JOHNSON CONTROLS
132
FORM 155.30-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
SECTION 7 – MAINTENANCE
MANUAL METHOD TO PURGE NON-
CONDENSABLE GAS FROM PURGING TANK
While the absorption chiller operates, non-condensable
gas collects in the purging tank. You can purge those
gases manually using the following procedure.
1. Set the valves according to pattern C shown in
Figure 61 on page 149
.
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. 3-4 minutes after the vacuum pump starts, con-
firm that the vacuum gauge stands at 0 ~0.15 PSI
.abs.
5. Verify valve V10 is open.
6. Reading the vacuum gauge, gradually open valve
V11.
7. The manual purge procedure is complete when
the pressure reaches 0.44 PSI.abs or less on the
vacuum 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,
see Automatic Method To Purge Non-Condensable
Gas From Purging Tank on page 132.
AUTOMATIC METHOD TO PURGE NON-
CONDENSABLE GAS FROM PURGING TANK
This chiller has an automatic purge system. The vac-
uum pump starts and stops by detecting the pressure
inside the purge tank.
1. Set the valves in accordance with purge pattern D
shown in Figure 61 on page 149
.
2. Press the Manual Purge OFF button.
3. Press the Purge Mode AUTO button.
4. The purge solenoid valves automatically open and
close.
During the automatic purge operation, the vacuum
pump starts when the purging tank pressure increases
to 1 PSI abs and stops when it decreases to 0.44 PSI
abs.
CAUTION: When you replace the oil in
the vacuum pump or belt or perform main-
tenance work while the absorption chiller
is running, be sure to turn off the circuit
breaker of the vacuum pump in the control
panel. If not, the vacuum pump could start
abruptly and cause injury.
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