Service Manual

PRODUCT DESIGN
32
Options for control:
With the CTK02 thermostat. From the Main Menu > Clock
& Display > Hum Display > (On). Enter the Advanced menu
by pressing left and right arrows for three seconds > Com
Devices > Furnace > Setup > Humidity > (On or Indepen-
dent) If “On” is selected, the HUM IN – HUM OUT contacts
will close during a call for heat if the room humidty is below
the humidity set point selected on the CTK02**. The control
board also runs the furnace blower on constant fan speed to
support the call for humidification. If “IND” is selected, the
HUM IN – HUM OUT contacts will close with or without a
call for heat if the room humidity is below the humidity setpoint
selected on the CTK02**. The control board also runs the
furnace blower on constant fan speed to support the call for
humidification.
With the CTK03AB thermostat. From the Main Menu > In-
staller Options (enter 4 digit passcode from the Dealer Infor-
mation Menu) > View / Edit Current Setup > Humidification
> Humidifier Type (Steam or Bypass / fan powered) > Modes
Allowing Humidification (Heat, Off) > Humidification Control
> (Humidify only when fan is on, Humidify on demand –
thermostat controls fan, Humidify on demand – equipment
controls fan)
24 VOLT THERMOSTAT WIRING
NOTE: Low voltage connections can be made through ei-
ther the right or left side panel. Wire routing must not inter-
fere with circulator blower operation, filter removal, or routine
maintenance.
A 40 V.A. transformer and an integrated electronic control
are built into the furnace to allow use with most cooling equip-
ment. Consult the wiring diagram, located in the Technical
Manual or on the blower door for further details of 115 Volt
and 24 Volt wiring.
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 only” system and “heat/cool
system”.
As a two-stage non-communicating furnace, the furnace in-
tegrated control module provides terminals for both “W1” and
“W2”, and “Y1” and “Y2” thermostat connections. This al-
lows the furnace to support the following system applica-
tions: ‘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 con-
nections 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 facili-
tate use with most cooling equipment. Consult the wiring
diagram, located on the blower compartment door, for fur-
ther details of 115 Volt and 24 Volt wiring.
NOTE: For single stage cooling applications, a jumper may
be required between Y1 and Y2 at the furnace control in
order to achieve the desired single stage cooling airflow.
Consult the blower performance tables to determine if the
required single stage cooling airflow can be delivered at low
stage (Y1 input) or high stage (Y2 input). Additionally, use
of ramping profile features require a jumper between Y1 and
O when used with a straight cooling unit.
NOTE: Thermostat “R” required if outdoor unit is equipped
with a Comfort Alert™ module or if the out door unit is a part
of the ComfortNet family of equipment AND is wired as a
legacy system.
Y
R
R
Y C
NEU
Furnace Integrated
Control Module
Remote
Condensing Unit
(Single-Stage Cooling)
Dehumidistat
[Optional]
To apply a single-stage Heating Thermostat,
the thermostat selector switch on the
Integrated Control Module be set on
single-stage.
must
NOTE:
Single Stage Heating with Single Stage Cooling
Thermostat
Single Stage Heating with
Single Stage Cooling
Place Jumper Between Y1
and O For Proper
Dehumidification Operation
and Proper Ramping
Profile Operation
Y
Two-Stage Heating with Single-Stage Cooling
R
R
Y C
Furnace Integrated
Control Module
Thermostat
Two-Stage Heating
with
Single-Stage Cooling
Remote
Condensing Unit
(Single-Stage Cooling)
Dehumidistat
[Optional]
NEU
Place Jumper Between Y1
and O For Proper
Dehumidification Operation
and Proper Ramping
Profile Operation
Two-Stage Heating with Two-Stage Cooling
W1 W2
Y2
Furnace Integrated
Control Module
Thermostat
Two-Stage Heating
with
Two-Stage Cooling
()
Remote
Condensing Unit
(Two-Stage Cooling)
Dehumidistat
[Optional]
Y2
Y2
W2
W1
NEU
Place Jumper Between Y1
and O For Proper
Dehumidification Operation
and Proper Ramping
Profile Operation
Thermostat Wiring Diagrams