Service Manual 24
Diagnosing Cooling Problems
WARNING: The refrigerator cooling system is under
pressure. Do not try to repair or to recharge a defective
cooling system. The cooling system contains sodium
chromate. The breathing of certain chromium com-
pounds can cause cancer. The cooling system
contents can cause severe skin and eye burns, and
can ignite and burn with an intense flame. Do not
bend, drop, weld, move, drill, puncture, or hit the
cooling system.
Make sure the cooling unit has the correct ventilation:
- Make sure that the intake and exhaust vents are not
blocked.
- Make sure that the air flow through the back of the
refrigerator is not decreased or blocked.
- Make sure the ventilation baffle is correctly installed.
Examine the cooling unit for leaks.
WARNING: If you think that the cooling unit has a
leak, do not operate the refrigerator. Replace the
cooling unit before operating the refrigerator.
- If you smell ammonia, the cooling unit has a leak and
must be replaced.
- If you see a yellow powder or residue anywhere at the
rear of the refrigerator or in the enclosure, the cooling unit
has a leak and must be replaced.
Determine if the cooling problem occurs while operating the
refrigerator on propane gas, AC electric, and DC electric:
- Determine if the selected energy source is operating and
heating correctly:
CAUTION: Touch only the outside of the
insulation sleeve. During normal operation,
some tubes of the cooling unit are hot. Do not
touch any tubes of the cooling unit.
- Within 20 minutes of starting the refrigerator, touch
the outside of the insulation sleeve.
- The outside of the insulation sleeve should be warm
to the touch.
- If the outside of the insulation sleeve is not warm, the
selected energy source may not be operating
correctly.
- Start up the refrigerator on a different energy source
and repeat the procedure for all energy sources.
- If the outside of the insulation sleeve is warm to the
touch, make sure the unit is cooling correctly.
- Within one hour after starting up the refrigerator,
touch the fins on the inside of the fresh food com-
partment.
- The fins should feel cold to the touch.
- If the fins do not feel cold to the touch after two hours,
the cooling unit is not operating correctly.
Refrigerator Maintenance
Gas flame appearance:
While in propane gas operation, examine the gas flame:
- Open the lower intake vent.
- Turn the thermostat to “9”.
CAUTION: The burner box cover can be hot. Wear
gloves to avoid burns.
- Open the burner box door [3] and look at the gas flame [1]
(See Art00982 and Art00955).
- The flame should be a darker blue inside and a
lighter blue outside and should be a constant and
steady shape.
- The flame should not be yellow and should not have
an erratic and unstable shape.
- Make sure the flame does not touch the inside of the
flue tube [2].
- Close the burner box door.
Remove and clean the burner orifice:
To remove and clean the burner orifice:
- Close the valve at the propane gas tank(s).
- Close the manual shut of valve of the refrigerator.
- Push the ON/OFF button to stop the refrigerator.
CAUTION: The burner box cover can be hot. Wear
gloves to avoid burns.
- Open the lower intake vent.
- Remove the flare nut from the orifice assembly [1] (See
Art00994).
- Remove the orifice assembly from the burner [2].
WARNING: When cleaning, do not try to remove the
orifice [3] from the orifice adapter [4]. Removal will
damage the orifice and seal of the orifice and can
cause a propane gas leak. Leaking propane gas
can ignite or explode and result in dangerous
personal injury or death. Do not clean the orifice
with a pin or other objects.
- Clean the orifice assembly with air pressure and alcohol
only.
- Using a wrench, assemble the orifice assembly to the
burner.
- Assemble the flare nut to the orifice assembly.
- Examine all of the gas connections for leaks.
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