Purge Procedure; Capacity Check Method Of Vacuum Pump - York YHAU-CGN Installation Operation & Maintenance

FORM 155.32-ICOM2.EN.UL
ISSUE DATE:1/10/2018

PURGE PROCEDURE

Air must be purged from the chiller-heater to maintain optimal performance and prevent
deterioration of internal parts. This chiller-heater has an automatic purge system.
Even if the automatic purge mode is used during normal operation, perform the manual
operation for the purging tank and absorber periodically. Purging period time tables must
be examined. See Table 38 on page 140.

CAPACITY CHECK METHOD OF VACUUM PUMP

For commissioning and regular maintenance, check the capacity of the vacuum pump first
according to the following procedure.
1. Check the oil level in the vacuum pump.
2. If the oil is cloudy, it contains water and must be replaced with new oil.
NOTE: See the Operation Manual for the Vacuum Pump for more information on how to
change the oil
3. Open the gas ballast (remove the plug).
CAUTION: If the purge unit is operated with the gas ballast closed, water is left in the
oil. The oil will need to be replaced more frequently.
4. Set the valves according to Pattern A. See
5. Press the Purge Model Manual button on the Setting screen.
6. Press the Manual Purge ON button. The vacuum pump starts. The solenoid valves
SV1 and SV2 open.
7. After another 1-2 minutes, confirm that the vacuum gauge stands at 0
8. Press the Manual Purge OFF button. The vacuum pump stops.
9. Wait for 30 minutes.
10. Confirm that the vacuum down is within 2 kPa.
JOHNSON CONTROLS
Table 36 on page 133.
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SECTION 7 – MAINTENANCE
1 kPa.
123