Table 45 - Vacuum Pump Troubleshooting - York YHAU-CL Series Installation Operation & Maintenance

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
1 Deterioration of vacuum pump oil
2 Wrong operation of purging line switching when
vacuum pump capacity was checked
3
Deterioration of vacuum pump belt
4 Leakage in purge pipe lines
5 Solenoid valve or check valve in the purge line is
160
CAUSE
clogged
COUNTERMEASURE
Replace the vacuum pump oil.
See Purge Procedure on page 130. Confirm the valves are
open or closed.
Contact your local Johnson Controls Service Center.
FORM 155.30-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
JOHNSON CONTROLS