Installation Manual 7
Connect the Electrical Components
Electrical current necessary
:
DC Operation
T1274
models - 12 volts DC voltage (10.4 volts min. - 15.4 volts max.)
Make no changes to any of the electrical wiring supplied with the refrigerator. Any changes that you would make to the electrical wiring
will void the warranty.
Connect the 12
V
DC supply:
To reduce the risk of electrical interference from other DC appliances and induction from voltage spikes:
- The refrigerator must have an independent filtered 12V DC supply.
-
Route the DC power supply wires including the fuses directly from the power source to the refrigerator using either Option A or Option
B shown below.
Option A
Use a battery in parallel, in-between the refrigerator and the battery
charger or an electrically filtered power converter. A fuse or circuit
breaker should be wired as close to the power supply as possible.
Option B
Wire the refrigerator directly to the electrically filtered DC power
converter. The power converter must have a maximum DC ripple
voltage less than or equal to 250mV. A fuse or circuit breaker
should be wired as close to the power supply as possible.
- To connect the DC power supply wires, it is recommended to install 1/4” insulated female spade terminals or Stocko connector
W2041.100G to the connecting wire. (See Art 02740)
-
Alternatively, the connector may be cut off and the connection can be wired via closed-end
connectors (bell cap) or crimp connectors. If the factory connector is cut off, proper care
should be taken by the OEM to assure that the connection is made properly.
Thetford
is
not
responsible for damage caused by improper capped or crimped connections.
(RED)
+
- As the distance from the power source to the refrigerator increases, the correct AWG wire
size also increases. Using longer than recommended wire lengths increases voltage drop and
increases the risk that the refrigerator may not turn back on after a drop in DC voltage. The
voltage required to start the compressor on the
T1274
is 11.7 volts. The compressor will stop
ART 02740
working when the voltage falls below 10.5 volts. The OEM should assure that the draw for all DC
powered equipment does not drop below 11.7 volts when the refrigerator is attempting to power on. If the refrigerator is operated on
battery power only, battery life can be extended by replenishing power through the use of solar panels or power from the tow vehicle
utilizing a wired 7-way plug.
Refrigerator
2
5A Fuse
12VDC
Refrigerator
2
5A Fuse
(WHITE
)
