Air purge valves and drain valves for chilled water, and
cooling water
The chiller is equipped with air purge valves and drain valves for chilled water and cooling water.
It is equipped with a drain valve for the steam condensate (drain). These valves are used to drain
the chilled water, cooling water, and steam condensate (drain). They also purge air when water is
supplied.
Purge valves
The chiller is equipped with the purging valves shown in Figure 69 and Figure 70. For operation of
those valves, see Purge procedure.
Starting 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 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. Use the pressure gauge of the generator.
5. Check the steam supply.
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
refrigerant 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 to purge air from the low pressure side
(absorber).
Note: Only use deionized water as the refrigerant in the chiller.
Purge procedure
Air must be purged from the chiller to maintain its performance and prevent deterioration of its
internal parts. This chiller has an automatic purge system.
Even if the automatic purge mode is used during normal operation, perform the manual operation
for the purging tank and absorber periodically.
143YHAU-C Single Effect Steam-Fired Absorption Chiller
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