31
Once the switch is set, the dehumidify function is enabled during
a
combination
call for cooling (T-Stat) and dehumidification
(DEHUM-Stat). Refer to the DIP switch chart in the back sec-
tion of this manual.
F
OSSIL
F
UEL
A
PPLICATIONS
This furnace can be used in conjunction with a heat pump in a
fossil fuel application. A fossil fuel application refers to a
combined gas furnace and heat pump installation which uses
an outdoor temperature sensor to determine the most cost
efficient means of heating (heat pump or gas furnace).
Strictly follow the wiring guidelines in the fossil fuel kit in-
stallation instructions. All furnace connections must be made
to the furnace control board and the “FURNACE” terminal strip
on the fossil fuel control board.
L
INE
V
OLTAGE
A
CCESSORIES
(E
LECTRONIC
A
IR
C
LEANER
AND
H
UMIDIFIER
)
The furnace control board is equipped with line voltage ac-
cessory terminals for controlling power to an electronic air
cleaner.
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 accessory load specifications are as follows. (The fur-
nace control board also has a set of dry contacts for hu-
midifier 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 accesso-
ries. Follow the humidifier or air cleaner manufacturers’ in-
structions for locating, mounting, grounding, and controlling
these accessories. 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 identified as EAC.
It is necessary
to remove the protective tab on the board cover to access
the EAC Terminal.
The EAC neutral terminal is identified
as NEUTRAL. A line voltage humidifier may be connected
between one of the HUM contacts 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 Figure 35.
AUX OUT
AUX IN
L1
NEUTRAL
Accessories Wiring
Figure 35
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 furnace control board HUM (dry contacts) are closed when-
ever the inducer is energized in a non-communicating in-
stallation. When used with a CTK02**, CTK03 or CTK04 com-
municating thermostat, the HUM terminals are closed when-
ever there is a call for humidity when this feature is enabled
in the communicating thermostat. In the CTK03AB & CTK04**
humidity must be enabled in he main menu, se up in the
Installer menu & ComfortNet user menu. The integrated con-
trol 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 ter-
minal.
G
AS
S
UPPLY
AND
P
IPING
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 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.
