ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
0064 00
TACTICAL WATER PURIFICATION SYSTEM (TWPS)
UNIT MAINTENANCE PROCEDURES
COLD WEATHER SYSTEM
Replace / reinstall the motor starting relay as follows (see Figure 5):
1.
Unplug the heater power cord from the power source and then from the heater.
2.
Remove the jumper from the relay terminals three (3) and two (2).
3.
Tag and disconnect the wires from relay terminals one (1) and two (2).
4.
Discard the old relay.
5.
Connect the two, tagged, white wires to relay terminal one (1).
6.
Connect the tagged red and black wires to relay terminal two (2).
7.
Connect the black motor wire to relay terminal three (3).
NOTE
The relay is position sensitive. Make sure the relay is mounted to the heater shell
with the terminals on the bottom (facing down).
8. Orient the relay so it is in the same position it was in before it was removed and secure the relay
to its mounting bracket with the two screws removed earlier.
9. Install new wires ties on the wires.
10. Secure the screen to the inlet duct adapter using the three screws removed earlier.
Replace the diesel heater motor and pump assembly as follows (see Figure 6):
WARNING
Mechanical and electrical hazard. Before starting the procedures to replace the
motor and pump assembly, be sure the heater switch is OFF and the power cord is
unplugged from the power source and the heater. Failure to observe this warning
may result in injury if the fan operates or injury or death from electrical shock.
1. Remove the diesel heater motor and pump assembly as follows:
a. Make sure the heater power switch is OFF.
b. Make sure the heater power cord is unplugged from the power source and from the
heater.
c. Remove the fan blades. Refer to REPLACE and Diesel Heater Fan Replacement.
d. Remove the ignition transformer but do not disconnect or cut any of the wires. Refer to
e. Disconnect the white, red, and black motor wires from relay terminals one (1), two (2),
and three (3). (See Figure 5.)
f. Disconnect the green wire from the motor mounting bracket.
g. Unplug the air line from the bottom of the pump.
h. Remove the two lock nuts that secure the motor to the motor bracket.
i. Lift the motor and pump assembly off the motor mounting bracket and out of the inlet end
of the heater.
j. Discard the motor and pump assembly.
0064 00-9
