Norcold 453, 483 Chassis Bonding Connection, Hypot Test, Testing the Vehicle’s Gas Supply Piping

supply connects to the terminal block at the rear of the refrigerator (See Figure 9 on page 8). The 12 volt DC should enter the refrigerator’s enclosure near the refrigerator’s terminal block. The 12 volt DC connects at (2) one quarter inch quick connects. The positive DC input lead connects to terminal marked (+), and the DC ground input lead connects to terminal marked (-).

CAUTION: Correct polarity must be ob- served when connecting the DC supply. Do not use the chassis of the refrigerator or the vehicle frame as one of the conduc- tors. Connect DC supply wires at the bat- tery and route to the refrigerator.

The distance the current travels from the battery to the refrigerator dictates the wire size. Undersized wire can result in a voltage drop, which will affect the wattage output of the DC heater and result in re- duced refrigerator performance. Norcold recommends the installation of a fuse in the supply wiring between the battery and the refrigerator. For optimum protec- tion, install the fuse as close to the battery as possi- ble.

WARNING: A circuit overload can result in an electrical fire when undersized wires or improperly sized fuses are used. To pre- vent a possible electrical fire, follow R.V.I.A. A119.2 Standards, Norcold’s wire size and fuse specifications, or applicable state and local codes.

TABLE 3

12 VOLT SUPPLY WIRING AND FUSE SIZE

	482, 462		483, 463		453, 443
	452, 442
	min.	max.	min.	max.	Min.	max.
	wire	fuse	wire	fuse	wire	fuse
	size	size	size	size	size	size
0 - 20’	18	6 Amp	10	30	12	20
	AWG		AWG	Amp	AWG	Amp
over	18	6 Amp	8	40	10	30
20’	AWG		AWG	Amp	AWG	Amp

If a wire size is installed which is larger than the minimum size indicated the table above, it must be fused in accordance with the R.V.I.A. A119.2 stand- ard or local governing codes.

Chassis Bonding Connection

A No. 8 AWG copper conductor is commonly used to meet the chassis bonding requirements of the Na-

tional Electric Code (ANSI/NFPA No. 70, Art. 551). When this conductor is used to bond the non-current carrying metal parts of the refrigerator, a No. 10-32 bonding terminal is provided to make the connection. (See Figure 10 ).

Figure 10

Hypot Test

A Dielectric Strength test (hypot) has been con- ducted at the factory; this refrigerator does not re- quire an additional test. If hypot tests are conducted on the vehicle’s 12 volt circuit, the 12 volts must be disconnected from the refrigerator to protect the flame ignition circuit.

Testing the Vehicle’s Gas Supply Piping

When installation of the refrigerator is complete, the propane gas supply piping must be inspected and tested for leaks from the refrigerator to the main gas supply tank. Use a leak detection solution. Do not test for leaks with an open flame.

If compressed air is used for leak testing, the gauge pressure must not exceed 1/2 pound per square inch (14 inches water column).

The appliance and its individual shut-off valve (Fig- ure 11 on page 10) must be disconnected from the gas supply system during any pressure testing of that system at test pressures greater than 1/2 psig (14 inches water column).

The appliance must be isolated from the gas supply system by closing its individual manual shut-off valve (Figure 11 on page 10) during any pressure testing of that system at test pressure equal to or less than 1/2 psig (14 inches water column).

Check the gas pressure to the refrigerator without other gas appliances operating. The pressure should not exceed 11 inches water column. With other appli- ances operating the pressure should not be less than 10.5 inches water column.

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