York YHAU-CW - Manual Method to Purge Non-Condensable Gas Directly from Absorber with Vacuum Pump; FIGURE 51 - Location of Manual Valve in Purging System

JOHNSON CONTROLS
133
SECTION 7 – MAINTENANCE
FORM 155.31-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
7
V11 Purging operating valve for purge tank line
V14 Purge main valve
V16 Purging operating valve for absorber line
YHAU-CW(L) 400-2000EX(W)(4)(S)P YHAU-CW(L)150-300EX(S)P
LD19978
V16
V11
V14
V16
V11
V14
FIGURE 51 - LOCATION OF MANUAL VALVE IN PURGING SYSTEM
V11 Purging operating valve for purge tank line
V14 Purge main valve
V16 Purging operating valve for absorber line
MANUAL METHOD TO PURGE NON-
CONDENSABLE GAS DIRECTLY FROM
ABSORBER WITH VACUUM PUMP
When the chiller operates at a lower capacity than usual
for a long period of time or when it restarts after a pow-
er failure, the absorber may contain non-condensable
gases. If the machine starts under these conditions, its
performance and efficiency decrease. If this happens,
manually purge non-condensable gas directly from the
absorber according to the following procedure:
1. Set the valves according to pattern B. See Figure
51 on page 133.
2. Press the Purge Mode MANUAL button.
3. Press the Manual Purge ON button. The vacuum
pump starts. The solenoid valves SV1 and SV2
open.
4. After step 3 begins, confirm that vacuum gauge
stands at 0 ~0.15 PSI.abs.
5. Reading the vacuum gauge, open valve V13.
6. Then, open valve V16 gradually. Confirm that the
pressure on the vacuum gauge increases slightly.