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JOHNSON CONTROLS
158
FORM 155.31-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
SECTION 8 – TROUBLESHOOTING
TABLE 35 - TROUBLESHOOTING THE HIGH
TEMPERATURE GENERATOR
ITEM CAUSE COUNTERMEASURE
1
Cooling water is Insufficient
or suspended.
• 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.
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 (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 ).
4
Heat exchange tube is
dirty (chilled water, cooling
water).
Contact your local Johnson Controls Service Office.
5 Solution is crystallized.
6 Corrosion inhibitor is worn.
7
Air leaks in absorption
chiller.
TABLE 36 - CHILLED WATER OVERCOOLING OR
REFRIGERANT OVERCOOLED
ITEM CAUSE COUNTERMEASURE
1
Chilled water flow rate
lowers or changes sharply.
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.
2
Cooling water temperature
at inlet changes sharply.
• 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
.
3 Load lowers sharply. See if the load changes sharply.
4
Refrigerant is dirty
(contains solution).
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
5
Heat exchange tube is
dirty (Chilled water).
Contact your local Johnson Controls Service Office.
6
Temperature controller or
safety switch is broken.