Installation - Aprilaire 8120 Safety & Installation Instructions

INSTALLATION

STEP 1: REMOVE ITEMS FROM BOX
See Figure 1.
A. MODEL 8120 VENT CONTROL
B. OUTDOOR TEMPERATURE SENSOR
C. TIME ONLY RESISTOR INSERT
STEP 2: DETERMINE VENT CONTROL LOCATION AND INSTALL
A. The Control must be installed in the return duct, at least 6 inches upstream of the fresh air intake opening, the humidifi er if present, and/or
the humidifi er bypass duct opening. See Figure 2.
B. For systems using fl exible duct for return chases a mixing box might be necessary to locate the control. The mixing box can make it diffi cult
to get the Control away from the fresh air duct port. Get it as close to the main return as possible, or located remotely from the fresh air
opening.
C. Then use the template (page 4) to cut the opening and mount the Control.
STEP 3: INSTALL INLET VENT, DUCTING (FLEX OR RIGID) AND DAMPER (INCLUDED WITH MODEL 8126)
A. All duct work must be insulated. The damper
assembly is heavy and requires support. Install the
damper with the crimped end downstream. Insulate
the damper assembly but leave the motor cover
exposed to open air for adjustment access (see
Damper Instruction sheet and Figure 2).
B. If working with sharp metal edges wear gloves. For
metal or fl exible duct, seal joints with UL181 foil tape.
C. Keep the inlet away from dryer or furnace vents,
driveways, trash containers and swimming pools.
Also the inlet vent should be above expected snow
accumulation. Local codes might apply.
D. The inlet vent should be a metal open hood model,
plastic louvers will greatly cut airfl ow. Make sure the
inlet hood has a screen. See Figure 3.
FIGURE 3 – Recommended Inlet Vent
FIGURE 1 – Carton Contents
FIGURE 2 – Typical Installations
Gable End Wall,
Band Joist, or Porch Soffit
Fresh Air
Intake Hood
w/screen
Fresh Air
Intake Hood
w/screen
Outside
Wall
2
B
A
C
TYPICAL ATTIC INSTALLATION
Motorized
Return Mixing Box
Damper
Fresh Air
Intake Duct
Air Flow
(Return)
Return Duct
Ventilation
Controller
Fresh Air
Intake Duct
Motorized
Damper
Filter
Furnace/Air Handler
TYPICAL BASEMENT INSTALLATION
90-697
Furnace/Air Handler
Filter
Supply
Plenum
Ventilation Controller
Supply
Duct
Humidifier
Air
Flow
90-948