TM 10-5410-221-24
Remove electrical leads from terminals 1 through 3 of
(2) Remove adhesive from around electrical
terminal board TB3, from terminals 1 through 3 on TB4
leads and unsolder wires from S4 thermo switch (2) and
and from terminals 'through 10 on TB5 using figures 6-13
remove switch.
and 6-22 as a guide.
(3) Disassemble strip heater assemblies to
(4) Remove nuts, washers and screw securing
replace defective parts as follows.
connectors to water box assembly at remove harness
(a)
Remove nipple (1, fig.
6-15) from
from shelter (fig. 6-1).
terminals.
c. Disassembly. Disassemble wiring harness as
(b) Remove nut (2), screw (3) and washer
required for replacement of damaged par by removing
terminals (1, 2, fig. 6-13) from electrical leads.
(4) used to secure terminal leads and heater assembly.
d. Assembly. Assemble wiring harness reverse
(c) Remove gasket (5), heater (6),
order of disassembly using figure 6-13 as a guide and by
reflector (7) and insulator (8) from the shelter.
installing terminals (1, 2 and crimping to secure.
d. Assembly. Assemble wiring harness in reverse
e Test. Use a continuity light, multimeter or other
order of disassembly using figures 614 and 6-1 as a
continuity checking device to check continuity of wiring
guide and observing the following.
individual wires. Continuity must not exist between
(1)
Install terminals (1, fig. 6-14) and crimp to
connector pins or between connector pins and col nector
secure.
shell. If test indicates a defective col nector or wires,
replace harness.
(2) Solder wires to terminals on switch (2),
according to Specification MIL-S-6872 using Sn60 solder
f. Installation. Install wiring harness assembly in
that conforms to Specification QQ-S-571.
reverse order of removal using figure 6-13 as a guide for
terminal identification and figure 1-7 for wiring schematic.
(3) Assemble strip heaters in reverse order of
step c(3) above and observing figure 6-15.
e Test. Use a' continuity light, multimeter of other
continuity checking device to check continuity of wiring
a. General. The water heater harness assembly
(5, fig. 6-1) consists of electrical connection and 17
individual wires. Continuity must not exist between
electrical leads to provide interconnection between the
connector pins or between connector pins and connector
water system power harness and the water box heaters
shell. If test indicates a defective connector or wires
replace harness assembly.
b. Removal.
f. Repair.
If possible, straighten any bent
(1) Disconnect connector P33 from J3 in the
connector pins. Inspect wires for abrasions and cuts of
water box assembly.
insulation. Minor cuts and abrasions are acceptable and
may be repaired by wrapping with vinyl tape. Replace
(2) Remove the screws and washers use to
harness assembly if individual wires are cut or otherwise
secure thermo switch S4 (19, fig. 6-1) to the water box.
damaged.
Note. Cuts or abrasions of harness assemblies
(3) Remove wiring harness electric; leads from
may be due to sharp edges of electrical raceways,
the HTR-1, HTR-2 and HTR(20, fig. 6-1) strip heaters
interference with other components or improper
using figure 6-1 as a guide for terminal identification and
handling. The cause shall be determined and eliminated
re move the harness.
before installation of the harness assemblies.
c Disassembly. Disassemble wiring harness as
g. Installation. Install wiring harness assembly in
required for replacement of damaged part as follows.
reverse order of removal procedure using figure 6-14 as
(1) Remove terminal (1, fig. 6-14).
a guide for terminal identification and figure 1-7 for wiring
schematic. Use figure 6-15 as a guide for heater
installation.
6-13
