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
1. Make sure the heater power switch is OFF and the power cord is unplugged from the power
source and the heater.
2. Remove the 4 screws that secure the electric control box to its bracket.
3. Pull the electric control box away from the electrical panel but do not disconnect any electrical
connections.
WARNING
Electrical hazard. After restoring power to the heater to conduct the test, be
extremely careful not to let any part of your person touch the spark plug, bare
wires, leads, or terminals. Failure to observe this warning may result in serious
injury or death from electrical shock.
a.
Plug the heater power cord in first at the heater and then at the power source.
b.
Switch the heater ON.
c.
Touch one test lead of a voltmeter to any one of the white leads on the distribution bar.
d.
Touch the second voltmeter test lead first to the orange wire on the left side of the
distribution bar. You should get a reading of 110 volts from a good safety control.
e. Then touch the second voltmeter test lead to the blue wire on the left side of the
distribution bar. You should get a reading of 110 volts from a good safety control.
f. If one or both wires do not read 110 volts (approximately) replace the safety control
assembly.
g. Turn the heater OFF.
h. Unplug the heater power cord first from the power source and then from the heater.
i. If the safety control assembly does not need to be replaced, reattach the electric control
box to its bracket using the 4 mounting screws.
DISTRIBUTION BAR
ORANGE WIRE
BLUE WIRE
WHITE WIRE
SAFETY CONTROL ASSEMBLY
ELECTRIC CONTROL BOX
Figure 10. Diesel Heater Safety Control Test Set-Up.
0064 00-15
