JOHNSON CONTROLS
134
FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
SECTION 7 – MAINTENANCE
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 non-condensable gas directly from
the absorber manually according to the following pro-
cedure.
1. Set the valves according to pattern B See
and
.
2. Press the Purge Mode
Manual
button on the Set-
ting screen.
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-~1 kPa.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.
If the pressure decreases when valve V16
opens, the vacuum pump capacity is too
small. Close valve V16 at once. See
7. If no problems are found, open valve V16 the rest
of the way.
Make sure the valve is completely open.
8. Continue to purge for 2 to 3 hours.
9. Close valves 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
from the Purge Tank on page 135
MANUAL METHOD TO PURGE NON-
CONDENSABLE GAS FROM THE PURGE
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 See
and
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 1-2 minutes, confirm that the vacuum gauge
indicates approximately 1 kPa.
5. Verify that valve V10 is open.
6. Reading the vacuum gauge, gradually open valve
V11,
7. The manual purge procedure is complete when
the pressure reaches 3 kPa and below on the vac-
uum gauge.
8. Close valve V11.
9. Press the Purge Pump
OFF
button. The vacuum
pump stops.
For information on how to set up an automatic purge,
Automatic Method to Purge Non-condensable Gas
