Goodman GMVS960805CU AA - Page 14

SYSTEM OPERATION
14
NOTE: Airow will not go above the system Max CFM. If the
tonnage value selected generates an airow value above the
Max CFM, the system will cap this value and not provide any
more airow than the Max CFM.
R
C
G
W
Y
Dehum
Optional
Optional
INDOOR
BOARD TERMINAL
CONNECTIONS
R
C
G
W
Y
Dehum
24 VAC
Thermostat
1
2
R
C
Heat Pump
Optional
R
C
W
Y
This is the only
case where setting the
thermostat to heat pump
mode is acceptable.
Figure 39


R
C
G
W
Y
Dehum
Optional
Optional
Optional if
feature
supported by
thermostat
INDOOR
BOARD TERMINAL
CONNECTIONS
1
2
R
C
R
C
G
W
Y
Dehum
C
Y
Remote
Condensing Unit
(Single-Stage Cooling)
24 VAC
Thermostat
Figure 40


The control board is equipped with a 24 volt dehum input in
the thermostat wiring connector to be used with a thermostat
or dehumidistat. Dehumidification mode allows the air
handler’s circulator blower to operate at a slightly lower speed
(85% of calculated speed) during a combined thermostat
call for cooling and thermostat call for dehumidication or
dehumidistat call for dehumidication. This lower blower
speed enhances dehumidication of the conditioned air
as it passes through the AC coil. If using the dehum input
with a thermostat, congure the thermostat to energize this
terminal when dehumidication is desired. If using an external
dehumidistat, connect it between the R and Dehum terminals.
The dehumidistat must operate on 24 VAC and utilize a switch
which closes on humidity rise. Refer to the low voltage wiring
diagrams for additional wiring details.
Dehumidistat (close on humidity rise)
R
C
G
Y
Dehum
Dehumidistat
(close on humidity rise)
Figure 41

This furnace can be used in conjunction with a heat pump in a
fossil fuel application. A fossil fuel application refers to a combined
gas furnace and heat pump installation which uses an outdoor
temperature sensor to determine when to run the heat pump
or gas furnace.
For non-communicating single stage heat pump installations a
fossil fuel kit can be used. Follow the wiring guidelines in the
fossil fuel kit installation instructions. All furnace connections
must be made to the furnace integrated control module and
the “FURNACE” terminal strip on the fossil fuel control board.
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