Fossil Fuel Applications; Ctk0* Wiring - Goodman VC8 Installation Instructions Manual

In continuous fan mode, the CTK0* thermostat provides the
airflow demand. The thermostat may be configured for a low,
medium, or high continuous fan speed. The low, medium, and
high fan speeds correspond to 25%, 50%, and 75%, respec-
tively, of the furnaces' maximum airflow capability. During con-
tinuous fan operation, the thermostat sends a fan request along
with the continuous fan demand to the furnace. The furnace,
in turn, sends the demand to the ECM motor. The ECM motor
delivers the requested continuous fan airflow.
F F A
OSSIL UEL PPLICATIONS
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 CTK0* thermostat, the furnace/heat pump sys-
tem is automically configured as a fossil fuel system. The
balance point temperature may be adjusted via the CTK0* ther-
mostat advanced user menus (see CTK0* instructions for addi-
tional information).
CTK0* W
IRING
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.
F -W I O
OUR IRE NDOOR AND
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).
CTK0*
Thermostat
1 2 R C
ComfortNet Compatible Furnace
1 2 R C
Integrated Control Module
1 2 R C
System Wiring using Four-Wires
W
UTDOOR IRING
ComfortNet Compatible AC/HP
Integrated Control Module
T -W O , F
WO IRE UTDOOR
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 CTK0* kit.
See kit instructions for mounting and wiring instructions. Four
wires are required between the indoor unit and thermostat. If
using a CTK02** in a dual fuel system, the accessory trans-
former kit TFK01 should be used.
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.
40VA Transformer
(included in CTK01 kit)
208/230 VAC 24 VAC
System Wiring using Two-Wires between Furnace and AC/HP
and Four-Wires between Furnace and Thermostat
C N C
OMFORT ET OMPATIBLE
S -S
COMPATIBLE INGLE TAGE
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 CTK0* 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.
CTK0*
Thermostat
1 2 R C
1 2 R C G W1 W2 Y1
C
System Wiring between Furnace and Non-Communicating
Compatible Single Stage Air Conditioner
30
-W I W
OUR IRE NDOOR IRING
CTK0*
Thermostat
1 2 R C
ComfortNet Compatible
1 2 R C
Furnace Integrated
Control Module
ComfortNet Compatible
1 2 R C
AC/HP Integrated
Control Module
F N -C
URNACE WITH ON OMFORT
A C
IR ONDITIONER
4-Position Connectors
from CTK0*
Thermostat Kit
ComfortNet Compatible
O
Y2
Furnace Integrated
Control Module
Non- ComfortNet Compatible
Y
Single Stage AC
N
ET