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HR150B, HR200B PERFECT WINDOW™ FRESH AIR VENTILATION SYSTEMS
ADJUSTABLE
STALE AIR
RETURN
NOTES:
1.
VENTILATOR EXHAUSTS FROM KITCHEN AND/OR
BATHROOMS OR OTHER CENTRAL LOCATIONS
TO OUTDOORS.
VENTILATOR SUPPLIES OUTDOOR AIR DIRECTLY TO
2.
EACH BEDROOM, TO EACH FLOOR WITHOUT A
BEDROOM, AND TO THE PRINCIPAL LIVING AREAS.
Balancing Airflow
Balancing the airflow verifies that the Fresh Air Ventilation
System is delivering the intended airflow and energy
performance. Use the Airflow Balancing instructions in the
Installation section to check and balance the airflow.
Controls
Remote Override Switch Functions On/Off Control
If continuous ventilation is not required, an on/off control can
be used to activate the ventilator when it is switched to
Standby. Controls that can be used for this function include
dehumidistats, timers and wall switches. If moisture control in
bathrooms is a primary function of the system, a dehumidistat
can be used to switch the ventilator from a Low or Standby
setting to the High setting. Moisture removal throughout the
entire home can only be achieved when the outside air
contains less moisture than the inside air (typically during cold
weather conditions).
68-0285
ADJUSTABLE FRESH
AIR SUPPLY
FLEXIBLE INSULATED DUCTING
WITH A VAPOR BARRIER
Fig. 6. Independent ventilator installation.
Moisture Control
When a building is new, there is excess moisture in the wood,
plaster, cement and other construction materials. When the
new building is occupied, the activities of the occupants also
increase the moisture level. There can also be high levels of
formaldehyde and other chemicals that were used in the
building materials. Running the ventilation system on high
speed provides optimum indoor air pollutant reduction. High
speed also provides maximum moisture removal when the
outside air contains less moisture than the inside air. (Typically
during cold weather conditions.)
Operating Damper Frost Control
Some models have an electronically-controlled damper frost
control mechanism. When the outside temperature drops
below 27°F (-3°C), the defrost timer is activated. At the end of
the 17 minute run cycle, when the core can experience some
nominal frost buildup, the timer activates a motor-driven
damper door that simultaneously opens the defrost port and
closes off the supply air port. At the end of the 4.5 minute
defrost cycle, the damper operates in the opposite direction
and ventilation is resumed. The cycles continue until the
outdoor temperature rises above the defrost temperature.
6
ADJUSTABLE DAMPERS FOR
BALANCING AIR FLOW INTO
AND OUT OF THE HOUSE
FRESH AIR
SUPPLY HOOD
STALE AIR
EXHAUST HOOD
M22724
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