Broan B70DHV Installation instructions

1
800.558.1711 Installation & Operation Instructions
Serial Number
Install Date
Sold By
Installation & Operation Instructions
The B70DHV is a ventilating dehumidier that is
integrated into the heating and cooling system to
provide the ultimate in comfort, health and property
protection through:
+ Dehumidication
+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
Dehumidier 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 specications 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 dehumidier conforms to unied 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 dehumidier 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 dehumidier as a bench or table.
• DO NOT place the dehumidier 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 dehumidier if installed above a living area or above
an area where water leakage could cause damage.
Location Considerations
• Allow sucient clearance to handle the unit’s overall dimensions as well as the necessary return and supply
ductwork to the unit.
• Allow sucient clearance for lter removal and to prevent airow obstruction.
• Electrical service access will require the removal of the outside shell. Allow sucient clearance around the unit.
• Locate the dehumidier 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 dehumidier 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 dehumidier’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 dehumidier’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 dehumidier can be rotated to allow for horizontal ow through or vertical ow through
of the supply air.
• Horizontal Flow Through
The unit ships congured 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 dehumidier 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 dehumidier 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

7
800.558.1711 Installation & Operation Instructions
The B70DHV generates condensate.
Place a secondary drain pan with a oat switch under the dehumidier 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 dehumidier 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 overows. Contact a qualied electrician to install the safety oat
switch to the B70DHV dehumidier.
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 [phone] 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 diusers on the duct ends must not excessively restrict airow.
• 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.
• Eective dehumidication 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 airow 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.

9
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
dehumidier 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 dehumidier 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 Dehumidier O and Fan Only Operation
Outside air mixes with return air prior to beginning the dehumidication process. Outside
and inside temperature and relative humidity will impact the combined outlet air conditions.

11
800.558.1711 Installation & Operation Instructions
Option 1: Calculating Airflow Requirement Using ASHRAE 62.2-2016 Airflow Equation
ASHRAE Airow in CFM = [House Area in Sq.Ft. x 0.03] + [(Number of Bedrooms +1) x 7.5]
NOTE: Use ‘Number of Bedrooms + 1’ or ‘Number of Occupants’, whichever is larger.
Example 1: Number of Bedrooms + 1
1800 square foot house with 3 bedrooms, 4 occupants = [1800 X 0.03] + [(3+1) X 7.5] = 84 CFM
Example 2: Number of Occupants
1800 square foot house with 3 bedrooms, 5 occupants = [1800 X 0.03] + [5 X 7.5] = 91.5 CFM
Record the required CFM ____________
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 2: Calculating Airflow Requirement Using Table 4.1 from ASHRAE 62.2-2016
Table 4.1 from ASHRAE 62.2-2016
Record the required CFM ____________
Ventilation Air Requirements, CFM
Floor Area
(ft2)
< 500
501 - 1000
1001 - 1500
1501 - 2000
2001 - 2500
2501 - 3000
3001 - 3500
3501 - 4000
4001 - 4500
4501 - 5000
1
30
45
60
75
90
105
120
135
150
165
2
38
53
68
83
98
113
128
143
158
173
3
45
60
75
90
105
120
135
150
165
180
4
53
68
83
98
113
128
143
158
173
188
5
60
75
90
105
120
135
150
165
180
195
Number of Bedrooms

12 Installation & Operation Instructions 800.558.1711
A control can be used with the B70DHV. Broan oers 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. 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. If using the built-in dehumidistat to control the unit, locate the control in an area where it can accurately
sense the humidity of the area where humidity control is desired. If the B70DHV is located in the area where
humidity control is desired, consider using the built-in control. Adjust the humidity control so that the unit
maintains the desired level of humidity.
Note: The DEH 3000 is sold seperately and can be purchased online or through your local dealer. Other
thermostats are compatible with the B70DHV.
CONTROLS
CAUTION!CAUTION!
DO NOT ALLOW THE 24V TERMINAL FROM THE B70DHV TO CONTACT THE COM
TERMINAL ON THE B70DHV OR DAMAGE TO THE TRANSFORMERS WILL RESULT.
Circuit Breaker
To prevent damage to the 24 volt control transformer, the B70DHV comes with
a resettable circuit breaker. Check wiring for any electrical short and repair before
resetting breaker. Resetting the circuit breaker without correcting the electrical short may
result in transformer damage. Be sure to check the electrical schematic in this manual
or inside the access panel of the B70DHV before making any control connections.
The reset button for the circuit breaker can be found on the back of the unit.
Control Connections
The control and the B70DHV are labeled to prevent confusion. Depending on the
control, some of the screw terminals on the B70DHV may not be used. Be sure
to consult the electrical schematic in this manual or inside the access panel of the
B70DHV before making control connections.
Wiring Controls
Rear View
Circuit Breaker Reset Button
A low voltage control must be used with the B70DHV.
NOTE: 18 gauge wire needed between the B70DHV dehumidier and the external control.
COM 24VAC Power Transformer Neutral Side
FAN Fan Control
24V Transformer High Side
DEHU Dehumidication (Fan and Compressor) Control
DMPR 24VAC Power Transforme Neutral Side
* Spare Terminal (Open)
Terminal Block Control Operation:
Compressor ON / Fan ON Make contact between 24V and DEHU terminals
Compressor OFF / Fan ON Make contact between 24V and FAN terminals
Power HVAC Accessory Connect the accessory to the DMPR and 24V terminals
Between the COM lead and the 24V TERMINAL is a 40VA transformer. This low voltage power source
powers the relay coils which control the fan and compressors. This 24VAC transformer can also be
used to power HVAC accessories external to the dehumidier.

13
800.558.1711 Installation & Operation Instructions
The B70DHV is equipped with a MERV-13 (Dimensions: 0.75” x 9.00” x 11.38”) air lter. The lter should be
checked and replaced every three to six months. Operating the unit with a dirty lter will reduce dehumidier
capacity and eciency.
DO NOT operate the unit without the recommended lter. Filter non-compliance voids the product warranty.
AIR FILTRATION
Changing the Filter
For greatest ltration and eciency of the B70DHV, it is recommended the air lter be replaced
every three to six months with a MERV-13 rated lter.
Step 1: Remove the lter door from one side of the B70DHV by pushing the snap button in and
gently pulling the door away from the unit. Then pull up to disengange the door from the slot.
Step 2: Remove the lter by gently pulling straight out of the unit. Insert new lter by gently pushing
it straight into the unit. Make sure the AIR FLOW arrow on the lter is pointing into the unit.
Step 3: Replace lter
door ensuring the
opening is fully covered.
Side View
Return
Filter
Filter
Top View
Side View
Magnetic Strip
Optional Fresh
Air Intake
Return
Supply
Top View
Supply
Top View
Filter
Fresh Air
Intake
(Optional)
Filter
Return Filter Return
To Remove,
pull out straight.
Side View
Filter Door
Return
Front View
Filter Door
Front View
Side View
Filter Door
Return
Front View
Filter Door
Front View
Replace
Filter Door
Filter
Top View
Side View
Magnetic Strip
Optional Fresh
Air Intake
Return
Supply
Top View
Supply
Top View
Filter
Fresh Air
Intake
(Optional)
Filter
Return Filter Return
To Replace,
push in straight.
Front View Front View
CAUTION!CAUTION!
MAKE SURE UNIT IS OFF BEFORE CHANGING THE FILTER.
Side View
Filter Door
Return
Front View
Filter Door
Front View

14 Installation & Operation Instructions 800.558.1711
AIR FILTRATION
Standard 52.5 Minimum
Efficiency Reporting
Value
Dust Spot
Efficiency Arrestance
Typical Controlled
Contaminant
Typical Applications and
Limitations Typical Air Filter/Cleaner Ty pe
20 n/a n/a < 0.30 pm Particle Size Cleanrooms
>99.999% eff. On .10-.20 pm
Particles
19 n/a n/a Virus (unattached) Radioactive Materials
p
Particles
18 n/a n/a Carbon Dust Pharmaceutical Man.
p
Particulates
17 n/a n/a All Combustion Smoke Carcinogenetic Materials >99.97% eff. On .30 pm Particles
16 n/a n/a .30-1.0 pm Particle Size General Surgery Bag Filter - Nonsupported
15 >95% n/a All Bacteria Hospital Inpatient Caremicrofine fiberglass or
14 90-95% >98% Most Tobacco Smoke Smoking Lounges
synthetic media, 12-36 in. deep,
6-12 pockets.
13 89-90% >98% Proplet Nuceli (Sneeze) Superior Commercial Buildings
Box Filter - Rigid Style Cartridge
Filters 6 to 12" deep may use
lofted or paper media.
12 70-75% >95% 1.0-3.0 pm Particle Size Superior Residential Bag Filter - Nonsupported
Legionella microfine fiberglass or
1160-65% >95% Humidifier Dust Better Commercial Buildings
synthetic media, 12-36 in. deep,
6-12 pockets.
Lead Dust
10 50-55% >95% Milled Flour
Box Filter - Rigid Style Cartridge
Filters 6 to 12" deep may use
lofted or paper media.
Auto Emissions Hospital Laboratories
940-45% >90% Welding Fumes
830-35% >90% 3.0-10.0 pm Particle Size Commercial Buildings
Pleated Filters-Disposable,
extended surface area, thick with
Mold Spores
cotton-polyester blend media,
cardboard frame.
725-30% >90% Hair Spray Better Residential
Fabric Protector
Cartridge Filters-Graded density
viscous coated cube or pocket
filters, synthetic media.
6<20% 85-90% Dusting Aids Industrial Workplace
Cement Dust
Throwaway - Disposable
synthetic panel filter.
5<20% 80-85% Pudding Mix Paint Booth Inlet
4<20% 75-80% >10.0 pm Particle SizeMinimal Filtration
Throwaway - Disposable
fiberglass or synthetic panel filter.
Pollen
3<20% 70-75% Dust Mites Residential Washable - Aluminum Mesh.
Sanding Dust
2<20% 65-70% Spray Paint Dust
Textile Fibers Window A/C Units
Electrostatic-Self charging
woven panel filter.
1<20% <65% Carpet Fibers
MERV Rating Chart
Table Data Source: United States Environmental Protection Agency
Standard 52.5 Minimum
Efficiency Reporting
Value
Dust Spot
Efficiency Arrestance
Typical Controlled
Contaminant
Typical Applications and
Limitations Typical Air Filter/Cleaner Type

15
800.558.1711 Installation & Operation Instructions
SERVICE
Symptom Possible Reason Troubleshooting Procedure
CAUTION!CAUTION!
TROUBLESHOOTING SHOULD BE PERFORMED BY A QUALIFIED HVAC TECHNICIAN.
Troubleshooting
Troubleshooting Procedure for Control
Related Issues
This method of diagnosis will test the 3 main
components of the control circuit individually to
indicate any potential problems. This is to be used
when the control will not activate the main unit.
1. Detach eld control wiring connections from
the terminals on the main unit.
2. Connect the 24V and FAN terminals
together; only the fan should run.
Disconnect the terminals.
3. Connect the 24V and DEHU terminals
together; fan and compressor should run.
Disconnect the terminals.
4. If this test works, the main unit is working
correctly from a control standpoint.
5. Reconnect eld control wiring to the terminals
on the main unit.
6. Remove the control panel cover and detach
the eld wiring from the control connections.
7. Connect the 24V and FAN terminals together;
only the fan should run. Disconnect the terminals.
8. Connect the 24V and DEHU terminals
together; fan and compressor should run.
Disconnect the terminals.
9. If this test works, then the eld control wiring
is ok.
10. If the problem persists, then the control is
most likely faulty.
WARNING!WARNING!
ELECTRICAL SHOCK HAZARD:
ELECTRICAL POWER MUST BE PRESENT
TO PERFORM SOME TESTS. THESE TESTS
SHOULD BE PERFORMED BY A QUALIFIED
SERVICE PERSON.
Neither fan nor
compressor
running.
Dehumidication
is being called for.
Compressor is
not running.
Dehumidication
is being called for.
Fan is running.
1. Defective compressor
run capacitor.
2. Loose connection in
compressor circuit.
3. Defective compressor
overload.
4. Defective compressor.
5. Defrost thermostat open.
Compressor
cycles on and o.
Dehumidication is
being called for.
1. Low ambient
temperature and/or
humidity causing unit
to cycle through
defrost mode.
2. Defective compressor
overload.
3. Defective compressor.
4. Defrost thermostat
defective.
5. Dirty air lter(s) or air
ow restricted.
6. Defective fan or relay.
1. Dehumidier unplugged
or no power to outlet.
2. Humidity control set
too high.
3. Loose connection in
internal or control wiring.
4. Defective compressor
relay.
5. Defective control
transformer.
Fan is not running.
Dehumidication
or fan is being
called for.
1. Loose connection in
fan circuit.
2. Obstruction prevents
fan impeller rotation.
3. Defective fan.
4. Defective fan relay.

16 Installation & Operation Instructions 800.558.1711
SERVICE
Troubleshooting (Continued)
Symptom Possible Reason Troubleshooting Procedure
Troubleshooting Procedure for Performance
Related Issues
This method of diagnosis is used to function
check the internal components in the dehumidi-
er. This is to be used when a performance issue
is suspected.
1. Set the humidity controller all the way to the
most humid setting or o position – Did the
unit shut o?
2. If yes, turn the fan setting to the ON position –
does the fan start?
3. If fan starts, leave in the fan ON position and
set the humidity all the way to driest setting.
May have to wait 5 minutes for the compressor
to start.
4. Listen for a distinct buzzing/humming sound
of a compressor starting up – do you hear this
noise?
5. If compressor is running and continues to run,
after about 15 minutes you should feel a slight
increase in air temperature being discharged
out of the discharge air side of the unit.
6. If so, depending on your environmental
conditions (temp/Rh%), you should see some
water production out of the hose within
30 minutes or so. (Note: If the room
temperature is 55 degrees or below and/or
in area of low relative humidity, the
dehumidier will produce little to no water.)
7. Collecting the water removed in a 24 hour period
will give a measurement of performance.
WARNING!WARNING!
ELECTRICAL SHOCK HAZARD:
ELECTRICAL POWER MUST BE PRESENT
TO PERFORM SOME TESTS. THESE TESTS
SHOULD BE PERFORMED BY A QUALIFIED
SERVICE PERSON.
Low dehumidication
capacity (evaporator
is frosted
continuously).
Dehumidication is
being called for.
1. Defrost thermostat loose
or defective.
2. Low refrigerant charge.
3. Dirty air lter(s) or air ow
restricted.
4. Excessively restrictive
ducting connected to unit.
No ventilation.
Ventilation is being
called for.
1. Loose connection in
ventilation control circuit.
2. Loose connection in
damper power circuit.
3. Defective fresh air
damper.
Dehumidier
removes some
water, but not as
much as expected.
1. Air temperature and/or
humidity have dropped.
2. Humidity meter and or
thermometer used are
out of calibration.
3. Unit has entered defrost
cycle.
4. Dirty air lter(s) or air ow
is restricted.
5. Defective defrost
thermostat.
6. Low refrigerant charge.
7. Air leak such as loose
cover or ducting leaks.
8. Defective compressor.
9. Restrictive ducting.
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.
If the refrigerant charge is lost due to service or a leak, the leak should be repaired and a new charge must
be accurately weighed in. If any of the old charge is left in the system, it must be recovered before weighing
in the new charge. Refer to the unit nameplate for the correct charge weight and refrigerant type.
Refrigerant Charging

17
800.558.1711 Installation & Operation Instructions
WARRANTY
Limited Warranty. Broan, LLC (“Broan”) warrants as follows: (i) the Broan B70DHV dehumidifier (“Product”) will be free of
material defects in workmanship or materials for a period of two (2) years (“Two-Year Warranty”) following the date of initial
purchase of such Product by an original customer purchasing from Broan or an authorized reseller (“Customer”); and (ii) the
Product’s components will be free of material defects in workmanship or materials for a period of six (6) years following the
date of initial purchase of such Product by a Customer.
Limitation of Remedies. CUSTOMER’S SOLE AND EXCLUSIVE REMEDY UNDER THE ABOVE LIMITED WARRANTY
AND BROAN’S ENTIRE LIABILITY THEREUNDER, SHALL BE, AT THE SOLE OPTION OF BROAN, REPLACEMENT OR
REPAIR OF SUCH PRODUCT OR ITS COMPONENTS (“COMPONENTS”) BY BROAN OR BROAN’S AGENTS ONLY.
REFRIGERANT, PIPING, SUPPLIES, TRANSPORTATION COSTS, LABOR COSTS INCURRED IN REPAIR OR REPLACEMENT
OF SUCH COMPONENTS ARE NOT INCLUDED. THIS DISCLAIMER AND EXCLUSION SHALL APPLY EVEN IF THE
EXPRESS WARRANTY AND LIMITED REMEDY SET FORTH HEREIN FAILS OF ITS ESSENTIAL PURPOSE. CUSTOMER
ACKNOWLEDGES THAT NO REPRESENTATIVE OF BROAN OR OF ITS AFFILIATES OR RESELLERS IS AUTHORIZED TO
MAKE ANY REPRESENTATION OR WARRANTY ON BEHALF OF BROAN OR ANY OF ITS AFFILIATES OR RESELLERS THAT
IS NOT IN THIS AGREEMENT. Notwithstanding the above, during the term of the Two-Year Warranty only, Broan will provide,
free of charge to Customer, all Components and labor (except costs related to removal and installation of Product) required to
fulfill its obligations under such Two-Year Warranty.
Disclaimer of Warranties. EXCEPT FOR ABOVE LIMITED WARRANTY, WHICH IS THE SOLE AND EXCLUSIVE WARRANTY
PROVIDED WITH RESPECT TO THE PRODUCT AND ITS COMPONENTS, BROAN HEREBY DISCLAIMS ALL EXPRESS AND
IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE.
Warranty Limitations. The foregoing limited warranty extends only to a Customer and shall be null and void upon attempted
assignment or transfer. A “defect” under the terms of the limited warranty shall not include problems resulting from Customer’s
or Customer’s employees’, agents’, invitees’ or a third party’s misuse, improper installation, improper design of any system in
which the Product is included, abuse, lack of normal care, failure to follow written instructions, tampering, improper repair, or
freezing, corrosion, acts of nature or other causes not arising out of defects in Broan’s workmanship or material. If a Product or
Component is replaced while under warranty, the applicable limited warranty period shall not be extended beyond the original
warranty time period. The limited warranty does not cover any costs related to changes to a Product or Component that may be
required by any codes, laws, or regulations that may become effective after initial purchase of the Product by Customer.
Customer Responsibilities. As a further condition to obtaining warranty coverage hereunder, the Customer must send a valid
warranty claim to Broan such that Broan receives such claim prior to the end of the applicable warranty period. Broan shall
have no obligation hereunder with respect to any claim received by Broan after the expiration of the applicable warranty
period. As a further condition to obtaining warranty coverage hereunder, the Customer must present forms of invoices
evidencing proof of purchase of a Product. If such invoices do not clearly indicate the date of initial purchase by a Customer,
the applicable Product’s date of manufacture will be used instead of the date of initial purchase for the purpose of calculating
the commencement of the applicable warranty period. Warranty service must be performed by Broan or a servicer authorized
by Broan. In order to obtain warranty service, the Customer should call Broan at 1-800-558-1711 and ask for the Broan
Products Service Department, which will then arrange for applicable warranty service. Warranty service will be performed during
customary, daytime working hours. If the Product must be shipped for service, Customer shall be solely responsible for properly
packaging the Product, for all freight charges, and for all risk of loss associated with shipment.
Limitation of Liability. IN NO EVENT SHALL BROAN, IN CONNECTION WITH THE DESIGN, SALE, INSTALLATION, USE,
REPAIR, REPLACEMENT OR PERFORMANCE OF ANY PRODUCT, COMPONENT, PART THEREOF OR WRITTEN MATERIAL
PROVIDED THEREWITH, BE LIABLE, TO THE EXTENT ALLOWED UNDER APPLICABLE LAW, UNDER ANY LEGAL THEORY
FOR ANY SPECIAL, DIRECT, INDIRECT, COLLATERAL OR CONSEQUENTIAL DAMAGES OF ANY KIND. NOTWITHSTANDING
THE ABOVE LIMITATIONS AND WARRANTIES, THE SOLE AND EXCLUSIVE LIABILITY OF BROAN, REGARDLESS OF THE
NATURE OR THEORY OF THE CLAIM, SHALL UNDER NO CIRCUMSTANCES EXCEED THE PURCHASE PRICE OF THE
PRODUCT, COMPONENT OR PART UPON WHICH THE CLAIM IS PREMISED.
Applicable Law and Venue. ANY ARBITRATION, ENFORCEMENT OF AN ARBITRATION OR LITIGATION RELATED TO THE
PRODUCT WILL BE BROUGHT EXCLUSIVELY IN DANE COUNTY, WISCONSIN, AND CUSTOMER CONSENTS TO THE
JURISDICTION OF THE FEDERAL AND STATE COURTS LOCATED THEREIN, SUBMITS TO THE JURISDICTION THEREOF
AND WAIVES THE RIGHT TO CHANGE VENUE. CUSTOMER FURTHER CONSENTS TO THE EXERCISE OF PERSONAL
JURISDICTION BY ANY SUCH COURT WITH RESPECT TO ANY SUCH PROCEEDING.
Miscellaneous. If any term or condition of this Limited Warranty is found by a court of competent jurisdiction to be invalid, illegal
or otherwise unenforceable, the same shall not affect the other terms or conditions hereof or thereof or the whole of this 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.