56
CTK0* WIRING
NOTE: Refer to Electrical Connections for 115 volt line
connections to the furnace.
NOTE: A removable plug connector is provided with the control
to make thermostat wire connections. This plug may be removed,
wire connections made to the plug, and replaced. Multiple wires
imust be twisted together prior to inserting into the plug connector.
Failure to do so may result in intermittent operation.
Typical 18 AWG thermostat wire may be used to wire the sys-
tem components. One hundred (100) feet is the maximum length
of wire between indoor unit and outdoor unit, or between indoor
unit and thermostat. Wire runs over (100) feet require larger
gauge wire.
FOUR-WIRE INDOOR AND OUTDOOR WIRING
Typical ComfortNet wiring will consist of four wires between the
indoor unit and outdoor unit and between the indoor unit and ther-
mostat. The required wires are: (a) data lines, 1 and 2; (b) ther-
mostat “R” (24 VAC hot) and “C” (24 VAC common).
12RC
12RC
CTK0**
Thermostat
ComfortNet Compatible Furnace
Integrated Control Module
ComfortNet Compatible AC/HP
Integrated Control Module
12RC
System Wiring using Four-Wires
TWO-WIRE OUTDOOR, FOUR-WIRE INDOOR WIRING
Two wires can be utilized between the indoor and outdoor units.
For this wiring scheme, only the data lines, 1 and 2, are needed
between the indoor and outdoor units. A 40VA, 208/230 VAC to
24VAC transformer must be installed in the outdoor unit to pro-
vide 24VAC power to the outdoor unit’s electronic control. The
transformer is included with the CTK01AA kit. See kit instruc-
tions for mounting and wiring instructions. If using a CTK02 or
CTK01BA, an accessory transformer is available (TFK01).
Four wires are required between the indoor unit and thermostat.
NOTE: Use of the CTK0* transformer is recommended if installing
a dual fuel/fossil fuel system. Failure to use the transformer in
the outdoor unit could result in over loading of the furnace
transformer.
1
ST
STAGE COOLING – CONVENTIONAL THERMOSTAT
• A call for cooling is signaled by:
• R powering Y1 and O simultaneously
• R powering Y1, O and G simultaneously
• The compressor and condenser fan are energized di-
rectly from the Y1 terminal from the thermostat.
• The circulator is energized after cool fan on delay.
• If the ‘2 Stage Cooling’ DIP switch is set to:
• ON, then circulator will run at low cooling speed with
Y1 request
• OFF, then circulator will run at high cooling speed with
Y1 request (a Y2 request will be ignored)
• The circulator will operate according to one of the se-
lectable ramping profiles.
• When the cool request is satisfied, the circulator is
de-energized per one of the selectable ramping pro-
files.
2
ND
STAGE COOLING – CONVENTIONAL THERMOSTAT
• The ‘2 Stage Cooling’ DIP switch on the IFC must be
ON to enable 2 stage cooling control with a conven-
tional thermostat.
• A call for 2
nd
stage cooling is signaled by the shorting
of R to Y2 while a valid call for first stage cooling ex-
ists.
• After the cool fan on delay, the circulator is energized
at the low cooling speed when the 1
st
stage cool re-
quest is detected and switches to high cooling speed
immediately after the 2
nd
stage cool request is detected.
• The circulator will be controlled according to the se-
lected ramping profile.
• When the cool requests are satisfied, the circulator is
de-energized per the selected ramping profile.
COOLING OPERATION WITH A C OMMUNICATING THERMOSTAT
AND
CONVENTIONAL SINGLE STAGE A/C
• The call for cooling will be communicated via the
ClimateTalk™ protocol.
• The Y1 terminal of the IFC becomes an output via the
on board Y1 relay
• The IFC does not provide short cycle protection.
• The circulator operates as commanded by the com-
municating thermostat.
COOLING OPERATION WITH A C OMMUNICATING THERMOSTAT
AND
O UTDOOR U NIT
• The furnace receives the CFM demand from the com-
municating outdoor unit.
CALL FOR COOL WITH CALL FOR HEAT PRESENT – DUAL
FUEL DEFROST OPERATION
• While in defrost, the standard light off sequence will be
followed. The IFC will then fire at 100% for the remain-
der of the defrost call.
• While in defrost the circulator will use the selected
heat speed.
OPERATION
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