Installations Instructions
29
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 ap-
proved 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.
JUNCTION BOX RELOCATION
E
DGES
OF
SHEET
M ETAL
HOLES
M AY
BE
SHARP
. U
SE
GLOVES
AS
A
PRECAUTION
W HEN
REM OVING
HOLE
PLUGS
.
WARNING
T
O
PREVENT
PERSONAL
INJURY
OR
DEATH
DUE
TO
ELECTRIC
SHOCK
,
DISCONNECT
ELECTRICAL
POW ER
BEFORE
INSTALLING
OR
SERVICING
THIS
UNIT
.
WARNING
HIGH VOLTAGE !
T
O
AVOID
THE
RISK
OF
INJURY
,
ELECTRICAL
SHOCK
OR
DEATH
,
THE
FURNACE
M UST
BE
ELECTRICALLY
GROUNDED
IN
ACCORDANCE
W ITH
LOCAL
CODES
OR
IN
THEIR
ABSENCE
,
W ITH
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
M UST
BE
ELECTRICALLY
GROUNDED
IN
ACCORDANCE
W ITH
LOCAL
CODES
OR
,
IN
THEIR
ABSENCE
,
W ITH
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 in-
side the furnace junction box and the electrical service panel.
NOTE: Do not use gas piping as an electrical ground. To con-
firm 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 ser-
vicing. Do not defeat this switch.
24 VOLT THERMOSTAT WIRING
W
IRE
ROUTING
M UST
NOT
INTERFERE
W ITH
CIRCULATOR
BLOW ER
OPERATION
,
FILTER
REM OVAL
OR
ROUTINE
M AINTENANCE
.
A
REM OVABLE
PLUG
CONNECTOR
IS
PROVIDED
W ITH
THE
FURNACE
CONTROL
TO
M AKE
THERM OSTAT
W IRE
CONNECTIONS
. T
HIS
PLUG
M AY
BE
REM OVED
,
W IRE
CONNECTIONS
M ADE
TO
THE
PLUG
,
AND
REPLACED
. I
T
IS
RECOM M ENDED
THAT
M ULTIPLE
W IRES
BE
JOINED
W ITH
A
W IRE
NUT
AND
A
SINGLE
CONDUCTOR
BE
INSERTED
UNDER
THE
TERM INAL
SCREW
. F
AILURE
TO
DO
SO
M AY
RESULT
IN
INTERM ITTENT
OPERATION
.
STRONGLY
-
HEAT SET-UP DIP SWITCH DIP
SW ITCH
#13 M UST
BE
SET
TO
M ATCH
THERM OSTAT
TYPE
. T
O
USE
THE
CTK01
COM M UNICATING
THERM OSTAT
, DIP
SW ITCH
#13
M UST
BE
SET
TO
ON
POSITION
. T
HIS
IS
ALSO
THE
CORRECT
SETTING
FOR
A
NON
-
COM M UNICATING
2-
STAGE
THERM OSTAT
. T
O
USE
CTK02* * , CTK03* *
OR
CTK04* *
M ODULATING
THERM OSTAT
,
CHECK
TO
M AKE
SURE
DIP
SW ITCH
#13
IS
IN
THE
OFF
POSITION
(
FACTORY
POSITION
). T
HIS
IS
ALSO
THE
CORRECT
POSITION
W HEN
USING
A
NON
-
COM M UNICATING
SINGLE
-
STAGE
THERM OSTAT
.
IMPORTANT NOTE
When installed with a non-communicating thermostat, the
furnace integrated control module provides terminals for both
“W1” and “W2”, and “Y1” and “Y2” thermostat connections.
This allows the furnace to support the following system appli-
cations: ‘Two-Stage Heating Only’, ‘Two-Stage Heating with
Single Stage Cooling’, and ‘Two-Stage Heating with Two-Stage