JOHNSON CONTROLS
135
SECTION 7 – MAINTENANCE
FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
7
AUTOMATIC METHOD TO PURGE NON-
CONDENSABLE GAS FROM THE PURGE
TANK
This chiller-heater has an automatic purge system. The
vacuum pump starts and stops by detecting the pressure
inside the purge tank.
1. Set the valve according to pattern D. See Figure
58 on page 140 and Table 25 on page 112.
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 7 kPa abs and stops when it decreases to 3 kPa abs.
When you replace the oil in the vacuum
pump or belt or perform maintenance
work while the absorption chiller-heater
is running, be sure to turn off the circuit
breaker of the vacuum pump in the con-
trol panel. If not, the vacuum pump could
start abruptly and cause injury.
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