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132104_002 Revised 9/2018 Page 2

Location of the Unit

Select a location so that:

• The fresh air intake vent from the outside is placed a

minimum of ten feet from any other exhaust vent, and is at

least 30” long.

• The two ducts to the outside are as short and straight as

possible for the best performance from the system. Shorter

duct runs help assure the system is balanced: the amount of

air brought in is equal to the amount of air exhausted.

• The door can be opened to allow cleaning the core and

lters. Provide clearance at front of unit for service

access to the blowers, lters and energy exchange core.

(24” recommended/12” minimum.)

• The exhaust outlet and fresh air inlet on the outside of the

building should be at least ten feet apart to avoid cross-

contamination. The exhaust duct should be about the same

length as the fresh air duct.

• The exhaust outlet should not dump air into an enclosed

space or into any other structure.

• Do not install the exhaust outlet and fresh air inlet through

the roof or roof sot. If these are the only available options

call S&P technical support for help.

The preferred mounting location for the unit is on a concrete

foundation wall because the foundation wall isolates any blower

vibration.

If a basement area is not available or practical, use other

mechanical room space such as a closet, garage, storage, or

accessible attic or crawl space.

NOTE: If you wish to install the unit in an attic or other

unconditioned space, you must insulate all of the unit’s ductwork

that is located in the attic. Use at least R-6 insulation.

RA: Room Air

OA: Outside Air

FA: Fresh Air

Inside Ductwork System

For houses without ducted heating or cooling systems – see

Schematic (B):

In most houses one or two fresh air grilles in a central part of

the house provide eective distribution of the fresh air into the

home, particularly when the stale exhaust air is picked up at

several points. Because the fresh air is usually somewhat cooler

than the household air, the fresh air supply grilles should be

located in a trac area like a hallway or stairway rather than in

a sitting area. If you want to get fresh air into specic rooms with

high occupancy, you can split up the fresh air supply.

For houses with forced-air heating and cooling systems – see

Schematics (A), (C) and (D):

Most units are installed with the fresh air duct connected directly

to a return duct for the main heating and cooling system. Be

careful to connect the fresh air duct at least three feet from the

return plenum to minimize suction from the furnace blower. A

connection closer to the furnace may result in unbalanced ow

and associated problems.

For installations that collect stale air from specic rooms in

the home – for example, Schematics (A) and (B):

Locate stale air return grilles (RA) in rooms where moisture and

odors are generated: bathrooms, the kitchen, and perhaps other

areas where contaminants are generated such as in the home

workshop. Return grilles in these other areas may be dampered

so that they can be shut o when not in use. A central location

such as a hallway is also acceptable but won’t clear humidity and

odors from baths and kitchens as rapidly. Locate stale air return

grilles (RA) near the ceiling on inside walls. Stale air returns are

usually easiest to install in interior partitions.

Stale Air Return Grille Sizes

Bathroom 4” X 10” or 6” X 10” - 40 to 60 sq. in.

Kitchen 6” X 10” or 60 sq. in.

www.renewaire.com (800) 627- 4499 support@renewaire.com

(A) (B)

EA: Exhaust Air

SA: Supply Air (furnace)

*TR90 only

Separate Room Air Pick-up -

Fresh Air to Furnace Return Air Trunkline

Separate Return Air and Fresh Air Supply

Furnace Return Air Back into Return Air

Furnace Return Air Back into Supply Air

Brand	S&P
Model	TR90 Series
Category	Controller
Language	English

S&P TR90 Series User Manual

Table of Contents

Questions and Answers:

S&P TR90 Series Specifications

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