Broan B70DHV Montageanleitung
1
800.558.1711 Installation & Operation Instructions
Serial Number
Install Date
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Installation & Operation Instructions
The B70DHV is a ventilating dehumidier that is
integrated into the heating and cooling system to
provide the ultimate in comfort, health and property
protection through:
+ Dehumidication
+Fresh Air Ventilation (Optional)
+Air Filtration
B70DHV
TS-1127 08/21 Rev A
800.558.1711
2Installation & Operation Instructions 800.558.1711
Safety Instructions........................................................................................3
Dehumidier Set Up ......................................................................................4
Attaching Duct Collars..................................................................................5
Electrical Requirements................................................................................6
Drain Installation...........................................................................................7
Ducting to HVAC Systems ............................................................................9
Recommended HVAC System Installation............................................ 9
Fresh Air Ventilation....................................................................................10
Determine Ventilation Requirements ................................................... 11
Controls .......................................................................................................12
Wiring Controls.................................................................................... 12
Air Filtration.................................................................................................13
MERV Rating Chart ............................................................................. 14
Service .........................................................................................................15
Warranty ......................................................................................................17
TABLE OF CONTENTS
FOR REPAIR & TECH SUPPORT: 1-800-558-1711 (follow prompts)
Broan is committed to manufacturing quality products.
To maintain our standards, product specications may change without notice.
926 West State Street, Hartford, WI 53027
www.Broan-Nutone.com 800-558-1711
3
800.558.1711 Installation & Operation Instructions
SAFETY INSTRUCTIONS
WARNING!WARNING!
THIS SYMBOL MEANS IMPORTANT INSTRUCTIONS. FAILURE TO HEED THEM CAN
RESULT IN SERIOUS INJURY OR DEATH.
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 YOUR WHOLE HOUSE VENTILATING
DEHUMIDIFIER.
CAUTION!CAUTION!
THIS SYMBOL MEANS IMPORTANT INSTRUCTIONS. FAILURE TO HEED THEM CAN
RESULT IN INJURY OR MATERIAL PROPERTY DAMAGE.
Registrations
This Broan dehumidier conforms to unied standard UL 60335-2-40 and CSA Standard C22.2.60335-
2-40.
CAUTION!CAUTION!
READ ALL INSTRUCTIONS BEFORE BEGINNING INSTALLATION.
ALWAYS USE CAUTION AND WEAR CUT RESISTANT GLOVES WHEN HANDLING SHEET METAL.
IMPROPER INSTALLATION MAY CAUSE PROPERTY DAMAGE OR INJURY.
INSTALLATION, SERVICE, AND MAINTENANCE MUST BE PERFORMED BY A QUALIFIED SERVICE
TECHNICIAN.
DEHUMIDIFIER IS HEAVY. HANDLE WITH CARE AND FOLLOW INSTALLATION INSTRUCTIONS.
NEVER OPERATE A UNIT WITH A DAMAGED POWER CORD. IF THE POWER CORD IS
DAMAGED, IT MUST BE REPLACED BY THE MANUFACTURER, ITS SERVICE AGENT, OR A SIMILARLY
QUALIFIED PERSON IN ORDER TO AVOID A HAZARD.
THIS APPLIANCE IS NOT INTENDED FOR USE BY PERSONS (INCLUDING CHILDREN) WITH REDUCED
PHYSICAL, SENSORY OR MENTAL CAPABILITIES, OR LACK OF EXPERIENCE
OR KNOWLEDGE, UNLESS THEY HAVE BEEN GIVEN SUPERVISION OR INSTRUCTION
CONCERNING THE USE OF THE APPLIANCE BY A PERSON RESPONSIBLE FOR THEIR
SAFETY. CHILDREN SHOULD BE SUPERVISED TO ENSURE THAT THEY DO NOT PLAY WITH THE
APPLIANCE.
WARNING!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.
4Installation & Operation Instructions 800.558.1711
Important Precautions
• The device is designed to be installed indoors in a space that is protected from rain and ooding.
• Install the unit with enough space to access all sides for maintenance and service. The entire shell needs to be
removed in order to do repairs.
• Avoid directing the discharge air at people. The dehumidier should be used in the upright position.
• If used near a water source; be certain there is no chance the unit could fall into the water or get splashed and
that it is plugged into a dedicated circuit and Ground Fault Circuit Interrupter (GFCI) protected outlet.
• DO NOT use the dehumidier as a bench or table.
• DO NOT place the dehumidier 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 oat switch MUST be placed under the dehumidier if installed above a living area or above
an area where water leakage could cause damage.
Location Considerations
• Allow sucient clearance to handle the unit’s overall dimensions as well as the necessary return and supply
ductwork to the unit.
• Allow sucient clearance for lter removal and to prevent airow obstruction.
• Electrical service access will require the removal of the outside shell. Allow sucient clearance around the unit.
• Locate the dehumidier in an area where the cord’s lenght (9') easily reaches a 115 VAC electrical outlet with a
minimum of a 15 Amp circuit capacity.
• Locate the dehumidier in an area where eld wiring the control (low voltage) to the unit will be possible.
• It is recommended that a
backdraft damper be used in
the discharge duct of the
B70DHV, especially when
connecting to the supply
ducting system. The backdraft
damper prevents supply air
from counter owing through
the B70DHV when it is not
operating. The dehumidier’s
location should be chosen to
allow installation of this
accessory if necessary.
• The B70DHV may be
suspended with the hang kit
or a suitable alternative from
structural members,
ensuring the assembly
supports the dehumidier’s
base in its entirety. DO NOT
hang the B70DHV from its’
cabinet.
• Allow for proper drainage and
routing of needed drain pipes.
ELECTRICAL SERVICE
ACCESS THIS SIDE
6" MINIMUM CLEARANCE
FOR PROPER AIR FLOW
FILTER
9' POWER CORD
TOP VIEW
MINIMUM
CLEARANCE
FOR FILTER
(EITHER SIDE)
13"
B
B
RETURN AIR DUCT
SUPPLY AIR DUCT
A
B
C
A
DRAIN
ACCESS
DEHUMIDIFIER SET UP
5
800.558.1711 Installation & Operation Instructions
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 dehumidier can be rotated to allow for horizontal ow through or vertical ow through
of the supply air.
• Horizontal Flow Through
The unit ships congured for a horizontal ow through. An 8" diameter duct collar is attached to the unit.
• Vertical Flow Through
Remove the exhaust panel using a T20 torx bit. Rotate the panel so the exhaust collar is located on the top
of the unit. Align screw holes and snap the panel onto the base. Secure the exhaust panel to the base by
replacing the six screws.
OUTLET DUCT
COLLAR WITH
BACK DRAFT
DAMPER
RETURN AIR
INLET DUCT
COLLAR
FRESH AIR
INLET DUCT
COLLAR
RETURN AIR
INLET DUCT
COLLAR
FRESH AIR
INLET DUCT
COLLAR
Front View
Horizontal Flow Through
(End Discharge)
AIR FLOW
Rear View
Vertical Flow Through
(Top Discharge)
8" Return Air Inlet
8" Supply Air Outlet
A
B
A
AB
A
8" Return Air Inlet
8" Supply Air Outlet
A
B
Top View
Front View
A
Rear View
B
B
Air Flow Air Flow
B
ATTACHING DUCT COLLARS
OUTLET DUCT
COLLAR WITH
BACK DRAFT
DAMPER
RETURN AIR
INLET DUCT
COLLAR
FRESH AIR
INLET DUCT
COLLAR
RETURN AIR
INLET DUCT
COLLAR
FRESH AIR
INLET DUCT
COLLAR
Front View
Horizontal Flow Through
(End Discharge)
AIR FLOW
Rear View
Vertical Flow Through
(Top Discharge)
8" Return Air Inlet
8" Supply Air Outlet
A
B
A
AB
A
8" Return Air Inlet
8" Supply Air Outlet
A
B
Top View
Front View
A
Rear View
B
B
Air Flow Air Flow
B
6Installation & Operation Instructions 800.558.1711
The B70DHV plugs into a common grounded 115VAC outlet. The device draws 5.1 Amps at 80°F and 60%
RH. Locate the dehumidier 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. Consult local electrical codes for any further information.
There are multiple control devices that can be used with B70DHV. The controls are to be located
remotely from the dehumidier 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.
ELECTRICAL REQUIREMENTS
CAUTION!CAUTION!
DO NOT ALLOW THE 24V TERMINAL TO CONTACT THE COM/DMPR TERMINALS ON THE
B70DHV OR DAMAGE TO THE TRANSFORMER WILL RESULT.
Electrical Precautions
• Do not install the control where it may not accurately sense the relative humidity such as near HVAC
supply registers, near exterior doors, on an outside wall, near a window, or near a water source.
• The screw terminals on the B70DHV and the control are labeled to prevent confusion.
• Be sure to consult the electrical schematic in the CONTROLS Section (page 12) of this manual or
inside the access panel of the B70DHV before making control connections.
WARNING!WARNING!
THE REMOTE CONTROLS OF THE B70DHV ARE POWERED BY A LOW VOLTAGE CIRCUIT (24VAC)
AND MUST NEVER CONTACT OR BE CONNECTED TO A HIGH VOLTAGE CIRCUIT.
CAUTION!CAUTION!
SOME OF THE SCREWS TERMINALS ON THE B70DHV MAY NOT BE USED WITH
CERTAIN CONTROLS AND SHOULD BE LEFT UNCONNECTED.
Wiring Schematic
C
COMPRESSOR
COMPRESSOR
CAPACITOR
WHT-3
S
YEL-7
BLK-4
24VAC
LINE
COM
COM
WHT-2
TRANSFORMER
N.C.
N.O.
COM
COIL
BLK-13
FAN RELAY
GRN-1
BLK-6
BLK-11
DEFROST
SWITCH
COMPRESSOR
RELAY
DEHUMIDISTAT
R
FAN
BLU-9
GRN-15
BRN-14BLK-13
FAN
CAPACITOR
RED CIRCUIT IS 24VAC CONTROL CIRCUIT
4038488 Rev. B
GRN-25
RED-20
RED-8
RED-8
BLK-28
RED-20
BLK-28BLK-10BLK-11
BLK-5
BLU-19YEL-33
YEL-17
RED-23
YEL-16
RED-23
RED-24
CIRCUIT
BREAKER
24V
RED-21
COMDMPR
DEHU
BLU-18
FAN
RED-24
RED-21
BLK-10
BLK-12
BLK-12
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800.558.1711 Installation & Operation Instructions
The B70DHV generates condensate.
Place a secondary drain pan with a oat switch under the dehumidier if it is suspended above a nished
area or above an area where water leakage could cause damage.
A drain trap is required for the dehumidier to run properly. Install a 3/4" threaded male NPT adapter to the
drain pan. Install a drain pipe assembly utilizing 3/4" PVC pipe to transport the condensate to a drain. Pitch
of drain should be 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 oat switch.
The pump also contains a safety oat switch. The white leads from this switch extend from beneath the
pump cover. This switch should be installed in series with the eld wire that connects to the common lead
from the B70DHV to the control panel. If the pump fails, this switch opens the common control circuit and
stops water production before the reservoir overows. Contact a qualied electrician to install the safety oat
switch to the B70DHV dehumidier.
Note: An optional condensate pump kit can be purchased from a local dealer or online.
DRAIN INSTALLATION
Drain Installation
Front View
Secondary Drain Pan
Drain Port
Drain Trap
8Installation & Operation Instructions 800.558.1711
The recommended installation creates a separate return for the B70DHV in a central area of the
structure. Duct the supply of the unit to the air supply of the existing HVAC system. Connect an insulated
duct from outside to provide fresh make-up air (optional).
DUCTING TO HVAC SYSTEMS
CAUTION!CAUTION!
DO NOT CONNECT WITH A STATIC PRESSURE GREATER THAN OR EQUAL TO +0.5 WG.
CONTACT TECHNICAL SUPPORT AT (800) 558-1711 FOR ADDITIONAL DETAILS.
Ducting Considerations:
• All exible ducting connected to the B70DHV should be UL listed.
• A short piece of exible ducting on all B70DHV duct connections is recommended to reduce noise and
vibration transmitted to rigid ductwork in the structure.
• Use a minimum 8" diameter round or equivalent rectangular duct for total duct lengths of up to 25'. Use a
minimum 10" diameter or equivalent for longer lengths.
• Grills or diusers on the duct ends must not excessively restrict airow.
• A length of 8" or more of insulated ex duct or any other vibration isolating material on the outlet of the
B70DHV will reduce air noise from the blower.
• Eective dehumidication may require that ducting be branched to isolated, stagnant air ow areas. When
ducting to two or three areas, use 6" or larger diameter branch ducting. When ducting to four or more
areas, use 4"-6" or larger diameter branch ducting. Provisions must be made to provide airow from
supply locations to the central return location. Proper air distribution is important to ensure even humidity
control and heat distribution throughout the structure.
• DO NOT locate the return in a bathroom or a kitchen.
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800.558.1711 Installation & Operation Instructions
Recommended HVAC System Installation
DUCTING TO HVAC SYSTEMS
The recommended installation draws air from a dedicated indoor air return and ducts the supply of the
dehumidier to the air supply of the existing HVAC system. Utilize the optional fresh air ventilation duct to
provide outside air.
• 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. Select a return from a central location in the house that is always open to the rest
of the structure. DO NOT use a return from a room where doors are kept closed.
• DO NOT locate return in a bathroom or kitchen.
• Control should be located remotely from the dehumidier and placed in a central location.
• Please visit our website at www.Boran-NuTone.com for more installation options.
Santa Fe
Supply
Air Handler
HVAC Supply
Dedicated Santa Fe Ultra70 Return to A/C Supply
HVAC Return
Indoor Air
Return
Fresh Air Intake (Optional)
Motorized Damper Backdraft
Damper
Dedicated Return to HVAC Supply
Supply
10 Installation & Operation Instructions 800.558.1711
Fresh air ventilation is optional.
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.
• The 6" fresh air ventilation duct should tee into the 8" round collar on the front of the B70DHV.
• An insulated 6" diameter duct can provide up to 55 CFM of outside air.
• Performance of the B70DHV can be impacted by inside and outside air conditions.
• When a 6" motorized damper is used, a digital control is required.
• It may be necessary to use 8" duct work if additional fresh air is required.
• In cold climates or at times when the dew point is low, ventilation can be used to dehumidify the
structure, making the B70DHV capable of year-round drying.
FRESH AIR VENTILATION
B
Motorized Damper
6" Fresh Air Inlet
(Optional)
8" Return Air Inlet
8" Supply Air Outlet
A
B
C
Outdoor Air
90°F, 65%RH
Hot Climate
A
Mixed Air
Mixed Air
75°F
75°F
65%RH
65%RH
Mixed Air
75°F
65%RH
Indoor Air
70°F, 50%RH
B
C
Outlet Air
75°F, 65%RH
B
Motorized Damper
6" Fresh Air Inlet
(Optional)
8" Return Air Inlet
8" Supply Air Outlet
A
B
C
Outdoor Air
30°F, 65%RH
Cold Climate
A
Mixed Air
Mixed Air
59°F
59°F
51%RH
51%RH
Mixed Air
59°F
51%RH
Indoor Air
70°F, 50%RH
B
C
Outlet Air
59°F, 51%RH
Fresh Air Ventilation With Dehumidier O and Fan Only Operation
Outside air mixes with return air prior to beginning the dehumidication process. Outside
and inside temperature and relative humidity will impact the combined outlet air conditions.
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