28
L
ABEL
ALL
WIRES
PRIOR
TO
DISCONNECTION
WHEN
SERVICING
CONTROLS
. W
IRING
ERRORS
CAN
CAUSE
IMPROPER
AND
DANGEROUS
OPERATION
. V
ERIFY
PROPER
OPERATION
AFTER
SERVICING
.
CAUTION
W
IRING
H
ARNESS
The wiring harness is an integral part of this furnace. Wires
are color coded for identification purposes. Refer to the
wiring diagram for wire routings. If any of the original wire
as supplied with the furnace must be replaced, it must be
replaced with wiring material having a temperature rating of at
least 105° C. Any replacement wiring must be a copper conduc-
tor.
115 V
OLT
L
INE
C
ONNECTIONS
Before proceeding with electrical connections, ensure that
the supply voltage, frequency, and phase correspond to that
specified on the unit rating plate. Power supply to the fur-
nace must be NEC Class 1, and must comply with all appli-
cable 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 prop-
erly 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.
Connect hot, neutral, and ground wires as shown in the wir-
ing diagram located on the unit’s blower door. For direct
vent applications, the cabinet opening to the junction box
must be sealed air tight using either an UL approved bushing
such as Heyco Liquid Tight or by applying non-reactive UL
approved sealant to bushing.
Line polarity must be observed when making field connec-
tions. Line voltage connections can be made through either
the right or left side panel. The furnace is shipped config-
ured for a right side (left side for counterflows) electrical
connection with the junction box located inside the burner
compartment. To make electrical connections through the
opposite side of the furnace, the junction box must be relo-
cated to the other side of the burner compartment prior to
making electrical connections. To relocate the junction box,
follow the steps shown below.
NOTE:
Wire routing must not interfere with circulator blower
operation, filter removal, or routine maintenance.
J
UNCTION
B
OX
R
ELOCATION
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
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
. US: National Electrical
Code (NEC) ANSI/NFPA 70-2011. In CANADA:
Canadian Electrical Code CSA C22.1.
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.
1. Remove the burner compartment door.
2. Remove and save the two screws securing the junction
box to the side panel.
3. Relocate junction box and associated plugs and
grommets to opposite side panel. Secure with screws
removed in step 2.
WARNING
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
NATIONAL
E
LECTRICAL
C
ODE
.
To ensure proper unit grounding, an earth ground wire
must be connected between the furnace ground screw
located inside the furnace junction box and the electrical
service panel.
NOTE:
Do not use gas piping as an electrical
ground. To confirm proper unit grounding, turn off the electri-
cal 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 ser-
vicing. Do not defeat this switch.
