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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 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.
24 V
T
W
OLT
HERMOSTAT
IRING
When installed with a non-communicating thermostat, the fur-
nace 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 applications: '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 connections to the integrated control module.
Low voltage connections can be made through either the right or left
side panel. Thermostat wiring entrance holes are located 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 diagram, 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 re-
quires a jumper between Y1 and O when a straight cooling unit
is used.
The auxiliary contacts are shipped with a factory installed jumper.
As an option, the auxiliary contacts may be wired to a normally
closed float switch. In the event of open contacts, the gas heat
and cooling will be disabled until the condition is corrected.
These are 24 volt terminals powered internally, do not apply
another voltage source to these terminals.
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
,
BE REMOVED
WIRE CONNECTIONS MADE TO THE PLUG
. I
STRONGLY
REPLACED
T IS
RECOMMENDED THAT MULTIPLE WIRES
BE JOINED WITH A WIRE NUT AND A SINGLE CONDUCTOR BE INSERTED
. F
UNDER THE TERMINAL SCREW
.
INTERMITTENT OPERATION
IMPORTANT NOTE
HEAT SET-UP DIP SWITCH
-
. T
MATCH THERMOSTAT TYPE
O USE THE
, DIP
#13
THERMOSTAT
SWITCH
ALSO THE CORRECT SETTING FOR A NON
. T
CTK02**, CTK03**
THERMOSTAT
O USE
,
MODULATING THERMOSTAT
CHECK TO MAKE SURE
OFF
(
IN THE
POSITION
FACTORY POSITION
-
POSITION WHEN USING A NON
COMMUNICATING SINGLE
.
THERMOSTAT
IMPORTANT NOTE
T
"R"
HERMOSTAT
REQUIRED IF OUTDOOR UNIT IS EQUIPPED WITH A
C
A
™
OMFORT
LERT
MODULE OR IF THE OUTDOOR UNIT IS A PART OF
C
N
™
THE
OMFORT
ET
FAMILY OF EQUIPMENT
24 V THERMOSTAT CONNECTIONS
Low Voltage Connections with Auxiliary Terminals
.
. T
HIS PLUG MAY
,
AND
AILURE TO DO SO MAY RESULT IN
DIP
#13 MUST
SWITCH
BE SET TO
CTK01
COMMUNICATING
ON
. T
MUST BE SET TO
POSITION
-
2-
COMMUNICATING
STAGE
CTK04**
OR
DIP
SWITCH
). T
HIS IS ALSO THE CORRECT
-
STAGE
.
AUX
Figure 30
HIS IS
#13
IS
29
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