Page 15
Healthy Climate
®
HRV/ERV Ventilators
Installation MethodsPartially Dedicated
Partially Dedicated Installation
The partially dedicated installation draws stale air from
specific points in the house and introduces an equal
amount of fresh air into the cold air return (see figures 10
and 11).
Figure 10. Partially Dedicated System
Stale air ducts should be installed in areas of the home
where the poorest indoor air quality exists (bathrooms and
kitchen). Each location with a stale air duct should have a
timer to initiate high−speed ventilation. (Refer to Optional
Timers on page 12.)
The air handler/furnace blower should be running when the
HRV is operating to evenly distribute the fresh air through-
out the house. (Refer to Interlocking the HRV to an Air
Handler/Furnace Blower on page 24.)
Key points
S
The HRV
/
ERV must be balanced.
S
It is recommended that the furnace blower run continu-
ously or HRV
/
ERV operation be interlocked with the
furnace blower to evenly distribute the fresh air
throughout the house.
S
The duct configuration may change depending on the
HRV
/
ERV model. See specifications for your unit.
S
Check local codes and authority having jurisdiction for
acceptance.
Installation Notes
S
See unit specifications for exact port locations.
S
Unit is normally balanced on HIGH speed with the furnace blower ON.
S
Weatherhood arrangement is for drawing purposes only. Six feet (2m) minimum
separation is recommended. The weatherhood must be 18" (460mm) above grade minimum.
S
The airflow must be confirmed on site using the balancing procedures found in this manual.
Forced Air
Furnace
Cool Air
Return
Dampers for
Balancing
Airflows
Return Air
Outdoors
EXHAUST AIR
from various parts of home.
(i.e. bathrooms, kitchens, utility areas)
36"
(914mm) Min.
Recommended
Leaf Hinge
Install the Backdraft Damper with the leaf hinge vertical.
The damper is installed on the Stale Air to Outside Collar".
5" (127 mm) Backdraft Damper (Y3728)
6" (152 mm) Backdraft Damper (Y3727)
Spring−Loaded
Backdraft
Damper
Figure 11. Direct Connection of Supply Air Stream to the Furnace Cold Air Return
(Stale air drawn from key areas of home)
