25
115 V
OLT
L
INE
C
ONNECTIONS
Before proceeding with electrical connections, ensure that the
supply voltage, frequency, and phase correspond to that speci-
fied 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 prop-
erly sized wire, and fuse or circuit breaker. The fuse or circuit
breaker must be sized in accordance with the maximum
overcurrent protection specified on the unit rating plate. An
electrical disconnect must be provided at the furnace loca-
tion.
Connect hot, neutral, and ground wires as shown in the wiring
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 configured
for a right side (left side for counterflows) electrical connec-
tion with the junction box located inside the burner compart-
ment. To make electrical connections through the opposite
side of the furnace, the junction box must be relocated to the
other side of the burner compartment prior to making electri-
cal connections. To relocate the junction box, follow the steps
shown below.
NOTE:
Wire routing must not to 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
.
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 connec-
tions through the opposite side of the furnace, the junction
box must be relocated to the left side prior to making electri-
cal connections. To relocate the junction box, perform the
following steps.
1. Remove the burner compartment door.
2. Remove and save the two screws securing the junc-
tion box to the side panel.
3. Relocate junction box and associated plugs and grom-
mets to opposite side panel. Secure with screws re-
moved 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, 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) con-
nection 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 V
OLT
T
HERMOSTAT
W
IRING
W
IRE
ROUTING
MUST
NOT
INTERFERE
WITH
CIRCULATOR
BLOWER
OPERATION
,
FILTER
REMOVAL
OR
ROUTINE
MAINTENANCE
.
A
REMOVABLE
PLUG
CONNECTOR
IS
PROVIDED
WITH
THE
CONTROL
TO
MAKE
THERMOSTAT
WIRE
CONNECTIONS
. T
HIS
PLUG
MAY
BE
REMOVED
,
WIRE
CONNECTIONS
MADE
TO
THE
PLUG
,
AND
REPLACED
. I
T
IS
RECOMMENDED
THAT
MULTIPLE
WIRES
INTO
A
SINGLE
TERMINAL
BE
CONNECTED
WITH
A
WIRE
NUT
AND
ONLY
ONE
WIRE
BE
INSERTED
IN
THE
LOW
VOLT
CONNECTOR
. F
AILURE
TO
DO
SO
MAY
RESULT
IN
INTERMITTENT
OPERATION
.
STRONGLY
IMPORTANT NOTE
D
IP
SWITCH
#13 MUST
BE
SET
TO
MATCH
THERMOSTAT
TYPE
. T
O
USE
THE
CTK01
COMMUNICATING
THERMOSTAT
,
DIP
SWITCH
#13
MUST
BE
SET
TO
ON
POSITION
. T
HIS
IS
ALSO
THE
CORRECT
SETTING
FOR
A
NON
-
COMMUNICATING
2-
STAGE
THERMOSTAT
. T
O
USE
CTK02**, CTK03
OR
CTK04
MODULATING
THERMOSTAT
,
CHECK
TO
MAKE
SURE
DIP
SWITCH
#13
IS
IN
THE
OFF
POSITION
(
FACTORY
POSITION
). T
HIS
IS
ALSO
THE
CORRECT
POSITION
WHEN
USING
A
NON
-
COMMUNICATING
SINGLE
-
STAGE
THERMOSTAT
.
IMPORTANT NOTE
OPERATION