Check the operation of the safety control

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

e. Secure the safety control assembly to the bracket using the four screws removed earlier.

f. Secure the control box assembly to the bracket using the four screws and washers

removed earlier.

NOTE

After the safety control is replaced, the operation of the safety control should be

checked before starting the heater by testing for conductance at the ignition

transformer.

5. Check the operation of the safety control as follows (see Figure 13):

WARNING

Electrical hazard. A transformer in good condition produces very high voltage at

the output terminals. Before accessing the transformer, 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 serious injury from electrical

shock.

a. Make sure the heater power switch is OFF and the power cord is unplugged from the

power source and the heater.

b. Remove the screen from the inlet end of heater.

c. Tag and disconnect the red and white transformer wires from the red and white ignition

wires.

WARNING

Electrical hazard. After restoring power to the heater to check the operation of the

safety control, 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.

d. Plug the heater power cord in first at the heater and then at the power source.

e. Switch the heater ON.

f. DO NOT TOUCH any bare wires, leads, or terminals with any part of your person.

Touch ohmmeter test probes to the red and white transformer wires.

g. If the new safety control is working properly, the ohmmeter should indicate an open line

h. If the ohmmeter does not indicate an open line, retest the safety control.

i. Turn the heater OFF.

j. Unplug the heater power cord first from the power source and then from the heater.

k. Reconnect the red and white ignition and transformer wires.

l. Reinstall the screen to the inlet end of heater.

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