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17
E
LECTRICAL
C
ONNECTIONS
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.
JUNCTION B OX R ELOCATION
E
DGES
OF
SHEET
METAL
HOLES
MAY
BE
SHARP
.U
SE
GLOVES
AS
A
PRECAUTION
WHEN
REMOVING
HOLE
PLUGS
.
WARNING
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
OR
DEATH
DUE
TO
ELECTRIC
SHOCK
,
DISCONNECT
ELECT RICAL
POWER
BEFORE
INSTALLING
OR
SERVICING
THIS
UNIT
.
WARNING
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.
HIGHVOL TAGE!
T
O
AVOID
THE
RISK
OF
INJURY
,
ELECT RICAL
SHOCK
OR
DEATH
,
THE
FURNACE
MUST
BE
ELECT RICALLY
GROUNDED
IN
ACCORDANCE
WITH
LOCAL
CODES
OR
IN
THEIR
ABSENCE
,
WITH
THE
LATEST
EDITION
OF
THE
N
ATIONAL
E
LECTRIC
C
ODE
.
WARNING
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
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 VOLT T HERMOSTAT W 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. The following figure shows con-
nections for a “heat only” system and “heat/cool system”.
Furnace
Control
Furnace
Control
Remote
Condensing
Unit
Heatin
g
Room
Thermostat
Heating/Cooling
Room Thermostat
WW
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 FURNACE WITH 2-STAGE C ONDENSER F IELD W IRING
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.