Table 35 - Troubleshooting The High Temperature Generator; Table 36 - Chilled Water Overcooling Or Refrigerant Overcooled - York YHAU-CW Manual

SECTION 8 – TROUBLESHOOTING
TABLE 35 - 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
4 dirty (chilled water, cooling
water).
5 Solution is crystallized.
6
Corrosion inhibitor is worn.
Air leaks in absorption
7
chiller.
TABLE 36 - CHILLED WATER OVERCOOLING OR
REFRIGERANT OVERCOOLED
ITEM CAUSE
Chilled 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 water).
Temperature controller or
6
safety switch is broken.
158
• See if the cooling water supply rate conforms to the specification. Check the flow
meter, discharge pressure of the cooling water pump, current,and other applicable
pumps or pressures.
• 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 (See SECTION 7 – MAINTENANCE).
• 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
(according to instructions in SECTION 7 – MAINTENANCE).
Contact your local Johnson Controls Service Office.
See if the chilled 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 chilled water flow control or take another measure.
• See if the cooling water temperature at inlet changes sharply. Checking the
start and stop of the fan).
• If the chiller refrigerant temperature is low, the chiller 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
procedure shown in Manual Refrigerant Blow Down and Diluting Method on
page 137.
See if the load changes sharply.
See if the refrigerant refining operation has been performed. For the refrigerant
refining method, see NOTE: Do not loosen the bolts around the flange or
remove the disk from the holder. If the disk is removed for any reason, it must
be replaced with a new one! on page 30
Contact your local Johnson Controls Service Office.
COUNTERMEASURE
COUNTERMEASURE
FORM 155.31-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
JOHNSON CONTROLS