Tradewinds RNC10, RNC95, RNC20 Installation Instructions Manual

Package 1 of 1 contains:

1 - Assembled ventilator

1 - Bag assembly containing:

2 - Drain spout assemblies (HRV units only)

4 - Hanging straps

1 - Installation manual

Installation Tools

• tin snips • large zip ties

• assorted screw drivers • fabric flexible duct

• electric drill - class I rated

• hammer • mastic tape

• wire strippers • alum. foil duct tape

• knife • zip ties

• caulking gun • 1/2” I.D. drain hose

• smoke pencil

Balancing Tools

• Pitot Tube Balancing Kit [Case, 8 ft. vinyl tubing, Pitot
tube, magnehelic gauge (0 - 0.25”), and mounting plate]

• Pitot Tube with instructions and Digital Manometer (with
resolution of 0 - 0.25” - must read to 1/100ths of an
inch)

Optional Accessories

• 20 Minute Fan Timer

• Wall Mounted Dehumidistat

• Weather hood Kit

• Round Diffuser

4” (100mm)

6” (150mm)

8” (200mm)

• Kitchen Grille

- may be required by code for kitchen applications

- contains removable grease filter

Heat Recovery Ventilators (HRV) are designed to provide
fresh air while exhausting an equal amount of stale air.

The HRV is equipped with an aluminum core. The device
uses the stale air that is being exhausted to condition the
fresh air as it is being brought in.

These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
who have jurisdiction before installation.

Shipping and Packaging List ............................................1

Required Tools .................................................................1

Application ........................................................................1

General .............................................................................1

Engineering Data...........................................................2-4

RNC95 Specifications and Airflow ....................................5

Clearances & Requirements.............................................6

Installation .....................................................................6-9

Application Illustrations..............................................10-12

Electrical ........................................................................13

Remote Control Devices.................................................14

Wiring the Controls .........................................................15

Operation ........................................................................16

Wiring Diagrams .............................................................17

Interlocking HRV to Furnace...........................................18

Air Flow Balancing.....................................................20-21

Troubleshooting ..............................................................22

Maintenance ..................................................................23

Shipping and Packing List

Application

General

Table of Contents

Required Tools

* LEAVE FOR HOMEOWNER

NOTE: Due to ongoing research and product development, specifications,

ratings and dimensions are subject to change without notice.

TW-01

0307

HEAT RECOVERY VENTILATOR

MODELS RNC95/RNC10/RNC20

TM

HEAT RECOVERY VENTILATOR

INSTALLATION INSTRUCTION FOR HEAT RECOVERY VENTILATOR (HRV)

2

THERMALLY CONDUCTIVE, PATENTED ALUMINUM CORE

The cross-flow heat recovery core transfers heat between the two air streams.
It is easily removed for cleaning or service.

MOTORS AND BLOWERS

Each air stream has one centrifugal blower driven by a common PSC motor.

FILTERS

Washable air filters in exhaust and supply air streams.

MOUNTING THE HRV

Four threaded inserts at corners of case designed to accept four PVC reinforced polyester straps
that are supplied with the unit.

DEFROST

Recirculating defrost system.

CASE

Twenty gauge prepainted galvanized steel (G60) for superior corrosion resistance. Insulated to
prevent exterior condensation. Drain connections two - 1/2" (12mm) OD.

WEIGHT

52 lbs. (23.6 kg)

SHIPPING WEIGHT

56 lbs. (25.4 kg)

CONTROLS - HRV System Control

HRV defaults to LOW SPEED when plugged in. HIGH SPEED option is accessible by connecting
remote controls to designated terminals inside electrical box of HRV.

Standard LOW SPEED SETTING can be increased to medium low.
Off (Standby)/Low or OFF/HIGH speed operation is also available.

OPTIONAL ACCESSORIES

99-101 Crank Timer
99-116 Dehumidistat Ventilation Control - Dehumidistat with ON/OFF
99-130 Dehumidistat Control - Dehumidistat
99-132 20 Minute Fan Timer - (3 wire) 20 gauge wire (min.) 100’ length (max.)
99-186 Weatherhoods, Two - 6" (150mm) c/w 1/4" (6mm) mesh screen
99-2040 20/40 ON/OFF Dehumidistat
99-RECIRC Recirculation Control
All units conform to CSA and UL standards.All units conform to CSA and UL standards.

WARRANTY

Units carry a 15 year warranty on the heat recovery core and a five year replacement
parts warranty.

TW-RNC95

0107

Engineering Data - HRV RNC95

Dimensions RNC95 inches (mm)

HEAT RECOVERY VENTILATOR

Date: ___________________________________________

Tag: _____________________Qty:___________________

Project: _________________________________________

Engineer: _______________________________________

Contractor: ______________________________________

Supplier: ________________________________________

Quote#: _________________________________________

Submitted by: ____________________________________

*Sensible Efficiency - thermal **Latent Efficiency - moisture

Note: Effectiveness - based on temp. differential between the 2 airstreams
Efficiency - takes into account all power inputs

Performance (HVI certified)

Net supply air flow in cfm (L/s) against external static pressure

E.S.P

(external static pressure) [cfm (L/s)]

@ 0.1" (25 Pa) 76 (36)

@ 0.2" (50 Pa) 73 (34)

@ 0.3" (75 Pa) 70 (33)

@ 0.4" (100 Pa) 66 (31)

@ 0.5" (125 Pa) 60 (29)

Max. Temperature Recovery 88%

Sensible Effectiveness
@ 60 cfm (28 L/s) 32°F (0°C) 88%

*Sensible Efficiency
@ 60 cfm (28 L/s) 32°F (0°C) 75%

*Sensible Efficiency
@ 62 cfm (29 L/s) -13°F (-25°C) 68%

VAC @ 60HZ 120

WATTS / Low speed. 60

WATTS / High speed 150

Amp rating 0.9

5 - High Speed

TM

HEAT RECOVERY VENTILATOR

24.5"
(622 mm)

18.5"

(470 mm)

Removable

Heat Recovery

Core

Drain Pan

Drain spout

FRONT TOP

knockout for

side mounting of

EXHAUST return port

6" round collar

converted to oval

minimum

18 inches (459 mm)

required for

service access

SIDE

Hanging

straps (4)

16"

(406 mm)

Threaded
inserts (4)
at corners

SUPPLY

Fresh air

from outside

5" round collar

SUPPLY

Fresh air

to building

6" round

(conv. to oval)

collar

80

5

75

70

65

Air Flow (c fm)

60

55

50

0 0.1 0.2 0.3 0.4 0.5 0.6

18.5"

(470 mm)

Static Pressure (in w.g.)

EXHAUST

Stale Air

to outside

5" round collar

EXHAUST

Return air

from building

Choice of port location

Knockouts on top and
side of unit (use 1 only)
6" round (conv. to oval)

collar supplied

3

THERMALLY CONDUCTIVE, PATENTED ALUMINUM CORE

The cross-flow heat recovery core transfers heat between the two air streams. It is easily removed
for cleaning or service.

MOTORS AND BLOWERS

Each air stream has one centrifugal blower driven by a common PSC motor.

FILTERS

Washable air filters in exhaust and supply air streams.

MOUNTING THE HRV

Four threaded inserts at corners of case designed to accept four PVC reinforced polyester straps
that are supplied with the unit.

DEFROST

Damper defrost system; defrosts automatically as the outdoor temperature falls.

CASE

Twenty gauge prepainted galvanized steel (G60) for superior corrosion resistance. Insulated to
prevent exterior condensation. Drain connections two - 1/2" (12mm) OD.

WEIGHT

63 lbs. (28.7 kg)

SHIPPING WEIGHT

67 lbs. (30.4 kg)

CONTROLS - HRV System Control

HRV defaults to LOW SPEED when plugged in. HIGH SPEED option is accessible by connecting
remote controls to designated terminals inside electrical box of HRV.

Standard LOW SPEED SETTING can be increased to medium low.
Off (Standby)/Low or OFF/HIGH speed operation is also available.

OPTIONAL ACCESSORIES

99-101 Crank Timer
99-116 Dehumidistat Ventilation Control - Dehumidistat with ON/OFF
99-130 Dehumidistat Control - Dehumidistat
99-132 20 Minute Fan Timer - (3 wire) 20 gauge wire (min.) 100’ length (max.)
99-186 Weatherhoods, Two - 6" (150mm) c/w 1/4" (6mm) mesh screen
99-2040 20/40 ON/OFF Dehumidistat
All units conform to CSA and UL standards.

WARRANTY

Units carry a 15 year warranty on the heat recovery core and a five year replacement
parts warranty.

0107

*Sensible Efficiency - thermal **Latent Efficiency - moisture

Note: Effectiveness - based on temp. differential between the 2 airstreams
Efficiency - takes into account all power inputs

Engineering Data - HRV RNC10

Dimensions HRV inches (mm)

HEAT RECOVERY VENTILATOR

Date: ___________________________________________

Tag: _____________________Qty:___________________

Project: _________________________________________

Engineer: _______________________________________

Contractor: ______________________________________

Supplier: ________________________________________

Quote#: _________________________________________

Submitted by: ____________________________________

Performance (HVI certified)

Net supply air flow in cfm (L/s) against external static pressure

E.S.P

(external static pressure) [cfm (L/s)]

@ 0.1" (25 Pa) 177 (83)

@ 0.2" (50 Pa) 164 (77)

@ 0.3" (75 Pa) 156 (73)

@ 0.4" (100 Pa) 143 (67)

@ 0.5" (125 Pa) 123 (58)

@ 0.6" (150 Pa) 100 (47)

@ 0.7" (175 Pa) 38 (18)

Max. Temperature Recovery 78%

Sensible Effectiveness
@ 67 cfm (32 L/s) 32°F (0°C) 76%

*Sensible Efficiency
@ 67 cfm (32 L/s) 32°F (0°C) 66%

*Sensible Efficiency
@ 68 cfm (32 L/s) -13°F (-25°C) 60%

VAC @ 60HZ 120

WATTS / Low speed. 63

WATTS / High speed 173

Amp rating 1.4

3 - High Speed
*2 - Medium Low Speed
*1 - Low speed

TM

HEAT RECOVERY VENTILATOR

FRESH AIR

DEFROST

DAMPER

DEFROST

PORT

FROM OUTSIDE

*All Duct Connections 6"(150mm)

STALE AIR

TO OUTSIDE

200

180

3

160

140

120

2

100

Air Flow (cfm)

1

80

60

40

20

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0 .8

Static Pressure (in w.g.)

*Manufacturer’s Data

FILTERS

STALE AIR

FROM INSIDE

CONDENSATE DRAINS

33-5/8"

BALANCING DAMPER

BLOWERS

FRESH AIR

TO INSIDE

*NOTE:

Front clearance of
25 inches (635 mm)
is recommended
for servicing unit.

19"

(483)

14 3/4"

(375)

4

0107

THERMALLY CONDUCTIVE, PATENTED ALUMINUM CORE

The cross-flow heat recovery core transfers heat between the two air streams.
It is easily removed for cleaning or service.

MOTORS AND BLOWERS

Each air stream has one centrifugal blower driven by a common PSC motor.

FILTERS

Washable air filters in exhaust and supply air streams.

MOUNTING THE HRV

Four threaded inserts at corners of case designed to accept four PVC reinforced
polyester straps that are supplied with the unit.

DEFROST

Damper defrost system; defrosts automatically as the outdoor temperature falls.

CASE

Twenty gauge prepainted galvanized steel (G60) for superior corrosion resistance. Insulated to
prevent exterior condensation. Drain connections two - 1/2" (12mm) OD.

WEIGHT

63 lbs. (28.7 kg)

SHIPPING WEIGHT

67 lbs. (30.4 kg)

CONTROLS - HRV System Control

HRV defaults to LOW SPEED when plugged in. HIGH SPEED option is accessible by connecting
remote controls to designated terminals inside electrical box of HRV.

Standard LOW SPEED SETTING can be increased to medium low.
Off (Standby)/Low or OFF/HIGH speed operation is also available.

OPTIONAL ACCESSORIES

99-101 Crank Timer
99-116 Dehumidistat Ventilation Control - Dehumidistat with ON/OFF
99-130 Dehumidistat Control - Dehumidistat
99-132 20 Minute Fan Timer - (3 wire) 20 gauge wire (min.) 100’ length (max.)
99-186 Weatherhoods, Two - 6" (150mm) c/w 1/4" (6mm) mesh screen
99-2040 20/40 ON/OFF Dehumidistat
All units conform to CSA and UL standards.

WARRANTY

Units carry a 15 year warranty on the heat recovery core and a five year replacement
parts warranty.

Engineering Data - HRV RNC20

Dimensions HRV inches (mm)

HEAT RECOVERY VENTILATOR

Date: ___________________________________________

Tag: _____________________Qty:___________________

Project: _________________________________________

Engineer: _______________________________________

Contractor: ______________________________________

Supplier: ________________________________________

Quote#: _________________________________________

Submitted by: ____________________________________

*Sensible Efficiency - thermal **Latent Efficiency - moisture

Note: Effectiveness - based on temp. differential between the 2 airstreams
Efficiency - takes into account all power inputs

Performance (HVI certified)

Net supply air flow in cfm (L/s) against external static pressure

E.S.P

(external static pressure) [cfm (L/s)]

@ 0.1" (25 Pa) 214 (101)

@ 0.2" (50 Pa) 206 (97)

@ 0.3" (75 Pa) 193 (91)

@ 0.4" (100 Pa) 184 (87)

@ 0.5" (125 Pa) 170 (80)

@ 0.6" (150 Pa) 155 (73)

@ 0.7" (175 Pa) 137 (65)

Max. Temperature Recovery 69%

Sensible Effectiveness
@ 119 cfm (56 L/s) 32°F (0°C) 67%

*Sensible Efficiency
@ 119 cfm (56 L/s) 32°F (0°C) 60%

*Sensible Efficiency
@ 117 cfm (55 L/s) -13°F (-25°C) 60%

VAC @ 60HZ 120

WATTS / Low speed. 70

WATTS / High speed 182

Amp rating 1.4

1

2

3

3 - High Speed
*2 - Medium Low Speed
*1 - Low speed

TM

HEAT RECOVERY VENTILATOR

240

220

200

180

160

140

120

Air Flow (c fm)

100

80

60

40

20

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0 .8

Static Pressure (in w.g.)

*Manufacturer’s data

FRESH AIR

FROM OUTSIDE

DEFROST

DAMPER

DEFROST

PORT

FILTERS

STALE AIR

FROM INSIDE

CONDENSATE DRAINS

33-5/8"

*All Duct Connections 6"(150mm)

BALANCING DAMPER

STALE AIR

TO OUTSIDE

BLOWERS

FRESH AIR

TO INSIDE

*NOTE:

Front clearance of
25 inches (635 mm)
is recommended
for servicing unit.

14 3/4"

(375)

19"

(483)

5

RNC95 Specifications

The RNC95 Heat Recovery Ventilator (HRV) has been
designed to allow the installer to choose between two pos­sible positions on the cabinet for the INDOOR EXHAUST
(return from building) port. Illustrations in this manual show
standard (side mounted) port location. The same specifi­cations apply to both RNC95 setups, regardless of which
port position is selected.

Variable Port Location / Installation (Model RNC95
only)

The exhaust return port collar is not factory installed.
Installer may choose either side mounted or alternate top
mounted port by simply removing one of the two knock-out
plates and attaching a port collar (supplied). To remove
knock-out plate, insert a utility knife into the knock-out slits
and trace them completely to puncture protective film
underneath. Then, cut the solid tabs between the slits,
using tin snips or side cutters, and remove the knock-out
plate. If any protective film still blocks the opening, remove
it now.

In order to make the RNC95 as space efficient as possi­ble, the INDOOR supply and return ports are converted
from round to oval shape. Overall size of the port remains
the same. Simply bend a standard duct fitting to the cor­rect shape, and attach to the oval port using the same
method as for a round port.

RNC95 Air Flow

Stale air enters the FRONT RIGHT side port. The air will
pass down the front half of the core, then up the back half
of the core and out the RIGHT REAR port.

Fresh outdoor air will enter the LEFT REAR port and pass
down the back half of the core. It will then pass up the
front half of the core, and out the LEFT FRONT port.

This unique configuration allows the air to actually travel
through the core twice, making the RNC95 almost as effi­cient as a double core unit.

Variable Port Location

SIDE MOUNTED PORT TOP MOUNTED PORT

standard location alternate location

Round port bent to oval

6

Location Selection

The HRV must be located in a heated space where it will
be possible to conveniently service the unit. Typically the
HRV would be located in the mechanical room or an area
close to the outside wall where the weather hoods will be
mounted. If a basement area is not convenient or does not
exist, a utility or laundry room may be used.

Attic installations are not normally recommended due to:

A) the complexity of work to install

B) freezing conditions in the attic

C) difficulty of access for service and cleaning

The HRV unit must be installed in a horizontal position as
shown in the illustration below. The unit should be sus­pended using the provided hanging straps. If necessary,
the unit may be installed on a platform: however, the cabi­net should be isolated from the platform to prevent
vibration transmission. The unit must be level. Sufficient
clearance at the front of the access door is required for
servicing the air filters and core. A minimum of 25"
(635mm) clearance is recommended so the door can be
opened. Four PVC reinforced polyester hanging straps are
provided for hanging the HRV from the basement floor
joists.

Suspending the Unit

The hanging straps should be attached to the unit at the
top end corners (mounting screws are already located on
the HRV case). Securely fasten the other end of the straps
to the floor joists with wide head nails (not supplied), mak­ing sure the UNIT IS LEVEL. The straps are designed to
reduce the possibility of noise, resonance or harmonics;
therefore using the full length of the strap between the
HRV and the floor joists is recommended.

Weatherhood Location and Installation

Weatherhood kit includes two fixed-cover hoods with a
1/4” (6mm) mesh screen.

Exhaust Weatherhood Requirements

• At least 6' (2 m) from the ventilation air intake*

• At least 18" (460mm) above ground or above the
depth of expected snow accumulation*

Installation

Connecting Appliances to the HRV

The following appliances should not be connected to the
HRV:

• clothes dryer

• range top

• stovetop fan

• central vacuum system

NOTE: Connecting any of these to the HRV will invali­date your warranty.

Clearances and Requirements

WARNING

Before installation, careful consideration must
be given to how this system will operate if
connected to any other piece of mechanical
equipment, i.e. a forced air furnace or air handler,
operating at a higher static. After installation, the
compatibility of the two pieces of equipment
must be confirmed, by measuring the air flows of
the ventilator, by using the balancing procedure
found in this manual.

It is always important to assess how the operation
of any HRV may interact with vented combustion
equipment (i.e. Gas Furnaces, Oil Furnaces,
Wood Stoves, etc.)

NEVER install a ventilator in a situation where its
normal operation, lack of operation or partial
failure may result in the backdrafting or improper
functioning of vented combustion equipment!

CAUTION

Lint, dust or grease will collect in the HRV
damaging the unit.

WARNING

Improper installation, adjustment, alteration,
service or maintenance can cause property
damage, personal injury or loss of life.
Installation and service must be performed by a
qualified installer or service agency.

WARNING

Electric shock hazard. Can cause
injury or death. Before attempting to
perform any service or maintenance,
turn the electrical power to unit OFF
at disconnect switch(es). Unit may
have multiple power supplies.

7

• At least 3' (1 m) away from the corner of the building*

• At least 3’ away from gas meter, electric meter or a
walkway where fog or ice could create a hazard*

• Not into a garage, workshop or other unheated space

When installing the weatherhood, its outside perimeter
must be sealed with exterior caulking.

* Local code may require greater distances.

Intake Weatherhood Requirements

• Should be located upstream (if there are prevailing
winds) from the exhaust outlet

• At least 6' (2 m) from the exhaust weather hood *

• At least 6' (2 m) away from dryer vents and air handler
exhaust (medium or high efficiency furnaces)*

• A minimum of at least 6' (2 m) from driveways, oil fill
pipes, gas meters, or garbage containers, swimming
pools*

• At least 18" (460mm) above the ground, or above the
depth of expected snow accumulation*

• At least 3' (1 m) from the inside/outside corner of the
building*

• Do not locate in a garage, attic or crawl space

* Local code may require greater distances.

Weatherhood Clearances

Suspending the Unit using the
Provided Hanging Straps

CAUTION

Weatherhood Installation

Unit must be installed level to ensure proper
condensate drainage. Due to the broad range of
installation and operational conditions,
consideration must be given for the possibility
of condensation forming on the unit or
connecting ducting. Objects below the
installation may be exposed to condensate.

OUTSIDE CORNER

36" (1m)

recommended min.

36" (1m)

recommended min.

INSIDE CORNER

31"

(787)

19"

(483)

*NOTE:

Frontclearanceof
25inches(635mm)
isrecommended
forservicingunit.

Unitisdesignedforhorizontal
installationonlyasshown.

Usingfulllengthhangerstrapsis
recommendedforvibrationcontrol,
butcanbeshorterifrequired.

SCREEN

(sideview)

12"galvanized

pipesupplied

EXTERIOR

1/4"(6mm)SCREEN

(frontview)

WALL

1. ThermalCollarslidesovergalvanized
sleeveofWeatherhood.

2. FastenThermalCollartoBelt.

3. SlidetheInsulatedFlexibleDuctingover
theWeatherhood'sgalvanizedsleeveand
fastenittotheThermalCollar.

4. Hoodishingedtoallowforeasyaccess

 forcleaningofbirdscreen.

WideHeadNails

WIDEHEAD

(notsupplied)

NAILS

(notsupplied)

STRAPS
AND
SCREWS

(supplied)

DETAIL

143/4"

(375)

COLLARISSUPPLIEDTO

ENSUREVAPOURBARRIER

IS100%SEALEDTO

WALLPLATE

6' (2m)

INTAKE

18" (460mm) min.

recommended min.

EXHAUST

18" (460mm) min.

CAUTION

Weatherhood arrangement - requires a minimum of 6'
(2m) separation and a minimum of 18" (460mm)
clearance above the higher of the grade or anticipated
snow level.

8

Air Duct Design and Installation

A well designed and installed ducting system will allow the
HRV to operate at its maximum efficiency.

Always try to keep duct runs as short and straight as pos­sible. See Installation Diagrams for various installation
options.

The inner and outer liners of the flexible insulated duct
must be clamped to the sleeve of the weatherhoods (as
close to the outside as possible) and the appropriate port
on the HRV. It is very important that the fresh air intake
line be given special attention to make sure it is well
sealed. A good bead of high quality caulking (preferably
silicone sealant) will seal the inner flexible duct to both the
HRV port and the weather hood prior to clamping with a
large zip tie.

To minimize air flow restriction, the flexible insulated duct
that connects the two outside weather hoods to the HRV
should be stretched tightly and be as short as possible.

Twisting or folding the duct will severely restrict air flow.
See below for the recommended connection of flexible
insulated ducts to the the outside weatherhoods and the
HRV.

Installing the Ducting Between the HRV &
Living Areas in the House

To maximize airflow in the duct system, all ducts should
be kept short and have as few bends or elbows as possi­ble. Forty-five degree elbows are preferred to 90° elbows.
Use “Y” tees instead of 90° elbows whenever possible.

All duct joints must be fastened with screws, rivets or duct
sealant and wrapped with mastic or a quality duct tape to
prevent leakage. Mastic is preferred but if duct tape is
used, we recommend aluminum foil duct tape.

Galvanized ducting from the HRV to the living areas in the
house is recommended whenever possible, although flexi­ble duct can be used in moderation if necessary.

To avoid possible noise transfer through the duct system,
a short length (approximately 12 inches or 300mm) of non­metallic flexible insulated duct should be connected
between the HRV and the supply/exhaust duct system.

The main supply and return lines to/from the HRV must be
6 inches (150mm) minimum. Branch lines to the individual
rooms may be as small as 4 inches (100mm), but 5 inch
(125mm) lines are preferred .

All ducts running through attics and unheated spaces must
be sealed and insulated to code.

Fresh Air Ducting

In applications that do not include an air handler, fresh air
should be supplied to all bedrooms and living areas,
excluding bathrooms, kitchen and utility areas. Grilles
should be located high on a wall or in ceiling locations.

Grilles that diffuse the air comfortably such as the Round
Diffuser are recommended.

If the floor is the only option available, then special care
should be taken in locating grilles. Areas such as under
baseboard heaters will help to temper the air. Also option­al inline duct heaters are available for mounting in the
supply duct work to add heat if required.

Direct Connection to Air Handler Duct System

Should you wish to hard duct the fresh air from the HRV
directly into the cold air return of the air handler, remem­ber to check the air flow balance of the HRV with the air
handler fan both "ON" and "OFF" to determine that it does
not imbalance the unit more than 10%.

Indirect Connection to Air Handler Duct System

If permitted by local codes, an indirect connection may be
made between the HRV fresh air duct and the air handler
return plenum. The fresh air from the unit may be directed
at a grille installed in the cold air return duct of the air han­dler. The fresh air outlet from the HRV should be no closer
than 4 inches (100mm) and no more than 12 inches
(300mm) from the grille.

WARNING

Include a short length of fabric, flex duct or
other non-metallic connector in the “Fresh Air to
Building” hard ducted line in order to keep the
HRV separately grounded (electrically) from the
air handler. This will avoid a possible shock
hazard to service people if a short to ground
develops in one of the devices.

FRESH AIR
FROM HRV

HRV

4" MINIMUM

12" MAXIMUM

RETURN AIR
DUCT FOR
AIR HANDLER