Table 42 - Troubleshooting The High Temperature Generator; Table 43 - Refrigerant Overcooling Relay - York EX Series Installation, Operation & Maintenance Instructions Manual

SECTION 8 – TROUBLESHOOTING
TABLE 42 - TROUBLESHOOTING THE HIGH
TEMPERATURE GENERATOR
ITEM CAUSE
Cooling water is insufficient
1
or suspended.
Cooling water temperature
2
at inlet is high.
Non-condensable gas stays
3
in the machine.
Heat exchange tube is dirty
4 (chilled/hot water, cooling
water).
5 Solution is crystallized.
6 Corrosion inhibitor is worn.
Air leaks in absorption
7
chiller-heater.

TABLE 43 - REFRIGERANT OVERCOOLING RELAY

ITEM CAUSE
Chilled/hot water flow rate
1
lowers or changes sharply.
Cooling water temperature
2
at inlet changes sharply.
3 Load lowers sharply.
Refrigerant is dirty
4
(contains solution).
Heat exchange tube is
5
dirty (Chilled/hot water).
Temperature controller or
6
safety switch is broken.
166
• See if the cooling water supply rate conforms to 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.
Check the capacity of the cooling tower.
• 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).
Contact your local Johnson Controls Service Office.
• See if the chilled/hot water flow rate changes sharply (particularly in the case
of variable flow rate specification).
• If it changes sharply, apply a limit of the change rate to the
control or take another measure.
• 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.
See if the load changes sharply.
See if the refrigerant refining operation has been performed periodically. For
the refrigerant refining method, see Refrigerant Refining Method on page
142.
Contact your local Johnson Controls Service Office.
COUNTERMEASURE
COUNTERMEASURE
FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
chilled/hot
flow
JOHNSON CONTROLS