MCC EM-1 - Page 3

Safety - 2
© 2012 Mobile Climate Control T-299 Rev. 08/2012
Do not bypass any electrical safety devices, e.g. bridging an overload, or using any sort of jumper wires.
Problems with the system should be diagnosed, and any necessary repairs performed, by qualified service
personnel.
When performing any arc welding on the vehicle, disconnect the vehicle battery.
In case of electrical fire, extinguish with CO
2
(never u se water). Disconnect vehicle b attery power if po ssible.
SPECIFIC WARNINGS
WARNING
Beware of unannounced starting of the evaporator and condenser fans. The unit may cycle the
fans and compressor unexpectedly as control requirements dictate.
WARNING
Be sure to observe warnings listed in the safety summary in the front of this manual before per
forming maintenance on the air conditioning system
WARNING
Never use air for leak testing. It has been determined that pressurized, air-rich mixtures of re
frigerants and air can undergo combustion when exposed to an ignition source.
WARNING
Do not use a nitrogen cylinder without a pressure regulator. Do not use oxygen in or near a
refrigeration system or as an explosion may occur.
WARNING
To prevent trapping liquid refrigerant in the manifold gauge set be sure set is brought to suc
tion pressure before disconnecting.
WARNING
There may be liquid refrigerant trapped behind the block valve. Slowly loosen the fitting and avoid
contact with exposed skin or eyes.
WARNING
The filter-drier may contain liquid refrigerant. Slowly open the fitting nuts and avoid contact with
exposed skin or eyes.
CAUTION
Unless there was a catastrophic failure, such as a blown or ruptured refrigerant hose, additional
oil may not be needed.