Carrier X4 7300 Operation & Service Manual page 19

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.
Under no circumstances should a techni-
cian electrically probe the modules at any
point, other than the connector terminals
where the harness attaches. Module com-
ponents operate at different voltage lev-
els and at extremely low current levels.
Improper use of voltmeters, jumper
wires, continuity testers, etc. could per-
manently damage the module.
Electronic modules MUST be handled
with care to prevent accidental damage
or degradation from electrical static dis-
charge (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 insert-
ing/extracting connectors and compo-
nents to avoid exerting excessive stress
on the board which could fracture small
components nearby, resulting in future
failure of circuit.
Ensure that the clock you are using is
accurate. Also, some customers are
located in different time zones from the
repair location. If you know the owners
desired location time, enter that time. If
you don't, enter the current time at your
location.
DO NOT leave the air intake circuit ener-
gized for the full 5 minutes if full amper-
age is shown, as the intake air heater
element life will be greatly shortened.
62-11637
Unit uses R404A and POE oil. The use of
inert gas brazing procedures is manda-
tory for all Carrier Transicold refrigera-
tion units; otherwise compressor failure
will occur. For more information Refer to
Technical Procedure 98-50553-00 Inert
Gas Brazing.
Running the engine for an extended
period of time with the manual plunger up
can cause a priming pump failure.
Torque fuel level sensor mounting
screws to 15 to 18 inch/lbs (1.7 to 2.0
Nm). DO NOT over tighten, as little as 20
inch/pounds (2.3 Nm) will damage the
sensor.
When changing oil filter, the new filter
should be primed (partially filled) with
clean oil if possible. If the filter is not
primed, the engine may operate for a
period with no oil supplied to the bear-
ings.
Use only ethylene glycol anti-freeze (with
inhibitors) in system as glycol by itself
will damage the cooling system. Always
add pre-mixed 50/50 anti-freeze and water
to radiator / engine. Never exceed more
than a 60% concentration of anti-freeze.
Use a low silicate anti-freeze meeting GM
specifications GM 6038M for standard life
coolant or use Texaco Havoline extended
life coolant or any other extended life
coolant which is Dexcool approved and
has 5/150 (5 years / 150,000 miles) on the
label.
NEVER POUR COLD WATER INTO A HOT
ENGINE, however hot water can always
be added to a cold engine.
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