TM 5-4310-343-35
electrical connections with a suitable potting compound. Use a compound composed of litharge and glycerine to fill cavity
at wire end of heater (31), and at the mounting block.
(f) Test electrical circuit of moisture separator by checking electrical continuity between two pins of
electrical connector (5) with unit at room temperature. An open circuit shall be indicated.
(g) Using a 500 volt dc megger, check resistance between each connector pin and body (34).
Resistance shall be 50 megohms minimum. Apply a potential of 800 volts rms at 60 cps between pins shorted together
and case grounded. Raise gradually in 10 seconds, maintain for one minute and gradually reduce to zero in 20 seconds.
Leakage current shall not exceed 500 microamperes.
(h) Lower temperature of unit to 35 F. Again check electrical continuity between two pins. Resistance
shall be 8 to 12 ohms. Slowly increase temperature of unit. Circuit must be open before unit reaches 84 F.
(i) If heater (31) was removed earlier for replacement, apply litharge and glycerine cement to end of
heater so that vacant space in body is filled with cement when heater is inserted into body (34).
(j) After testing, and moisture separator is acceptable, safety wire the safety plug to plug, and safety wire
two mounting block screws (29) to each other, four connector mounting screws (26) together, and two thermostat
mounting screws (23) for each other.
b. Back Pressure Valve
(1) Overhaul of the back pressure valve is not recommended, therefore, reassembly is not applicable. Perform
the following tests described in paragraph 5-12(b) (2). If valve does not operate correctly replace with new valve.
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