York YHAU-CGH, Installation Operation & Maintenance

Page: 167 / 182

FORM 155.32-ICOM2.EN.UL SECTION 8 – TROUBLESHOOTING
ISSUE DATE:1/10/2018
JOHNSON CONTROLS 167
Causes of insufficient vacuum level of the purge line and countermeasure against
insufficient vacuum levels.
Table 56 - Insufficient Vacuum Levels
ITEM CAUSE COUNTERMEASURE
1 Purge pump trouble.
Contact your local Johnson Controls
Service Office.
2 Deterioration of vacuum pump oil. Replace the vacuum pump oil.
3
Wrong operation of purging line switching
when the vacuum pump capacity was
checked.
• See Refrigerant Refining Method on
page 136 .
• Confirm that the valve is open or
closed.
4 Deterioration of the vacuum pump belt.
Contact your local Johnson Controls
Service Office.
5 Leakage in purge pipe line.
6
Blocked or dysfunctional purge solenoid
valves.
7 Check valve does not open.
8 Valve V21 mistakenly open.
• See Refrigerant Refining Method on
page 136 .
• Confirm that the valve is open or
closed.