Aprilaire Ventilation Controller 8120 Users Manual 10005994_B AA Vent Control Owners

8120 947addcf-08fa-42cf-9e5f-733f04285bfe Aprilaire Oxygen Equipment 8120 User Guide |

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If the ‘TIME ONLY’ resistor is used in place of the Outdoor Temperature Sensor, the Controller’s
operation is determined by the adjustable timer settings only – the Controller does not limit
the operation based on the temperature and humidity limits shown in Figure 3.

Ventilation Controller

If a jumper wire is used in place of the Outdoor Temperature Sensor, the Controller will
disregard the temperature setting and base the ventilation on the indoor relative humidity
and the user-adjustable timer settings. In this application, the Controller will not ventilate
when the indoor relative humidity rises above 55%.

IV. LIMITED WARRANTY
Your Research Products Corporation Aprilaire® Ventilation Controller is expressly warranted for five (5) years from date of installation
to be free from defects in materials or workmanship.
Research Products Corporation’s exclusive obligation under this warranty shall be to supply, without charge, a replacement for the
Controller which is found to be defective within such five (5) year period and which is returned not later than thirty (30) days after
said five (5) year period by you to either your original supplier or to Research Products Corporation, Madison, Wisconsin 53701,
together with the installation date of the Controller.
THIS WARRANTY SHALL NOT OBLIGATE RESEARCH PRODUCTS CORPORATION FOR ANY LABOR COSTS AND SHALL NOT APPLY TO
DEFECTS IN WORKMANSHIP OR MATERIALS FURNISHED BY YOUR INSTALLER AS CONTRASTED TO DEFECTS IN THE CONTROLLER ITSELF.
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE
AFORESAID FIVE YEAR PERIOD. RESEARCH PRODUCTS CORPORATION’S LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL
DAMAGES, OTHER THAN DAMAGES FOR PERSONAL INJURIES, RESULTING FROM ANY BREACH OF THE AFORESAID IMPLIED
WARRANTIES OR THE ABOVE LIMITED WARRANTY IS EXPRESSLY EXCLUDED. THIS LIMITED WARRANTY IS VOID IF DEFECT(S)
RESULT FROM FAILURE TO HAVE THIS UNIT INSTALLED BY A QUALIFIED HEATING AND AIR CONDITIONING CONTRACTOR. IF THE
LIMITED WARRANTY IS VOID DUE TO FAILURE TO USE A QUALIFIED CONTRACTOR, ALL DISCLAIMERS OF IMPLIED WARRANTIES
SHALL BE EFFECTIVE UPON INSTALLATION.
Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limitation of incidental or
consequential damages so the above exclusion or limitations may not apply to you.
This warranty gives you specific legal rights and you may also have other rights which vary from state to state.

WARRANTY REGISTRATION
Please… Take a few minutes to visit us on-line at

www.aprilaire.com

Model 8120 Ventilation Controller

Owner’s Manual

to register your Aprilaire product.
If you do not have on-line access, please mail a postcard
with your name, address, phone number, product purchased
and date of purchase to:
Research Products Corporation
P.O. BOX 1467
Madison, WI 53701

Thank you!
Your Warranty Registration information will not be sold or shared outside of this company.

Includes Safety & Operating Instructions
and Warranty Information
WARNING

120 volts may cause
injury from electrical shock. Disconnect
power before servicing.

CAUTION

Sudden operation
may cause personal injury or property
damage. Turn Ventilation Controller to
“OFF” before servicing.

10005994 11.06
B2203172B

READ AND SAVE THESE INSTRUCTIONS
1015 E. WASHINGTON AVE. • MADISON, WI 53703 • PHONE: 608/257-8801 • FAX: 608/257-4357 • www.aprilaire.com

• The jumper on the 5 pin header determines the cycle time interval. The interval can be
1, 2, 3 or 4 hours. (The default setting is 1 hour.)

† Test mode is used to check the device at installation. In Test mode
the Ventilation Controller activates the HVAC fan and opens the
damper for one minute or until the knob is taken off the “Test”
setting, whichever occurs first. After the minute has passed, the
Ventilation Controller will not work until the knob is taken off “Test.”

45

60

OFF

0
VENTILATION CONTROLLER

90-702

III. OUTDOOR TEMPERATURE & INDOOR HUMIDITY
CONTROL LIMITS
In a standard installation, your Aprilaire Ventilation Controller will use measurements of
Outdoor Temperature and Indoor Humidity, along with the user-adjustable timer settings, to
determine when to ventilate. Outdoor Temperature is measured with a sensor placed at the
inlet of the fresh air intake duct. Indoor Humidity is measured in the return duct with a sensor
built into the Controller. In conjunction with the timer settings, the Controller then operates
according to the temperature and humidity control limits shown in Figure 3 below.

FIGURE 1 – Cycle Time
FIGURE 3 – Model 8120 Operating Limits
OUTDOOR TEMPERATURE (°F)

CYCLE TIME
1 HR 3 HR
CYCLE TIME
1 HR 3 HR

WIRING AND
JUMPER
CONFIGURATION

2 HR 4 HR

TO HVAC

C

R

D

D

T

T

10005991

A /A

TO HVAC

24VAC

TO STAT

W

DAMPER

GS
GH

TEMP
SENSOR

2 HR 4 HR

TO HVAC

• Remove the knob by
pulling it straight out
from the controller.
Remove the cover by
grabbing along the
top and bottom
edges of the cover
and pulling straight
out from the base.
Refer to Figure 1 to
locate the cycle time
header & jumper.

• The knob settings range from “OFF” which is all
the way counter-clockwise, to “TEST”† which is all
the way clockwise. While labeled in 15 minute
increments, the controller may be adjusted within
the 15 minute interval to the nearest minute.

T

1. SETTING THE CYCLE TIME INTERVAL

FIGURE 2 – Ventilation Time

S

Your Ventilation Controller is installed in the return duct of your furnace or heat pump. There
are two settings that are adjustable: the cycle time and the ventilation time within cycle.
Here’s how this works: if you set the cycle time to 1 hour and the ventilation time knob to
20 minutes, you will get 20 minutes of ventilation every hour. It is important to understand
that the ventilation requirement – 20 minutes per hour in this example – may be satisfied by a
heating, cooling, or fan call initiated by your thermostat, or from a fan call initiated by the
Ventilation Controller itself. The following steps explain how to adjust these settings.

• The knob on the exterior of the controller
is used to set the ventilation time within the
interval you set in Step 1.

E

II. OPERATING INSTRUCTIONS

2. SETTING THE VENTILATION TIME

T

If the outdoor air temperature is below 0°F or above 100°F, the motorized normally-closed
damper to the outside will not be opened. This feature can be disabled at installation if the
installer chooses not to use outdoor air temperature as a parameter.

• Snap the cover back on the controller and slide the knob onto the shaft.

30

Indoor relative humidity is monitored to help prevent high humidity conditions inside your
home. The Aprilaire® Ventilation Controller will not open the damper to the outside air if
there is a chance of raising the humidity inside the house to high levels. The Aprilaire®
Ventilation Controller is designed to prevent indoor relative humidity levels from increasing
beyond 60% due to ventilation.

• Move the jumper to the desired setting. The jumper can be removed by pulling it straight
out from the header pins.

15

With your purchase of the Aprilaire® Ventilation Controller, you have invested in an
intelligent way of providing fresh air to your home. Working in conjunction with an Aprilaire®
Damper, the Ventilation Controller makes decisions regarding when – and how long – to
ventilate. It does this through continuous monitoring of indoor relative humidity, outdoor
temperature, and user-adjusted timer settings.

MINUTES PER CYCLE

I. PRINCIPLE OF OPERATION

100

SECTION A

20

SECTION C
0

SECTION A

INDOOR RELATIVE HUMIDITY (%)

OUTDOOR
TEMPERATURE
SENSOR

90-698

50

SECTION B

55

SECTION A: Controller will not ventilate due to temperature extremes
SECTION B: Controller will ventilate according to timer settings
SECTION C: Controller will ventilate only when heating is on according to the timer settings

90-713



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