SERVICING
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.
START
CAPACITOR
RED 10
VIOLET 20
YELLOW 12
| START |
|
| RELAY |
|
| ORANGE 5 |
|
MOC MRHE NAF | T2 | T1 |
| ||
RUN | L2 L1 | |
CAPACITOR
CONTACTOR
HARD START KIT WIRING
S-15A RESISTANCE CHECK
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.
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).
B.Shorted - indicator swings to zero and stops there - replace.
C.Open - no reading - replace. (Start capacitor would read resistor resistance.)
S-15B CAPACITANCE CHECK
Using a hookup as shown below, take the amperage and voltage readings and use them in the formula:
VOLTMETER
15 AMP
FUSE
AMMETER
CAPACITOR
TESTING CAPACITANCE
WARNING
Discharge capacitor through a 20 to 30 OHM resistor before handling.
Capacitance (MFD) = 2650 X Amperage
Voltage
42
