Amana GSC13060 Service Manual download pdf (Page 25)

SERVICING

S-13 CHECKING LOW PRESSURE CONTROL

The low pressure control senses the pressure in the suction

line and will open its contacts on a drop in pressure. The low

pressure control will automatically reset itself with a rise in

pressure.

The low pressure control is designed to cut-out (open) at

approximately 50 PSIG. It will automatically cut-in (close) at

approximately 85 PSIG.

Test for continuity using a VOM and if not as above, replace

the control.

S-15 CHECKING CAPACITOR

CAPACITOR, RUN

A run capacitor is wired across the auxiliary and main

windings of a single phase permanent split capacitor motor.

The capacitors primary function is to reduce the line current

while greatly improving the torque characteristics of a motor.

This is accomplished by using the 90° phase relationship

between the capacitor current and voltage in conjunction with

the motor windings, so that the motor will give two phase

operation when connected to a single phase circuit. The

capacitor also reduces the line current to the motor by

improving the power factor.

The line side of this capacitor is marked with "COM" and is

wired to the line side of the circuit.

CAPACITOR, START

SCROLL COMPRESSOR MODELS

In most cases hard start components are not required on

Scroll compressor equipped units due to a non-replaceable

check valve located in the discharge line of the compressor.

However, in installations that encounter low lock rotor volt-

age, a hard start kit can improve starting characteristics and

reduce light dimming within the home. Only hard start kits

approved by Amana

or Copeland should be used. "Kick

Start" and/or "Super Boost" kits are not approved start assist

devices.

The discharge check valve closes off high side pressure to the

compressor after shut down allowing equalization through the

scroll flanks. Equalization requires only about ½ second.

To prevent the compressor from short cycling, a Time Delay

Relay (Cycle Protector) has been added to the low voltage

circuit.

RELAY, START

A potential or voltage type relay is used to take the start

capacitor out of the circuit once the motor comes up to speed.

This type of relay is position sensitive. The normally closed

contacts are wired in series with the start capacitor and the

relay holding coil is wired parallel with the start winding. As

the motor starts and comes up to speed, the increase in

voltage across the start winding will energize the start relay

holding coil and open the contacts to the start capacitor.

Two quick ways to test a capacitor are a resistance and a

capacitance check.

S-12 CHECKING HIGH PRESSURE CONTROL

WARNING

HIGH VOLTAGE!

Disconnect ALL power before servicing or installing.

Multiple power sources may be present. Failure to do

so may cause property damage, personal injury

or death.

The high pressure control capillary senses the pressure in the

compressor discharge line. If abnormally high condensing

pressures develop, the contacts of the control open, breaking

the control circuit before the compressor motor overloads.

This control is automatically reset.

1. Using an ohmmeter, check across terminals of high

pressure control, with wire removed. If not continuous,

the contacts are open.

3. Attach a gauge to the dill valve port on the base valve.

With power ON:

WARNING

Line Voltage now present.

4. Start the system and place a piece of cardboard in front

of the condenser coil, raising the condensing pressure.

5. Check pressure at which the high pressure control cuts-

out.

If it cuts-out at 610 PSIG ± 10 PSIG, it is operating normally

(See causes for high head pressure in Service Problem

Analysis Guide). If it cuts out below this pressure range,

replace the control.

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Amana GSC13060 Service Manual Page 25

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