Manual Method To Purge Non-Condensable Gas Directly From Absorber; Manual Method To Purge Non-Condensable Gas From Purging Tank; Automatic Method To Purge Non-Condensable Gas From Purging Tank - York YHAU-CE-JE Series Installation Operation & Maintenance

FORM 155.33-ICOM2.EN.GB
ISSUE DATE:12/4/2017
MANUAL METHOD TO PURGE NON-
CONDENSABLE GAS DIRECTLY FROM
ABSORBER
When the chiller-heater operates at a lower capacity
than usual for a long period of time or when it restarts
after a power failure, the absorber may contain non-
condensable gases. If the machine starts under these
conditions, its performance and efficiency go down. If
this happens, purge air directly from the absorber man-
ually according to the following procedure.
1. Set the valves according to pattern B shown in
Table 18 on page 94.
2. Navigate to the Control Panel Setting screen.
3. Press the Purge Mode Manual button.
4. Press the Manual Purge ON button. The vacuum
pump starts and the solenoid valves SV1 and SV2
open.
5. After 1-2 minutes, confirm that the vacuum gauge
stands at 0~1 kPa.
6. Reading the vacuum gauge, open valve V17 grad-
ually. Confirm that the pressure on the vacuum
gauge increases slightly.
If the pressure decreases when valve V17
opens, the vacuum pump capacity is too
small. Close valve V17 at once. Check the
purge line.
7. If no problems are found, open valve V17.
Make sure the valve is completely open.
8. Continue the purge for 2 to 3 hours.
9. Close valve V17.
10. Press the Manual Purge OFF button. The vacuum
pump stops and the solenoid valves close.
JOHNSON CONTROLS
MANUAL METHOD TO PURGE NON-
CONDENSABLE GAS FROM PURGING TANK
While the absorption chiller-heater operates, non-
condensable gas collects in the purging tank. You can
purge those gases manually using the following pro-
cedure.
1. Set the valves according to pattern C shown in
Table 18 on page 94.
2. Navigate to the Control Panel Setting screen.
3. Press the Purge Mode Manual button.
4. Press the Manual Purge ON button. The vacuum
pump starts and the solenoid valves SV1 and SV2
open.
5. 3-4 minutes after the vacuum pump starts, con-
firm that the vacuum gauge stands at 0~1 kPa.
6. Reading the vacuum gauge, gradually open valve
V19.
7. The manual purge procedure is complete when
the pressure reaches 3 kPa and or less on the vac-
uum gauge.
8. Close valve V19.
9. Press the Manual Purge OFF button. The vacuum
pump stops and the solenoid valves close.
AUTOMATIC METHOD TO PURGE NON-
CONDENSABLE GAS FROM PURGING TANK
This chiller-heater has an automatic purge system. The
vacuum pump automatically starts and stops by detect-
ing the pressure inside the purge tank.
1. Set the valves in accordance with the purge pat-
tern D shown in Table 18 on page 94.
2. Navigate to the Control Panel Setting screen.
3. Press the Manual Purge OFF button.
4. Press the Purge Mode Auto button.
5. The vacuum pump automatically starts and stops.
SECTION 7 – MAINTENANCE
93
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