TM 5-4520-253-13
R E M O V E / l N S T A L L P O W E R , F U E L P U M P , A N D R O O M T H E R M O S T AT
PLUGS (CONT)
Table 3-7. Plug Wire Connections
Plug
I
Cable
I
Connections
Power (4-pin )
3-wire, 12-gauge
Black wire to pin A.
White wire to pin C.
Green wire (ground) to pin D.
Room Thermostat
I
3-wire, 16-gauge,
I
Black and white wires to pins A and C.
(3-pin)
shielded
Green wire (ground) and shield to pin B.
Fuel Pump (2-pin)
2-wire, 16-gauge
I
Hot wire to pin A.
Green wire (ground) to pin B.
Section VIl. PREPARATION FOR STORAGE OR SHIPMENT
3 - 2 0 . D I S A S S E M B L Y O F H E A T I N G S Y S T E M .
a. If heater is in operation, move HEATER-OFF-FAN switch to OFF. Allow heater to complete
normal purge and cooling-off cycle.
b. Disconnect exhaust line.
c. Close fuel supply valve.
d. Shut off 120 V ac power at power source and disconnect the 3-wire, 12-gauge cable at heater
power plug. Disconnect power plug from heater and remove plug and bushing from 3-wire
cable. install dust cap on receptacle,
e. Disconnect 3-wire, 16-gauge cable and shield from room thermostat. Remove room thermostat
from wall or other mounting surface.
f. Disconnect room thermostat plug from ROOM THERMO receptacle. Remove plug from 3-wire
cable. Install dust cap on ROOM THERMO receptacle.
g. Disconnect external fuel supply cable plugs from EXTERNAL FUEL PUMP RECEPTACLE and
fuel pump. Remove plugs from 2-wire, 16-gauge cable, Set aside fuel pump plug (2-pin),
Install dust cap on EXTERNAL FUEL PUMP RECEPTACLE.
3-126
