check the capacity of the vacuum pump.
• Check the purge unit.
• Purge air from the chiller-heater (See SECTION 7 – MAINTENANCE).
• If partial load operation continues for a long period, non-condensable gas tends
to stay in the absorber. In this case, purge directly from the absorber. Use the
instructions shown in SECTION 7 – MAINTENANCE).
4
Heat exchange tube is dirty
(chilled/hot water, cooling
water).
Contact your local Johnson Controls Service Ofce.
5 Solution is crystallized.
6 Corrosion inhibitor is worn.
7
Air leaks in absorption
chiller-heater.
TABLE 43 - REFRIGERANT OVERCOOLING RELAY
ITEM CAUSE COUNTERMEASURE
1
Chilled/hot water ow rate
lowers or changes sharply.
• See if the chilled/hot water ow rate changes sharply (particularly in the case
of variable ow rate specication).
• If it changes sharply, apply a limit of the change rate to the chilled/hot ow
control or take another measure.
2
Cooling water temperature
at inlet changes sharply.
• See if the cooling water temperature at inlet changes sharply (by checking
start and stop of the fan).
• If the chiller-heater refrigerant temperature is low, the chiller-heater stops
immediately but does not perform the diluting operation. If left as it is, the
solution may be crystallized in 4-5 hours. To prevent this, dilute the solution
according to the information shown in Manual Refrigerant Blow Down and
Diluting Method on page 142.
3 Load lowers sharply. See if the load changes sharply.
4
Refrigerant is dirty
(contains solution).
See if the refrigerant rening operation has been performed periodically. For
the refrigerant rening method, see Refrigerant Rening Method on page
142.
5
Heat exchange tube is
dirty (Chilled/hot water).
Contact your local Johnson Controls Service Ofce.
6
Temperature controller or
safety switch is broken.

York EX Series Specifications

General

Brand	York
Model	EX Series
Category	Chiller
Language	English