Iring Arness; 115 Volt Line Connections; Fossil Fuel Applications; Junction Box Relocation - Goodman *MH8 Installation Instructions Manual

W W W W W H H H H H
IRING IRING IRING IRING IRING ARNESS ARNESS ARNESS ARNESS ARNESS
The wiring harness is an integral part of this furnace. Field alteration
to comply with electrical codes should not be required. Wires are
color coded for identification purposes. Refer to the wiring dia-
gram for wire routings. If any of the original wire as supplied with
the furnace must be replaced, it must be replaced with wiring ma-
terial having a temperature rating of at least 105° C. Any replace-
ment wiring must be a copper conductor.
115 V 115 V 115 V 115 V 115 V L L L L L C C C C C
OLT OLT OLT OLT OLT INE INE INE INE INE ONNECTIONS ONNECTIONS ONNECTIONS ONNECTIONS ONNECTIONS
Before proceeding with electrical connections, ensure that the sup-
ply voltage, frequency, and phase correspond to that specified on
the unit rating plate. Power supply to the furnace must be NEC
Class 1, and must comply with all applicable codes. The furnace
must be electrically grounded in accordance with local codes or, in
their absence, with the latest edition of The National Electric Code,
ANSI NFPA 70 and/or The Canadian Electric Code CSA C22.1.
Use a separate fused branch electrical circuit containing properly
sized wire, and fuse or circuit breaker. The fuse or circuit breaker
must be sized in accordance with the maximum overcurrent pro-
tection specified on the unit rating plate. An electrical disconnect
must be provided at the furnace location.
Line voltage wiring must enter into the junction box provided with
the furnace.
NOTE: Line polarity must be observed when making field NOTE: NOTE: NOTE: NOTE:
connections.
F F F F F F F F F F A A A A A
OSSIL OSSIL OSSIL OSSIL OSSIL UEL UEL UEL UEL UEL PPLICATIONS PPLICATIONS PPLICATIONS PPLICATIONS PPLICATIONS
This furnace can be used in conjunction with a heat pump in a fossil
fuel application. A fossil fuel application refers to a combined gas
furnace and heat pump installation which uses an outdoor tem-
perature sensor to determine the most cost efficient means of heat-
ing (heat pump, gas furnace, or both).
A heat pump thermostat with two stages of heat is required to prop-
erly use a furnace in conjunction with a heat pump. Refer to the
fossil fuel kit installation instructions for additional thermostat re-
quirements.
Strictly follow the wiring guidelines in the fossil fuel kit installation
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 J J J J B B B B B R R R R R
UNCTION UNCTION OX OX ELOCATION ELOCATION
UNCTION UNCTION UNCTION OX OX OX ELOCATION ELOCATION 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
WARNING
. U
MAY BE SHARP SE GLOVES AS
.
HOLE PLUGS
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 connections. To relocate the
junction box, perform the following steps.
T
O PREVENT PERSONAL
DISCONNECT ELECTRICAL
.
UNIT
1. Remove both doors from the furnace.
2. Remove and save the screws holding the junction box to
the left 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 right 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 NOTE: NOTE: NOTE: NOTE:
through the supplied wire tabs when rotating junction box to the
left side.
Low voltage wires may be connected to the terminal strip.
IMPOR IMPOR IMPORT T T T T ANT NO ANT NO ANT NOTE: ANT NO
IMPOR IMPOR ANT NO
the low voltage wires to avoid interference with filter removal or
other maintenance.
HIGH VOLTAGE !
T
O AVOID THE
,
DEATH THE FURNACE
GROUNDED IN ACCORDANCE
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 junction box
all the way back to the electrical panel. NOTE:
A
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.
15
E E E E E
L E C T R I C A L L E C T R I C A L L E C T R I C A L L E C T R I C A L L E C T R I C A L
WARNING
INJURY OR DEATH DUE
POWER BEFORE INSTALLING
TE: TE: TE: To avoid possible equipment malfunction, route
TE:
WARNING
,
RISK OF INJURY ELECTRICAL SHOCK
MUST BE ELECTRICALLY
WITH LOCAL CODES
,
WITH THE LATEST EDITION OF THE
C .
ODE
C C C C C
O N N E C T I O N S O N N E C T I O N S O N N E C T I O N S O N N E C T I O N S O N N E C T I O N S
,
TO ELECTRIC SHOCK
OR SERVICING THIS
OR
OR IN
NOTE: Do not use gas NOTE: NOTE: NOTE: