Thetford N51 Series 06/05 - 4/13/06 - Manual (Page 10)

Owner’s Manual 10
- Shut down the refrigerator..
- Open the lower intake vent.
- Remove the burner box cover by removing one screw.
WARNING: To avoid possible propane gas leaks,
always use two wrenches to loosen and tighten the gas
supply line at the refrigerator’s manual shut off valve.
- Remove the flare nut from the orifice assembly [1] (See
Art00956).
- Remove the orifice assembly from the burner [2].
WARNING: Do not try to remove the orifice [3] from
the orifice adapter [4] when cleaning. Removal will
damage the orifice and seal of the orifice and can
cause a propane gas leak. Leaking propane gas can
ignite or explode which can 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.
- Tighten the flare nut by hand.
- Hold the orifice assembly securely and, using a
wrench, tighten the flare nut 1/4 revolution only.
- Examine all of the connections for gas leaks.
Fuse Replacement
(N510 models only)
The electrical circuits of this refrigerator have fuses to protect
them from an overload. If the fault codes show that a fuse is
unservicable, replace it as follows.
WARNING: Do not operate the refrigerator without the
power board cover on the refrigerator. To prevent a circuit
overload and a possible electrical fire, use only these
fuses:
DC control circuit - 5 amp (purple) blade type automotive
fuse
DC heater circuit - 30 amp (green) blade type automotive
fuse
AC circuit - 5 amp glass cartridge fuse
1. Push the ON/OFF button to shut down the refrigerator.
2. Remove the black AC power cord from the receptacle.
3. Remove the AC power cord from the power board that is at
the rear of the refrigerator.
Refrigerator Maintenance
Gas flame appearance:
While in propane gas operation, examine the appearance of the
gas flame:
- Turn the thermostat to the 5 position.
- Open the lower intake vent.
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 Art00955 and Art00975).
- The flame should be a darker blue inside and a lighter
blue outside and should be a constant and steady
shape.
- If the flame is yellow or has an erratic and unstable
shape, contact your dealer or an authorized Norcold
Service Center.
- Make sure the flame does not touch the inside of the
flue tube [2].
- If the flame touches the inside of the flue tube, contact
your dealer or an authorized Norcold Service Center.
- Close the burner box door.
Remove and clean the burner orifice:
NOTE: Your dealer or an authorized Norcold Service Center
must do this procedure.
To remove and clean the burner orifice:
- Close the valve at the propane gas tank(s).
- Close the manual shut off valve of the refrigerator.
- Make sure the electrode spark gap [3] is 1/8 - 3/16 inch
(See Art00955).
- Adjust if needed.
- Make sure the AC and DC voltages are correct.
- Adjust if needed.
- Make sure the thermocouple tip is clean and secure.
- Make sure the area at the rear of the refrigerator is free of
any combustible materials, gasoline, and other flammable
vapors and liquids.