62-11785 1–4
Only a refrigerant cylinder containing R404A should be connected to this refrigeration unit in
order to pressurize the system. However, dry nitrogen may be used to increase pressure. Any
other gas or vapor will contaminate the system and require additional removal and evacuation.
Do not use a nitrogen cylinder without a pressure regulator. Cylinder pressure is
approximately 2350 psig (159.9 bar). Do not use oxygen in or near a refrigerant system as an
explosion may occur. (See Figure 8.15)
Before removal of the compressor, relieve the internal pressure by very carefully loosening the
couplings to break the seal.
Service Mode MUST be used whenever removing refrigerant charge, refrigerant leak checking
or evacuating.
Before connecting a megohmmeter, place the Main Power switch in the OFF position.
Disconnect the high voltage source, lockout/tagout the receptacle and disconnect the negative
battery connection. Isolate the microprocessor by disconnecting all connectors and wires
going to it. Observe National Electric Manufacturer’s Association (NEMA) rules and test
equipment manufacturers instructions.
Electronic modules MUST be handled with care to prevent accidental damage or degradation
from electrostatic discharge (ESD), contamination or abuse. Before touching a module, touch
your body and/or conductive tool being used to the frame to discharge ESD safely. All
electronics should be handled carefully and only held by edges of any exposed board. Care
should be taken when inserting/extracting connectors and components to avoid exerting
excessive stress on the board which could fracture small components nearby, resulting in
future failure of circuit.
Under no circumstances should a technician electrically probe the modules at any point, other
than the connector terminals where the harness attaches. Module components operate at
different voltage levels and at extremely low current levels. Improper use of voltmeters, jumper
wires, continuity testers, etc. could permanently damage the module.
Technician Mode should be canceled when work is complete. If Technician Mode is not
canceled, Technician Mode will be available for 60 minutes after the last key press without
requiring a code, even after placing the SROS in the OFF and then back in the RUN/STOP
position.
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