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RECTIFIER (CR-1) AND CAPACITORS (C-1 and C-2)
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TM-5-4120-369-14 Air Conditioner Horizontal Compact 18 000 BTU 208 Volt 3 Phase 50-60 Hertz NSN
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EVAPORATOR FAN AND MOTOR ASSEMBLY (B-3) - Continued
TM 5-4120-369-14
4-31.
RECTIFIER (CR-1) AND CAPACITORS (C-1 and C-2) - Continued.
(2) Using the ohms function of a multimeter, measure the resistance between the
+ and the - terminals of the rectifier:
(a) With the + lead of the meter on the - terminal of the rectifier and the
- lead of the meter on the + terminal 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 measurements differ from those given in (a) and (b).
(3) Using multimeter, test capacitor for continuity. Replace capacitor if continuity
exists.
d.
Installation.
(1) Refer to figure 4-21 and install rectifier.
(2) Refer to FO-1 and install capacitors by crimping leads into cable terminals.
(3) Refer to FO-1 and attach cable to rectifier.
(4) Refer to paragraph 4-27 and install the junction box.
EVAPORATOR FAN AND MOTOR ASSEMBLY. (B-3)
a.
General.  The evaporator fan motor is a multispeed motor. The motor operates at 3450
RPM in high speed and 1725 RPM in low speed operation and each winding is thermally protected,
Motor speed is manually controlled by the evaporator fan speed switch.
Controls.  Before removing the evaporator fan and motor assembly, test the mode
b.
selector s witch, evaporator fan speed switch, and control circuit breaker (paragraph 4-30) and
evaporator fan motor low/high speed switch (paragraph 4-30) which control operation of the motor.
If electrical control components or wiring that supply power to the motor are not defective and the
motor does not operate, proceed as follows:
Test.
c.
Test the motor for open-circuit or grounded windings as follows.
(1) Using a multimeter, test at P3 for continuity across a combination of two leads
until each of the three high speed winding leads is tested.  Do the same for the three low speed
winding leads.  if continuity is not indicated, the winding is open and the motor should be
replaced.
(2) Using a multimeter, test for continuity by placing one test probe against the motor
housing (on bare metal only) and the other probe against each of the motor winding leads. If
continuity is indicated, the winding is grounded, and the motor should be replaced.

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