S&P HR100V Installation And Wiring Instructions - page 5

Page 5

  3. TYPES OF INSTALLATIONS 

INDEPENDENT 

SYSTEM 

INSTALLATION

This application uses a devoted 

duct system for the supply 

and the exhausting of stale air 

accumulated in the home. 

It is recommended to install 

fresh air grilles in all bedrooms 

and living areas.  Exhaust the 

stale air from the bathroom, 

kitchen and laundry room. (see 

figure 3.1)

IMPORTANT:

 For optimal 

performance of your HRV, the 

installation of an optional 6” round 

galvanized backdraft damper is 

required on the fresh air to home 

duct work.

figure 3.1

EXHAUST AT THE 

SOURCE AND 

SUPPLY IN THE 

RETURN

This application uses a devoted 

duct system for the exhausting 

of stale air accumulated in the 

home. The fresh air is dumped 

into the return air duct and is 

distributed thru the home by 

the existing supply air ductwork 

of  the  forced  air  system.  (see 

figure 3.2)

Make sure when using this 

application that your fresh air 

duct connection to the forced air 

system return air duct is not less 

than  10ft  (3  m)  upstream  of  the 

return plenum connection to the 

forced air system. Check with 

your local code or the forced air 

system’s  manufacturer.  The  HRV 

and forced air system must be 

in continuous mode, to achieve 

maximum comfort and to avoid 

cross-contamination. 

NOTE TO INSTALLER: 

Dwellings with multiple forced 

air systems requires one HRV 

per system.

Insure the unit runs in 

conjunction with forced air 

system (Ref. wiring diagram for 

furnace interlock)

figure 3.2

* For minimum distance between return and forced 

air system, check with your local building codes 

and forced air system manufacturer.

From Bathroom  

or Kitchen

To living space

HRV

Forced  Air System

6'

(1.83 m)

A

B

18" (457 mm)

A+B=NOT LESS THAN 10FT (3 M)*

IMPORTANT:

  The duct bringing outdoor air to the 

return air plenum must be equipped with a manual 

dumper to balance the outdoor airflow.

IMPORTANT: For optimal performance of your HRV, the installation of an optional 6" round galvanized backdraft 

damper is required on the fresh air to home duct work. When performing duct connections, always use approved 

tools and material. Also use steel duct connections for these type of installs.