Do not touch any part or component displaying a high temperature caution label while the machine
is in operation. This includes the control panel, solution pump, and any piping going to or from the
solution pump.
Periodically inspect the strainers to prevent clogging and incomplete combustion.
Wear protective gloves and goggles when operating the chiller-heater.
Do not operate the machine with panel doors open or removed. Exposure to rainwater or wind
pressure can damage the electrical parts of the unit or cause leakage.
WARNING
During service and maintenance work, be sure to turn OFF the main circuit breaker (MCCB) and follow
all required Lockout and/or Tagout procedures Close the main valve of the fuel gas line. Failure to close
this line may cause electric shock or injury.
If the cables of the solution pump, refrigerant pump, and burner fan are disconnected for service
and maintenance work, check the rotating direction of the pump motor. If not, the chiller-heater
can malfunction.
In case of an accident such as death or serious damage of personnel, turn OFF the circuit breaker
(MCCB) to stop the chiller-heater immediately.
Leak testing
When leak testing, verify the area is correctly ventilated. Failure to do so can result in suffocation.
Electrical shock cautions
Do not touch any switch in the control panel with wet hands; this can cause electric shock.
Do not touch the wiring in the control panel; this can cause electric shock.
Do not touch any part other than the control panel of the machine and the valves described in the
operating manual; this can cause a problem and injury.
Apply the specified source voltage only. Application of a different source voltage can cause a fire
and electric shock.
Welding must be done in certain circumstances only. Be careful not to compromise the integrity of
the vessel. Before welding, verify that the electrical system is grounded correctly. Failure to do this
can result in electrical shock, injury, and/or damage to the chiller-heater.
Do not splash water over the machine and its control panel; this can cause an electric shock.
A warning label for electric shock is pasted at the control panel, solution pump, refrigerant pump,
and the burner fan motor. Before opening the terminal box, stop the chiller-heater and turn OFF
the main circuit breaker (MCCB). If not, it can result in electric shock.
Use of gas
If the smell of gas is present, do not operate the machine, touch the control panel or press any
buttons until the smell of gas vanishes.
Only use the fuel specified on the unit name plate.
Inspect the exhaust duct periodically to check for gas leaks.
If black and white smoke is produced, stop the machine and contact your local Johnson Controls
Service Office for assistance.
Model YHAU-CGN/H-CXR(M)Double Effect Direct Fired Small Absorption Chiller-Heater
28
