JOHNSON CONTROLS
131
SECTION 7 – MAINTENANCE
FORM 155.30-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
7
MANUAL METHOD TO PURGE AIR DIRECTLY
FROM ABSORBER
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,
purge non-condensable gas directly from the absorber
manually according to the following procedure.
1. Set the valves according to pattern B shown in
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. Open valve V16 gradually. Confirm that the pres-
sure on the vacuum gauge increases slightly.
LD19949
EXE Type
EXW2/4ST Type
V16
V11
V14
V16
V11
V14
V11
Purging operating valve for purge tank line
V16
Purging operating valve for absorber line
V14
Purge main valve
FIGURE 58 -
LOCATION OF MANUAL VALVE IN PURGE SYSTEM
NOTE: If the pressure decreases when
valve V16 opens, the vacuum pump capac-
ity is too small. Close valve V16 at once.
See Troubleshooting Performance Issues
on page 159 and check the purge line.
7. If no problems are found, open valve V16 the rest
of the way.
CAUTION: Make sure the valve is com-
pletely open.
8. Continue to purge for 2 to 3 hours.
9. Close valve V13 and V16.
10. Press the Manual Purge
OFF
button. The vacuum
pump stops.
For information on how to set up an automatic purge,
Automatic Method To Purge Non-Condensable Gas
.
