Ductwork & Damper Installation; Wiring - Aprilaire 8120 Safety & Installation Instructions

DUCTWORK & DAMPER INSTAllATION
DAMPER INSTAllATION
Step 1: Install damper with crimped end downstream .
Step 2: Slide damper over end of crimped duct and
secure to duct with 1/2 inch long sheet metal
screws (not included) .
Step 3: Insulate the damper assembly . Leave the
motor cover exposed for wiring .
NOTE: Support all duct work in accordance with local
code or SMACnA standards .
NOTE: The damper blade, as supplied, is fully closed
when not powered and will fully open when
powered . The stop screw can be used to
limit how much the damper opens when
powered . The damper is 10 VA at 24 VAC
power-opened/spring-closed .
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fIGURE 4 – Aprilaire Damper
BRACkET
MOTOR
InDICATOR LABEL
ADjUSTABLE
STOp SCREW
(shown with plastic cover removed)
fIGURE 5 – Damper Installation
FRESH AIR InTAkE
ROUnD
DAMpER
AIR FLOW
DIRECTIOn
DO nOT InSULATE
ACTUATOR

WIRING

Disconnect power to HVAC equipment. Make wire connections as shown in figure 6 .
• Wire the 24VAC transformer (provided with Model 8126A only). The transformer should be continuously energized,
do not wire to the HVAC blower circuit . The transformer, damper and the ventilation controller "VEnT" terminals
will be wired in series .
• Wire R, C, and W terminals
on the ventilation controller
to the corresponding
terminals on the HVAC control
board . Leaving any existing R,
C, and W leads in place .
• Disconnect the thermostat
wire from the HVAC terminal
90-935
G and connect it to the
ventilation controller G
terminal .
• Wire Gf on the ventilation
controller to the HVAC
terminal G . The only wire
connected to HVAC G will be
from the ventilation controller
Gf terminal .
fIGURE 6 – Wiring to Controller
8120A DIGITAL VENTILATION CONTROLLER TERMINAL STRIP
POWER INPUTS
NOT
R C USED ODT W
R
R
C
C
G
G
Y
Y
W
W
THERMOSTAT FURNACE
OUTPUTS
G VENT Gf
DAMPER
120 VAC
CONTINUOUSLY POWERED
24 VAC TRANSFORMER
90-1829
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