40
115 V
OLT
L
INE
C
ONNECTION
OF
A
CCESSORIES
(H
UMIDIFIER
AND
E
LECTRONIC
A
IR
C
LEANER
)
HIGH VOLTAGE !
T
O
AVOID
PERSONAL
INJURY
OR
DEATH
DUE
TO
ELECTRICAL
SHOCK
,
DISCONNECT
ELECTRICAL
POWER
BEFORE
SERVICING
OR
CHANGING
ANY
ELECTRICAL
WIRING
.
WARNING
The furnace integrated control module is equipped with line volt-
age accessory terminals for controlling power to an electronic air
cleaner.
The accessory load specifications are as follows. (The furnace
control board also has a set of dry contacts for humidifier
connection.)
Humidifier
1.0 Amp maximum at 120 VAC
Electronic Air Cleaner
1.0 Amp maximum at 120 VAC
Turn OFF power to the furnace before installing any accessories.
Follow the humidifier or air cleaner manufacturers’ instructions for
locating, mounting, grounding, and controlling these accesso-
ries. Accessory wiring connections are to be made through the
1/4" quick connect terminals provided on the furnace integrated
control module. The Electronic air cleaner hot terminal is iden-
tified as EAC.
It is necessary to remove the protective tab on
the board cover to access the EAC Terminal.
The EAC neu-
tral terminal is identified as NEUTRAL. A line voltage hu-
midifier may be connected between one of the HUM con-
tacts and NEUTRAL. The other HUM contact must be fed
from the L1 terminal.
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 voltage
wiring to the inside of the furnace, the wiring must conform 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** communicating ther-
mostat, 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 terminal
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 input
rating and gas types. The furnace must be equipped to operate
on the type of gas applied. This includes any conversion 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
H
IGH
A
LTITUDE
The modulating furnace is approved up to 10,000 ft altitude.
Do
not
derate the furnace by adjusting the manifold pressure to
a lower pressure.
In some areas the gas supplier may artificially derate the gas in
an effort to compensate for the effects of altitude. If the gas is
artificially derated, the appropriate orifice size must be determined
based upon the BTU/ft
3
content of the derated gas and the alti-
tude. Refer to the National Fuel Gas Code, NFPA 54/ANSI Z223.1,
and information provided by the gas supplier to determine the
proper orifice size.
.
OPERATION
