Solenoid valves
The absorption chiller-heater is equipped with the following solenoid valves.
Table 32: Solenoid valves
Solenoid valve name
Symbol
Function
Purge solenoid valve (1)
SV1
Purge solenoid valve (2)
SV2
Close vacuum pump piping
Solenoid valve of water ejector
SV3
Close the water pipe
Air purge valves and drain valves
The chiller-heater is equipped with air purge valves and drain valves for chilled/hot water and
cooling water. They are used to drain the chilled/hot water, and cooling water. They also purge air
when water is supplied.
Purge valves
The chiller-heater is equipped with the purging valves shown in Figure 75. For operation of those
valves, see
Start the chiller-heater after it has been stopped for a long
period
When starting the chiller-heater after stopping it for a long period, check it according to 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 valve VB is closed.
4. Check the vacuum level in the machine. Use pressure gauge of the high-temperature
generator.
Note:
It must be close to -0.1 MPaG.
5. Check the fuel gas supply.
6. Press the Refrigerant Pump
Stop
button on the setting screen.
If the checks show no problems, start the chiller-heater.
Checks after operation starts
1. 10-15 minutes after the chiller-heater 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.
145
Model YHAU-CGN/H-CXR(M)Double Effect Direct Fired Small Absorption Chiller-Heater
