Tabla de contenido
Idiomas disponibles
Idiomas disponibles
Heat Pump Systems
Typical Wiring Configurations
NOTE: The "Installer Switch" option will be configured in the next step.
1 HEAT / 1 COOL - No Auxiliary Heat
Set Installer Switch to HP
Rh*
24 Volt AC Power
Rc*
Connected to Rh with supplied Jumper Wire
O or B Changeover Valve [note 2]
Y1
Compressor Relay (appears as Y1 on TT-N-421)
G
Fan Relay
C
24 Volt AC Transformer Common [note 1]
2 HEAT / 1 COOL - Including Auxiliary Heat (TT-N-421 only)
Set Installer Switch to HP
R
24 Volt AC Power
O or B Changeover Valve [note 2]
Y1
Compressor Relay (1st stage heating/cooling)
W2
Auxiliary Heat Relay (2nd stage heating) [note 3]
W1/E
Emergency Heat Relay [note 3]
G
Fan Relay
C
24 Volt AC Transformer Common [note 1]
NOTES - Heat Pump Systems
[1] If batteries are installed the 24 Volt AC common connection is optional.
[2] Select O for cool active or B for heat active.
[3] Install a field supplied jumper between the W2 and E terminals if
there is no separate emergency heat relay installed.
Provide disconnect and overload protection as required.
*Appears as R on TT-N-421 (single transformer)
Set Installer Switches
4
Switch
NORM / HP NORM
F / C
HE / HG
NOTE: The reset button should be pressed after making any changes to the
installer switches.
Factory Setting
Default Options Comments
NORM
HP
F
F
C
HG
HG
HE
Select for conventional systems
Select for heat pump systems
Select for fahrenheit temperature scale
Select for celsius temperature scale
Select for gas heat
Select for electric heat
3
Tabla de contenido
