Goodman Mfg VC8 User Manual

30

Four wires are required between the indoor unit and thermo-
stat.

NOTE: Use of the CTK01AA 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

2 R C

1

2 R C

CTK01AA

Thermostat

CT Compatible

Furnace Integrated

Control Module

CT Compatible

AC/HP Integrated

Control Module

40VA Transformer (included in

            CTK01AA kit)

208/230 VAC

24 VAC

1

2 R C

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 4-
position thermostat connectors in the CTK01AA kit.  Remove the
red keying tabs from the on-board connector block and position
both 4-position connectors such that “1”, “2”, “R”, “C”, and “Y1”
positions are filled.

1

2 R C

C

Y

CT Compatible

Furnace Integrated

Control Module

CTK01AA

Thermostat

Non-CT Compatible

Single Stage AC

G

W1 W2 Y1

Y2

O

1

2

R

C

4-Position Connectors 

from CTK01AA 

Thermostat Kit

The ComfortNet system permits access to additional system
information, advanced setup features, and advanced diagnos-
tic/troubleshooting features.  These advanced features are or-
ganized into a menu structure.  The menus are accessed and
navigated as described in the following section.

This furnace can be used in conjunction with a ComfortNet™ com-
patible heat pump in a fossil fuel application.  A fossil fuel applica-
tion 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).  When
used with the CTK01AA thermostat, the furnace/heat pump
system is automically configured as a fossil fuel system.  The
balance point temperature may be adjusted via the CTK01AA
thermostat advanced user menus (see CTK01AA instructions
for additional information).

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.  It
is  strongly recommended that multiple wires into a single
terminal 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.

Typical ComfortNet™ wiring will consist of four wires between
the indoor unit and outdoor unit and between the indoor unit
and thermostat.  The required wires are: (a) data lines, 1 and 2;
(b) thermostat “R” (24 VAC hot) and “C” (24 VAC common).

1

2 R C

1 2 R C

CTK01AA
Thermostat

CT Compatible Furnace

Integrated Control Module

CT Compatible AC/HP

Integrated Control Module

1

2 R C

Two wires can be utilized between the indoor and outdoor units.
For this wiring scheme, only the data lines, 1 and 2, are needed
required 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 elec-
tronic control.  The transformer is included with the CTK01AA
kit.  See kit instructions for mounting and wiring instructions.