28
All field wiring must conform to applicable codes. Connections
should be made as shown in the following figure.
AUX OUT
AUX IN
L1
NEUTRAL
Accessories Wiring
If it is necessary for the installer to supply additional line volt-
age wiring to the inside of the furnace, the wiring must con-
form to all local codes, and have a minimum temperature rating
of 105°C. All line voltage wire splices must be made inside the
furnace junction box.
The integrated furnace control HUM (dry contacts) are closed
whenever the inducer is energized in a non-communicating
installation. When used with a CTK02**, CTK03 or CTK04
communicating thermostat, the HUM terminals are closed
whenever there is a call for humidity. The integrated control
module electronic air cleaner terminals (EAC) are energized with
115 volts whenever the circulator blower is energized.
24 V
OLT
H
UMIDIFIER
A 24 volt humidifier can be powered by feeding one of the
HUM terminals with a field installed wire from the R termi-
nal or by connecting to the NO side of the low fire pressure
switch.
Gas Supply and Piping
The furnace rating plate includes the approved furnace gas in-
put rating and gas types. The furnace must be equipped to
operate on the type of gas applied. This includes any conver-
sion kits required for alternate fuels and/or high altitude.
CAUTION
T
O
PREVENT
UNRELIABLE
OPERATION
OR
EQUIPMENT
DAMAGE
,
THE
INLET
GAS
SUPPLY
PRESSURE
MUST
BE
AS
SPECIFIED
ON
THE
UNIT
RATING
PLATE
WITH
ALL
OTHER
HOUSEHOLD
GAS
FIRED
APPLIANCES
OPERATING
.
Inlet gas supply pressures must be maintained within the ranges
specified in the following table. The supply pressure must be
constant and available with all other household gas fired appli-
ances operating. The minimum gas supply pressure must be
maintained to prevent unreliable ignition. The maximum must
not be exceeded to prevent unit overfiring.
Natural Gas
Minimum: 4.5" w.c.
Maximum: 10.0" w.c.
Propane Gas
Minimum: 11.0" w.c.
Maximum: 13.0" w.c.
Inlet Gas Supply Pressure
P
ROPANE
G
AS
C
ONVERSION
WARNING
P
OSSIBLE
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
MAY
OCCUR
IF
THE
CORRECT
CONVERSION
KITS
ARE
NOT
INSTALLED
. T
HE
APPROPRIATE
KITS
MUST
BE
APPLIED
TO
ENSURE
SAFE
AND
PROPER
FURNACE
OPERATION
. A
LL
CONVERSIONS
MUST
BE
PERFORMED
BY
A
QUALIFIED
INSTALLER
OR
SERVICE
AGENCY
.
G
AS
P
IPING
C
ONNECTIONS
T
O
AVOID
POSSIBLE
UNSATISFACTORY
OPERATION
OF
EQUIPMENT
DAMAGE
DUE
TO
UNDERFIRING
OR
EQUIPMENT
,
USE
THE
PROPER
SIZE
OF
NATURAL
/
PROPANE
GAS
PIPING
NEEDED
WHEN
RUNNING
PIPE
FROM
THE
METER
/
TANK
TO
THE
FURNACE
.
WARNING
When sizing gas lines, be sure to include all appliances which
will operate simultaneously when sizing a trunk line.
The gas piping supplying the furnace must be properly sized
based on the gas flow required, specific gravity of the gas, and
length of the run. The gas line installation must comply with
local codes, or in their absence, with the latest edition of the
National Fuel Gas Code, NFPA 54/ANSI Z223.1.
OPERATION
