ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
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TACTICAL WATER PURIFICATION SYSTEM (TWPS)
UNIT MAINTENANCE PROCEDURES
COLD WEATHER SYSTEM
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.
e. Plug the heater power cord in first at the heater and then at the power source.
f. Switch the heater ON.
g. If the heater runs properly, install a new overheat switch.
2. Install a new overheat switch, or reinstall the existing overheat switch as follows:
a. Turn the heater power switch OFF and unplug the power cord first from the power source
and then from the heater.
b. Plug the two white wires onto the overheat switch terminals. (It does not matter which
lead is connected to which terminal.)
c. Secure the overheat switch to its bracket on the duct outlet adapter using the two screws.
Diesel Heater Photocell Testing/Replacement:
Part:
Diesel heater photocell (TM 10-610-309-24P)
Tool:
Multi-meter, ohmmeter, or equivalent test instrument
Equipment condition:
Diesel heater OFF and power cord disconnected from source and from heater
Test and, if necessary, replace the diesel heater photocell as follows:
WARNING
Electrical hazard. Before opening up the top cover of the diesel heater to access
the photocell, be sure the heater power 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 or death from electrical shock.
1. Test the diesel heater photocell as follows (see Figure 9):
a. Make sure the heater power switch is OFF and the power cord is unplugged from the
power source and the heater.
b. Open the top cover of the heater by unsnapping the three "screws" at the front of the
cover and lifting the cover.
c. Open the access panel at the top of the heater.
d. Gently pull the photocell out of the bracket that is attached to burner head.
e. Tag and disconnect the blue and white photocell leads.
f. Connect the ohmmeter test leads to the photocell leads.
g. Hold the open end of photocell towards a light source (a 60 watt light bulb or direct
sunlight). The resistance indicated on the ohmmeter should be low.
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