Volt Thermostat Wiring; S H A; Setting The Heat Anticipator; 115 Volt Line Connection Of Accessories (Humidifier And Electronic Air Cleaner ) - Goodman GMS8 Installation & Operating Instructions Manual

2. Resistance should measure 10 ohms or less.
This furnace is equipped with a blower door interlock switch
which interrupts unit voltage when the blower door is opened for
servicing. Do not defeat this switch.
24 V T W
OLT HERMOSTAT IRING
NOTE: Wire routing must not interfere with circulator blower
operation, filter removal, or routine maintenance.
Low voltage connections can be made through either the right or
left side panel. Thermostat wiring entrance holes are located in
the blower compartment.
connections for a "heat only" system and "heat/cool system".
Heating
Room Thermostat
W
R Y
R
C
G
W
Furnace
Control
Typical Field Wiring (24 VAC Control Circuit)
This furnace is equipped with a 40 VA transformer to facilitate
use with most cooling equipment. Consult the wiring diagram,
located on the blower compartment door, for further details of
115 Volt and 24 Volt wiring.
A single-stage thermostat with only one heating stage can be
used to control this furnace.
S H A
ETTING THE EAT NTICIPATOR
The following method should be used in measuring the amp
draw of the control circuit to assure proper adjustment of the
thermostat heat anticipator
R
R
• Wrap the "R" leg around a clip-on amp meter 10 times.
• Energize the furnace in the heat mode.
• Record the reading.
• Divide this reading by 10.
• Set the heat anticipator on the thermostat to match this
reading.
Example: If the reading on the amp meter is "4", divide this by 10.
The anticipator setting will be .4 amps.
The following figure shows
Heating/Cooling
Room Thermostat
Y
W
G R
Y Y
C
R
C C
G
Remote
W
Condensing
Unit
Furnace
Control
115 V L C
OLT INE ONNECTION OF
E A C
AND LECTRONIC IR
T
O AVOID PERSONAL INJURY, ELECTRICAL SHOCK OR DEATH, DISCONNECT
ELECTRICAL POWER BEFORE SERVICING OR CHANGING ANY ELECTRICAL
WIRING.
The furnace integrated control module is equipped with line
voltage accessory terminals for controlling power to an optional
field-supplied humidifier and/or electronic air cleaner.
The accessory load specifications are as follows:
Humidifier
Electronic Air Cleaner
Turn OFF power to the furnace before installing any accessories.
Follow the humidifier or air cleaner manufacturers' instructions
for locating, mounting, grounding, and controlling these
accessories. Accessory wiring connections are to be made
through the 1/4" quick connect terminals provided on the furnace
integrated control module. The humidifier and electronic air
cleaner hot and neutral terminals are identified as HUM and
EAC. All field wiring must conform to applicable codes.
Connections should be made as shown in the following
illustration.
Hot 120 VAC
Optional
Accessories
If it is necessary for the installer to supply additional line voltage
wiring to the inside of the furnace, the wiring must conform to all
local codes, and have a minimum temperature rating of 105°C.
All line voltage wire splices must be made inside the furnace
junction box.
The integrated control module humidifier terminals (HUM) are
energized with 115 volts whenever the induced draft blower is
energized. The integrated control module electronic air cleaner
terminals (EAC) are energized with 115 volts whenever the
circulator blower is energized.
24 V H
AC UM
1. 24 VAC Hum - A ¼" piggy back quick connect terminal on
the pressure switch provides 24 VAC humidifier control.
This terminal will be powered any time the pressure switch
is closed. To connect 24 VAC hum, connect 24vac line of
humidifier to piggyback on the pressure switch. The com
side of the humidfier to C on the terminal strip on the
control board (or to com side to 24VAC transformer). Do
not connect 115V humidifier to these terminals.
T
WINNING
A twin terminal located on the thermostat terminal strip can be
used to twin two furnaces. This twin terminal synchronizes the
16
A (H
CCESSORIES
)
LEANER
WARNING
1.0 Amp maximum at 120 VAC
1.0 Amp maximum at 120 VAC
Control Module
Neutral 120 VAC
{
Air Cleaner
Humidifier
UMIDIFIER