TM 9-4120-399-14
b. Test.
(1) Using a multimeter check that circuits are closed across terminals 4 and 5, 5 and 6,
and 4 and 6.
(2) Discontinuity across any terminals indicates a defective thermostat and it must be
replaced.
c.
Installation.
(1) Position thermostat (4) onto unit.
(2) Connect thermostat wires to terminal block TB3.
(3) Install clamp (7) and screw (6).
(4) Install thermostat (4), two lock nuts (3), two flat washers (2), and two screws (1)
onto bracket (5).
(5) Install heater diffuser (See para. 4-25).
(6) Install top panel (See para. 4-20).
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