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 42 on page 167.
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.
• See Purge Procedure on page 130
• Conrm 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
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