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TM 10-4210-235-13
4-23. AFFF TANK HEATER ASSEMBLY REPLACEMENT AND REPAIR. - continued
(8)
Carefully install insulation blanket (19) and wrapper (18) Feed blanket heater (15) leads through hole in
insulation blanket and wrapper
NOTE
Heaters can be wired for either 120 or 240 vac operation.
(9)
Carefully install insulation blanket (17) and wrapper (16).
(10)
Coat the tank (29) contacting surface of temperature control thermostat (25) and temperature cutout
thermostat (26) with heat sink compound. Install two screws (9), new lock washers (10), and nuts (11)
(11)
Seal the insulation exposed around the fill collar (20) with adhesive sealant to prevent water from settling
around fill collar and being absorbed into insulation blanket (17)
(12)
Connect wire leads inside enclosure (22), for voltage being used, per tags and wiring diagram figure 4-23
and schematic figure 4-24.
(13)
Install rubber pad (14), cover (13), and two screws (12).
(14)
Install fill cap (8)
(15)
Install heating cables (6). Secure to pipe with electrical tape
(16)
Connect heating cable (6) leads to wire leads (7) per tags and wiring diagram figure 4-23.
(17)
Install insulation (5) and insulation protectors (4)
(18)
Install rod (3) and new pin (2). Be sure rod is in closed position.
(19)
Install fill cap (8) and hand tighten only
4-56
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