29
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 elec-
trical 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 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
FURNACE
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
BE
JOINED
WITH
A
WIRE
NUT
AND
A
SINGLE
CONDUCTOR
BE
INSERTED
UNDER
THE
TERMINAL
SCREW
. F
AILURE
TO
DO
SO
MAY
RESULT
IN
INTERMITTENT
OPERATION
.
STRONGLY
-
HEAT SET-UP DIP SWITCH
DIP
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
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
Cooling’. Refer to the following figures for proper connec-
tions to the integrated control module.
Low voltage connections can be made through either the right
or left side panel. Thermostat wiring entrance holes are lo-
cated in the blower compartment. The following figure shows
connections for a “heat/cool system”.
This furnace is equipped with a 40 VA transformer to facilitate
use with most cooling equipment. Consult the wiring dia-
gram, located on the blower compartment door, for further
details of 115 Volt and 24 Volt wiring.
NOTE:
Use of cooling ramping profiles and dehum feature
requires a jumper between Y1 and O when a straight cool-
ing unit is used.
T
HERMOSTAT
“R”
REQUIRED
IF
OUTDOOR
UNIT
IS
EQUIPPED
WITH
A
C
OMFORT
A
LERT
™
MODULE
OR
IF
THE
OUTDOOR
UNIT
IS
A
PART
OF
THE
C
OMFORT
N
ET
™
FAMILY
OF
EQUIPMENT
.
IMPORTANT NOTE
