Maintenance
When inspecting and maintaining the absorption chiller, observe the following items:
• Never splash water over the electrical parts installed to the control panel and absorption chiller.
• Do not change the set values of the control devices and safety switches without permission.
• Do not turn the internal cycle control valve of the absorption chiller without permission.
• When replacing the oil in the vacuum pump, turn OFF the main circuit breaker (MCCB) in the
control panel.
Valve inspection
The chiller is equipped with a refrigerant manual blow valve (V8) that blows refrigerant from the
refrigerant tank to the absorber directly. See Figure 69.
The valve must not be tampered with or the settings changed. An exception is daily maintenance
and inspection.
WARNING
During service and maintenance work, turn OFF the main circuit breaker (MCCB) and fully close the
main valve of the steam line. Failure to do so can cause electric shock and burn.
CAUTION
Contact your local Johnson Controls Service Office for inspection and maintenance of the machine.
Improper inspection and maintenance can cause a machine problem and also injure workers.
Solenoid valves
The absorption chiller is equipped with the following solenoid valves.
Table 26: Solenoid valves
Solenoid valve name Symbol Function
Purge solenoid valve (1) SV1
Purge solenoid valve (2) SV2
Close vacuum pump piping
Refrigerant blow solenoid valve SV3 Close automatic refrigerant blow piping
Pump shut off valves
The chiller is equipped with the pump shut off valves shown in Figure 69 and Figure 70. They are
used for inspection of the pumps.
If the absorption chiller is operated with incorrect valve settings, the pump can be damaged. Do not
tamper with the valves.
YHAU-C Single Effect Steam-Fired Absorption Chiller142
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