GSX14 Service Manual

ManualsBrandsGoodman ManualsAir Conditioner Condensers5 Ton 14 SEER Central Air Conditioner w/ R410A Refrigerant

SERVICING

S-1 CHECKING VOLTAGE

1. Remove outer case, control panel cover, etc., from unit

being tested.

With power ON:

WARNING

Line Voltage now present.

2. Using a voltmeter, measure the voltage across terminals

L1 and L2 of the contactor for the condensing unit or at the

field connections for the air handler or heaters.

ComfortNet

Ready Condensing Units: Measure the

voltage across the L1 and L2 lugs on the unitary (UC)

control.

3. No reading - indicates open wiring, open fuse(s) no power

or etc., from unit to fused disconnect service. Repair as

needed.

4. With ample voltage at line voltage connectors, energize

the unit.

5. Measure the voltage with the unit starting and operating,

and determine the unit Locked Rotor Voltage. NOTE: If

checking heaters, be sure all heating elements are

energized.

Locked Rotor Voltage is the actual voltage available at

the compressor during starting, locked rotor, or a stalled

condition. Measured voltage should be above minimum

listed in chart below.

To measure Locked Rotor Voltage attach a voltmeter to

the run "R" and common "C" terminals of the compressor,

or to the T

and T

terminals of the contactor. Start the unit

and allow the compressor to run for several seconds, then

shut down the unit. Immediately attempt to restart the

unit while measuring the Locked Rotor Voltage.

ComfortNet Ready Condensing Units: To measure the

Locked Rotor Voltage, attach a voltmeter to the run "R"

and common "C" terminals of the compressor or across

the "R" and "C" lugs on the unitary (UC) control. Start the

unit and allow the compressor to run for several seconds,

then shut down the unit. Immediately attempt to restart

the unit while measuring the Locked Rotor Voltage.

6. Locked rotor voltage should read within the voltage tabu-

lation as shown. If the voltage falls below the minimum

voltage, check the line wire size. Long runs of undersized

wire can cause low voltage. If wire size is adequate, notify

the local power company in regard to either low or high

voltage.

Unit Supply Voltage

Voltage Min. Max

208/230 19

253

460 41

506

NOTE: When operating electric heaters on voltages other

than 240 volts, refer to the System Operation section on

electric heaters to calculate temperature rise and air flow.

Low voltage may cause insufficient heating.

S-2 CHECKING WIRING

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. Check wiring visually for signs of overheating, damaged

insulation and loose connections.

2. Use an ohmmeter to check continuity of any suspected

open wires.

3. If any wires must be replaced, replace with comparable

gauge and insulation thickness.

S-3 CHECKING THERMOSTAT, WIRING, AND

ANTICIPATOR

THERMOSTAT WIRE SIZING CHART

LENGTH OF RUN

MIN. COPPER WIRE

GAUGE (AWG)

25 feet 18

50 feet 16

75 feet 14

100 feet 14

125 feet 12

150 feet 12

ComfortNet Ready Models

1. Legacy Thermostat Wiring: The maximum wire length for

18 AWG thermostat wire is 100 feet.

2. Communicating Thermostat Wiring: The maximum wire

length for 18 AWG thermostat wire is 100 feet.

S-3A THERMOSTAT AND WIRING

WARNING

Line Voltage now present.

With power ON, thermostat calling for cooling

1. Use a voltmeter to check for 24 volts at thermostat wires

C and Y in the condensing unit control panel.

2. No voltage indicates trouble in the thermostat, wiring or

external transformer source.

3. Check the continuity of the thermostat and wiring. Repair

or replace as necessary.