SERVICING
36
START
RELAY
C
O
M
H
E
R
M
F
A
N
RUN
CAPACITOR
CONTACTOR
T2 T1
L1
L2
START
CAPACITOR
RED 10
VIOLET 20
YELLOW 12
ORANGE 5
HARD START KIT WIRING
S-15A RESISTANCE CHECK
1. Discharge capacitor and remove wire leads.
WARNING
Discharge capacitor through a 20 to 30 OHM
resistor before handling.
OHMMETER
CAPACITOR
TESTING CAPACITOR RESISTANCE
2. Set an ohmmeter on its highest ohm scale and connect
the leads to the capacitor -
A. Good Condition - indicator swings to zero and slowly
returns to infinity. (Start capacitor with bleed resistor will
not return to infinity. It will still read the resistance of the
resistor).
S-11 CHECKING LOSS OF CHARGE PROTECTOR
(Heat Pump Models)
The loss of charge protector senses the pressure in the liquid
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 7 PSIG. It will automatically cut-in (close) at
approximately 25 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
®
brand 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.
