Broan FRESH IN™ FIN-6MD Installation Instructions

Important Safety Information

Please take note that this manual uses the following symbols to emphasize particular information:

⚠ WARNING: Identifies an instruction which, if not followed, might cause serious personal injuries including possibility of death.

CAUTION: Denotes an instruction which, if not followed, may severely damage the unit and/or its components.

Note: Indicates supplementary information that may relate to optional parts or simply aim to facilitate a task.

General Warnings

⚠ WARNING: TO REDUCE THE RISK OF FIRE, ELECTRIC SHOCK, OR INJURY TO PERSON(S) OBSERVE THE FOLLOWING:

• Use this unit only in the manner intended by the manufacturer. If you have questions, contact the manufacturer.
• Before cleaning this unit, turn off the power to the AHU at the service panel. (Powered by AHU)
• This unit is not designed to provide combustion and/or dilution air for fuel-burning appliances.
• Installation work must be done by qualified person(s) in accordance with all applicable codes and standards, including fire-rated construction.
• When cutting or drilling into a wall or ceiling, do not damage electrical wiring and other hidden utilities.
• When cleaning or performing installation of this unit, it is recommended to wear safety glasses and gloves.
• When applicable local regulation comprises more restrictive installation and/or certification requirements, the aforementioned requirements prevail on those of this document and the installer agrees to conform to these at his own expense.
• The unit must be mounted at least 3.3 feet (1.0 meter) away from any accessible opening of the duct.
• Must be powered using a Class 2 transformer rated 10VA or higher.

General Cautions

CAUTION:

• Please read the specification label on the product for further information and requirements.
• Do not intake air into spaces within walls or ceiling or into attics, crawl spaces, or garages. Do not attempt to recover the exhaust air from a dryer or a range hood.
• Intended for residential installation only in accordance with the requirements of NFPA 90B.
• When leaving the house for a long period of time (more than two weeks), a responsible person should regularly check if the unit operates adequately.
• At least once a year, the unit's mechanical and electronic parts should be inspected by qualified service personnel.
• Since the electronic control system of the unit uses a microprocessor, it may not operate correctly because of external noise or very short power failure. If this happens, turn power off at the AHU service panel and wait approximately 10 seconds. Then, restore the power to the unit.
• Outdoor intake hood must be weather tight and comprise a bird screen.
• Should you decide to dispose of this unit or of parts of it, do so in accordance with local laws and regulations.

1. Preparation

Before you start:

Choose the best location and installation type for the FIN-6MD according to the current system. Ducting widely affects the performance of this type of device. Use the shortest, straightest duct run possible to maximize the results.

CAUTION: Do not install in an area where the temperature may exceed 160°F.

The installer shall ensure that, if necessary, an in-line heater sized according to the required airflow and outside design heating temperature from Manual J or ASHRAE table is installed to ensure that the air delivered to the AHU is never below the minimum temperature allowed by the manufacturer. The in-line heater shall have an integrated airflow sensor and an over temperature sensor to prevent heating in no-flow or low-flow conditions.

When deciding if a preheater is required and whether it should be installed BEFORE or AFTER the FIN-6MD, consider the following:

• The FIN-6MD's minimum operating temperature is -4°F.
• The temperature distributed to the AHU should never be below the temperature recommended by the AHU manufacturer.
• The minimum distance between the preheater and the FIN-6MD is 12 inches.

2. Installation

Always respect the orientation of the FIN-6MD and the direction of the airflow, as indicated on the unit.

Direct-to-AHU Installation

This is the fastest and easiest method:

1. Make a 6-inch diameter hole in the return duct of your AHU.
2. Install the seal on the FIN-6MD port that will insert into the AHU ducting. Make sure that the direction of the airflow indicated on the unit is respected.
3. Install the 3 installation brackets on the unit.
4. Mark and drill holes for the brackets on the AHU ducting and, using appropriate screws, secure the FIN-6MD to the duct of the AHU, making sure it is level horizontally. (Self-drilling screws are recommended to avoid marking and drilling steps.)
5. Follow steps in section 3 to connect the insulated duct to the FIN-6MD.
6. Perform the electrical connection to the AHU following the wiring diagram in section 4.

Installation Through a Horizontal Surface

1. Make a hole in the surface that the duct will run through. Size the hole so that the vapor barrier of the insulated ducting is not damaged, and the insulation is not compressed.
2. Install the 3 installation brackets on the unit.
3. Run a piece of insulated duct through the hole and connect to the FIN-6MD following the steps in section 3. Make sure the direction of the airflow as indicated on the unit is respected.
4. Push the excess ducting on the other side of the surface and, using appropriate screws, secure the FIN-6MD to the surface.
5. Run the insulated duct to the AHU and connect to the AHU ducting, making sure that the vapor barrier sealing is leak-free.
6. Follow steps in section 3 to connect the second insulated duct to the FIN-6MD.
7. Perform the connections to the AHU following the wiring diagram in section 4.

Mounting Under, Above, or Beside a Structure

The unit can be mounted in various orientations: under, above, beside, or suspended.

1. Install 2 installation brackets on the unit, according to the surface the unit will mount to.
2. Using appropriate screws, secure the FIN-6MD to the structure, making sure it is level horizontally. Make sure the direction of the airflow as indicated on the unit is respected.
3. Follow steps in section 3 to connect both insulated ducts to the FIN-6MD.
4. Run the insulated duct to the AHU and connect to the AHU ducting, making sure that the vapor barrier sealing is leak-free.
5. Perform the connections to the AHU following the wiring diagram in section 4.

3. Connecting the Insulated Ducts to the Unit

CAUTION: Always use insulated ducting of a minimum R-4 insulation factor.

1. Slide the inner flexible duct over the port and secure it using a tie wrap.
2. Pull the insulation over the flexible duct and port without compressing it.
3. Use duct tape to seal the outer membrane of the insulated duct to the outer ring of the port.

⚠ WARNING: Make sure the outdoor intake hood is at least 18 inches above the ground and 6 feet away from any of the following: Dryer exhaust, high-efficiency furnace vent, central vacuum vent, gas meter exhaust, gas barbecue-grill, any exhaust from a combustion source, garbage bin and any other source of contamination.

Note: Make sure that the outdoor intake hood is easily accessible for annual maintenance. If located above the first floor, place it close to a window or balcony to allow easy access.

4. Wiring Diagram

⚠ WARNING: Risk of electric shock. Electrical wiring must be done by qualified personnel in accordance with all applicable codes and standards. Before connecting wires, switch off the power to the AHU at the service panel and lock service disconnecting means to prevent power from being switched on accidentally.

CAUTION: Faulty connections can cause damage to the AHU, to the thermostat and/or to this unit. Always double check connections before turning power back on.

Wiring Color Code

• BLK: BLACK
• BLU: BLUE
• GRN: GREEN
• PNK: PINK
• RED: RED
• WHT: WHITE
• YEL: YELLOW

Wiring Diagram Description

The diagram illustrates the connections for the FIN-6MD unit. It includes:

• Low voltage field wiring and low voltage factory wiring.
• Terminal blocks J1, J4, J5, J6, J7, J9.
• Components: MCU (Microcontroller Unit), LED1 (power indicator), LED2 (status indicator), M2 (Damper Motor), S1 (Humidity/Temperature Sensor), K1, K2 (likely relays or drivers), PTC (Positive Temperature Coefficient resistor).
• Power supplies: 12V, 3.3V, and +24VAC supply.
• Connections for the Damper Motor Harness.
• Accessory connections, including for the FIN-DCS Accessory Kit.
• A standby switch (SO/SI).
• Voltage Detection (K1).

The terminal block can be removed for easier connection. Use the included tie wrap and the loop above the terminal block to secure the wires and reduce the risk of broken connections.

AHU Wiring Options

This section details how to connect the FIN-6MD to an Air Handling Unit (AHU) and thermostat.

• CFIS System: Shows connections to J4 terminals (Y, W, GF, NC, G, COM, NO, R, C).
• Thermostat: Standard thermostat wiring (Y, W, G, R, C).
• AHU: Connections to the AHU (Y, W, G, R, C).
• Mandatory Installation Wiring: CFIS Internal Hard Connections.
• Optional Installation Wiring for Synchronization: Dotted lines indicate how to synchronize FIN-6MD operation with heating/cooling run-time to prevent unnecessary central fan operation.

The diagram references 'Ref.: 1103507 rev. C'.

5. Setting Up the Unit

When powered ON, the FIN-6MD performs a 30-second booting sequence followed by a 30-minute period where it stays OFF, but will activate if a heating or cooling call is sent to the AHU.

Refer to local building codes to determine the required airflow.

1. Double-check the wiring, and turn power back ON to the AHU.
2. Set the thermostat to send a heating or cooling call, or jump R and Y on the terminal block. This will force the ventilation ON for at least 5 minutes.
3. Measure the airflow. If it needs adjustment, proceed to step 4. If not, go to step 5.
4. The damper is factory set to the fully open position. To adjust it, set the left pot to 'DAMPER ADJUSTMENT' to start the AHU blower and wait 5 seconds. The LED will blink continuously to indicate the unit is in DAMPER ADJUSTMENT mode. While measuring the airflow, adjust the damper using the 'RUN TIME %' pot until the desired value is reached.
5. Select the desired mode according to the table and map in section 7.3. This also saves the damper adjustment.
6. Set the 'RUN TIME %' pot. The formula is: Run time % = Required Airflow / Measured Airflow. (Example: Run Time % = 60 CFM / 120 CFM = 50%)
7. Install the supplied cover to protect the adjustment pots and prevent accidental changes.

6. Testing

The FIN-6MD performs a 30-second booting sequence upon power-on, followed by a 30-minute OFF period, activating only if a heating or cooling call is received by the AHU.

6.1 Blower Door Test (Force the Damper Closed)

If access to the integrated or remote switch is easy, set it to OFF. If access is difficult (e.g., in an attic):

1. Turn OFF the power to the AHU at the service panel.
2. Turn the power back ON at the service panel.
3. Wait 30 seconds for the booting sequence.
4. Ensure the thermostat does not send a heating or cooling call.
5. The unit will remain OFF with its damper closed for 30 minutes, but will activate if a call is received.

6.2 Ventilation Test (Forcing the Unit On)

1. Turn OFF the power to the AHU at the service panel, and ensure the integrated or remote switch is set to ON.
2. Turn the power back ON at the service panel.
3. Wait 30 seconds for the booting sequence.
4. Set the thermostat to send a heating or cooling call, or jump R and Y on the terminal block. This will force the ventilation ON for at least 5 minutes.

7. User Information

7.1 Integrated and Remote Switches

The unit is equipped with an integrated ON/OFF switch. For convenience, a remote switch can also be connected. To use a remote switch, disconnect the integrated switch and connect the remote switch in the same manner.

7.2 User Servicing Instructions

• Inspect the outdoor air intake at least once a year.
• These recommendations may change according to environmental conditions in your area.

7.3 Comfort Mode Selection

If the indoor air becomes too humid, or to prevent such conditions, the operation mode can be changed from Code-Compliant (modes 1 and 2) to Comfort Mode (modes A to E). Refer to the map for the correct choice.

When changing modes, only change the 'Mode' setting and leave the 'Run Time %' as set by the installer. Consult your HVAC contractor if in doubt.

Climate Zone Map and Mode Selection

A map of the United States is provided, color-coded to represent different climate zones (1 through 5, with sub-zones like 2A, 2B, 3A, etc.) used for selecting the appropriate comfort mode. The table below lists the modes and their recommended climate zones:

*Refer to the label on the unit for the full limits table. **As defined by the Department of Energy.

The unit has adjustment pots for 'DAMPER ADJUSTMENT' and 'RUN TIME %'. The 'DAMPER ADJUSTMENT' pot can set the damper from fully open to half open. The 'RUN TIME %' pot sets the operational percentage.

7.4 Troubleshooting

An LED indicator on the unit communicates different states:

• 1 blink (Sensor error): Disconnect and reconnect the terminal block. If the error persists, replace the unit.
• 2 blinks (Damper error): Disconnect the terminal block. Open the unit, inspect and remove any debris hindering damper movement. Close the unit and reconnect the terminal block. If the error persists, replace the unit.
• Continuous blink (Damper adjustment mode): This is normal while the unit is in adjustment mode.
• 1s ON, 10s OFF (Learning mode): This is normal and will blink for 48 hours after being powered ON.

8. Available Accessories

1. Service Parts: The S1103502 replacement hardware kit is available, containing the same components as the original kit.
2. Dry Contact Synchronization: The FIN-6MD can be synchronized with other HVAC units via a 24 VAC dry contact using the FIN-DCS option kit. This can be used for 'Output mode' (to activate other units) or 'Input mode' (to activate the FIN-6MD). Note: This functionality will not work if the unit is turned off.

For complete warranty statement and product registration, visit www.broan-nutone.com.

Contact Broan-NuTone LLC, Hartford, Wisconsin, at 800-558-1711.