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TM 5-4120-361-14
c.
Inspection and Test.
—
(1) Inspect rectifier and both ca-
pacitors for cracked or broken case and
signs of overheating.
Replace if
scorched or blistered, or if case is
damaged.
(2) Using the ohms function of a
multimeter, measure the resistance be-
tween the + and - terminals of the rec-
tifier:
(a) With the + lead of the meter
on the - terminal of the rectifier and
the - lead of the meter on the + termi-
nal of the rectifier, conductivity
should be indicated.
(b) Reverse the meter leads to
the rectifier; meter should indicate an
open circuit (infinity).
(c) Replace rectifier if measure-
ments differ from those given in (a) and
(b).
(3) Using multimeter, test capaci-
tor for continuity.
Replace capacitor
if continuity exists.
d.
Installation.
—
(1) Refer to figure 4-17 and in-
stall rectifier.
(2) Refer to figure 1-5 and in-
stall capacitors by crimping leads into
cable terminals.
(3) Refer to figure 1-5 and attach
cable to rectifier.
(4) Refer to figure 4-10 and in-
stall the junction box.
4-30.
Heating Elements and Heater Cut-
out Switch.
a.
General.
A bank of six elements
provides heat for the heating mode;
three elements are energized in the LOW
and all six in the HIGH heat position.
Temperature is controlled by thermo-
static cycling.
Dangerously high temp-
eratures are prevented by the heater
cutout switch.
b.
Removal.
—
(1) Refer to figure 4-4 and remove
top front cover.
(2)
move the
box .
Refer to figure 4-10 and re-
control module and junction
(3)
move the
Refer to fiqure 4-18 and re-
heating elements or the heater
cutout switch.
c. Testing.
Refer to wiring diagram
(figure 1-5) and test across the heatinq
element leads for continuity, using a
multimeter.
If no continuity exists,
replace the heating element.
Using a
multimeter, test the heater cutout
switch for continuity between terminals
1 and 2 (also between terminals 3 and
4).
If no continuity exists, replace
the heater cutout switch.
d.
Installation.
—
(1) Refer to figure 4-18 and in-
stall the heating element or heater cut-
out switch.
(2) Refer to figure 4-10 and in-
stall the junction box and control mod-
ule.
(3) Refer to figure 4-4 and in-
stall the top front cover.
4-31.
Thermostatic Switch.
a.
General.
The thermostatic switch
automatically changes the condenser fan
speed by sensing ambient temperature.
With the ambient temperature at 95°F
(35°C) or below, the condenser fan will
run at low speed.
If the ambient tem-
perature rises to approximately 105°F
(40.6°C), the condenser fan will run at
high speed.
Conversely, if the fan is
running at high speed and the ambient
drops to approximately 95°F (35°C), the
fan will run at low speed.
b.
Testing.
If no speed change is
noted (change in noise level) during
operation, when the ambient temperatures
change as described in paragraph a.
above, the switch is defective and must
be replaced.
c.
Removal.
—
(1) Refer to figure 4-4 and remove
top front cover.
(2) Refer to figure 4-19 and re-
move thermostatic switch.
4-28
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