Aprilaire 8120 Einrichtungshandbuch

Model 8120A & 8126A

Digital Ventilation Controller

READ AND SAVE THESE INSTRUCTIONS

Safety &

Installation

Instructions

2 3

Safety Instructions................................................................................3

Specifications....................................................................................4

Overview .......................................................................................4

Mounting Location................................................................................5

Mounting Controller...............................................................................7

Ductwork & Damper Installation.....................................................................9

Wiring.........................................................................................11

Mode Selection .................................................................................13

Determine Ventilation Requirements ................................................................15

Setting Ventilation Time ..........................................................................17

System Checkout ................................................................................18

Troubleshooting .................................................................................19

TABLE OF CONTENTS SAFETY INSTRUCTIONS

DANGER

ATTENTION INSTALLER:

To prevent serious injury from electrical shock this product must be

installed by a qualified HVAC contractor.

120 volts can cause serious injury from electric shock.

Disconnect electrical power to the HVAC system before proceeding.

CAUTION

Do not mount the Ventilation Controller on the supply plenum or

duct. The unit can lose its calibration when exposed to elevated

temperatures.

When installing the Ventilation Controller on downflow furnaces,

ensure that the blower continues to run after the heat call is satisfied

to prevent high temperatures from damaging the Control circuit board.

Do not mount the Ventilation Controller downstream from any fresh air

intake port, humidifier or bypass outlet. False humidity conditions will

cause the Ventilation Controller to operate incorrectly.

WARNING

Sharp metal edges can

cause serious injury from

cuts. Use gloves when

cutting plenum openings

and handling ductwork.

4 5

SPECIFICATIONS OVERVIEW

Operating temperature range 20-160°F

Maximum current through VENT relay 2A

Input voltage 22-30 VAC

Minimum VA required 2.0 VA

The ventilation controller will bring in fresh air

and activate the HVAC fan to cycle the fresh air

throughout the home. The controller is designed to

meet the ASHRAE 62.2-2010 standard for ventilation.

The ventilation mode selection allows for time only

operation or for temperature and humidity limits to be

applied to the incoming air.

MOUNTING LOCATION

The controller must be installed in the return duct, at least 6 inches upstream of the fresh air intake opening, the

humidifier if present, and/or the humidifier bypass duct opening (see Figures 1 & 2).

VENTILATION CONTROLLER

AIR FLOW

(RETURN)

FILTER FURNACE/AIR HANDLER

FRESH AIR

INTAKE HOOD

W/SCREEN

FRESH AIR

INTAKE DUCT

MOTORIZED

DAMPER

FRESH AIR

GABLE END WALL,

BAND JOIST, OR PORCH SOFFIT

SUPPLY

PLENUM

6”

90-948

FIGURE 1 – Typical Attic Installation

6 7

MOUNTING LOCATION

OUTSIDE

WALL

FRESH AIR

INTAKE DUCT

MOTORIZED

DAMPER

VENTILATION

CONTROLLER

AIR

FLOW

FURNACE/AIR HANDLER

FILTER

FRESH AIR

INTAKE HOOD

W/SCREEN

RETURN DUCT SUPPLY

DUCT

HUMIDIFIER

6”

90-948

FIGURE 2 – Typical Basement Installation

MOUNTING CONTROLLER

DISASSEMBLE THE CONTROLLER MOUNT CONTROLLER TO DUCT

Remove the knob. Remove the cover by pulling at the

bottom and swinging out and up.

After the location of the controller is selected, drill a

3/4 inch hole for the RH sensor (the RH sensor extends

from the back of the controller).

Before removing the adhesive backing, use the

controller to mark the mounting holes and place

anchors if applicable.

Clean the mounting surface of the duct, remove the

adhesive backing from the gasket on the controller, and

secure the controller to the duct making sure to align

mounting holes and the RH sensor with the drilled hole.

Mounting to Metal Duct

Use field supplied sheet metal screws to secure

controller to duct.

Mounting to Duct Board

Use field supplied screws and anchors to secure

controller to duct.

Make sure the controller sensor gasket is sealed

tightly around the drilled hole. Do not install the

controller without the gasket.

8 9

3/4" DIA HOLE

MOUNTING CONTROLLER

90-1830

FIGURE 3 – Fiber and Sheet Metal Duct Mount

Note: Controller Replacement – When replacing an 8120 with an 8120A, the duct opening left by the removed

controller must be covered completely. Locate and install the new controller as instructed above.

DUCTWORK & DAMPER INSTALLATION

CAUTION

1. Sharp edges may cause

serious injury from cuts. Use

care when cutting openings

and handling duct work.

2. Install damper in fresh air duct

as close to the return duct as

possible.

3. Do not force damper blades by

hand, as damage may occur.

DUCTWORK SPECIFICATIONS

• Insulated duct of at least R-4 insulating value with a continuous

vapor barrier must be used for the intake duct. The vapor barrier must

be seated at both ends.

• All flexible ducts must meet UL safety standards for Class I air ducts

and connectors.

• All ducting must be installed according to HVAC codes and standards.

• For optimum performance, keep duct run as short and straight as

possible.

• All duct connections should be sealed with UL181 foil tape or mastic

to prevent leakage.

• Exterior intake hood must be weather resistant.

• Exterior intake hood must have a screen (1/4" openings) to prevent

unwanted debris, animals, and insects from entering ductwork. A

metal open hood model is recommended. An intake vent with plastic

louvers significantly reduces airflow.

• Exterior intake hood should be above the expected snow line or a

minimum of 18" above ground level, whichever is greater.

• Exterior intake hood should be a minimum of 10 ft. from appliance

vents or other sources of pollution and/or extreme temperatures,

such as furnace exhaust or car exhaust, etc.

10 11

INDICATOR LABEL

BRACKET

MOTOR

ADJUSTABLE

STOP SCREW

90-935

(shown with plastic cover removed)

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.

ROUND

DAMPER

FRESH AIR INTAKE

AIR FLOW

DIRECTION DO NOT INSULATE

ACTUATOR

FIGURE 4 – Aprilaire Damper

FIGURE 5 – Damper Installation

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

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.

90-1829

FIGURE 6 – Wiring to Controller

CONTINUOUSLY POWERED

24 VAC TRANSFORMER

THERMOSTAT

OUTPUTSINPUTSPOWER

CR VENT

ODTGf

120 VAC

FURNACE

USED

NOT

8120A DIGITAL VENTILATION CONTROLLER TERMINAL STRIP

DAMPER

12 13

WIRING

SELECT MOUNTING LOCATION FOR

OUTDOOR TEMPERATURE SENSOR (ODT)

The temperature sensor can be located in the

fresh air duct, in the vent inlet, or on the outside

of an exterior wall.

• Do not mount in direct sunlight.

• Do not mount closer than three feet to any

exhaust vent.

• Do not route wire alongside 120VAC wires.

• Do not use more than 300 feet of wire to

connect the sensor.

• Do not mount below the expected snow line

on exterior walls.

If selecting a mode with temperature limits

(B, C or D), the outdoor temperature sensor must

be installed. NORTH, EAST

OR WEST SIDE

OF HOME

OUTDOOR

TEMPERATURE

SENSOR

BRACKET

SENSOR

ABOVE EXPECTED

SNOW LINE

OUTDOOR

TEMPERATURE

SENSOR LEADS

FIGURE 7 – ODT Mounted Outside

FIGURE 8 – ODT Mounted in Intake Duct

CENTER LINE

OUTSIDE WALL

36" MAX.

MODE SELECTION

Position Description Chart

(Time Only)

Timer controlled

ventilation (No

temperature or

humidity limits)

This setting can be calculated with ASHRAE 62.2-2010 standards.

(Temperature and humidity sensors are ignored.)

(Default)

Timer controlled

ventilation with

humidity and

temperature limits

VENTILATION

PREVENTED

VENTILATION ALLOWED

VENTILATION ALLOWED WITH HEAT

100°

20°

0°

55%

INDOOR RELATIVE HUMIDITY

OUTDOOR TEMPERATURE (F)

50°

VENTILATION PREVENTED

15% 25% 35% 45

This controller is equipped with 4 mode settings. The “A” mode allows the controller ventilate based on time only.

The “B”, C”, and “D” modes allow the controller to ventilate based upon time, outdoor temp, and indoor humidity.

14 15

MODE SELECTION

Position Description Chart

(Cold Climate)

Timer controlled

ventilation with

humidity and

temperature limits

VENTILATION

PREVENTED

VENTILATION ALLOWED

100°

0°

55%

INDOOR RELATIVE HUMIDITY

OUTDOOR TEMPERATURE (F)

50°

VENTILATION PREVENTED

15% 25% 35% 45

(Warm Climate)

Timer controlled

ventilation with

humidity and

temperature limits

VENTILATION

PREVENTED

VENTILATION ALLOWED

VENTILATION ALLOWED WITH HEAT

0°

55%

INDOOR RELATIVE HUMIDITY

OUTDOOR TEMPERATURE (F)

50°

40°

VENTILATION PREVENTED

15% 25% 35% 45

90°

DETERMINE VENTILATION REQUIREMENTS

CALCULATE VENTILATION TIME REQUIREMENTS AND SELECT VENTILATION TIME SETTING

TABLE 1 – Ventilation Air Requirements, CFM

Home Size (ft2)Number of Bedrooms

<2 2 – 3 4 – 5 6 – 7 >7

1500 30 45 60 75 90

1501 – 3000 45 60 75 90 105

3001 – 4500 60 75 90 105 120

4501 – 6000 75 90 105 120 135

6001 – 7500 90 105 120 135 150

>7500 105 120 135 150 165

1. Determine the minimum ventilation requirement. This is calculated using ASHRAE 62.2-2010.

Airflow in CFM = [House Area in Sq Ft x 0.01] + [No. bedrooms +1 x 7.5] Use the Number of Bedrooms (Plus 1) or the

Number of Occupants, whichever is larger.

Additional ventilation may be required for pets, hobbies, fireplaces and attached garage, etc. If more outdoor air is

required than the Ventilation Controller can deliver, increase delivered CFM by: reducing bends in duct, increasing

duct size, adding a second duct, or adding a powered fan.

Indicate the required CFM __________

16 17

DETERMINE VENTILATION REQUIREMENTS

2. Determine the ventilation controller fresh air delivery rate.

TABLE 2 – CFM Delivered

Duct

Length

Negative Static Pressure (“w.c.) as Measured for Return Duct or Plenum

0.05 0.1 0.15 0.2 0.25 0.3

Flex Pipe Flex Pipe Flex Pipe Flex Pipe Flex Pipe Flex Pipe

10 ft. 60 65 85 90 105 110 120 125 135 140 150 160

20 ft. 55 60 80 85 100 105 115 120 130 135 140 150

30 ft. 50 55 75 80 95 100 110 115 125 130 130 140

Measure the negative static pressure of the return system and consult table above for approximate inlet airflow.

These values are not absolute. An airflow measuring device (Nailor-Hart, etc.) will give the Ventilation Controller’s

airflow exactly.

For the table above, the flex duct is laid loose with 2 wide 90° bends, and the damper is full open. For the rigid pipe

the values are based on two 90° elbows, and the damper is open. For both cases the air intake is through a metal

vent hood with a bird screen. Adjust airflow up or down for variations, including elbows or bends, or if the length of

duct you’re using isn’t listed, etc.

Measure the delivered airflow or determine from above chart and record __________

SETTING VENTILATION TIME

3. Determine the ventilation controller knob setting.

TABLE 3 – Cycle Time Setting (minutes) for Airflow Delivered vs. Airflow Required for 1 Hour Cycle

CFM

Delivered

CFM Required

20 30 40 50 60 70 80 90 100 110 120

60 20 30 40 50 60 70 80 90 100 110 120

80 15 25 30 40 45 55 60 70 75 85 90

100 15 20 25 30 35 40 50 55 60 65 70

120 10 15 20 25 30 35 40 45 50 55 60

140 10 15 15 20 25 30 35 40 45 50 55

160 10 10 15 20 25 25 30 35 40 45 50

Use your entries from Steps 1 and 2 in the table above. From this you can determine the correct knob setting. For

example, if 80 CFM is required, and the Vent delivers 120 CFM set the knob to 40 minutes.

If more outdoor air is required, increase delivered CFM by reducing bends in duct, increasing duct size, adding a

second duct, or adding a powered fan.

18 19

SYSTEM CHECKOUT

1. Turn the time setting knob to the TEST/RESET position. If the installation is correct the HVAC blower will turn on

(independent of heat or cooling operation) and the damper will open for 1 minute unless the knob is turned off of

TEST/RESET. If the system does not operate see the Troubleshooting Guide.

2. Return the time setting knob to the calculated setting. Do not leave in TEST/RESET, the Ventilation

Controller will not operate.

TROUBLESHOOTING

Technical support is available Monday through Friday, 7:00 a.m. to 5:00 p.m. CST, at 800-334-6011. Use the

troubleshooting guide to identify and correct system faults. Contact technical support before replacing the controller

or damper, and for additional troubleshooting.

TABLE 4 – Troubleshooting Guide

Symptom Troubleshooting Procedure

HVAC Blower does not

turn on in Test Mode.

1. Make sure HVAC equipment has power.

2. Check the wiring for R, C, W and G and Gf at both the HVAC equipment and

the Ventilation Controller.

3. Check voltage across the Ventilation Controller R&C and C&Gf terminals.

Voltage should be in the 22 VAC to 30 VAC range.

Damper does not open in

Test Mode.

1. Follow steps 1-3 above.

2. Check wiring diagram to make sure the damper is wired in series with the

circuit board and transformer.

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