York YHAU-CW - Insufficient Vacuum Levels; TABLE 47 - Insufficient Vacuum Levels

JOHNSON CONTROLS
164
FORM 155.31-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
SECTION 8 – TROUBLESHOOTING
INSUFFICIENT VACUUM LEVELS
Causes of insufficient vacuum level of purging line and countermeasures against them.
TABLE 47 - INSUFFICIENT VACUUM LEVELS
ITEM CAUSE COUNTERMEASURE
1 Purge pump trouble. Contact your local Johnson Controls Service Ofce.
2 Deterioration of vacuum pump oil. Replace the vacuum pump oil.
3
Wrong operation of purging line switching when
vacuum pump capacity was checked.
• See Purge Procedure on page 132.
• Conrm that the valves are either open or closed.
4 Deterioration of vacuum pump belt.
Contact your local Johnson Controls Service Ofce.
5 Leakage in purge pipe line.
6 Blocked or broken purge solenoid valves.
7 Check valve does not open.
8 Valve V21 left open by mistake.
• See Purge Procedure on page 132.
• Conrm that the valves are either open or closed.