System Control Switch; Run Capacitor; Thermostat - Friedrich HazardGard SH14J30B-A Service & Parts Manual

SYSTEM CONTROL SWITCH (Figure 6)
This switch is double pole, single throw. Check for
continuity between terminals 2 and 3, and 5 and 6.
FIGURE 6 SWITCH, ON-OFF
CAPACITOR, RUN
A run capacitor is wired across the auxiliary and
main winding of a single phase permanent split
capacitor motor such as the compressor and fan
motors. A single capacitor can be used for each
motor or a dual rated capacitor can be used for
both.
The capacitor's primary function is to reduce the
line current while greatly improving the torque
characteristics of a motor. The capacitor also
reduces the line current to the motor by improving
the power factor of the load. The line side of the
capacitor is marked with a red dot and is wired to
the line side of the circuit (see Figure 7.)
FIGURE 7 RUN CAPACITOR HOOK–UP
FAN
MOTOR
6
COMPRESSOR
RED DOT

RUN CAPACITOR

CAPACITOR – TEST
1. Remove the capacitor from the unit.
2. Check for visual damage such as bulges,
cracks, or leaks.
3. For dual rated capacitors, apply an ohmmeter
lead to the common (C) terminal and the other
probe to the compressor (HERM) terminal. A
satisfactory capacitor will cause a deflection
on the pointer, then gradually move back to
infinity.
4. Reverse the leads of the probe and
momentarily touch the capacitor terminals. The
deflection of the pointer should be two times
that of the first check if the capacitor is good.
5. Repeat steps 3 and 4 to check the fan motor
capacitor.
NOTE: A shorted capacitor will indicate a low
resistance and the pointer will move more to the
"0" end of the scale and remain there as long as
the probes are connected. An open capacitor
will show no movement of the pointer when
placed across the terminals of the capacitor.

THERMOSTAT

A cross ambient
thermostat is used
to maintain the
desired comfort level.
The thermostat reacts only
to a change in temperature
at the bulb location.
Important to the
successful operation
of the unit is the position
of the sensing bulb in
relation to the evaporator
(see Figure 8).
RANGE:
Thermostat
(Part No. 618-225-02)
60° F ( ± 2° ) to 90° F( ± 4° )
FIGURE 8
SENSING BULB
LOCATION