Dometic RM 2552 Installation And Operating Instructions Manual page 8

ELECTRICAL CONNECTION
120 Volts AC Connection
The refrigerator is equipped with a three-prong (ground-
ing) plug for your protection against shock hazards and
should be plugged directly into a properly grounded
three-prong receptacle. DO NOT cut or remove the
grounding prong from this plug. The free length of the
cord is 2 feet and therefore recommended that the
receptacle be located to the left side of the refrigerator
(viewed from the rear) and approximately 6 inches from
the floor (see FIG. 11). This allows easy access through
the vent door. The cord should be routed to avoid direct
contact with the burner cover, flue cover or any other
components that could damage the cord insulation.
120 Volt AC
receptacle
6"
FIG. 11
12 Volts DC Connection
2-way refrigerator model
On the 2-way refrigerator model RM 2552, 12 volts DC
must be connected to the refrigerator to provide power
for operation of the automatic reigniter. One terminal
block marked "12 volts DC reigniter", is located on the
back of the refrigerator cabinet. (See FIG. 1).
The automatic reigniter must be connected to a separate
battery circuit and will draw about 0.1 amp when spark-
ing.
3-way refrigerator model
On the 3-way refrigerator model RM 2553, there are two
terminal blocks for 12 volt DC. The terminal blocks are
marked "12 volts DC reigniter" and "12 volts DC heater",
and are located on the back of the refrigerator cabinet.
(See FIG. 1).
The refrigerator must be connected to the battery circuit
with two wires of adequate capacity to avoid voltage
drop. The wire gauge should be chosen with consider-
ation to the wire length in accordance with the table
below.
The 12 volt DC circuit must be fused. Maximum fuse size
is 20 amps for RM 2553.
8
Correct polarity must be observed when connecting to
the DC supply.
DO NOT use the chassis or vehicle frame as one of the
conductors. Connect two wires at the refrigerator and
route to the DC supply.
The refrigerator will draw 15 amps at 12 volts DC.
Maximum total conductor wire length in feet and meters.
RM 2552,
2-way
min. wire
size
17 ft.
14 AWG
5 m
27 ft.
12 AWG
8 m
The connections must be clean, tight and free from
corrosion. If not, a resulting voltage drop will cause a
decreased cooling capacity.
CAUTION
Do NOT operate the refrigerator on 12 volt DC when the
vehicle is parked. The amperage draw of the 12 volt DC
heating element can discharge a battery in a very short
time. The installation of a 12 volt DC operated refrigera-
tor requires a relay to be installed on the tow vehicle or
in the caravan. The relay will automatically shut off the
12 volt DC power to the refrigerator when the ignition is
turned off. (See FIG. below).
Breaker Ignition
point coil
-
Battery
RM 2553
3-way
min. wire
size
10 AWG
8 AWG
Switch key
Relay
Refrigerator
Reigniter
+ - +
Battery