Troubleshooting guide

10
An HRV can also be installed to work in conjunction with a
forced-air furnace system, as illustrated in Figure 3. In this
case, the HRV’s fresh-air duct is connected to the furnace’s
main return air duct. The fresh air enters the furnace and is
distributed throughout the house using the regular system
of ductwork. In such a configuration, the furnace blower
should run continuously at low speed when the HRV is
operating to ensure a regular flow of fresh air throughout
the house. The furnace blower can also be wired to operate
at the normal higher speed for heating and cooling.
However, this higher speed can be noisy and may make the
rooms feel cool if used to distribute ventilation air continu-
ously. Separate, additional ductwork may be needed to
transfer stale air from the damp rooms to the HRV
(as shown in Figure 3).
FIGURE
3
An HRV installed in conjunction with a
forced-air furnace system
Kitchen
Furnace
Heat
transfer
Return air
*
Fresh air
Exhaust air
Living room
Bedroom
Stale air
exhaust
ducts
Furnace
distribution
ducts
Furnace main
return air duct
Laundry Bathroom
*Furnace return air may come from more than one location.
00-211 english booklet 3/20/03 12:00 pm Page 10