Installations Instructions

47
TWO-WIRE OUTDOOR, FOUR-WIRE INDOOR WIRING
As few as 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 out-
door unit to provide 24VAC power to the outdoor unit’s electronic
control. The transformer is included in selected communicat-
ing thermostat kits. See kit instructions for mounting and wir-
ing instructions. Four wires are required between the indoor
unit and thermostat. If using a communicating thermostat
kit that does not include a transformer in a dual fuel system,
the accessory transformer kit TFK01 should be used.
NOTE: Use of the accessory 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.
COMFORTNET™ COMPATIBLE FURNACE WITH NON-COMFORTNET
COMPATIBLE SINGLE-STAGE AIR CONDITIONER
Four wires are required between the furnace and thermostat.
Two wires are required between the furnace control and single
stage air conditioner. For this system configuration, the “Y1”
terminal on the integrated furnace control becomes an output
rather than an input. The “Y1” connection to the outdoor unit is
made using both of the 4-position thermostat connectors in the
CTK0* kit. Remove the red keying tabs from the on-board con-
nector block and position both 4-position connector such that
“1”, “2”, “R”, “C”, and “Y1” positions are filled.
COMFORTNET™ SYSTEM ADVANCED FEATURES
The ComfortNet system permits access to additional system in-
formation, advanced setup features, and advanced diagnostic/
troubleshooting features. These advanced features are orga-
nized into a menu structure. The menus are accessed and navi-
gated as described in the instructions provided with the com-
municating control.
A 24 VAC input may be applied to the G terminal of the modu-
lating furnace control board to operate the indoor blower to
support and HRV/ERV. The 24 VAC source must originate from
the R terminal of furnace.
W 1 W 2 Y1 Y2 O DEHUM
24 vac "G" input t o Furnace
Integrat ed Control module From
ERV / HRV or Similar Devices
1
1
2RC
2
Furnace Integrated
Control Module
RC
G
CTK0* Thermostat
4-Pin (X2), 7 Pin, or 9 Pin Connector
Diagram 1