Thetford N301 User manual

Part No. 631509C (01-02-12)
Thetford Australia
41 Lara Way
Campbellfield Vic 3061
Service Manual
For Australian refrigerator models:
N301 (93 liter 2-way operation with propane gas or 240 volts AC)
N301.3 (93 liter 3-way operation with propane gas, 240 volts AC, or 12 volts DC )
Thetford Customer Service
Telephone: [phone]
Fax: [phone]
Web Site: www.thetford.com.au
Table of Contents
Introduction.....................................................................2
Safety Awareness...........................................................2
Safety Instructions..........................................................2
Specifications .................................................................3
Operating limits ........................................................3
Ratings.....................................................................3
Current draws ..........................................................3
Replacement fuses ..................................................3
Ventilation Requirements ...............................................3
Propane Gas Components.............................................4
Examine the gas supply system for leaks................4
Electrical Components....................................................4
Examine the 240 volts AC supply ............................4
Examine the 12 volt DC supply (3-way models )......4
Controls ..........................................................................5
Ignition and Start Up.......................................................5
Ignition - propane gas operation ..............................5
Start up - AC electric operation................................5
Start up - DC electric operation (3-way models) ......5
Shut down ................................................................5
Battery drain.............................................................6
Refrigerator Maintenance...............................................6
Gas flame appearance.............................................6
Remove and clean the burner orifice .......................6
Diagnosing Cooling Problems ........................................6
Wiring Pictorial................................................................7
Troubleshooting..............................................................8
Replacement Instructions.............................................11
Selector switch ............................................................11
Thermostat ...................................................................11
AC heater...............................................................11
DC heater (3-way models) .....................................11
Thermocouple ........................................................12
Thermocouple interrupter.......................................12
Safety valve ...........................................................12
Refrigerator ............................................................12

2 - Service Manual N301 Model
Safety Instructions
Introduction
This Service Manual supplies information for the experienced
repair technician. The repair technician should have working
knowledge of the operation of an absorption refrigerator sys-
tem and should have basic knowledge of LP gas and electrical
systems.
Read and understand the “Installation and Owner’s Manual”,
all service procedures, cautions and warnings before doing any
service work on the refrigerator. If you are unable to resolve
the problem by using this Service Manual, technical service
support is available at (61) 03-9358-0700.
Only use genuine Thetford replacement parts on the refrigera-
tor. Generic parts do not meet Thetford’s specifications for
reliability, performance, and safety and will void the Thetford
Limited Warranty.
Safety Awareness
Read this manual carefully and understand the contents before
you install and operate the refrigerator.
Be aware of possible safety hazards when you see the safety
alert symbol on the refrigerator and in this manual. A signal
word follows the safety alert symbol and identifies the danger
of the hazard. Carefully read the descriptions of these signal
words to fully know their meanings. They are for your safety.
WARNING: This signal word identifies a
hazard, which if ignored, can cause serious per-
sonal injury, death, or much property damage.
CAUTION: This signal word identifies a haz-
ard, which if ignored, can cause small personal
injury or much property damage.
!
WARNING:
■This refrigerator is equipped to use only propane gas
and can not be changed to use any other fuels (natural
gas, butane, etc.).
■Incorrect installation, adjustment, changes to, or main-
tenance of this refrigerator can cause personal injury,
property damage, or both.
■Obey the instructions in this manual when installing the
intake and exhaust vents.
■Do not install the refrigerator directly on carpet. Put the
refrigerator on a metal or wood panel that extends the
full width and depth of the refrigerator.
■Propane gas can cause a fire or an explosion that can
result in property damage, personal injury, or death. Do
not smoke or create sparks while doing any work on the
propane gas supply system. Do not use an open flame
to examine the gas supply piping or fittings for leaks.
■To avoid possible propane gas leaks, always use two
wrenches to tighten or loosen the gas supply line con-
nections.
■Make sure the electrical installation conforms to all
applicable codes. See the “Certification and Code
Requirements” section of the “Installation and Owner’s
Manual”.
■Disconnect both the AC and DC power sources before
doing any maintenance work on the refrigerator.
■Do not bypass or change the refrigerator’s electrical
components or features.
■Do not spray liquids near electrical outlets, connections,
or the refrigerator components. Many liquids conduct
electricity which can cause a shock hazard, electrical
shorts, and in some cases fire.
■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.
Breathing certain chromium compounds can cause can-
cer. 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.
■Storing flammable materials behind or around the refrig-
erator creates a fire hazard. Do not use the area behind
the refrigerator to store flammable materials (e.g. gaso-
line and cleaning supplies)
■Do not remove the round ground prong from the refrig-
erator AC power cord. Do not use a two prong adapter
or extension cord on the AC power cord.
■A circuit overload can result in an electrical fire if
the wires and/or fuse sizes are not correct. Use only
the wire and fuse sizes listed in the “Installation and
Owner’s Manual”.
■To prevent child entrapment, make sure all shelf retain-
ers are correctly fastened and remove the doors before
disposing of the refrigerator.
CAUTION:
■The rear of the refrigerator has sharp edges and cor-
ners. To prevent cuts or abrasions when working on the
refrigerator, be careful and wear cut resistant gloves.
■Make sure all fasteners and connections are tight.
!
!
!

Service Manual N301 Model - 3
Specifications
Operating limits
AC Operation: 216 VAC Min. - 264 VAC Max.
DC Operation: 11.5 VDC Min. - 15.4 VDC Max.
(3-way models)
Propane Gas 2.6 kPa Min. - 2.7 kPa Max.
Operation
Ratings
AC Operation: 240 Volts AC, 180 Watts
DC Operation: 14 Volts DC, 150 Watts
(3-way models)
Propane Gas 1.0 MJ per Hr Input
Operation: 2.7kPa Gas Supply
No. 10 Orifice (LP10)
Current draws
AC Heater: .75 Amps @ 240 VAC
Resistance 298 Ohms
DC Heater 12 Amps @ 14 VDC
Resistance 1.3 Ohms
Replacement fuses
AC Circuit 3 Amp Type 3AG (31.75mm x
6.35mm)
DC Circuit: 20 Amp Type 3AG (31.75mm x
6.35mm)
Ventilation Requirements
WARNING: The completed installation must:
■provide sufficient intake of fresh air for combustion.
■ensure the living space is completely isolated from the
combustion system of the refrigerator.
■provide complete and unrestricted ventilation of the
flue exhaust which, in gas mode, can produce carbon
monoxide. Breathing carbon monoxide fumes can cause
dizziness, nausea, or in extreme cases, death.
Certified installation requires one lower intake vent and one
upper exhaust vent. Install the vents through the side wall
of the vehicle exactly as instructed in this manual. Any other
installation method voids both the certification and the factory
warranty of the refrigerator.
The bottom of the opening for the lower intake vent, which is
also the service access door, must be even with or immediately
below the floor level. This allows any leaking LP gas to escape
to the outside and not to collect at floor level.
Australian Gas Association (AGA) certification allows the re-
frigerator to have zero (0) mm minimum clearance at the sides,
rear, top, and bottom. While there are no maximum clearances
specified for certification, the following maximum clearances
are necessary for correct refrigeration:
Bottom 0 mm min. 0 mm max.
Each Side 0 mm min 3 mm max.
Top 0 mm min. 6 mm max.
Rear 0 mm min. 25 mm max.
These clearances, plus the lower and upper vents, cause the
natural air draft that is necessary for proper refrigeration. Cool-
er air goes in through the lower intake vent, passes through
the refrigerator coils where it removes the excess heat from the
refrigerator components, and exits through the upper exhaust
vent. If this air flow is blocked or decreased, the refrigerator
may not cool correctly.
Each Thetford model is certified by AGA for correct ventilation.
!

4 - Service Manual N301 Model
This refrigerator operates on propane gas at a pressure of 2.6
kPa min. to 2.7 kPa max.
WARNING: Be very careful when working on
or near the propane gas system.
■Do not smoke, or use an open flame near the propane
gas system.
■Do not use an open flame to look for leaks.
■Do not connect the refrigerator to the propane gas tank
without a pressure regulator between them.
■To avoid possible propane gas leaks, always use two
wrenches to tighten or loosen the gas supply line con-
nections.
■Leaking propane gas can ignite or explode and result in
serious personal injury or death.
Examine the gas supply system for leaks
WARNING: Do not allow the leak detecting
solution to touch the electrical components.
Many liquids conduct electricity which can cause
a shock hazard, electrical shorts, and in some
cases fire.
Using a solution of liquid detergent and water, make sure that
there are no leaks in the gas supply line or in any gas connec-
tions. Do not use any liquid that contains ammonia.
If you pressurize the system with compressed air, the following
applies:
■The pressure of the compressed air at the manual
shutoff valve of the refrigerator must not be more than
3.5 kPa.
■If the pressure of the compressed air is more than 3.5
kPa, remove the gas supply line from the manual shutoff
valve of the refrigerator before testing.
■If the pressure of the compressed air is equal to or less
than 3.5 kPa, close the manual shutoff valve of the
refrigerator before testing.
Propane Gas Components
This refrigerator operates on these electrical sources.
AC Operation 240 volts AC voltage
(216 volts min. - 264 volts max.)
DC Operation 14 volts DC voltage
(3-way models) (11.5 volts min. - 15.4 volts max.)
Operation outside of these limits may damage the refrigerator’s
electrical circuitry and will void the warranty.
Examine the 240 volts AC supply
WARNING: Connect the AC power cord only
to a grounded three-prong receptacle. Do not
remove the round ground prong from the power
cord. Do not use a two-prong adapter or an ex-
tension cord. Operating the refrigerator without a
correct ground could cause dangerous electrical
shock or death if you touch the metal parts of
the refrigerator or the vehicle.
■Make sure the AC power cord is in a grounded three-
prong receptacle.
■Make sure the receptacle is within easy reach of the
lower intake vent.
■Make sure the power cord does not touch the burner
cover, the flue pipe, or any hot component that could
damage the power cord’s insulation.
Examine the 12 volt DC supply (3-way models)
The refrigerator gets power from the 12 volt system of the
vehicle; either from the battery or from an auxiliary (house)
battery. The battery system not only supplies DC power to the
refrigerator, but also to other components of the vehicle.
The DC heating element, which supplies power for cooling dur-
ing DC operation, has a high current draw and can cause rapid
battery drain.
Make sure the 12 volt DC supply is connected correctly by
checking that:
■the DC negative wire from the battery is connected to
the DC wire to the refrigerator.
■the DC positive wire from the battery is connected to the
DC wire to the refrigerator.
■an in-line fuse is installed on the DC positive wire, as
near the battery as possible, between the battery and
the lead wire of the refrigerator
NOTE: This in-line fuse is necessary for added safety,
even though the refrigerator has a DC fuse in
the control assembly.
Electrical Components
!
!
!

Service Manual N301 Model - 5
The thermostat [1] changes the amount of propane gas that
goes to the burner (see Figure 1). This acts as the tempera-
ture control of the refrigerator. Number 5 is the coldest tem-
perature setting.
NOTE: The thermostat is not an automatic gas control. It
does not automatically change the flame from high
fire to low fire as do other RV refrigerators. If the
cooling load changes, you must manually change the
gas control to maintain the same temperature inside
the refrigerator.
When the outside air temperature is less than 10°C, the
refrigerator may have a tendency to freeze food at the colder
temperature settings. To reduce the tendency to freeze food:
■Turn the thermostat to a warmer temperature setting.
■Keep the refrigerator full.
■Put foods that are more likely to freeze on the upper
shelf.
The selector switch [2] changes the energy source of the refrig-
erator between propane gas ( ), AC electric ( ), and DC
electric ( ), and shuts down the refrigerator at the OFF
( ) position.
The gas safety valve [3] is built into the control panel. As long
as a flame is present, the valve is open and allows propane
gas to flow into the burner. Any loss of flame (empty propane
gas tank, blow out, etc.) closes the valve and stops the flow of
propane gas.
The igniter [4] makes a spark which ignites the flame in the
burner.
The flame meter [5] shows if a flame is present in the burner.
Controls
Before ignition or start up of the refrigerator:
■Make sure the air flow into the lower intake vent,
through the refrigerator coils and condenser, and out of
the upper exhaust vent is not blocked or decreased.
■Make sure there are no combustible materials in or
around the refrigerator.
Ignition and Start Up
1
2
3
4
5
1
5
Art01901
124 53
Figure 1. Controls
Ignition - propane gas operation
1. Open the valve at the propane gas storage tank.
2. Open the manual shut off valve of the refrigerator.
3. Turn the thermostat [1] to the 5 position (see Figure 1).
4. Turn the selector switch [2] to the gas position ( ).
5. Push and hold in the safety valve [3] and in rapid suc-
cession push in the igniter several times for about five
seconds:
WARNING: Do not hold the safety valve in
for more than 30 seconds. If there is no flame
in this time, wait at least five minutes before
you try again to ignite the unit. If you continue
to hold in the safety valve, gas will collect in the
burner area. This could cause a fire or explo-
sion and result in serious personal injury or
death.
6. When a flame is present, and the flame meter [5] moves
into the green area, release the safety valve.
7. If the flame meter does not move into the green area or
does not remain in the green area, wait five minutes and
repeat steps 5 and 6.
8. Once a flame is present and the flame meter moves into
the green area, turn the thermostat to the desired tem-
perature setting.
Start up - AC electric operation
1. Connect the refrigerator to the AC source. Make sure that
240 volts AC is available.
2. Turn the selector switch to the AC position ( ).
3. Turn the thermostat to the desired temperature setting.
Start up - DC electric operation (3-way models)
1. Connect the refrigerator to the DC source. Make sure that
12 volts DC is available.
2. Turn the selector switch to the DC position ( ).
3. Turn the thermostat to the desired temperature setting.
Shut down
1. Turn the selector switch to the OFF position ( ).
2. Turn the thermostat to the 1 position.
!

6 - Service Manual N301 Model
Battery drain
■In AC operation, there is no battery drain.
■In DC operation, the refrigerator draws 10-13 amps at
14 - 15.4 volts.
■If the battery stops charging during DC operation,
change the refrigerator to gas or AC operation until the
battery starts charging again.
■Check the voltage when in DC operation. The voltage
should never drop below 13.5 volts.
Refrigerator Maintenance
Gas flame appearance
While in LP gas operation, examine the appearance of the gas
flame:
1. Turn the thermostat to the 5 position.
2. Open the lower intake vent.
CAUTION: The burner box cover can be hot.
Wear gloves to avoid burns.
3. Open the burner box door [3] and look at the gas flame [1]
(see Figure 2 and Figure 3).
4. The flame should be a darker blue inside and a lighter
blue outside and should be a constant and steady shape.
5. The flame should not be yellow and should not have an
erratic and unstable shape.
6. Make sure the flame does not touch the inside of the flue
tube [2].
7. Close the burner box door.
!
Diagnosing Cooling Problems
WARNING: The refrigerator cooling system
is under pressure. Do not try to repair or to re-
charge a defective cooling system. The cooling
system contains sodium chromate. Breathing
certain chromium compounds 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
1. Make sure that the intake and exhaust vents are not
blocked.
2. Make sure that the air flow through the back of the refrig-
erator is not decreased or blocked.
3. Make sure the ventilation baffle is correctly installed.
Art01898
2
1
Figure 2. Burner Box
Remove and clean the burner orifice
To remove and clean the burner orifice:
1. Close the valve at the propane gas tank(s).
2. Open the lower intake vent.
3. Close the manual shut off valve of the refrigerator.
4. Turn the gas control to the OFF position ( ).
5. 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.
6. Remove the flare nut from the orifice assembly [1] (see
Figure 4).
7. Remove the orifice assembly from the burner [2]
WARNING: When cleaning, do not try to re-
move the orifice [3] from the orifice adapter [4].
Removal will damage the orifice and can cause
a propane gas leak. Leaking propane gas can
ignite or explode and result in serious personal
injury or death. Do not clean the orifice with a
pin or other objects.
8. Clean the orifice assembly with air pressure and alcohol
only.
9. Using a wrench, fit the orifice assembly to the burner.
10. Place the flare nut onto the orifice assembly.
11. Examine all of the gas connections for leaks.
Art01900
3
Figure 3. Burner Box Location
Figure 4. Orifice Assembly
Art01899
1432
!
!
!

Service Manual N301 Model - 7
Wiring Pictorial
The parts of the wiring pictorial are (see Figure 5):
1............................................................. 240 VAC Power cord
2............................................................................ 3 Amp fuse
3...................................................................... Selector switch
4....................................................................... Thermocouple
5............................................... Thermostat / gas safety valve
6......................................................Thermocouple interrupter
Examine the cooling unit for leaks
WARNING: If you think that the cooling sys-
tem 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 which cooling source is causing the problem
Conduct the following test for each of the following cooling
sources: propane gas, AC electric, and DC electric:
1. Determine if the selected energy source is operating and
heating correctly:
CAUTION: Touch only the outside of the in-
sulation sleeve. During normal operation, some
tubes of the cooling unit are hot. Do not touch
any tubes of the cooling unit.
RED
BLK
4a
4b
2a
2b
3b
3a
1a
1b
BLK
BLU
GRN / YEL
YEL
YEL
BRN (LINE)
BLU (NEUTRAL)
YEL
WHT
BRN
WHT
BLU
RED
BLK
GRN / YEL
12
8
3
4
5
6
7
2
11
1
9
10
Figure 5. Wiring Diagram
2. Within 20 minutes of starting the refrigerator, touch the
outside of the insulation sleeve. The outside of the insula-
tion sleeve should be warm to the touch.
If the insulation sleeve is warm, proceed to step 5.
3. If the outside of the insulation sleeve is not warm, the
selected energy source may not be operating correctly.
4. Start up the refrigerator on a different energy source and
repeat steps 1 and 2. Repeat this process for all energy
sources.
5. If the outside of the insulation sleeve is warm to the touch,
make sure the unit is properly cooling:
■Within one hour after starting up the refrigerator,
touch the fins on the inside of the fresh food compart-
ment. 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.
■If the cooling problem does not occur when operating
on all energy sources, the problem is not the cooling
unit.
6. Use the “Troubleshooting Charts” to determine the cause
of the cooling problem.
!
7.........................................................................Flame meter
8.............................................................................AC heater
9................................-12 VDC Power supply (3-way models)
10.............................+12 VDC Power supply (3-way models)
11...............................................20 Amp fuse (3-way models)
12..................................................DC heater (3-way models)
!

8 - Service Manual N301 Model
Troubleshooting
Is selector
switch in the
AC position?
Is circuit breaker
or fuse blown?
(AC source)
Are any wire
connections
loose?
Turn selector
switch to AC
and start up.
Reset breaker/
replace fuse
and start up.
Repair
connections
and start up.
YES YES
YES
YES
NO NO
NO
NO
NO
YES
Is AC voltage
at output of
3 Amp fuse?
Correct power
source to
3 Amp fuse.
NO
NO
NO
YESYES
YES
YES
Is AC voltage
at input of
selector switch?
Correct power
source to
selector switch.
Is AC voltage
at output of
selector switch?
Replace
selector switch
and start up.
Refrigerator will not operate on AC.
Art01902
Put thermostat
at mid-range or
higher & start up.
Is thermostat
at mid-range or
higher?
Is the power
cord in the
receptacle?
Put the cord in
the receptacle
and start up.
Is AC voltage
at input of
3 Amp fuse?
Replace
3 Amp fuse
and start up.
NO
Correct power
source to heater
and start up.
YES YES YES
NO NO NO
Replace
thermostat and
start up.
Is AC voltage
at input of
thermostat?
Correct power
source to
thermostat.
Is AC voltage
at output of
thermostat?
Is AC voltage at
input of heater?
(black wires)
Replace
AC heater.
YES
Figure 6. AC Troubleshooting Flowchart

Service Manual N301 Model - 9
Is selector
switch in the
DC position?
Is circuit breaker
or fuse blown?
(DC source)
Are any wire
connections
loose?
Turn selector
switch to DC
and start up.
Reset breaker/
replace fuse
and start up.
Repair
connections
and start up.
YES
YES YESNO
NO NO
NO
YES
NO
Is DC voltage
at input of
20 Amp fuse?
Correct power
source to
20 Amp fuse.
NO
Replace 20 Amp
fuse and
start up.
NONO
YESYESYESYES
Is DC voltage
at output of
20 Amp fuse?
Is DC voltage
at input of
selector switch?
Correct power
source to
selector switch.
Is DC voltage
at output of
selector switch?
Replace
selector switch
and start up.
Replace
DC heater.
Is DC voltage at
input of heater?
(yellow wires)
Correct power
source toheater
and start up.
Refrigerator will not operate on DC.
Art01903
Figure 7. DC Troubleshooting Flowchart

10 - Service Manual N301 Model
Is the main gas
supply valve
open?
Is refrigerator
gas valve open?
Open main gas
supply valve.
Open
refrigerator
gas valve.
YES YES
YESNO NO
NO
NO
YES
Is propane gas
pressure
2.6 - 2.7 kPa?
Correct propane
gas pressure.
NO
Replace
thermostat.
NO
Adjust or clean
thermocouple.
NO
YESYESYES
Is tip of
thermocouple in
flame & clean?
Burner ignites but does not maintain flame.
Art01904
Is exhaust vent
unobstructed?
Remove
obstruction from
exhaust vent.
Is thermocouple
and interrupter
connection tight?
Tighten
connection.
Is propane gas
at tap tee 2.6 -
2.7 kPa?
15 - 30 milli-volts
on one terminal,
0 milli-volts
on the other.
0 milli-volts on
both terminals.
10 - 15 milli-volts
on both
terminals.
Replace
safety valve.
16 - 30 milli-volts
on both
terminals.
Check for voltage (milli-volts)
at terminals of interrupter.
Replace
interrupter.
Replace
safety valve.
Replace
thermocouple.
Figure 8. No Flame Troubleshooting Flowchart

Service Manual N301 Model - 11
Replacement Instructions
If the “Troubleshooting Charts” tell you to replace a part, use
the following instructions.
Selector switch
1. Close the valve of the propane gas tank(s).
2. Pull the knob off the selector switch.
3. Remove the two screws that attach the selector switch.
4. Gently pull the selector switch away from the back of the
control panel.
5. Remove each wire, one at a time, from the selector switch.
6. Connect each wire onto the replacement selector switch,
using Figure 5 as a guide.
7. To install the replacement selector switch, reverse steps
1 - 4.
Thermostat
1. Close the valve of the propane gas tank(s).
2. Pull the knob off the thermostat.
3. Remove the gas supply line from the inlet flare fitting of
the thermostat.
4. Remove the safety valve from the thermostat. (Refer to the
“Safety Valve” replacement process on page 12.)
5. Remove the two screws that attach the thermostat to the
bracket.
6. Remove the two red wires from the thermostat.
7. Remove the clips that attach the capillary tube to the cool-
ing fin inside the refrigerator.
NOTE: The capillary tube is located on the fifth cooling fin
from the right.
8. Gently pull the capillary tube through the back of the refrig-
erator cabinet.
9. To install the replacement thermostat, reverse steps 1 - 8.
NOTE: Make sure the capillary tube is flat against the
cooling fin.
10. Examine all the gas connections for leaks.
AC heater
1. Unplug the AC power cord from the receptacle.
2. To make sure the other energy sources do not activate,
turn the selector switch to the OFF ( ) position.
3. Remove the black and green wires that connect the AC
heater.
4. Using a utility knife, vertically cut through the insulation
that surrounds the flue tube.
5. Remove the insulation.
6. Pull the AC heater up and out of the heater well.
7. Push the replacement AC heater down into the heater
well.
NOTE: Make sure the bead of weld on the AC heater
touches the top of the heater well.
8. Put the insulation around the flue tube.
NOTE: Make sure the insulation is completely around the
flue tube.
9. Tape the insulation closed.
10. Attach the one AC heater wire to the thermostat, and at-
tach the other AC heater wire to the power cord.
11. Attach the green and yellow AC heater ground wire to the
side of the thermostat.
12. Plug the AC power cord into the receptacle.
DC heater (3-way models)
1. Remove the DC input leads from the refrigerator.
2. To make sure the other energy sources do not activate,
turn the selector switch to the OFF ( ) position.
3. Remove the two yellow wires that connect to the DC
heater.
4. Using a utility knife, vertically cut through the insulation
that surrounds the flue tube.
5. Remove the insulation.
6. Pull the DC heater up and out of the heater well.
7. Push the replacement DC heater down into the heater
well.
NOTE: Make sure the bead of weld on the DC heater
touches the top of the heater well.
8. Put the insulation around the flue tube.
NOTE: Make sure the insulation is completely around the
flue tube.
9. Tape the insulation closed.
10. Attach the two yellow wires of the DC heater.
11. Make sure that a 20 Amp fuse is in the fuse holder.
12. Attach the DC input leads from the refrigerator.

12 - Service Manual N301 Model
Thermocouple
1. Close the valve at the main propane gas tank(s).
2. Remove the thermocouple from the thermocouple inter-
rupter.
3. Remove the burner box cover.
4. Remove the two screws that attach the thermocouple
bracket to the burner box.
5. Remove the thermocouple from the thermocouple bracket.
6. Remove the wires from the thermocouple interrupter.
7. Using two wrenches, loosen the thermocouple interrupter
from the safety valve.
8. Turn the thermocouple interrupter about half way out of
the safety valve.
9. Turn the replacement thermocouple about half way into
the thermocouple interrupter.
10. Using two wrenches, fully tighten the thermocouple inter-
rupter onto the safety valve.
11. Fully tighten the thermocouple onto the thermocouple
interrupter.
12. Attach the wires to the thermocouple interrupter.
13. Reverse steps 1 - 5 to complete the process.
14. Examine all the gas connections for leaks.
Thermocouple interrupter
1. Close the valve at the main propane gas tank(s).
2. Remove the thermocouple from the thermocouple inter-
rupter.
3. Remove the wires from the thermocouple interrupter.
4. Using two wrenches, remove the thermocouple interrupter
from the safety valve.
5. Turn the replacement thermocouple interrupter about half
way into the safety valve.
6. Turn the thermocouple about half way into the replace-
ment thermocouple interrupter.
7. Using two wrenches, fully tighten the thermocouple inter-
rupter onto the safety valve.
8. Fully tighten the thermocouple onto the thermocouple
interrupter.
9. Attach the wires to the thermocouple interrupter.
10. Open the valve at the main propane gas tank(s).
11. Examine all the gas connections for leaks.
Safety valve
1. Close the valve at the main propane gas tank(s).
2. Remove the thermocouple from the thermocouple inter-
rupter.
3. Remove the wires from the thermocouple interrupter.
4. Using two wrenches, remove the thermocouple interrupter
from the safety valve.
5. Remove the gas outlet fitting from the safety valve.
6. Remove the safety valve from the thermostat.
7. Assemble the replacement safety valve to the thermostat.
NOTE: Put a thread sealer product on the threads of the
gas outlet fitting to make sure the connection does
not leak.
8. Assemble the replacement safety valve to the gas outlet
fitting.
9. Turn the thermocouple interrupter about half way into the
replacement safety valve.
10. Turn the thermocouple about half way into the thermo-
couple interrupter.
11. Using two wrenches, fully tighten the thermocouple inter-
rupter onto the safety valve.
12. Fully tighten the thermocouple onto the thermocouple
interrupter.
13. Attach the wires to the thermocouple interrupter.
14. Examine all the gas connections for leaks.
Refrigerator
1. Close the valve at the main propane gas tank(s).
2. Remove the gas supply line from the bulkhead fitting of
the refrigerator.
3. Unplug the AC power cord from the receptacle.
4. Remove the DC input leads from the refrigerator.
5. Remove the screws that attach the refrigerator to the floor.
6. Remove the screws that attach the refrigerator to the wall.
7. Remove the refrigerator from the opening.
8. To install the refrigerator, reverse steps 1 - 7.
9. Examine all the gas connections for leaks.