PRODUCT DESIGN
61
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 maxi-
mum overcurrent protection specified on the unit rating plate.
An electrical disconnect must be provided at the furnace
location.
NOTE: Line polarity must be observed when making field
connections.
W
A
R
N
I
N
G
IN 90% FURNACE UPRIGHT UPFLOW INSTALLATIONS, THE DRAIN TRAP MUST
BE MOUNTED ON THE OPPOSITE SIDE OF THE UNIT FROM THE JUNCTION
BOX.
THIS WILL REDUCE THE RISK OF WATER REACHING THE JUNCTION
BOX IN THE EVENT OF A BLOCKED DRAIN CONDITION.
Connect hot, neutral, and ground wires as shown in the wir-
ing diagram located on the unit’s blower door. Line polarity
must be observed when making field connections. Line volt-
age connections can be made through either the right or left
side panel.
The 80% and 90% furnaces are shipped configured for
a left side electrical connection with the junction box
located inside the burner compartment. To make elec-
trical connections through the opposite side of the fur-
nace, the junction box must be relocated to the other
side of the burner compartment prior to making elec-
trical connections, refer to the following figures.
CAUTION
E
DGES OF SHEET METAL HOLES MAY BE SHARP.
U
SE GLOVES A PRECAUTION
WHEN REMOVING HOLE PLUGS.
STANDARD
JUNCTION BOX
LOCATION
ALTERNATE
JUNCTION BOX
LOCATION
80% Furnace Junction Box Relocation
*
*
*
**
*
*
*
*
STANDARD
JUNCTION BOX
LOCATION
ALTERNATE
JUNCTION BOX
LOCATION
90% Furnace Junction Box Relocation
NOTE: Wire routing must not interfere with circulator blower
operation, filter removal, or routine maintenance.
WARNING
TO AVOID THE RISK OF ELECTRICAL SHOCK, INJURY, OR DEATH, THE
FURNACE MUST BE ELECTRICALLY GROUNDED IN ACCORDANCE WITH LOCAL
CODES OR, IN THEIR ABSENCE, WITH THE LATEST EDITION OF THE
NATIONAL ELECTRIC CODE.
115 VOLT LINE CONNECTION OF ACCESSORIES
(HUMIDIFIER AND ELECTRONIC AIR CLEANER)
WARNING
HIGH VOLTAGE
D
ISCONNECT
ALL
POWER BEFORE SERVICING OR
CHANGING ANY ELECTRICAL WIRING.
MULTIPLE POWER
SOURCES MAY BE PRESENT.
FAILURE TO DO SO MAY CAUSE
PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
All 80% & 90% furnaces have an integrated ignition con-
trol that is equipped with line voltage accessory termi-
nals for controlling power to an optional field-supplied
humidifier and/or electronic air cleaner.
Accessory Load Specifications
Humidifier 1.0 Amp maximum at 120 VAC
Electronic Air Cleane
1.0 Amp maximum at 120 VAC
Turn OFF power to the furnace before installing any acces-
sories. Follow the humidifier or air cleaner manufacturers’
instructions for locating, mounting, grounding, and control-
ling these accessories.
HUMIDIFIER WIRING
On 80% & 90% furnaces, accessory wiring connections are
to be made through the 1/4" quick connect terminals pro-
vided on the furnace integrated control module. The Humidi-
fier 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
below.
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