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INSTALL DAMPERS
Install a damper with an AMT actuator in the duct supplying air
to the sleeping area and wire the terminals to the
corresponding terminals on the T21. Install a second damper
with an AMT actuator in the duct supplying air to the living area
and wire it to the T21. Each damper uses 2.4VA of power.
Ensure that damper installation does not cause obstruction
!
to the damper blade.
When two or more dampers are required to define the sleeping
or living area, the damper may be wired in parallel. LEDs on
the damper actuator indicate when the damper is fully open
(green) or fully closed (red). When properly installed, the
dampers will never fully close.
DAMPER WIRING
!
Warning!
Turn the power to the HVAC equipment off before wiring.
Use 3-conductor, 18 or 20 gage, thermostat cable to wire from
the T21 Thermostat to the sleeping and living area dampers.
There are separate terminals for the sleeping and living area
dampers.
Ensure the damper for the sleeping area is wired to the
terminals labeled SLEEPING and the damper for the living
area is wired to the terminals labeled LIVING.
T21
Wire Color
Terminal
COM
White
CLS
Red
OPN
Green
Multiple dampers can be used to construct the sleeping or living
zones. Daisy chain terminals– COM to COM, OPN to OPN and
CLS to CLS.
INSTALLER SECTION
Green LED
Red LED
Damper
Function
Terminal
COM
Common
CLS
Closes Damper
OPN
Opens Damper
WIRING
!
Warning!
Turn the power to the HVAC equipment off before wiring.
Gas/Electric, 2H/1C
Use 6-conductor, 18 or 20 gage, thermostat cable.
T21
Wire Color
Terminal
R
C
W/OB
Y1
G
W2E/Y2
Gas/Electric, 1H/2C
Use 6-conductor, 18 or 20 gage, thermostat cable.
T21
Wire Color
Terminal
R
C
W/OB
Y1
G
W2E/Y2
Heat Pump, 1 Compressor
Use 6-conductor, 18 or 20 gage, thermostat cable.
T21
Wire Color
Terminal
R
C
WOB
Y1
G
W2E/Y2
Heat Pump, 2-Compressor
Use 6-conductor, 18 or 20 gage, thermostat cable.
T21
Wire Color
Terminal
R
C
WOB
Y1
G
W2E/Y2
page 8 of 16
Equipment
Terminal
Red
R, Rc, Rh
Blue
C
White
W, W1
Yellow
Y, Y1
Green
G
Brown
W2
Equipment
Function
Terminal
Red
R, Rc, Rh
24VAC Power
Blue
C
Common
White
W, W1
Stg1 Heating
Yellow
Y, Y1
Stg1 Cooling
Green
G
Fan
Brown
Y2
Stg2 Cooling
Equipment
Function
Terminal
Red
R, Rc, Rh
24VAC Power
Blue
C
Common
White
O or B
Rev Valve
Yellow
Y, Y1
Compressor
Green
G
Fan
Brown
W, W2 or E
Aux Heat
Equipment
Function
Terminal
Red
R, Rc, Rh
24VAC Power
Blue
C
Common
White
O or B
Rev Valve
Yellow
Y, Y1
Stg1 Compressor
Green
G
Fan
Brown
Y2
Stg2 Compressor
P/N 780101703 3/18 Rev A
Function
24VAC Power
Common
Stg1 Heating
Cooling
Fan
Stg2 Heating
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