Volt Thermostatw; Gme8 Furnace With 2-S; Iring; Field Wiring - Goodman MH8 Installation Instructions Manual

A heat pump thermostat with two stages of heat is required to
properly use a furnace in conjunction with a heat pump. Refer
to the fossil fuel kit installation instructions for additional ther-
mostat requirements.
Strictly follow the wiring guidelines in the fossil fuel kit installa-
tion instructions. All furnace connections must be made to the
furnace integrated control module and the FURNACE terminal
strip on the fossil fuel control board.
J B R
UNCTION OX ELOCATION
E
DGES OF SHEET METAL HOLES
PRECAUTION WHEN REMOVING
Line voltage connections can be made through either the right
or left side panel. The furnace is shipped configured for a right
side electrical connection. To make electrical connections
through the opposite side of the furnace, the junction box must
be relocated to the left side prior to making electrical connec-
tions. To relocate the junction box, perform the following steps.
T
O PREVENT PERSONAL INJURY
DISCONNECT ELECTRICAL POWER
.
UNIT
1. Remove both doors from the furnace.
2. Remove and save the screws holding the junction box to
the right side of the furnace.
3. Models that have the junction box located in the burner
compartment will need to move the junction box directly
over.
4. Attach the junction box to the left side of the furnace,
using the screws removed in step 2.
5. Check the location of the wiring. Confirm that it will not
be damaged by heat from the burners or by the rotation
of the fan. Also confirm that wiring location will not
interfere with filter removal or other maintenance.
After the junction box is in the desired location, use washers to
connect field-supplied conduit to the junction box in accordance
with NEC and local codes. Connect hot, neutral, and ground
wires as shown in the furnace wiring diagram. The wires and
ground screw are located in the furnace junction box.
NOTE: In downflow applications the power leads should be
routed through the supplied wire tabs when rotating junction
box to the left side.
Low voltage wires may be connected to the terminal strip.
IMPORTANT NOTE: To avoid possible equipment malfunction,
route the low voltage wires to avoid interference with filter re-
moval or other maintenance.
WARNING
. U
MAY BE SHARP SE GLOVES AS
.
HOLE PLUGS
WARNING
OR DEATH DUE TO ELECTRIC SHOCK
BEFORE INSTALLING OR SERVICING
HIGH VOLTAGE !
T
O AVOID THE
,
DEATH THE FURNACE
GROUNDED IN
THEIR ABSENCE
N E
ATIONAL LECTRIC
To ensure proper unit grounding, the ground wire should run
from the furnace ground screw located inside the furnace junc-
tion box all the way back to the electrical panel. NOTE: Do
not use gas piping as an electrical ground. To confirm proper
A
unit grounding, turn off the electrical power and perform the
following check.
1. Measure resistance between the neutral (white)
connection and one of the burners.
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
OLT HERMOSTAT
NOTE: Wire routing must not interfere with circulator blower
,
operation, filter removal, or routine maintenance.
THIS
Low voltage connections can be made through either the right
or left side panel. Thermostat wiring entrance holes are located
in the blower compartment. The following figure shows con-
nections for a "heat only" system and "heat/cool system".
Heating
Room
Thermostat
W
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.
GME8 F
URNACE WITH
The GME8 model furnaces may be used with a 2-stage
outdoor air conditioner. A two stage cooling/single stage gas
heat thermostat is required, in addition to a field supplied
relay. The relay must have a 24VAC coil and contacts rated
for up to 1 horse power at 125VAC.
17
E C
LECTRICAL
WARNING
,
RISK OF INJURY ELECTRICAL SHOCK
MUST BE ELECTRICALLY
ACCORDANCE WITH LOCAL CODES
,
WITH THE LATEST EDITION OF
C .
ODE
W

IRING

Heating/Cooling
Room Thermostat
W
Furnace
Control
2-S C
TAGE ONDENSER
ONNECTIONS
OR
OR IN
THE
Remote
Condensing
Unit
Furnace
Control
F W
IELD IRING