Goodman *MVM96 Installation Instructions Manual page 44

F F A
OSSIL UEL PPLICATIONS
This furnace can be used in conjunction with a ComfortNet™
compatible heat pump in a fossil fuel application. A fossil fuel
application refers to a combined gas furnace and heat pump in-
stallation which uses an outdoor temperature sensor to determine
the most cost efficient means of heating (heat pump or gas fur-
nace). When used with the CTK0* thermostat, the furnace/
heat pump system is automatically configured as a fossil fuel
system. The balance point temperature may be adjusted via
the CTK0* thermostat advanced user menus (see CTK0* in-
structions for additional 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 system
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
T -W O , F
WO IRE UTDOOR OUR
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 communicating
thermostat kits. See kit instructions for mounting and wiring in-
structions. 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 acces-
sory transformer kit TFK01 should be used.
W
UTDOOR IRING
ComfortNet Compatible AC/HP
Integrated Control Module
-W I W
IRE NDOOR IRING
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.
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 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.
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
C N ™ S
OMFORT ET YSTEM
The ComfortNet system permits access to additional system in-
formation, advanced setup features, and advanced diagnostic/
troubleshooting features. These advanced features are organized
into a menu structure. The menus are accessed and navigated as
described in the instructions provided with the communicating
control.
44
CTK0*
Thermostat
1 2 R C
ComfortNet Compatible
1 2 R C
Furnace Integrated
Control Module
ComfortNet Compatible
R C
1 2
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
A F
DVANCED EATURES
N
ET