JOHNSON CONTROLS
160
FORM 155.30-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
SECTION 8 – TROUBLESHOOTING
VACUUM PUMP
When the Purge Abnormal button lights on the Fail-
ure and Alarm screen, the vacuum pump needs to be
disassembled for inspection. Contact your local John-
son Controls Service Center. The entire purge line must
be inspected if the Abnormal Purge Freq. button on
the same screen lights, or if the vacuum level of the
purge line does not reach the specified level during the
vacuum pump capacity check.
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 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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