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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-2084 02/25 Rev B
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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...
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Page 2: Table Of Contents
Drain Installation ...................7 Ducting to HVAC Systems ................8 Fresh Air Ventilation ..................10 Controls .......................12 Air Filtration ....................13 Service ......................15 Warranty ......................21 This Broan dehumidifier conforms to unified standard UL 60335-2-40 and CSA Standard C22.2.60335-2-40. Brand Name Individual Basic Model Rating Integrated Energy... -
Page 3: Safety Instructions
PROPERTY DAMAGE. Read the installation, operation and maintenance instructions carefully before installing and operating this device. Proper adherence to these instructions is essential to obtain maximum benefit from the Broan Whole House Ventilating Dehumidifier. WARNING! 120 VOLTS MAY CAUSE SERIOUS INJURY FROM ELECTRIC SHOCK. DISCONNECT ELECTRICAL POWER BEFORE STARTING INSTALLATION OR SERVICING, AND LEAVE POWER DISCONNECTED UNTIL INSTALLATION OR SERVICE IS COMPLETED. -
Page 4: Location Considerations
DEHUMIDIFIER SET UP Location Considerations • Allow sufficient clearance to handle the unit’s overall dimensions as well as the 6" MINIMUM CLEARANCE ELECTRICAL SERVICE FOR PROPER AIR FLOW ACCESS THIS SIDE necessary return and supply ductwork to the unit. • Allow sufficient clearance for filter removal and to prevent airflow obstruction. -
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
There are multiple control devices that can be used with B70DHV. The controls are to be located remotely from the dehumidifier and placed in the space to be conditioned. Low voltage (24 Volt) controls can be used with the B70DHV and MUST be connected with low voltage (18-22 gauge) thermostat wire. -
Page 7: Front View
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 To Hvac Systems
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 • 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.
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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
CONTROLS A control can be used with the B70DHV. Broan offers the DEH 3000 proprietary control. The DEH 3000 monitors and controls relative humidity and proper ventilation levels in their home. This control is also available with a remote sensing option. The B70DHV features a built-in dehumidistat control as well as the ability to wire a remote mounted control to the unit. -
Page 13: Changing The Filter
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: Technical Description
SERVICE WARNING! SERVICING THE DEHUMIDIFIER 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. ONLY QUALIFIED SERVICE PEOPLE SHOULD SERVICE THIS UNIT. Warranty A warranty certificate has been enclosed in this manual; read it before any repair is initiated. If a warranty repair is required, call the factory first at 1-877-420-1330 for warranty claim authorization and technical assistance. - Page 16 • Intrinsically safe components are the only types that can be worked on while live in the presence of a flammable atmosphere. The test apparatus shall be at the correct rating. • Replace components only with parts specified by BROAN. Other parts may result in the ignition of refrigerant in the atmosphere from a leak.
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Page 17: Charging Procedures
SERVICE Detection of Flammable Refrigerants Under no circumstances shall potential sources of ignition be used in the searching for or detection of refrigerant leaks. A halide torch (or any other detector using a naked flame) shall not be used. The following leak detection methods are deemed acceptable for all refrigerant systems: •... -
Page 18: Refrigerant Recovery
SERVICE Decommissioning Before carrying out this procedure, it is essential that the technician is completely familiar with the equipment and all its details. It is recommended good practice that all refrigerants are recovered safely. Prior to the task being carried out, an oil and refrigerant sample shall be taken in case analysis is required prior to re-use of recovered refrigerant. -
Page 19: Troubleshooting Procedure
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 20 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.
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Page 21: 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. - Page 22 Installation & Operation Instructions 800.558.1711...
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