Broan B70DHV Installation & Operation Instructions
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Broan B70DHV Installation & Operation Instructions

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B70DHV
Installation & Operation Instructions
The B70DHV is a ventilating dehumidifier that is
integrated into the heating and cooling system to
provide the ultimate in comfort, health and property
protection through:
+ Dehumidification
+ Fresh Air Ventilation (Optional)
+ Air Filtration
800.558.1711
800.558.1711
Serial Number
Install Date
Sold By
Installation & Operation Instructions
1
TS-1127 08/21 Rev A

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Summary of Contents for Broan B70DHV

  • Page 1 B70DHV Installation & Operation Instructions The B70DHV is a ventilating dehumidifier that is Serial Number integrated into the heating and cooling system to Install Date provide the ultimate in comfort, health and property Sold By protection through: + Dehumidification + Fresh Air Ventilation (Optional) + Air Filtration 800.558.1711...

  • Page 2: Table Of Contents

    MERV Rating Chart ................14 Service ......................15 Warranty ......................17 FOR REPAIR & TECH SUPPORT: 1-800-558-1711 (follow prompts) Broan is committed to manufacturing quality products. To maintain our standards, product specifications may change without notice. 926 West State Street, Hartford, WI 53027 www.Broan-Nutone.com 800-558-1711 Installation &...

  • Page 3: Safety Instructions

    CAUTION! THIS SYMBOL MEANS IMPORTANT INSTRUCTIONS. FAILURE TO HEED THEM CAN RESULT IN INJURY OR MATERIAL PROPERTY DAMAGE. Registrations This Broan dehumidifier conforms to unified standard UL 60335-2-40 and CSA Standard C22.2.60335- 2-40. WARNING! WARNING! 120 VOLTS MAY CAUSE SERIOUS INJURY FROM ELECTRIC SHOCK.

  • Page 4: Dehumidifier Set Up

    • DO NOT place the dehumidifier directly on structural building members without vibration absorbers or unwanted noise may result. Place the B70DHV on supports to raise the base of the unit. • A drain pan with a float switch MUST be placed under the dehumidifier if installed above a living area or above an area where water leakage could cause damage.

  • Page 5: Attaching Duct Collars

    ATTACHING DUCT COLLARS Fresh Air Ventilation Duct Fresh air ventilation is optional. If setting up the unit to provide fresh air ventilation, see page 10. Return Air Inlet An 8” diameter duct collar is attached to the unit. Supply Air Outlet The back panel of the dehumidifier can be rotated to allow for horizontal flow through or vertical flow through of the supply air.

  • Page 6: Electrical Requirements

    ELECTRICAL REQUIREMENTS The B70DHV plugs into a common grounded 115VAC outlet. The device draws 5.1 Amps at 80°F and 60% RH. Locate the dehumidifier in an area where the cord’s length (9') easily reaches a 115 VAC electrical outlet with a minimum of 15 Amp circuit capacity. If used in an area that may become wet, a GFCI protected circuit is recommended.

  • Page 7: Drain Installation

    1" per 10'. An optional condensate pump kit is available for use with the B70DHV and may be installed if lift is required to dispose of condensate. Condensate is automatically pumped to a remote location when the water level in the pump’s reservoir rises to close the float switch.
  • Page 8 Ducting Considerations: • All flexible ducting connected to the B70DHV should be UL listed. • A short piece of flexible ducting on all B70DHV duct connections is recommended to reduce noise and vibration transmitted to rigid ductwork in the structure.

  • Page 9: Ducting To Hvac Systems

    • Install a dedicated 8" air return for the B70DHV from a central area of the structure. • Duct the supply of the B70DHV to the supply of the existing HVAC system with a backdraft damper. • If the existing system has multiple returns, instead of installing a dedicated return to the B70DHV, it is possible to select one to disconnect from the existing HVAC system and use it for the dedicated B70DHV return.

  • Page 10: Fresh Air Ventilation

    Fresh air may be brought into the structure by connecting an insulated duct from outside the structure to a tee located in the inlet duct of the B70DHV. A ventilation control is needed to program the time and frequency that the unit introduces outside air. The time and frequency of ventilation should be based on the size and occupancy of the residence.

  • Page 11: Determine Ventilation Requirements

    FRESH AIR VENTILATION Determine Ventilation Requirements The MINIMUM ventilation requirement is calculated using ASHRAE 62.2-2016. Use one or both of the options below to determine your ventilation requirement. Follow all local and national building and safety codes. Option 1: Calculating Airflow Requirement Using ASHRAE 62.2-2016 Airflow Equation ASHRAE Airflow in CFM = [House Area in Sq.Ft.

  • Page 12: Controls

    The B70DHV features a built-in dehumidistat control as well as the ability to wire a remote mounted control to the unit. If the B70DHV is located outside of the area where humidity control is desired, consider using a remote wired humidity controller that is located in the area where humidity control is desired.

  • Page 13: Air Filtration

    AIR FILTRATION The B70DHV is equipped with a MERV-13 (Dimensions: 0.75” x 9.00” x 11.38”) air filter. The filter should be checked and replaced every three to six months. Operating the unit with a dirty filter will reduce dehumidifier capacity and efficiency.

  • Page 14: Merv Rating Chart

    AIR FILTRATION MERV Rating Chart Standard 52.5 Minimum Standard 52.5 Minimum Efficiency Reporting Dust Spot Typical Controlled Typical Applications and Efficiency Reporting Typical Applications and Dust Spot Typical Controlled Efficiency Arrestance Contaminant Limitations Typical Air Filter/Cleaner Type Value Limitations Typical Air Filter/Cleaner Type Value Efficiency Arrestance...

  • Page 15: Service

    SERVICE Troubleshooting CAUTION! CAUTION! TROUBLESHOOTING SHOULD BE PERFORMED BY A QUALIFIED HVAC TECHNICIAN. Symptom Possible Reason Troubleshooting Procedure Neither fan nor 1. Dehumidifier unplugged WARNING! WARNING! or no power to outlet. compressor 2. Humidity control set running. ELECTRICAL SHOCK HAZARD: too high.
  • Page 16 Refrigerant Charging WARNING! WARNING! SERVICING THE B70DHV WITH ITS HIGH PRESSURE REFRIGERANT SYSTEM AND HIGH VOLTAGE CIRCUITRY PRESENTS A HEALTH HAZARD WHICH COULD RESULT IN DEATH, SERIOUS BODILY INJURY, AND/OR PROPERTY DAMAGE. SERVICE MUST BE PERFORMED BY A QUALIFIED SERVICE TECHNICIAN.

  • Page 17: Warranty

    Limited Warranty. Any delay or failure by Broan to exercise any right or remedy will not constitute a waiver of Broan to thereafter enforce such rights.

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