TM 11-5895-846-14
and shorts to ground with the power removed from the
(4) Replace the switch by performing steps
(1), (2) and (3) above in reverse order.
w. Verify that the temperature in the CSS racks 5
b. Circuit Breakers CB, CB2, CB8, CB13, CB16
through 8 is within the required range of +320 F to +
and CB19.
1200 F.
x. Verify that the thermostats S2 through S9 are
(1) Using a nut driver, remove all the wires
not closed if the temperature is within the range.
from the circuit breaker terminals. Tag each wire after it
Replace any thermostat that is closed.
is removed. Retain the hardware.
y. If the shelter wiring and thermostats are
(2) On the front panel remove screws with
satisfactory, check the wiring and relays (K1 through K4)
washers (note the position of the flat washer and
lockwashers) which secure the circuit breaker to the front
z. Replace defective wiring or relay as instructed in
panel. Note the orientation of the circuit breaker and
then remove it from the PDP. Retain the hardware.
aa. Replace appropriate circuit breaker if the
(3) Replace the circuit breaker by performing
steps (1) and (2) above in reverse order.
preceding items are satisfactory. Replace the PDP in
the shelter and check for proper operation.
c. Circuit Breaker CB3 through CB7, CB9 through
ab. If the MONITOR meter functions improperly,
CB12, CB14, CB15, CB17, CB18 and S3.
check the PDP wiring of switch S1 and meter M1.
(1) Use a soldering iron and remove and tag
Replace the defective item.
all the wires from the terminals. Take extra caution with
the auxiliary switch contacts on CB3 through CB6, CB9
7-6.
Removal and Replacement
of
Power
and CB12.
(2) On the front panel remove the nut and
washer which secure the unit to the front panel. Note the
WARNING
orientation and remove.
Turn off main power to the shelter at
(3) Replace the unit by performing steps (1)
the trailer power distribution output
and (2) above in reverse order.
switch.
Remove the main power
cables from the power entry panel.
d. Connectors J1 through J11.
(1) Remove the jam nut that secures the
a. On the unit front panel, place all circuit breakers
connector to the chassis.
to the OFF position.
(2) Slip the sleeving back on the wires (do not
b. On the bottom of the unit, remove two shelter
replace unless defective).
cable plugs P1 and P2 from unit connectors J1 and J2,
(3) Unsolder one lead at a time. Resolder to
respectively, and the ground wire from terminal El.
the same terminals on the replacement connector.
c. On the top of the unit, remove nine shelter cable
(4) Remove the old connector and mount the
plugs P3 through P11 from unit connectors J3 through J
new connector using the jam nut.
11, respectively.
(5) Slide the sleeving forward.
d. At the sides of the unit front panel, loosen 16
captive screws and rest the unit on the shelf located
e. Voltrip Modules A1 and A2.
below the unit and remove.
(1) Remove the four nuts and washers which
e. Replace the unit by performing steps a through d
secure the voltrip support bracket to the front of the PDP.
above in reverse order.
(2) Using a soldering iron, remove and tag the
wires from the voltrip unit.
7-7 Removal, and Replacement of Power Distribution
(3) Remove the nut and washer securing the
Panel Components.
voltrip to the bracket. Note the orientation of the voltrip.
(4) Replace the voltrip unit by performing
Remove the PDP first (para 7-6 above), replace the
steps (1), (2), and (3) above in reverse order.
appropriate component (see below), and then reinstall
the PDP.
f. Resistor Boards El and E2.
a. Switch S1 or S2.
(1) Remove the four nuts and washers which
(1) On the front panel remove the knob from
secure the board to the front of the PDP.
the shaft.
(2) Using a soldering iron, remove and tag the
(2) Tag and remove the wires from the switch
wires from the board.
terminal.
(3) Replace the board by performing steps (1)
(3) On the front panel, remove the hardware
and (2) above in reverse order.
which secures the switch to the front panel.
7-4