JOHNSON CONTROLS
170
FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
SECTION 8 – TROUBLESHOOTING
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 vacu-
um level of the purging line did not reach the speci-
fied level during the vacuum pump capacity check,
the whole of the purge line needs to be inspected. See
.
TABLE 52 -
VACUUM PUMP TROUBLESHOOTING
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
