TM 5-4520-253-13
Do not connect power cable to 120 V ac, 50/60 Hz electri-
cal source until power cable has been properly connected
to power plug.
d. Install power plug (4-pin) on 3-wire, 12-gauge cable.
Refer to REMOVE/lNSTALL POWER,
FUEL PUMP, AND ROOM THERMOSTAT PLUGS, page 3-124.
e. At other end of cable, connect black wire to L1 and white wire to L2 of power source. Connect
green wire to power source ground.
f. Install external fuel pump. Secure with 1/4-inch mounting bolts (washers and nuts, if needed)
or lag screws. If fuel pump is mounted on wood or other nonconducting material, be sure to
ground pump body.
g. Connect fuel supply line (1) between FUEL
INLET fitting (2) and external fuel pump
(3). Connect fuel line (4) between fuel con-
tainer (5) and external fuel pump. Connect
line (6) for receiving fuel overflow to FUEL
OVERFLOW fitting (7) and overflow con-
tainer (8). Tighten all connections securely.
Following step connects 24 V dc circuit. Be sure correct
polarity is maintained.
h. Install fuel pump plug (2-pin) on 2-wire, 16-gauge cable.
Refer to REMOVE/lNSTALL POWER,
FUEL PUMP, AND ROOM THERMOSTAT PLUGS, page 3-124. Connect other end of cable to
electrical plug for mating with fuel pump connector and connect to fuel pump. Connect fuel
pump plug to EXTERNAL FUEL PUMP RECEPTACLE on front of heater.
3-8
