Thetford N400 Series Installation Manual - Manual (Page 8)

Installation Manual 8
Connect the Propane Gas Components
This refrigerator operates on propane gas at a pressure of 11
inches Water Column Propane.
Connect the propane gas supply system:
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 examine for leaks.
- Do not connect the refrigerator to the propane gas tank
without a pressure regulator between them.
- To avoid a propane gas leak, always use two wrenches
to tighten or loosen the gas supply line connections.
- Leaking propane gas can ignite or explode and result
in dangerous personal injury or death.
Connect the gas supply line to the refrigerator:
- Make sure all tubing and fittings obey all local, state, and
national codes about size and type.
- Make sure that all flexible metal connectors obey the current
CAN1-6.10 Standard.
- The voltage drop will reduce the cooling performance of the
refrigerator.
The terminals for connecting the DC power supply are marked
positive (+) and negative (-) on the terminal block of the refrig-
erator. Make sure that:
- Each DC power supply wire is attached to the correct
polarity terminal.
- The chassis or the vehicle frame is not used as one of the
conductors.
- The DC power supply wires including the fuses are routed
directly from the battery to the refrigerator.
2. Connect the D.C. power supply wires:
- Attach a 1/4 inch female Quick Connect terminal to each DC
power supply wire.
- Push each power wire onto the terminal block [1] at the rear
of the refrigerator (See Art00975).
- Make sure each DC power supply wire is on the correct
polarity terminal.
Connect the 12 volts DC supply (model N510.3):
As the distance from the vehicle battery to the refrigerator
increases, the correct AWG wire size and fuse size also
increases. If the wire size is too small for the distance, a
voltage drop occurs. The voltage drop decreases the output of
the system heater and causes poor cooling performance.
1. Determine the min. wire size and the max. fuse size to use:
WARNING: If you use an incorrect wire size and/or fuse
size, electrical fire can result.
- On 2-way models, use a minimum of 18 AWG wire and a
maximum 6 Amp fuse.
- On 3-way models, measure the distance from the vehicle
battery to the refrigerator.
- If the distance is 0 - 20 feet, use a minimum of 10 AWG
wire and a maximum 30 Amp fuse.
- If the distance is over 20 feet, use a minimum of 8 AWG
wire and a maximum 40 Amp fuse.
- If the wire size is larger than the min. size, use the correct
fuse per RVIA A119.2 standard or local codes.
The wire connections must be clean, tight and free of corrosion.
If any of these items are not correct:
- A voltage drop to the refrigerator will occur.
- The voltage drop will reduce the cooling performance of the
refrigerator.
2. Install a fuse in DC power supply wires between the battery
and the refrigerator:
- Put fuse as close to the battery as possible.
3. Connect the DC power supply wires:
- Attach a 1/4 inch female Quick Connect terminal to each DC
power supply wire.
NOTE: Do not use the chassis of the refrigerator or the
vehicle frame as one of the conductors. Attach the DC
power supply wires only to the battery and the power board
[1] of the refrigerator.
- Push the positive DC power wire onto the power board
terminal that is marked 12VDC.
- Push the DC ground wire onto the power board terminal
that is marked 12V GND1.
- Make sure each DC power supply wire is on the correct
polarity terminal.