- 18 -
INSTALLATION PROCEDURE
Example: If the distance between the refrigerator and the
12 VDC supply is 20 ft., the total wire length is 40 ft. and
a wire size of 10 AWG should be used.
12 VDC CONNECTION
RM2451, RM2551, DM2652, DM2852, RM3762, RM3962,
RM1350 & NDA1402: These refrigerator models are not de-
signed for 12V DC operation of the cooling system. However,
12V DC must be supplied to operate the controls.
RM2354, RM2454, RM2554, DM2662, DM2663, DM2862 &
NDM1062: These refrigerator models require a continuous 12
VDC supply to maintain the automatic energy system.
The connection is made to the positive (+) and negative (-)
terminals of the terminal block on back of the refrigerator.
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. Ensure the connections are clean, tight and free
from corrosion.
For 3-way models, the voltage drop affects the wattage output
of the 12 V cartridge heater and the refrigerator performance.
The 12 VDC heater is fused with a 30 amp. in-line blade fuse.
Ensure that the wires from the battery to the refrigerator are
able to handle the load. Recommended wire sizes are dis-
played in the table below.
MAXIMUM WIRE LENGTH
WIRE
MODEL
Size Length
AWG
ft
RM2351, RM2451
RM2551, DM2652
DM2662, DM2852
DM2862, RM3762
RM3962, NDM1062
RM1350, NDA1402
14
12
17
27
RM2354, RM2454
RM2554, DM2663
10
8
17
27
ALTERNATOR (D+) CONNECTION
RM3762, RM3962 & RM1350 (with the automatic door
locking system)
The refrigerator requires the connection of a signal wire from
the alternator (D+) in order to maintain the automatic door
travel latch for RM1350 and the temporary gas lockout func-
tion. The gas operation will automatically be locked out for
a period of 15 minutes when the engine is switched off. This
will prevent gas operation e.g. when stopping at a refueling
station.
Connect the vehicles alternator (D+) to the D+ on
the terminal block.
Battery
B+
Alternator signal wire to the refrigerator
D+
ALTERNATOR
Ignition switch
Charge light
D+ (Alternator signal wire)
Valid for refrigerator models
with the automatic door lock-
ing system.
FIG 18 - ALTERNATOR CONNECTION
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