DEFROST BULB LOCATION (Heat Pump Models Only)

(See Figure 36)

The defrost control bulb must be mounted securely and in the correct location to operate properly.

Figure 36

Defrost Thermostat Bulb

Location (All Heat Pump Models)

Retainer

Slide the bulb end of the thermostat defrost under the retainer as shown

RESISTOR: Heat Anticipator (See Figure 37)

Failure of the resistor will cause prolonged "off" and "on" cycles of the unit. When replacing a resistor, be sure and use the exact replacement. Resistor ratings are as follows:

115 Volt - 5,000 ohms 3 watt

230 Volt - 20,000 ohms 3 watt

Figure 37

Resistor

CAPACITOR, RUN (See Figure 38)

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 motor. 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.

Figure 38

Dual Rated Run Capacitor Hook-up

CAPACITOR - TEST

1.Remove capacitor from unit.

2.Check for visual damage such as bulges, cracks, or leaks. 3. For dual rated, apply an ohmmeter lead to 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 fan motor capacitor.

NOTE: A shorted capacitor will indicate a low resistance and the pointer will move 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.

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Friedrich racservmn service manual Defrost Bulb Location Heat Pump Models Only, CAPACITOR, RUN See Figure, Capacitor Test
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