Manual Method To Purge Non-Condensable Gas From Purging Tank With Vacuum Pump; Automatic Method To Purge Non-Condensable Gas From Purging Tank - York YHAU-CW Manual

SECTION 7 – MAINTENANCE
If the pressure decreases when valve V16
opens, the vacuum pump capacity is too
small. Close valve V16 at once. See Table
42 on page 160 and check the purge line
7. If no problems are found, open valve V16 com-
pletely.
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,
see Automatic Method to Purge Non-condensable Gas
from Purging Tank on page 134 .
MANUAL METHOD TO PURGE NON-
CONDENSABLE GAS FROM PURGING TANK
WITH VACUUM PUMP
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 see Figure
51 on page 133 135.
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 that valve V10 is open.
6. Reading the vacuum gauge, gradually open valve
V11.
134
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 134.
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 showw
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.
When you replace the oil in the vacuum
pump or belt or perform maintenance
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.
FORM 155.31-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
JOHNSON CONTROLS