York YHAU-CL Series, Установка, эксплуатация и обслуживание

Страница: 130 / 166

JOHNSON CONTROLS
130
FORM 155.30-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
SECTION 7 – MAINTENANCE
START THE CHILLER AFTER IT HAS BEEN
STOPPED FOR A LONG PERIOD
When starting the chiller after stopping it for a long
period, check it according to the following procedure.
When you start the chiller after it has not run for a long
time, use the following procedure.
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 using the
pressure gauge of the generator.
NOTE: The vacuum level should be less
than -145 PSIG. abs.
5. Check the hot water supply manual valve
6. Press the Refrigerant Pump
Stop button.
If the checks show no problems, 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 a while. Check that the
refrigerant liquid level does not drop.
4. Use the procedure shown in Purge Procedure on
page 130 to purge air from the low pressure side
(absorber).
NOTE: Remember: Only deionized wa-
ter may be used as the refrigerant in the
chiller.
PURGE PROCEDURE
Air must be purged from the chiller to maintain its per-
formance and prevent deterioration of its 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. For the purging period, see
Table 29 Figure 60 on page 134138.
CAPACITY CHECK METHOD OF VACUUM
PUMP
For commissioning and regular maintenance, check the
capacity of the vacuum pump first according to the fol-
lowing 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.
NOTE: 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).
CAUTION: If the purge unit is operated
with the gas ballast closed, water is left
in the oil. The oil will need to be replaced
monthly.
4. Set the valves according to pattern A shown in
Figure 60 on page 134 .
5. Press the Purge Mode MANUAL button.
6. Press the Manual Purge
ON
button. The solenoid
valves SV1 and SV2 open, and the vacuum pump
starts.
7. 1-2 minutes after the vacuum pump starts, confirm
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.