Installation Guide
14
115 VOLT LINE CONNECTIONS
Before proceeding with electrical connections, ensure that the
supply voltage, frequency, and phase correspond to that spec-
ifi ed 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 protection specifi ed on the unit rating plate. An
electrical disconnect must be provided at the furnace location.
Connect hot, neutral, and ground wires as shown in the wiring
diagram located on the unit’s blower door.
Line polarity must be observed when making fi eld connections.
Line voltage connections can be made through either the right
or left side panel. The furnace is shipped confi gured for a right
side electrical connection with the junction box located inside
the burner compartment (blower compartment for downfl ows).
To make electrical connections through the opposite side of
the furnace, the junction box must be relocated to the other
side of the burner (or blower) compartment prior to making
electrical connections. To relocate the junction box, follow
the steps shown below.
NOTE: Wire routing must not to interfere with circulator blower
operation, fi lter removal, or routine maintenance.
JUNCTION BOX RELOCATION
E
DGES
OF
SHEET
METAL
HOLES
MAY
BE
SHARP
. U
SE
GLOVES
AS
A
PRECAUTION
WHEN
REMOVING
HOLE
PLUGS
.
WARNING
T
O
PREVENT
PERSONAL
INJURY
OR
DEATH
DUE
TO
ELECTRIC
SHOCK
,
DISCONNECT
ELECTRICAL
POWER
BEFORE
INSTALLING
OR
SERVICING
THIS
UNIT
.
WARNING
1. Remove both doors from the furnace.
2. Remove and save the screws holding the junc tion box
to the right side of the furnace.
3. Attach the junction box to the left side of the fur nace,
using the screws removed in step 2.
4. Check the location of the wiring. Confi rm that it will
not be damaged by heat from the burners or by the
rotation of the fan. Also confi rm that wiring location will
not interfere with fi l ter removal or other maintenance.
IMPORTANT NOTE: To avoid possible equipment malfunc-
tion, route the low voltage wires to avoid interference with fi lter
removal or other maintenance.
HIGH VOLTAGE !
T
O
AVOID
THE
RISK
OF
INJURY
,
ELECTRICAL
SHOCK
OR
DEATH
,
THE
FURNACE
MUST
BE
ELECTRICALLY
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
junction box all the way back to the electrical panel. NOTE:
Do not use gas piping as an electrical ground. To confi rm
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.
GAS SUPPLY AND PIPING
The furnace rating plate includes the approved furnace gas
input rating and gas types. The furnace must be equipped to
operate on the type of gas applied. This includes any con-
version kits required for alternate fuels and/or high altitude.
CAUTION
T
O
PREVENT
UNRELIABLE
OPERATION
OR
EQUIPMENT
DAMAGE
,
THE
INLET
GAS
SUPPLY
PRESSURE
MUST
BE
AS
SPECIFIED
ON
THE
UNIT
RATING
PLATE
WITH
ALL
OTHER
HOUSEHOLD
GAS
FIRED
APPLIANCES
OPERATING
.
Inlet gas supply pressures must be maintained within the
ranges specifi ed in the following table. The supply pressure
must be constant and available with all other household gas
fi red appliances operating. The minimum gas supply pres-
sure must be maintained to prevent unreliable ignition. The
maximum must not be exceeded to prevent unit overfi ring.
NOTE: Do not remove the gas valve inlet plug before the gas
line is installed. Replace if water or debris has been introduced.
Natural Gas Minimum: 4.5" w.c. Maximum: 10.0" w.c.
Propane Gas Minimum: 11.0" w.c. Maximum: 13.0" w.c.
INLET GAS SUPPLY PRESSURE
NOTE: Adjusting the minimum supply pressure below the
limits in the above table could lead to unreliable ignition. Gas
input to the burners must not exceed the rated input shown
on the rating plate. Overfi ring of the fur nace can result in
premature heat exchanger failure. Gas pressures in excess
of 13 inch es water column can also cause permanent damage
to the gas valve.