Maintenance
When inspecting and maintaining the absorption chiller-heater, observe the following items:
• Never splash water over the electrical parts installed to the control panel and absorption chiller-
heater.
• 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-heater without permission.
• When replacing the oil in the vacuum pump, turn OFF the main circuit breaker (MCB1) in the
control panel.
Exhaust duct inspection
Inspect the exhaust duct periodically to check for a gas leak.
WARNING
If you smell gas, do not operate the machine or manipulate the switches until the gas smell vanishes.
Valve inspection
The chiller-heater is equipped with a refrigerant manual blow valve (VB) that blows refrigerant from
the refrigerant tank to the absorber directly. See Figure 75.
The valve must not be tampered with or have its settings altered. Only touch the valve when daily
maintenance or inspection is required.
WARNING
During service and maintenance work, turn OFF the main circuit breaker (MCCB) and fully close the
main valve of fuel gas line. If not, it can cause electric shock and burn.
CAUTION
Contact your local Johnson Controls Service Office for inspection and maintenance of the unit. Improper
inspection and maintenance can cause a machine malfunction and injury.
Model YHAU-CGN/H-CXR(M)Double Effect Direct Fired Small Absorption Chiller-Heater
144
