JOHNSON CONTROLS
162
FORM 155.31-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
SECTION 8 – TROUBLESHOOTING
VACUUM PUMP
When the Purge Abnormal alarm button lights, the
vacuum pump needs to be disassembled for inspection.
Contact your local Johnson Controls Service Center.
When the Abnormal Purge Freq. alarm button lights
or the vacuum level of the purging line did not reach
the specified level during the vacuum pump capacity,
check to see if the entire purge line needs to be inspect-
ed. See Table 45 on page 162.
TABLE 45 - 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 132. 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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