Problem
Preventative measure
Freezing of
refrigerant in
machine
Store the machine where the ambient temperature is higher than 0°C. If the
ambient temperature drops lower than 0°C, use a heater to warm the machine.
If a heater is not accessible, the following options are available to prevent
freezing:
• Extraction of the refrigerant
• Addition of antifreeze to the refrigerant
• Installation of a band heater
For further instruction, contact your nearest authorized Johnson Controls
Service Center.
External damage
Avoid storing the machine in a place that is easily accessible or near a
construction site. If this is unavoidable, use diligence to protect the machine.
If the machine can not be protected fill the interior with N
2
. This possibly
minimizes the amount of air leakage in the event of damage to the machine.
This method requires purging during machine operation and is effective in
preventing corrosion of the machine interior. For further information on the
sealing with N
2
option, contact your nearest authorized Johnson Controls
Service Center.
Soot and dust
To protect the machine from soot and dust, or other air particles, cover the
entire machine, including the control panel, instruments and gauges located
on top of the machine with a vinyl sheet. Use caution not to apply too much
pressure to the controls to prevent damage.
Rainwater
Avoid storing the machine in areas that are exposed to rainwater or other
standing water.
Humidity
Ventilate the storage area to keep the humidity low. Silica gel can be effectively
used to dehumidify the control panel and other machine parts.
Note:
When the Silica gel absorbs moisture it can corrode electrical parts. It is important
to replace this gel every six months. Always avoid storing the machine in areas where the
humidity is 95% RH or higher, and the temperature is 104°F (40°C) or higher.
• Periodic inspection and maintenance
a. Inspect the machine weekly for damage.
b. Check the machine compound gauge daily to verify that there is no decline in vacuum and
record the vacuum value (0 mmHg to 40 mmHg [-0.1 MPa to -0.095 MPa]). If the vacuum
is below the low limit, contact your nearest authorized Johnson Controls Service Center
immediately.
c. If the vacuum has dropped as a result of improper machine operation, contact your
nearest authorized Johnson Controls Service Center immediately.
Model YHAU-CGN/H-CXR(M)Double Effect Direct Fired Small Absorption Chiller-Heater
22
