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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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