Start The Chiller After It Has Been Stopped For A Long Period; Checks Before Operation Starts; Checks After Operation Starts; Purge Procedure - York YHAU-CW Manual

SECTION 7 – MAINTENANCE
START THE CHILLER AFTER IT HAS BEEN
STOPPED FOR A LONG PERIOD
When you start the chiller after it has not run for more
than 15 days, use the procedure below:

Checks Before Operation Starts

1. Check the insulation of the Control Center and
electric system.
2. Check the operation of the Control Center and
safety devices.
3. Check that the refrigerant blow valves V8 are
fully closed.
4. Check the vacuum level in the machine. Use the
pressure gauge of the high temperature generator.
It should be less than -145 PSIG.
5. Check the steam supply system and steam drain
system.
6. Press the Refrigerant Pump Stop button.
If the checks validate, start the chiller.

Checks After Operation Starts

1. 10-15 minutes after the chiller and the solution
pump start, check the level gauge of the refriger-
ant tank.
2. If the refrigerant level is within the level gauge,
press the Refrigerant Pump Auto button.
3. Observe the operation for several minutes. Check
that the refrigerant liquid level does not drop.
4. Use the procedure shown in Purge Procedure on
page 132 to purge air from the low pressure side
(absorber).
Remember: Only deionized water may be
used as the refrigerant in the chiller.
132

PURGE PROCEDURE

Air must be purged from the chiller to maintain peak
performance and prevent deterioration of the internal
parts. This chiller has an automatic purge system.
Even if the automatic purge mode is used during nor-
mal operation, perform the manual operation for the
purging tank and absorber periodically. For the purging
period, see Table 28 on page 139.
CAPACITY CHECK METHOD OF VACUUM
PUMP
For commissioning and regular maintenance, check
the capacity of the vacuum pump first according to the
following procedure.
1. Check the oil level in the vacuum pump.
2. If the oil is cloudy, it contains water and must be
replaced with new oil.
See the Operation Manual for the Vacuum
Pump for more information on how to
change the oil.
3. Open the gas ballast (remove the plug).
If the purge unit is operated with the gas
ballast closed, water is left in the oil. The
oil will need to be replaced approximately
every 6 months.
4. Set the valves according to pattern A. See Figure
51 on page 133.
5. Press the Purge Mode MANUAL button.
6. Press the Manual Purge ON button. The vacuum
pump starts. The solenoid valves SV1 and SV2
open.
7. 1-2 minutes after the vacuum pump starts, con-
firm that the vacuum gauge stands at 0 ~ 0.15 PSI.
abs.
8. Press the Manual Purge OFF button. The vacuum
pump stops.
9. Wait for 30 minutes.
10. Confirm that the vacuum down is within 0.3 PSI.
FORM 155.31-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
JOHNSON CONTROLS