When installing the unit indoors, have a specialized company provide a suitable flue/smokestack
and air supply/exhaust equipment. Insufficient air supply or improper exhaust can cause oxygen
starvation and a fire. The interlock of the control panel must be set up with a supply/exhaust fan to
create a proper draft.
CAUTION
Do not install a chimney near the air supply.
Electrical
The electrical work must be performed in accordance with the wiring diagrams, delivery
specifications, and technical standards for electrical equipment found in
. Use the
specified cables to complete the wiring, and fasten them to the according terminals securely. Loose
fitting cables can cause the terminals to heat up, resulting in fire or electrical shock. Electrical work
must be supervised or completed by a Johnson Controls Service Representative.
Note:
A ground fault (earth leakage) circuit breaker is not installed for this chiller-heater unit.
Install an adequate ground fault circuit breaker at the primary side of the chiller-heater unit.
Precautions for use
Ventilate the storage area as much as possible to keep the humidity low. Avoid storing the unit in
an area where the humidity is 95% RH or higher, and the temperature is 40°C (104°F) or higher. For
more information about long term-storage, refer to
Long-term Storage Requirements (Form 50.20-
NM1)
and
Long-term Storage Checklist (Form 50.20-CL4).
Silica gel can be used on a temporary basis to dehumidify the control panel, but must be removed
when the moisture is absorbed. Otherwise, the silica gel can corrode the electrical parts of the
control panel.
Do not allow negative pressure or any devices that create negative pressure to operate in the area
around the chiller-heater. This can cause incomplete combustion, resulting in gas inhalation and
hypoxia.
To prevent injuries, do not put a finger, a rod, or anything else into any rotary parts of the burner
motor.
Do not place anything heavy on the machine or its control panel; it can fall and injure a worker.
Do not climb up the unit without safety harnessing.
Contact your local Johnson Controls service office for inspection and maintenance of the unit.
Improper inspection and maintenance can cause a machine problem, and can also injure workers.
Keep the chilled/hot water and cooling water under the maximum usage pressure. If they exceed
the maximum usage pressure, they can spout or leak and can cause an electric leak and a burn.
Do not change the set values of the safety devices and protective devices. Operation with incorrect
set values can cause a problem.
In the event that the circuit breaker or disconnect switch is activated, eliminate the cause of the
problem before restarting the unit. See
.
Verify the main valve for the fuel gas is closed before servicing the chiller-heater. Only a Johnson
Controls service representative can modify the main gas valve or any of the fuel control devices
after the chiller-heater has been serviced. Operation of the chiller-heater by an inexperienced
person could result in incomplete combustion, fire, or injury.
27
Model YHAU-CGN/H-CXR(M)Double Effect Direct Fired Small Absorption Chiller-Heater
