York YHAU-CE-JE Series, Installation Operation & Maintenance

Page: 94 / 136

JOHNSON CONTROLS
94
FORM 155.33-ICOM2.EN.GB
ISSUE DATE: 12/4/2017
SECTION 7 – MAINTENANCE
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 not, the vacuum pump could start
abruptly and cause injury.
TABLE 18 -
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.