Friedrich 60 Hz Manuale Utente

5

FAN MOTOR (Figure 4)

A 230 volt single phase permanent split capacitor motor is 

used to drive the evaporator blower and condenser fan. A 
running capacitor is wired across the start and run terminals 
of the motor.

The motor is totally enclosed and is protected with a line volt-

age overload located internally of the motor. The motor shaft 
is stainless steel to resist corrosion.

Disconnect power to the unit.

 

1.  Determine that the capacitor is serviceable.

 

2.  Disconnect the black lead from the circuit board.

 

3.  Apply "live" test cord leads to the common terminal of 

the capacitor and the black lead. The motor should run 
at high speed.

SOLID STATE RELAY (Figure 5)

Two 50 amp rated 208/230 volt solid state relays are used to 

energize the compressor and fan motor. Terminals 3 and 4 are the 
208/230 volt line side. Terminals 1 and 2 are load side contacts.

SYSTEM CONTROL SWITCH (Figure 6)

This switch is double pole, single throw. Check for continuity 

between terminals 2 and 3, and 5 and 6.

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.)

RED DOT

RUN CAPACITOR

FAN
MOTOR

COMPRESSOR

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 defl ection on the pointer, then gradually move back 
to infi nity.

4.  Reverse the leads of the probe and momentarily touch the 

capacitor terminals. The defl ection of the pointer should be 
two times that of the fi rst 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. 

LED indicates 

contacts closed 

when lit

Line side

Load side