SECTION 8 – TROUBLESHOOTING
FORM 155.32-ICOM2.EN.UL
ISSUE DATE:1/10/2018
166
JOHNSON CONTROLS
VACUUM PUMP
When the Purge Abnormal Alarm lights, the vacuum pump needs to be disassembled for
inspection. Contact your local Johnson Controls Service Center. When the Abnormal Purge
Frequency Alarm lights or the vacuum level of the purging line did not reach the specified
level during the vacuum pump capacity check, the entire purge line needs to be inspected.
See Table 48 on page 160.
Table 54 -
Vacuum Pump Troubleshooting
ABNORMAL SOLUTION AND REFRIGERANT LEVELS
Causes of abnormal levels of solution and refrigerant and countermeasures against them
are shown below. If the level of the solution or refrigerant is abnormal, correct it according
to the following procedure.
Table 55 -
Abnormal Solution and Refrigerant Levels
ITEM
CAUSE
COUNTERMEASURE
1
Deterioration of vacuum pump oil.
Replace the vacuum pump oil.
2
Wrong operation of purging line switching when vacuum
pump capacity was checked.
• Confirm the valves are open or
closed.
3
Deterioration of vacuum pump belt.
• Contact your local Johnson
Controls Service Center.
4
Leakage in purge pipe lines.
5
Solenoid valve or check valve in the purge line is
clogged.
SECTION
NORMAL CONDITION
ABNORMAL
CONDITION
CAUSE
COUNTERMEASURE
Refrigerant
Overflow
(G101)
High temperature of
cooling water inlet
temperature.
• See if the cooling water supply rate is conformed to the
specification. (Check the flow meter, discharge
pressure of the cooling water pump, current, or other
factors that may contribute to the water supply rate.) 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.
• See
Refrigerant Refining Method on page 136
.
• Check the capacity of the vacuum pump.
• Check the purge unit for trouble.
• Purge non--condensable gas from the absorption
chiller-heater.
• 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), see
Refrigerant Refining Method on page
.
Low temperature of
chilled water outlet
temperature.
Cooling water tube
fouling
Purge trouble
Air leakage
Refrigerant
Tank (G102)
Cooling water inlet
temperature is low.
Setpoint error of
automatic start/stop
switch.
• Check cooling water inlet temperature.
• Check the setpoint.
Solution
Tank (G103)
Purging is in
sufficient.
See
Adjusting valve
opening setting error.
Contact your local Johnson Controls Service Center.
Solution is
crystallized.
: Open / : Closed
