Checking Wiring; Checking Thermostat, Wiring & Anticipator; S-3A Thermostat & Wiring; S-3B Cooling Anticipator - Goodman APG 13 Service Instructions Manual

SERVICING
S-2 CHECKING WIRING
HIGH VOLTAGE!
Disconnect ALL power before servicing
or installing this unit. 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
25 feet
50 feet
75 feet
100 feet
125 feet
150 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.
Indoor Blower Motor
With power ON:
WARNING
Line Voltage now present.
1. Set fan selector switch at thermostat to "ON" position.
36
MIN. COPPER WIRE
GAUGE (AWG)
18
16
14
14
12
12
2. With voltmeter, check for 24 volts at wires C and G.
3. No voltage indicates the trouble is in the thermostat or
wiring.
4. Check the continuity of the thermostat and wiring. Repair
or replace as necessary.

S-3B COOLING ANTICIPATOR

The cooling anticipator is a small heater (resistor) in the
thermostat. During the "off" cycle, it heats the bimetal
element helping the thermostat call for the next cooling cycle.
This prevents the room temperature from rising too high
before the system is restarted. A properly sized anticipator
should maintain room temperature within 1 1/2 to 2 degree
range.
The anticipator is supplied in the thermostat and is not to be
replaced. If the anticipator should fail for any reason, the
thermostat must be changed.

S-3C HEATING ANTICIPATOR

The heating anticipator is a wire-wound adjustable heater,
which is energized during the "ON" cycle to help prevent
overheating of the conditioned space.
The anticipator is a part of the thermostat and if it should fail
for any reason, the thermostat must be replaced. See the
following for recommended heater anticipator setting.
To determine the proper setting, use an ammeter to measure
the current on the "W" wire going to the thermostat.
Use an amprobe as shown below. Wrap 10 turns of thermo-
stat wire around the stationary jaw of the amprobe and divide
the reading by 10.
Checking Heat Anticipator Amp Draw
10 TURNS OF
THERMOSTAT WIRE
(From "W" on thermostat)
STATIONARY JAW
OF AMPROBE
READS 4 AMPS
CURRENT DRAW
WOULD BE .4 AMPS