York YHAU-CE, Установка, эксплуатация и обслуживание, Страница: 90 / 136

JOHNSON CONTROLS
90
FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
SECTION 7 – MAINTENANCE
Automatic Method to Purge Non-condensable
Gas from Purging Tank
This chiller-heater has an automatic purge system. The
vacuum pump automatically starts and stops by detect-
ing the pressure inside the purge tank.
1. Set the valves in accordance with the purge pat-
tern D shown in Table 19 on page 90 .
2. Navigate to the Control Panel Setting screen.
3. Press the Manual Purge
OFF button.
4. Press the Purge Mode AUTO button.
5. The vacuum pump automatically starts and stops.
TABLE 19 - PURGE VALVE OPERATION
PURGING
PATTERN
USE OPERATION
VALVE OPERATION AND LOCATION
V18 V19 V20 V16 V17
A
Check capacity of vacuum pump – x × × ×
B Direct purging from absorber
Preparation x × ×
Starting purging x ×
C Manual purging from purging tank
Preparation × × ×
Starting purging × ×
D Automatic purge of the purging tank × ×
: Open valve. X: Closed valve.
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 control
panel. If the unit is not turned off, the
vacuum pump could start abruptly and
cause injury.