Goodmans GSX, GSZ, ASZ Checking Contactor AND/OR Relays, Checking Contactor Contacts, Single Phase

SERVICING

S-7 CHECKING CONTACTOR AND/OR RELAYS

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 compressor contactor and other relay holding coils are wired into the low or line voltage circuits. When the control circuit is energized, the coil pulls in the normally open contacts or opens the normally closed contacts. When the coil is de-energized, springs return the contacts to their normal position.

NOTE: Most single phase contactors break only one side of the line (L1), leaving 115 volts to ground present at most internal components.

1.Remove the leads from the holding coil.

2.Using an ohmmeter, test across the coil terminals.

If the coil does not test continuous, replace the relay or contactor.

T2 T1

CC

VOLT/OHM

METER

L2 L1

Ohmmeter for testing holding coil

Voltmeter for testing contacts

TESTING COMPRESSOR CONTACTOR

(Single Phase)

THREE PHASE

Using a voltmeter, test across terminals:

A.L1-L2, L1-L3, and L2-L3 - If voltage is present, proceed to B. If voltage is not present, check breaker or fuses on main power supply..

B.T1-T2, T1-T3, and T2-T3 - If voltage readings are not the same as in "A", replace contactor.

T3 T2 T1

S-8 CHECKING CONTACTOR CONTACTS

	WARNING	VOLT/OHM	CC
Disconnect ALL power before servicing.		METER
			L3	L2	L1

SINGLE PHASE:

1.Disconnect the wire leads from the terminal (T) side of the contactor.

2.With power ON, energize the contactor.

WARNING

Line Voltage now present.

3.Using a voltmeter, test across terminals.

A. L2 - T1 - No voltage indicates CC1 contacts open. If a no voltage reading is obtained - replace the contactor.

Ohmmeter for testing holding coil

Voltmeter for testing contacts

TESTING COMPRESSOR CONTACTOR

(Three-phase)

S-9 CHECKING FAN RELAY CONTACTS

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.Disconnect wires leads from terminals 2 and 4 of Fan Relay Cooling and 2 and 4, 5 and 6 of Fan Relay Heating.

2.Using an ohmmeter, test between 2 and 4 - should read open. Test between 5 and 6 - should read continuous.

3.With power ON, energize the relays.

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