JOHNSON CONTROLS
156
FORM 155.30-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 matches the specification.
•
Check the flow meter, discharge pressure of the cooling water pump, current,
and other relevant pumps.
•
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 of absorption chiller is
high
Check the capacity of the cooling tower.
3
Hot water temperature at inlet
of absorption chiller is high
Check the hot water inlet temperature. If it is higher than the specification, change
the set temperature to the specification.
4
Non-condensable gas stays in
machine
• See
• Check the capacity of the vacuum pump.
• Check the purge unit for trouble.
• Purge air from the absorption chiller.
•
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).
5
Heat exchange tube is dirty
(Chilled water, cooling water)
Contact your local Johnson Controls Service Office.
6
Solution is crystallized
7
Corrosion inhibitor is worn
8
Air leaks in absorption chiller
TABLE 36 -
CHILLED WATER OVERCOOLING OR REFRIGERATION OVERCOOLED
ITEM
CAUSE
COUNTERMEASURE
1
Chilled water flow rate lowers
or changes sharply
See if the chilled water flow rate changes suddenly (particularly in the case
of variable flow rate specification). If it changes suddenly, 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 (by checking start
and stop of the fan). If the chilled water or the refrigerant temperature is low,
the chiller stops immediately but does not perform the dilution operation. If left
as is, the solution will crystallize in 4-5 hours. To prevent this, dilute the solution
according to the procedure shown in
Manual Refrigerant Blowdown and Diluting
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 periodically. For the
refrigerant refining method, see
Refrigerant Refining Method on page 135
.
5
Heat exchange tube is dirty
(Chilled water)
Contact your local Johnson Controls Service Office.
6
Temperature controller or
safety switch is broken
