Aprilaire Model 8140 and 8140NC Fresh Air Ventilator

Introduction and Compliance Statement

The Model 8140 and 8140NC Fresh Air Ventilators are designed to bring in precisely the right amount of outdoor air into today's efficiently designed homes. Duct the inlet of the ventilator to an outdoor air intake and duct the discharge to the HVAC system, then simply plug the unit in, set the amount of needed ventilation and select the desired temperature limits.

Temperature limits are set on the control to avoid bringing in outdoor air during the hottest or coldest period of the day. The built-in control will automatically compensate for the ventilation time that is missed by bringing in additional outdoor air during milder periods of the day. Compliance with the requirements of ASHRAE 62.2-2010 is met as the control adds ventilation time as needed to account for the fractional on-time and effectiveness of the ventilation schedule. The control will also ensure that ventilation occurs no less than one hour of every four. When properly installed and set, the Model 8140 and 8140NC Fresh Air Ventilators will meet the mechanical ventilation requirements of:

• Energy Star Certified Homes, Version 3
• EPA Indoor airPLUS, Version 1
• 2012 & 2015 International Residential Code (IRC)
• 2012 & 2015 International Energy Conservation Code (IECC)
• California Energy Commission Title 24

Specifications

? TABLE 1 - SPECIFICATIONS

?️ FIGURE 1 - DIMENSIONS (INCHES)

Diagram showing the dimensions of the ventilator unit. Key dimensions include:

• Overall Height: Approximately 14.31 inches
• Overall Width: Approximately 17.15 inches (front view), 22.13 inches (side view)
• Overall Depth: Approximately 27.75 inches
• Inlet Collar: Round, for 6" diameter duct
• Outlet Collar: Oval, for 6" diameter duct
• Control Unit (not included on Model 8140NC) housing dimensions are also indicated.

Installation

Install Electrical Outlet

Install a standard NEMA 5-15 receptacle suitable for the location, near where the ventilator will be installed. The ventilator comes equipped with a 6-foot power cord with a standard 3-prong plug.

Ventilator Location and Orientation

⚠️ CAUTION

1. Mount the blower with the lowest, exposed moving parts at least 8 feet (2.4 m) above floor or grade level.
2. Mount the blower at least 3.3 feet (1.0 m) from any accessible opening of the duct.

Choose a location for the ventilator that is within 6 feet of the outlet into which the ventilator will be plugged. Allow space for filter removal and service as shown in ?️ FIGURE 2. The ventilator can be mounted in any orientation.

?️ FIGURE 2 - CLEARANCES FOR SERVICING

Diagram illustrating required clearances around the ventilator for maintenance. It shows 10 inches for filter access and 24 inches for motor access.

Mount the Ventilator

1. Install the mounting brackets, using the supplied #8 x 1/2" screws, to the side of the housing as shown in ?️ FIGURE 3. Use the holes nearest the covers for mounting to floor joists or hanging from rafters. Use the holes near the bottom of the unit for mounting to a flat wall or ceiling surface.

2. Secure the ventilator into joists or a strong platform and screw into place using the #10 x 3/4" screws provided. The ventilator weighs approximately 25 pounds, so do not secure it into drywall alone.

?️ FIGURE 3 - MOUNTING BRACKET POSITIONING

Diagrams showing three mounting options: Mounted to the joist, Mounted to wall or floor joists (showing bracket locations), and Hung from the joist. An airflow direction arrow is also indicated.

Mount Intake Hood

Install a weather-tight hood with a bird screen. Cut a hole in the exterior wall that is large enough to fit a 6" insulated flexible duct through with minimal compression of the insulation. Pull the duct through the hole and attach the flex duct to the collar of the hood. Use metal foil tape or a plastic zip-tie to secure the duct to the collar. Pull the insulation and vapor barrier over the duct and tape it to the collar.

❗ IMPORTANT: The end of the insulation must be sealed to prevent condensation from forming inside the insulation. If a plastic zip-tie is used to secure the insulation to the hood collar, also tape the end to seal it against condensation problems.

Press the hood against the outside wall and secure in place with screws; seal around the perimeter of the hood with caulk.

Install Ductwork

Install 6" diameter flexible, insulated duct from the round inlet collar of the unit to the intake hood and from the oval outlet collar of the unit to the HVAC system. Duct the outlet of the ventilator to the return side of the HVAC system (refer to ?️ FIGURE 4).

❗ IMPORTANT: The end of the insulation must be sealed to prevent condensation from forming inside the insulation. If a plastic zip-tie is used to secure the insulation to the hood collar, also tape the end to seal it against condensation problems.

?️ FIGURE 4 - DUCTING IN UPFLOW AND HORIZONTAL HVAC SYSTEMS

Diagrams illustrating typical attic and basement installations showing the fresh air intake hood, ductwork, ventilator, filter, and connection to the HVAC system (furnace/air handler). Airflow direction is indicated.

Model 8140NC Wiring

Wiring to Various Controls

Suggested Controls:

• Aprilaire IAQ Control Models 8910, 8910W or 8920W
• Aprilaire Thermostat Models 8620 or 8620W
• Model 8120A or 8120X Digital Ventilation Controller

Select the diagram that corresponds to the control to be used. Wire the controls to the HVAC equipment and any other IAQ accessory in accordance with the literature provided with the control.

?️ FIGURE 5 - WIRING TO IAQ CONTROL

Diagram showing wiring connections for an Aprilaire IAQ Control Module. It lists terminal connections like R, RC, RH, W, W2, Y, Y2, G, L, etc., and shows connections to a VENT terminal.

?️ FIGURE 6 - WIRING TO THERMOSTAT

Diagram showing wiring connections for an Aprilaire Model 8620/8620W Thermostat. It lists terminal connections like 12, C, 11, O/B, Y2, G, RC, RW2, W, L, S2, S1, T1, T2, and shows connections to a VENT terminal.

?️ FIGURE 7 - WIRING TO MODEL 8120A

Diagram showing wiring connections for the Model 8120A Digital Ventilation Controller. It lists terminals like POWER, R, C, ODT, WG, Gf, and OUTPUTS like VENT.

?️ FIGURE 8 - WIRING TO MODEL 8120X

Diagram showing wiring connections for the Model 8120X Digital Ventilation Controller. It lists terminals like R, C, ODT, Y, W, G1, Gs, Gh, and shows connections to VENT terminals.

? NOTE 1: An outdoor temperature sensor must be installed to use outdoor temperature limits for ventilation control.

Model 8140NC Operation

Test Mode

After all ducting and wiring is complete, plug in the ventilator, restore power to the HVAC system and make sure the switch controlling the outlet into which the ventilator is plugged (if applicable) is turned on.

1. Use the installed control to complete a circuit between the VENT terminals on the 8140NC.
2. Verify that the ventilator blower starts and that the integral damper opens.
3. If the ventilator has been wired to turn on the HVAC blower with ventilation, verify that the blower is on.
4. Measure the airflow (CFM) that the installed ventilator is delivering. See MEASURE DELIVERED AIRFLOW section on page 8.
5. Using the instructions provided with the installed control, adjust the ventilation settings as required.

Sequence of Operation

Refer to the installation manual provided with the control that is wired to the Model 8140NC.

Model 8140 Wiring

Wiring the Control to the HVAC System

⚠️ NOTICE

Disconnect power to HVAC system during wiring to avoid electrical shorts.

1. Remove the control from the mounting plate as shown in ?️ FIGURE 9. Set control aside in a safe place until all wiring has been completed.

2. Run a 6-conductor (min.) cable (for furnace/AC applications) or a 7-conductor (min.) cable between the control and the HVAC system.

3. Wire to the HVAC system in accordance with ?️ FIGURE 10 if installed in a furnace/AC application or ?️ FIGURE 11 if installed with a heat pump.

?️ FIGURE 9 - REMOVE CONTROL FROM MOUNTING PLATE

Diagram showing the control mounting plate and the control connector, illustrating how to remove the control.

?️ FIGURE 10 - WIRING VENTILATION CONTROL TO A FURNACE

Diagram showing wiring between a thermostat, ventilation control, and a furnace. Terminal designations (R, C, Y, W, G, GS, GH, ODT, VENT) are shown for each component. Notes explain the function of R&C (24 VAC), Y (Cooling), W (Heat), GS (Fan Input), GH (Fan Output).

?️ FIGURE 11 - WIRING VENTILATION CONTROL TO A HEAT PUMP

Diagram showing wiring between a heat pump thermostat, ventilation control, and a heat pump. Terminal designations (R, C, Y, W1, O, G, GS, GH, ODT, VENT) are shown. Notes explain the function of R&C (24 VAC), Y (Compressor), W1 (1st Stage Aux. Heat), O (Rev. Valve, Cooling), GS (Fan Input), GH (Fan Output).

Connecting the Control to the Ventilator

Plug the Control Connector into the back of the control at the location shown in ?️ FIGURE 12. Route the connector wire through the channels in the control and reattach the control to the mounting plate. Restore power to the HVAC system and plug in the ventilator when complete.

?️ FIGURE 12 - PLUG THE CONTROL INTO THE VENTILATOR

Diagram showing the control mounting plate, the back of the control unit, and the front of the control unit, illustrating how to connect the control to the ventilator.

Operation

The display will appear faint normally; the first press of any button will turn on the display at full power.

The display shows the ventilation time setting (minutes/hr), mode of operation (Code or Comfort) and whether the HVAC fan has been turned on when ventilating.

Control Display Features:

• Verification Area: Use for Rater/Inspector Verification. Press and hold for 5 seconds to enter Test Mode or Set Up Menu.
• Status Light: Lights green when ventilating.
• Ventilation Time Setting: Use to override the calculated ventilation time setting (6 – 60 minutes/hr). Press and hold to turn ventilation OFF. To return to the calculated setting, go completely through the Set Up Menu.

Testing and Setup

Model 8140 - Test Mode

After wiring and set up have been completed, Test Mode can be used to verify that all components in the ventilation system function and that wiring to the HVAC system fan is correct.

1. Hold for 5 seconds.

2. Select

3. Select

? TABLE 2 - MODEL 8140 TEST MODE MENU

Measure Delivered Airflow

1. Make sure the ventilator is plugged in and wired to an external control (Model 8140NC) or that the integral control is wired to the HVAC system (Model 8140).

2. Use 1/4" flexible tubing to attach a pressure gauge set to " w.c. (sometimes shown as "in. w.g." or "in. H2O") to the inlet and outlet pressure ports on the ventilator. The pressure gauge should have as small a range as possible to get a meaningful measurement – a range of 1.0" w.c. should be sufficient. Connect the high or “+” port of the gauge to the outlet pressure port on the ventilator, and the low or “-” port of the gauge to the inlet pressure port on the ventilator. See ?️ FIGURE 13.

3. Model 8140NC – Turn on the ventilator using the installed control for the Model 8140NC. This can be done by temporarily changing the ventilation setting to 60 minutes/hour or you can simply place a jumper between the VENT terminals of the ventilator.

4. Model 8140 – Turn on the ventilator by using the “Up” button to increase the ventilation setting to 60 MIN./HR.

5. Use the label on the cover of the ventilator, or ? TABLE 3, to convert the pressure reading to delivered airflow. If the pressure reading falls between listed values, either use the lower value or interpolate between values: CFM = Lower Value + [(Higher Value – Lower Value) * 10 * (Pressure Reading – Lower Value Pressure)]. The following is an example:

• a. Measured Pressure Reading is 0.34" w.c.
• b. Table 2 lists 205 CFM @ 0.3" w.c. and 175 @ 0.4" w.c.
• c. Either use 175 CFM or interpolate: CFM = 175 + [(205-175) * 10 * (0.34-0.3)] = 175 + [(30) * 10 * (.04)] = 175 + 12 = 187 CFM

Interpolating will demonstrate higher delivered airflow, but requires a calculation to be done.

?️ FIGURE 13 - MEASURE PRESSURE AT INLET AND OUTLET PRESSURE PORTS

Diagram showing a pressure gauge connected to the inlet and outlet ports of the ventilator. Ports are labeled 'Lo' (-) and 'Hi' (+).

? TABLE 3 - DELIVERED AIRFLOW CORRESPONDING TO MEASURED PRESSURE AT VENTILATOR PRESSURE PORTS

Model 8140 - Set Up

⚠️ NOTICE

Before setting up the control for use, the amount of ventilation air being delivered (CFM) by the installed ventilation system must be measured.

1. Hold for 5 seconds, then release.

2. Select

Throughout the Set Up Menu, the ⬆️ and ⬇️ buttons are used to change values, the Select button is used to enter the value and move on to the next Set Up Menu item.

? TABLE 4 - MODEL 8140 SET UP MENU

? TABLE 4 - MODEL 8140 SET UP MENU (Continued)

When all Set Up Menu options have been entered, the control will display done.

❗ IMPORTANT NOTE: The 8140 control senses the temperature and humidity of the outdoor air. To prevent extended periods of inactivity, set the control mode to codE, or if setting to cFrt (comfort), set the RH limits to OFF.

Model 8140 - Rater/Inspector Verification

To verify the ventilation time setting, press the Select button to scroll through the calculated Required Continuous CFM and the Measured CFM for this installation. If any value does not match the expected value, the Set Up Menu must be entered to change the floor area, number of bedrooms or measured CFM.

The calculation used for the ventilation time setting is (all calculations compliant with ASHRAE Standard 62.2-2010):

Minutes per Hour = 60 * (Required Continuous CFM / Measured CFM)

Measured CFM is entered during set up and Required Continuous CFM is calculated according to the equation below:

Required Continuous CFM = ((Floor Area ft² * 0.01) + (No. of Bedrooms + 1) * 7.5)

Model 8140 - Sequence of Operation

"CODE" SETTING

The control will turn on ventilation with a heating, cooling or fan call for the set number of minutes during a one-hour cycle period. If the outdoor temperature is above the high temperature ventilation limit, ventilation will not occur with a cool or fan call, but if it is below the low temperature ventilation limit it will occur with a heat call. If the HVAC equipment does not turn on enough to meet the ventilation time within the hour, the control will turn on ventilation without a call, if the outdoor air temperature is within the high and low ventilation temperature limits. The control will also turn on the HVAC system blower, if wired and set up to do so.

If the outdoor temperature exceeds the limits set at the end of the first hour, then no additional ventilation will occur for another 60 minutes, and the cycle period will automatically adjust to four hours. When the ventilator starts again, it will sample the air temperature and if in range, will meet the set amount of ventilation during the four-hour cycle period. For example, if the Vent Time was set to 25 minutes per hour and the air temperature fell below the low limit setting ventilation would only occur during a heating call. If the heating only operated for 10 minutes during the hour, the control will automatically change the cycle period to four hours and work to provide the additional 90 total minutes of ventilation (25 min/hr * 4 hours = 100 minutes, minus the 10 minutes of ventilation that occurred during heating) during the four-hour cycle period.

If the air temperature is still out of range, the control will automatically switch to an 8-hour cycle period, then a 12-hour cycle period and finally a 24-hour cycle period. During 8, 12 and 24 hour cycle periods, the total ventilation time increases to compensate for ventilation effectiveness as defined in ASHRAE Standard 62.2-2010. When the cycle period automatically adjusts to 24-hours, the control will turn on ventilation to meet the requirements even if the temperature is outside of the set limits.

"COMFORT" SETTING

The control will turn on ventilation with a heating, cooling or fan call by the HVAC equipment, if the outdoor air temperature is within the high and low ventilation temperature limits and the outdoor RH is within the high and low RH limits, for the set number of minutes during a one-hour cycle period. If the HVAC equipment does not turn on enough to meet the ventilation time within the hour, the control will turn on ventilation without a call, if the outdoor air temperature and indoor RH is within the set limits. The control will also turn on the HVAC system blower, if wired and set up to do so.

Maintenance

Filter Cleaning

Normally, the fresh air filter will need to be removed and cleaned every six months, but check it after the first three months following installation to determine if more or less frequent cleaning will be necessary. After cleaning the filter inside the ventilator, clean off the screen at the fresh air intake hood on the outside of the house. The most common cause of reduced ventilation is a clogged air intake hood.

To clean the ventilator filter:

1. Remove the two screws securing the filter door to the housing and swing open the door (?️ FIGURE 14).
2. Rotate the plastic filter retainer to release the filter and remove it from the ventilator (?️ FIGURE 15).
3. Use water to rinse the filter and shake the excess moisture off the filter.
4. Replace the filter in the ventilator, turn the filter retainer to secure it in the housing, and close and secure the filter door.

?️ FIGURE 14

Diagram showing the filter door on the ventilator housing, with screws indicated for removal.

?️ FIGURE 15

Diagram showing the plastic filter retainer being rotated to release the filter.

Technical Information

Internal Schematics

?️ FIGURE 16 - MODEL 8140 INTERNAL SCHEMATIC

Wiring diagram for the Model 8140 internal components, including the blower, run capacitor, damper motor, power PCB assembly, and ventilation controller terminals (R, ODT, C, Y, W, O, Gs, VENT, Gh). It notes that capped red & white wires inside the filter door are for powering the control directly if not wired to the HVAC system.

?️ FIGURE 17 - MODEL 8140NC INTERNAL SCHEMATIC

Wiring diagram for the Model 8140NC internal components, similar to the 8140 but showing connections to a terminal block. Components include blower, run capacitor, damper motor, power PCB assembly.

Warranty Information

Limited Warranty

Your Research Products Corporation Aprilaire® Fresh Air Ventilator 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 any component 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 model number and installation date of the ventilator.

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 VENTILATOR 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 DEFECTS(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

Visit us online at www.aprilaire.com to register your Aprilaire product. If you do not have online access, please mail a postcard with your name, address, phone number, email address, product purchased, model number, date of purchase, and dealer name and address to: Research Products Corporation, P.O. Box 1467, Madison, WI 53701.

Your warranty registration information will not be sold or shared outside of this company.

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