MODELS RNC95/RNC10/RNC20

TM

HEAT RECOVERY VENTILATOR

INSTALLATION INSTRUCTION FOR HEAT RECOVERY VENTILATOR (HRV)

Shipping and Packing List Application

Package 1 of 1 contains: Heat Recovery Ventilators (HRV) are designed to provide

1 - Assembled ventilator fresh air while exhausting an equal amount of stale air.

1 - Bag assembly containing: The HRV is equipped with an aluminum core. The device
uses the stale air that is being exhausted to condition the
2 - Drain spout assemblies (HRV units only) fresh air as it is being brought in.
4 - Hanging straps
1 - Installation manual General

Required Tools
These instructions are intended as a general guide and do
Installation Tools not supersede local codes in any way. Consult authorities
• tin snips • large zip ties who have jurisdiction before installation.
• assorted screw drivers • fabric flexible duct
Table of Contents
• electric drill - class I rated
• hammer • mastic tape Shipping and Packaging List ............................................1
• wire strippers • alum. foil duct tape Required Tools .................................................................1
• knife • zip ties
Application ........................................................................1
• caulking gun • 1/2” I.D. drain hose
General .............................................................................1
• smoke pencil
Balancing Tools Engineering Data...........................................................2-4
• Pitot Tube Balancing Kit [Case, 8 ft. vinyl tubing, Pitot RNC95 Specifications and Airflow ....................................5
tube, magnehelic gauge (0 - 0.25”), and mounting plate]
Clearances & Requirements.............................................6
• Pitot Tube with instructions and Digital Manometer (with
resolution of 0 - 0.25” - must read to 1/100ths of an Installation .....................................................................6-9
inch)
Application Illustrations..............................................10-12
Optional Accessories
• 20 Minute Fan Timer Electrical ........................................................................13
• Wall Mounted Dehumidistat Remote Control Devices.................................................14
• Weather hood Kit Wiring the Controls .........................................................15
• Round Diffuser
Operation ........................................................................16
4” (100mm)
Wiring Diagrams .............................................................17
6” (150mm)
8” (200mm) Interlocking HRV to Furnace...........................................18
• Kitchen Grille Air Flow Balancing.....................................................20-21
- may be required by code for kitchen applications Troubleshooting ..............................................................22
- contains removable grease filter
Maintenance ..................................................................23

* LEAVE FOR HOMEOWNER

NOTE: Due to ongoing research and product development, specifications, TW-01
0307
ratings and dimensions are subject to change without notice.

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 Engineering Data - HRV RNC95

TM

HEAT RECOVERY VENTILATOR

THERMALLY CONDUCTIVE, PATENTED ALUMINUM CORE

The cross-flow heat recovery core transfers heat between the two air streams.
Performance (HVI certified)
Net supply air flow in cfm (L/s) against external static pressure
It is easily removed for cleaning or service. E.S.P
MOTORS AND BLOWERS (external static pressure) [cfm (L/s)]
Each air stream has one centrifugal blower driven by a common PSC motor.
@ 0.1" (25 Pa) 76 (36)
FILTERS
Washable air filters in exhaust and supply air streams. @ 0.2" (50 Pa) 73 (34)
MOUNTING THE HRV
Four threaded inserts at corners of case designed to accept four PVC reinforced polyester straps @ 0.3" (75 Pa) 70 (33)
that are supplied with the unit. @ 0.4" (100 Pa) 66 (31)
DEFROST
Recirculating defrost system. @ 0.5" (125 Pa) 60 (29)
CASE Max. Temperature Recovery 88%
Twenty gauge prepainted galvanized steel (G60) for superior corrosion resistance. Insulated to Sensible Effectiveness
prevent exterior condensation. Drain connections two - 1/2" (12mm) OD. @ 60 cfm (28 L/s) 32°F (0°C) 88%
WEIGHT *Sensible Efficiency
52 lbs. (23.6 kg) @ 60 cfm (28 L/s) 32°F (0°C) 75%
SHIPPING WEIGHT *Sensible Efficiency
56 lbs. (25.4 kg) @ 62 cfm (29 L/s) -13°F (-25°C) 68%
CONTROLS - HRV System Control VAC @ 60HZ 120
HRV defaults to LOW SPEED when plugged in. HIGH SPEED option is accessible by connecting WATTS / Low speed. 60
remote controls to designated terminals inside electrical box of HRV.
WATTS / High speed 150
Standard LOW SPEED SETTING can be increased to medium low.
Amp rating 0.9
Off (Standby)/Low or OFF/HIGH speed operation is also available.
OPTIONAL ACCESSORIES *Sensible Efficiency - thermal **Latent Efficiency - moisture
99-101 Crank Timer Note: Effectiveness - based on temp. differential between the 2 airstreams
Efficiency - takes into account all power inputs
99-116 Dehumidistat Ventilation Control - Dehumidistat with ON/OFF
99-130 Dehumidistat Control - Dehumidistat 80
5 - High Speed
99-132 20 Minute Fan Timer - (3 wire) 20 gauge wire (min.) 100’ length (max.) 5
75
99-186 Weatherhoods, Two - 6" (150mm) c/w 1/4" (6mm) mesh screen
99-2040 20/40 ON/OFF Dehumidistat 70

99-RECIRC Recirculation Control

Air Flow (cfm)

All units conform to CSA and UL standards.All units conform to CSA and UL standards. 65

WARRANTY
60
Units carry a 15 year warranty on the heat recovery core and a five year replacement
parts warranty.
55

Dimensions RNC95 inches (mm) 50

0 0.1 0.2 0.3 0.4 0.5 0.6
Static Pressure (in w.g.)

18.5"
(470 mm) Hanging
straps (4)
knockout for Threaded
side mounting of inserts (4)
EXHAUST return port at corners
6" round collar
converted to oval
18.5"
(470 mm)
EXHAUST
Stale Air
SUPPLY
(622 mm)

to outside
Fresh air
24.5"

Removable 5" round collar

from outside
Heat Recovery 5" round collar
Core EXHAUST
Return air
SUPPLY from building
minimum Fresh air
to building Choice of port location
18 inches (459 mm) Knockouts on top and
required for 6" round
(conv. to oval) side of unit (use 1 only)
service access 6" round (conv. to oval)
Drain Pan collar
collar supplied
Drain spout 16"
(406 mm)
FRONT SIDE TOP

Date: ___________________________________________ Contractor: ______________________________________

Tag: _____________________Qty:___________________ Supplier: ________________________________________
Project: _________________________________________ Quote#: _________________________________________
Engineer: _______________________________________ Submitted by: ____________________________________
TW-RNC95
2 0107

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 Engineering Data - HRV RNC10

TM

HEAT RECOVERY VENTILATOR

THERMALLY CONDUCTIVE, PATENTED ALUMINUM CORE Performance (HVI certified)

The cross-flow heat recovery core transfers heat between the two air streams. It is easily removed Net supply air flow in cfm (L/s) against external static pressure
for cleaning or service. E.S.P
MOTORS AND BLOWERS (external static pressure) [cfm (L/s)]
Each air stream has one centrifugal blower driven by a common PSC motor. @ 0.1" (25 Pa) 177 (83)
FILTERS @ 0.2" (50 Pa) 164 (77)
Washable air filters in exhaust and supply air streams. @ 0.3" (75 Pa) 156 (73)
MOUNTING THE HRV @ 0.4" (100 Pa) 143 (67)
Four threaded inserts at corners of case designed to accept four PVC reinforced polyester straps
@ 0.5" (125 Pa) 123 (58)
that are supplied with the unit.
DEFROST @ 0.6" (150 Pa) 100 (47)
Damper defrost system; defrosts automatically as the outdoor temperature falls. @ 0.7" (175 Pa) 38 (18)
CASE Max. Temperature Recovery 78%
Twenty gauge prepainted galvanized steel (G60) for superior corrosion resistance. Insulated to Sensible Effectiveness
prevent exterior condensation. Drain connections two - 1/2" (12mm) OD. @ 67 cfm (32 L/s) 32°F (0°C) 76%
WEIGHT *Sensible Efficiency
63 lbs. (28.7 kg) @ 67 cfm (32 L/s) 32°F (0°C) 66%
SHIPPING WEIGHT *Sensible Efficiency
67 lbs. (30.4 kg) @ 68 cfm (32 L/s) -13°F (-25°C) 60%
CONTROLS - HRV System Control VAC @ 60HZ 120
HRV defaults to LOW SPEED when plugged in. HIGH SPEED option is accessible by connecting WATTS / Low speed. 63
remote controls to designated terminals inside electrical box of HRV.
WATTS / High speed 173
Standard LOW SPEED SETTING can be increased to medium low.
Amp rating 1.4
Off (Standby)/Low or OFF/HIGH speed operation is also available.
OPTIONAL ACCESSORIES *Sensible Efficiency - thermal **Latent Efficiency - moisture
99-101 Crank Timer Note: Effectiveness - based on temp. differential between the 2 airstreams
Efficiency - takes into account all power inputs
99-116 Dehumidistat Ventilation Control - Dehumidistat with ON/OFF
99-130 Dehumidistat Control - Dehumidistat 200
3 - High Speed
99-132 20 Minute Fan Timer - (3 wire) 20 gauge wire (min.) 100’ length (max.) 180
*2 - Medium Low Speed
*1 - Low speed
3
99-186 Weatherhoods, Two - 6" (150mm) c/w 1/4" (6mm) mesh screen 160
*Manufacturer’s Data
99-2040 20/40 ON/OFF Dehumidistat
140
All units conform to CSA and UL standards.
Air Flow (cfm)

120
WARRANTY 2
100
Units carry a 15 year warranty on the heat recovery core and a five year replacement
1
parts warranty. 80

60

40
Dimensions HRV inches (mm) 20
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
Static Pressure (in w.g.)

FRESH AIR
FROM OUTSIDE
* All Duct Connections 6"(150mm)
DEFROST
DAMPER STALE AIR
TO OUTSIDE
DEFROST
PORT

BLOWERS
(483)
19"

FILTERS *NOTE:
Front clearance of
25 inches (635 mm)
is recommended
for servicing unit.
STALE AIR FRESH AIR
FROM INSIDE TO INSIDE
14 3/4"
33-5/8" (375)
CONDENSATE DRAINS BALANCING DAMPER

Date: ___________________________________________ Contractor: ______________________________________

Tag: _____________________Qty:___________________ Supplier: ________________________________________
Project: _________________________________________ Quote#: _________________________________________
Engineer: _______________________________________ Submitted by: ____________________________________

3 0107

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 Engineering Data - HRV RNC20

TM

HEAT RECOVERY VENTILATOR

THERMALLY CONDUCTIVE, PATENTED ALUMINUM CORE Performance (HVI certified)

The cross-flow heat recovery core transfers heat between the two air streams. Net supply air flow in cfm (L/s) against external static pressure
It is easily removed for cleaning or service. E.S.P
MOTORS AND BLOWERS (external static pressure) [cfm (L/s)]
Each air stream has one centrifugal blower driven by a common PSC motor. @ 0.1" (25 Pa) 214 (101)
FILTERS @ 0.2" (50 Pa) 206 (97)
Washable air filters in exhaust and supply air streams. @ 0.3" (75 Pa) 193 (91)
MOUNTING THE HRV @ 0.4" (100 Pa) 184 (87)
Four threaded inserts at corners of case designed to accept four PVC reinforced
@ 0.5" (125 Pa) 170 (80)
polyester straps that are supplied with the unit.
@ 0.6" (150 Pa) 155 (73)
DEFROST
@ 0.7" (175 Pa) 137 (65)
Damper defrost system; defrosts automatically as the outdoor temperature falls.
CASE Max. Temperature Recovery 69%
Twenty gauge prepainted galvanized steel (G60) for superior corrosion resistance. Insulated to Sensible Effectiveness
prevent exterior condensation. Drain connections two - 1/2" (12mm) OD. @ 119 cfm (56 L/s) 32°F (0°C) 67%
WEIGHT *Sensible Efficiency
63 lbs. (28.7 kg) @ 119 cfm (56 L/s) 32°F (0°C) 60%
SHIPPING WEIGHT *Sensible Efficiency
67 lbs. (30.4 kg) @ 117 cfm (55 L/s) -13°F (-25°C) 60%
CONTROLS - HRV System Control VAC @ 60HZ 120
HRV defaults to LOW SPEED when plugged in. HIGH SPEED option is accessible by connecting WATTS / Low speed. 70
remote controls to designated terminals inside electrical box of HRV. WATTS / High speed 182
Standard LOW SPEED SETTING can be increased to medium low. Amp rating 1.4
Off (Standby)/Low or OFF/HIGH speed operation is also available.
OPTIONAL ACCESSORIES *Sensible Efficiency - thermal **Latent Efficiency - moisture
99-101 Crank Timer Note: Effectiveness - based on temp. differential between the 2 airstreams
Efficiency - takes into account all power inputs
99-116 Dehumidistat Ventilation Control - Dehumidistat with ON/OFF
99-130 Dehumidistat Control - Dehumidistat 240
3 - High Speed
99-132 20 Minute Fan Timer - (3 wire) 20 gauge wire (min.) 100’ length (max.) 220
3
*2 - Medium Low Speed
*1 - Low speed

99-186 Weatherhoods, Two - 6" (150mm) c/w 1/4" (6mm) mesh screen 200
*Manufacturer’s data
99-2040 20/40 ON/OFF Dehumidistat 180
Air Flow (cfm)

160
All units conform to CSA and UL standards.
140
WARRANTY
120
Units carry a 15 year warranty on the heat recovery core and a five year replacement 2
100
parts warranty. 1
80

60

40

Dimensions HRV inches (mm) 20

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
Static Pressure (in w.g.)

FRESH AIR
FROM OUTSIDE
* All Duct Connections 6"(150mm)
DEFROST
DAMPER STALE AIR
TO OUTSIDE
DEFROST
PORT

BLOWERS
(483)
19"

FILTERS *NOTE:
Front clearance of
25 inches (635 mm)
is recommended
for servicing unit.
STALE AIR FRESH AIR
FROM INSIDE TO INSIDE
14 3/4"
33-5/8" (375)
CONDENSATE DRAINS BALANCING DAMPER

Date: ___________________________________________ Contractor: ______________________________________

Tag: _____________________Qty:___________________ Supplier: ________________________________________
Project: _________________________________________ Quote#: _________________________________________
Engineer: _______________________________________ Submitted by: ____________________________________

0107
4
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 RNC95 Specifications RNC95 Air Flow
The RNC95 Heat Recovery Ventilator (HRV) has been Stale air enters the FRONT RIGHT side port. The air will
designed to allow the installer to choose between two pos- pass down the front half of the core, then up the back half
sible positions on the cabinet for the INDOOR EXHAUST of the core and out the RIGHT REAR port.
(return from building) port. Illustrations in this manual show Fresh outdoor air will enter the LEFT REAR port and pass
standard (side mounted) port location. The same specifi- down the back half of the core. It will then pass up the
cations apply to both RNC95 setups, regardless of which front half of the core, and out the LEFT FRONT port.
port position is selected.
This unique configuration allows the air to actually travel
through the core twice, making the RNC95 almost as effi-
Variable Port Location
cient as a double core unit.

Round port bent to oval

SIDE MOUNTED PORT TOP MOUNTED PORT

standard location alternate location

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 possi-
ble, 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 cor-
rect shape, and attach to the oval port using the same
method as for a round port.

5
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 Clearances and Requirements

Connecting Appliances to the HRV

WARNING The following appliances should not be connected to the
HRV:
Before installation, careful consideration must
be given to how this system will operate if • clothes dryer
connected to any other piece of mechanical • range top
equipment, i.e. a forced air furnace or air handler,
• stovetop fan
operating at a higher static. After installation, the
compatibility of the two pieces of equipment • central vacuum system
must be confirmed, by measuring the air flows of NOTE: Connecting any of these to the HRV will invali-
the ventilator, by using the balancing procedure
date your warranty.
found in this manual.

It is always important to assess how the operation

of any HRV may interact with vented combustion CAUTION
equipment (i.e. Gas Furnaces, Oil Furnaces,
Wood Stoves, etc.) Lint, dust or grease will collect in the HRV
damaging the unit.
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!

Installation

The HRV unit must be installed in a horizontal position as

WARNING shown in the illustration below. The unit should be sus-
pended using the provided hanging straps. If necessary,
Improper installation, adjustment, alteration, the unit may be installed on a platform: however, the cabi-
service or maintenance can cause property net should be isolated from the platform to prevent
damage, personal injury or loss of life.
vibration transmission. The unit must be level. Sufficient
Installation and service must be performed by a
clearance at the front of the access door is required for
qualified installer or service agency.
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
WARNING provided for hanging the HRV from the basement floor
Electric shock hazard. Can cause joists.
injury or death. Before attempting to Suspending the Unit
perform any service or maintenance, The hanging straps should be attached to the unit at the
turn the electrical power to unit OFF top end corners (mounting screws are already located on
at disconnect switch(es). Unit may the HRV case). Securely fasten the other end of the straps
have multiple power supplies. to the floor joists with wide head nails (not supplied), mak-
ing sure the UNIT IS LEVEL. The straps are designed to
Location Selection
reduce the possibility of noise, resonance or harmonics;
The HRV must be located in a heated space where it will
therefore using the full length of the strap between the
be possible to conveniently service the unit. Typically the
HRV and the floor joists is recommended.
HRV would be located in the mechanical room or an area
close to the outside wall where the weather hoods will be Weatherhood Location and Installation
mounted. If a basement area is not convenient or does not Weatherhood kit includes two fixed-cover hoods with a
exist, a utility or laundry room may be used. 1/4” (6mm) mesh screen.

Attic installations are not normally recommended due to: Exhaust Weatherhood Requirements
• At least 6' (2 m) from the ventilation air intake*
A) the complexity of work to install
• At least 18" (460mm) above ground or above the
B) freezing conditions in the attic
depth of expected snow accumulation*
C) difficulty of access for service and cleaning
6
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 Suspending the Unit using the
CAUTION Provided Hanging Straps
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
Wide
Head
Nails

of condensation forming on the unit or WIDE
HEAD

(not
supplied)
NAILS
connecting ducting. Objects below the (not
supplied)

installation may be exposed to condensate. STRAPS

31" AND

(787) SCREWS

(supplied)

(483)
19"
• At least 3' (1 m) away from the corner of the building*
• At least 3’ away from gas meter, electric meter or a
DETAIL
walkway where fog or ice could create a hazard*
• Not into a garage, workshop or other unheated space *NOTE:

/4

3 )
14 375
"

(
Front
clearance
of

When installing the weatherhood, its outside perimeter 25
inches
(635
mm)


is
recommended

must be sealed with exterior caulking. for
servicing
unit.

* Local code may require greater distances.

Intake Weatherhood Requirements Unit
is
designed
for
horizontal

• Should be located upstream (if there are prevailing installation
only
as
shown.
winds) from the exhaust outlet Using
full
length
hanger
straps
is

recommended
for
vibration
control,

• At least 6' (2 m) from the exhaust weather hood * but
can
be
shorter
if
required.

• At least 6' (2 m) away from dryer vents and air handler

exhaust (medium or high efficiency furnaces)*
Weatherhood Installation COLLAR
IS
SUPPLIED
TO

• A minimum of at least 6' (2 m) from driveways, oil fill SCREEN ENSURE
VAPOUR
BARRIER

(side
view) IS
100%
SEALED
TO

pipes, gas meters, or garbage containers, swimming WALL
PLATE
pools*
• At least 18" (460mm) above the ground, or above the
depth of expected snow accumulation* 12"
galvanized
pipe
supplied

• 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.
EXTERIOR

1/4"
(6
mm)
SCREEN WALL
(front
view)
1.
Thermal
Collar
slides
over
galvanized

sleeve
of
Weatherhood.
2.
Fasten
Thermal
Collar
to
Belt.
Weatherhood Clearances 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.
OUTSIDE CORNER 36" (1m) 36" (1m) INSIDE CORNER
recommended min. recommended min.

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

7
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 Air Duct Design and Installation
A well designed and installed ducting system will allow the
HRV to operate at its maximum efficiency.
WARNING
Always try to keep duct runs as short and straight as pos- Include a short length of fabric, flex duct or
sible. See Installation Diagrams for various installation other non-metallic connector in the “Fresh Air to
options. Building” hard ducted line in order to keep the
HRV separately grounded (electrically) from the
The inner and outer liners of the flexible insulated duct air handler. This will avoid a possible shock
must be clamped to the sleeve of the weatherhoods (as hazard to service people if a short to ground
close to the outside as possible) and the appropriate port develops in one of the devices.
on the HRV. It is very important that the fresh air intake
line be given special attention to make sure it is well Grilles that diffuse the air comfortably such as the Round
sealed. A good bead of high quality caulking (preferably Diffuser are recommended.
silicone sealant) will seal the inner flexible duct to both the If the floor is the only option available, then special care
HRV port and the weather hood prior to clamping with a should be taken in locating grilles. Areas such as under
large zip tie. baseboard heaters will help to temper the air. Also option-
To minimize air flow restriction, the flexible insulated duct al inline duct heaters are available for mounting in the
that connects the two outside weather hoods to the HRV supply duct work to add heat if required.
should be stretched tightly and be as short as possible. Direct Connection to Air Handler Duct System
Twisting or folding the duct will severely restrict air flow. Should you wish to hard duct the fresh air from the HRV
See below for the recommended connection of flexible directly into the cold air return of the air handler, remem-
insulated ducts to the the outside weatherhoods and the ber to check the air flow balance of the HRV with the air
HRV. handler fan both "ON" and "OFF" to determine that it does
not imbalance the unit more than 10%.
Installing the Ducting Between the HRV &
Living Areas in the House Indirect Connection to Air Handler Duct System
To maximize airflow in the duct system, all ducts should If permitted by local codes, an indirect connection may be
be kept short and have as few bends or elbows as possi- made between the HRV fresh air duct and the air handler
ble. Forty-five degree elbows are preferred to 90° elbows. return plenum. The fresh air from the unit may be directed
Use “Y” tees instead of 90° elbows whenever possible. at a grille installed in the cold air return duct of the air han-
dler. The fresh air outlet from the HRV should be no closer
All duct joints must be fastened with screws, rivets or duct
than 4 inches (100mm) and no more than 12 inches
sealant and wrapped with mastic or a quality duct tape to
(300mm) from the grille.
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 flexi-
ble duct can be used in moderation if necessary. FRESH AIR
FROM HRV
To avoid possible noise transfer through the duct system,
a short length (approximately 12 inches or 300mm) of non-
4" MINIMUM RETURN AIR
metallic flexible insulated duct should be connected 12" MAXIMUM DUCT FOR
AIR HANDLER
between the HRV and the supply/exhaust duct system. HR
V

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.

8
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 Stale Air Exhaust System Drain Connection (HRV Only)
The stale air exhaust system draws air from the points in During a defrost cycle, the HRV may produce some con-
the house where the worst air quality problems occur. densation. This water should flow into a nearby drain, or
Stale air ducts should be installed in the bathroom, be taken away by a condensate pump.
kitchen, and laundry room. Applications such as green-
houses, atriums, swimming pools, saunas, etc. have
unique ventilation requirements which should be CAUTION
addressed with an isolated ventilation system. Also, the air
The HRV and all condensate lines must be
handler return duct may be used to exhaust from. In this installed in a space where the temperature is
method, the exhaust air is not ducted back to the HRV maintained above the freezing point or freeze
with "dedicated lines" from bathrooms, kitchens, etc. protection must be provided.
Instead, the exhaust air is drawn out of the cold air return
of the air handler. The air handler blower must be run- The HRV cabinet has prepunched holes for the drain (see
ning when the unit is operating for this system to be below). Insert the drain spout through the hole in the drain
effective. pan. Do not forget the “O ring” which seals each spout to
the pan. REMEMBER TO HAND TIGHTEN ONLY the

CAUTION washer and lock nut which hold the drain spout in place.
Construct a P-Trap using the plastic tee connector. Cut
two lengths of hose and connect each piece to an end of
the “T” fitting, then connect the other ends to the two drain
spouts. Position the "T" fitting to point upward, andconnect
the drain line. Tape or fasten base to avoid any kinks. This
Balancing Dampers and Grilles creates a “trap” which will hold some condensate and pre-
Balancing dampers and/or adjustable grilles should be vent odors from being drawn up the hose and into the
used to balance the flow rates into and out of various fresh air supply of the HRV.
rooms.
Grilles or diffusers should be positioned high on the wall or
"P" Trap (HRV only)
in the ceiling. Kitchen exhaust grilles must never be con-
nected to a range hood. They should be installed at least 4 DRAIN HOSE PLUMBING
feet (1.2m) horizontally away from the stove. A hinged PRE-PUNCHED HOLES (2)

6”X10” (150 X 250mm) rectangular kitchen exhaust grille DRAIN PAN DRAIN PAN

is available as part number. This grille includes a remov-

able grease filter. Canadian building codes require that
DRAIN
kitchen grilles be equipped with washable filters. SPOUT DRAIN
SPOUT
Field-supplied balancing dampers should be installed
ZIP TIE TEE 1/2 " I.D.
external to the unit to balance the amount of stale air CONNECTOR DRAIN HOSE
being exhausted with the amount of fresh air being
TO DRAIN
brought into the house. Refer to Air flow Balancing sec-
tion.
Kitchen Grille HARD PIPE PLUMBING
PRE-PUNCHED HOLES (2)
REMOVABLE
FILTER DRAIN PAN DRAIN PAN

1/2" HARD PIPE

DRAIN DRAIN
SPOUT SPOUT
The Round Diffuser is
TEE
available in JOINT
TO DRAIN

4" (100mm)
6" (150mm)
8" (200mm)
Note: Secondary drain pan may be required to
Round protect from condensate leakage.
Diffusers

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 Application Illustrations HRV

Partially Dedicated System for HRV

● Stale air drawn from key areas of

home (bathroom, kitchen, laundry) WARNING
HRV must be balanced.
● Fresh air supplied to return
air duct of air handler

DIRECT CONNECTION of the SUPPLY AIR STREAM to the AIR HANDLER COLD AIR RETURN
(Stale air drawn from key areas of home)

Outdoors

Stale Air To Outside Return Air

3’ min.
recommended

Fresh Air From Outside

Cool Air
Return

STALE AIR from various parts of home.

i.e. bathrooms (if required), kitchens (if required).
Air
*Unit is normally balanced on HIGH speed Handler
with air handler blower ON.
Field-supplied
Balancing Damper
(optional)
High efficiency filter
or electronic air cleaner
NOTES:
1. Air handler blower may be required to operate when HRV is on to provide good air distribution.
2. Weather hood arrangement is for drawing purposes only. 6' (2m) minimum separation required.
18" (460mm) above grade minimum or above anticipated snow level .
3. Due to the differences in pressure between the HRV and the equipment it is being
connected to, the HRV air flow must be confirmed on site, using the balancing
procedure found in the installation manual.

WARNING
Defrost air port needs to be drawn from clean
area without combustion appliances. To avoid
backdrafting of combustion products, never
CAUTION
draw defrost air from a room with a naturally Weather hood arrangement - requires a minimum
aspirated appliance, i.e. furnace, hot water of 6’ (2m) separation and a minimum of 18" (460mm)
heater, gas dryer, stove, fire place etc. clearance above grade or anticipated snow level.

10
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 Simplified Installation for HRV
(Return/Return Method)

● It is mandatory that the air handler blower

run continuously or HRV operation be WARNING
interlocked with the air handler blower. HRV must be balanced.

● Check local codes/authority having

jurisdiction for acceptance.

DIRECT CONNECTION of both the HRV SUPPLY AIR STREAM and

EXHAUST AIR STREAM to the AIR HANDLER COLD AIR RETURN

Return Air *Unit is normally balanced on

HIGH speed with air handler
Outdoors
40" (1m) MINIMUM blower ON.
3’ (915 mm) min.
recommended
Stale Air To Outside

Fresh Air From Outside

Cool Air
Return

Stale Air From Building Fresh Air To House

Field-supplied
Air
Balancing Damper Handler
(optional)
NOTES:
1. Air handler blower must operate when ventilation from HRV is required.
The air handler should be set to run continuously or interlocked with HRV.
2. A minimum separation of 40 inches (1m) is required between the two direct connections.
3. The exhaust air connection should be upstream of the supply air connection to prevent
exhausting any fresh air.
High efficiency filter
4. Weather hood arrangement is for drawing purposes only. Six feet (2m) minimum separation required. or electronic air cleaner
18" inches (460mm) above grade minimum or above anticipated snow level.
5. Due to the differences in pressure between the HRV and the equipment it is being
connected to, the HRV's air flow must be confirmed on site, using the balancing
procedure found in the installation manual.

WARNING
Defrost air port needs to be drawn from clean
area without combustion appliances. To avoid
backdrafting of combustion products, never
CAUTION
draw defrost air from a room with a naturally Weather hood arrangement - requires a minimum
aspirated appliance, i.e. furnace, hot water of 6' (2m) separation and a minimum of 18" (460mm)
heater, gas dryer, stove, fire place etc. clearance above grade or anticipated snow level.

11
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 Fully Dedicated System for HRV

● Stale air drawn from key areas of

home (bathroom, kitchen, laundry) WARNING
HRV must be balanced.
● Fresh air supplied to main living
areas of house

Outdoors

Stale Air To Outside

Fresh Air From Outside

STALE AIR from various parts of home. Fresh air to house -

i.e. bathrooms (if required), kitchens (if required). main living areas...
bedrooms, living room,
*Unit is normally balanced on HIGH speed rec. room etc.
with air handler blower ON. Field-supplied
Balancing Damper
(optional)

NOTES:
1. Weather hood arrangement is for drawing purposes only. 6' (2m) minimum separation required.
18" (460mm) above grade minimum or above anticipated snow level .
2. The HRV air flow must be confirmed on site, using the balancing procedure found in the installation manual.

WARNING
Defrost air port needs to be drawn from clean
area without combustion appliances. To avoid
backdrafting of combustion products, never
CAUTION
draw defrost air from a room with a naturally Weather hood arrangement - requires a minimum
aspirated appliance, i.e. furnace, hot water of 6' (2m) separation and a minimum of 18" (460mm)
heater, gas dryer, stove, fire place etc. clearance above grade or anticipated snow level.

12
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 Electrical

The HRV unit should be plugged into a standard designat-

ed (120VAC) electrical outlet with a ground. The outlet WARNING
should be serviced by a separate 15 amp/120V circuit. An
In order to prevent electric shock when cleaning
extension cord should not be used with this appliance. A or servicing the HRV, it is extremely important to
qualified service technician should make any required confirm the polarity of the power line that is
electrical connections. switched by the safety (disconnect) switch. The
Remote Control Connections hot line (black) is the proper line to be switched.
Prior to connecting remote devices, it is advisable to To confirm the proper polarity, use a voltmeter
run self test on the HRV/ERV. or test lamp to ensure there is no power after
the switch when the door is open. Check
Low voltage connections between the emote controls, the between that point and ground (on the cabinet).
dehumidistat, or the fan timer should be made by a quali- Always make sure that the HRV is properly
fied service technician. Low voltage wires from the remote grounded.
controls are connected to the HRV micro-processor board.

13
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 Remote Control Devices

Optional Main Controls the circuit board DIP Switches (Refer to "Mode DIP Switch
The amount of ventilation required in your home will fluctuate Settings").
according to the activity level in the house. Higher activity levels The Dehumidstat Dial
require more ventilation. Main controls feature a dehumidistat dial. The dehumidistat is
Main controls can be mounted in a central location of the home used to reduce high winter humidity levels. The dehumidistat
(i.e. beside the furnace thermostat) which will provide the user activates high speed ventilation when the indoor humidity level
with complete control over their ventilation system from a conve- exceeds selected setting.
nient location.
The ON/OFF Switch
The ON/OFF Switch will turn the HRV ON or OFF. Controls with
ATTENTION
an ON/OFF switch can be modified to ON/Standby by adjusting Only one main control can be installed on your
system.

Ventilation Dehumidistat Recirculation Control

PART NO. 99-116 PART NO. 99-RECIRC Note: For use with RNC95 only
The High/Low Speed Switch initiates High or Low speed ventila- The Recirculation Switch will toggle from continuous low speed
tion. This control also has an ON/OFF Switch and a ventilation to recirculation mode (closes the fresh air damper and
Dehumidistat Dial (refer to "The ON/OFF Switch" and "The circulates the building air). The Dehumidistat Dial will initiate
Dehumidistat Dial" descriptions). High Speed ventilation when the indoor humidity level exceeds
the set point (regardless position of the RECIRC Switch.). This
control also has an ON/OFF Switch and a Dehumidistat Dial
(refer to "The ON/OFF Switch" and "The Dehumidistat Dial"
High/Low descriptions).
Speed Switch

DEHUMIDIS
TAT
Dehumidistat
Recirculation
Dial Dehumidistat
Switch
Dial
ON/OFF
Switch
ON/OFF
Switch

20/40 ON/OFF Dehumidistat Remote Dehumidistat

PART NO. 99-2040 PART NO. 99-130 White
The 20/40 Switch will toggle from continuous low speed ventila- The Remote Dehumidistat activates high speed ventilation when
tion to an intermittent mode of 20 minutes fan ON (in low speed) the indoor humidty level exceeds the set point.
and 40 minutes fan OFF. The Dehumidistat Dial will initiate High
Speed ventilation when the indoor humidity level exceeds the set
point (regardless position of the 20/40 Switch.). This control also Dehumidistat
has an ON/OFF Switch (refer to "The ON/OFF Switch" descrip- Dial
tion).

20/40 Dehumidistat
Switch Dial

ON/OFF
Switch

Optional Timers Timer is the best selection, however, the crank timer will be nec-
Timers should be present when the HRV is exhausting from essary if only 2 lead low voltage wires are present.
specific locations i.e bathrooms, laundry rooms. The 20 Minute

20 Minute Timer Crank Timer

PART NO. 99-132 PART NO. 99-101 Off 10
Connects to RED, BLACK and GREEN Connects to RED and BLACK termi- 20

(LED drive) terminals. Use a minimum of nals. Use a two 18 gauge low 60
30

three 20 gauge low voltage wire. Connect voltage wire. Mounts in a 2 x 4 box. 50 40

up to 4 on 100 ft (91 m) wire max. Mounts in The crank timer provides a solution
a 2 x 4 box. to installing a system where only 2
wires are present for the timers. Crank Dial
20 Minute Status Lights Touch Pad Rotate the dial for up to 60
The 20 Minute Status Light indicates The Touch Pad initi- minutes high speed opera-
high speed operation is activated. ates high speed tion.
operation.
14
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 Wiring the Controls

Dehumidistat Ventilation 2040 ON/OFF

Control (DVC) Dehumidistat
Remove Remove
Red to Red factory installed Red to Red
factory installed
jumper when jumper when Orange to
Orange to installing this
installing this Orange Orange
control* TAT control*
DEHUMIDIS

Black to Black Black to Black

Low Fan
to Blue

Circuit Board Circuit Board

Terminal Strip** Terminal Strip**

Remote Dehumidistat Recirculation Control

Red to Red Red to Red
Remove factory
Factory installed jumper Orange to
installed Orange
when installing
jumper* this control
Black to Black Black to Black

Recirculate
to Blue

Circuit Board Circuit Board

Terminal Strip** Terminal Strip**
Note: Recirc for use with RNC95 only

20 Minute Timer
(shown in a Decora Cover Plate)*** Crank Timer

Red to Red Factory Red to Red

Factory
installed installed
jumper* jumper*
Black to
Black to
Black Black Off 10
20
Green LED Drive
to Green
30
60
50 40

Circuit Board Circuit Board

Terminal Strip** Terminal Strip**

ATTENTION
Controls will use 2, 3 or 4 lead 20 gauge wire. Note
the number of leads required for each control (refer
to the above illustrations).

15
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 Operation

Self Test For most installations the HRV will normally be set to oper-
The ventilator will automatically initiate a self test ate continuously on low speed. To suit various lifestyles,
sequence when power is applied. Fan motor is cycled and the HRV offers a selection of operating modes.
then damper motor is cycled. Duration: Approximately 1.5 Method of Operation
mins. Good - intermittent operation at all times
How much ventilation do I need? Better - continuous operation during day or occupied
During seasons when your windows and doors are closed conditions, intermittent at night or unoccupied
(winter and summer if air conditioned) the HRV should Best - recommended continuous operation of both
operate continuously when the dwelling is occupied, and HRV and furnace/air handler blower
either continuously or intermittently when not occupied.

Mode DIP Switch Settings

Figure 1 - Factory DIP Switch Settings Figure 2-DIP Switch Settings for Standby (When
The factory setting of the DIP switches (located on the cir- using a Remote Control Device that has an
cuit board) provides continuous low speed ventilation. ON/OFF Switch)
Optional Remote Controls will initiate high speed ventila- This DIP Switch Setting can be adjusted when using a
tion. system control that has an ON/OFF switch (refer to
Remote controls with an ON/OFF switch (refer to "Remote "Remote Control Devices" in this manual). "STANDBY" is
Control Devices" in this manual) will shut the entire sys- achieved when the Remote Control Switch is in the "OFF"
tem down when the remote control is in the OFF position. position. The Dehumidistat and Timers will initiate high
Changing the remote control from OFF to STANDBY can speed ventilation regardless of the "ON/OFF" switch posi-
be achieved by Setting the DIP Switch as per Figure 2. tion when this DIP switch configuration is used.
Figure 2 ON

Figure 1 ON HS
REMOTE
HS
DFR2
REMOTE
DFR3
DFR2
DFR3

ATTENTION
Figure 2 may not meet building code conformance
in certain geographical areas. Check with your
local building authority.

Increasing Low Speed to Medium Low

The ventilator automatically operates on its lowest speed

when plugged in or switched on. This setting is factory
supplied from an autotransformer with two selectable low
speeds. To switch to a continuous medium low speed, an
installing contractor must interchange the red and blue
wires from the autotransformer inside the electrical box.
Whether or not this change is made, the HRV will only be
able to access a single selected low speed.
High speed is available with the use of optional remote
controls connected to the appropriate terminals inside the
electrical box.

16
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 Wiring Diagrams

RNC3
WIRING
DIAGRAM
LEGEND

HIGH
VOLTAGE

12V

LOW
VOLTAGE
AUTO
FIELD
INSTALLED TRANSFORMER INTERFACE
12V
LOW
VOLTAGE RELAY
CONTACTS

RED
BLACK
BLACK
120V
FAN
MOTOR
DETAILS POWER


SUPPLY



WHITE

BLUE
WHITE
TO
GREEN MOTOR
T9
T6
BLACK

GREEN

AUTO
TRANS
T2 T3 T4 T5 T6 T7 T8 T9
ITE N/C COMMON N/O
WH
ORANGE

CAPACITOR RE
D

NEUTRAL SPARE LINE FAN O/P

YELLOW

T10 T11 T12

T1
C4 C5
SEE GROUND
DEFROST
DETAIL
P1
VDR2
DIRECT
MOUNTED
CAPACITOR
VDR3
K1 K2 K3 8 K4
RED
FACTORY
3/4
AMP
FUSE

+12V
INSTALLED ORANGE
JUMPER OBCS
DEFROST
DETAILS VDR1
BLACK
DEHUMIDISTAT

Model
RNC5
(Only) PCB
PLUG
-
IN
- + GREEN
LED
DRIVE

1 2 C1 RECIRCULATE
CR1 NON-
P1
ON LOW
FAN
PLUG
IN
12VAC FUNCTIONAL
CONNECTOR
P4 HS GREEN
GROUND
FUTURE USE
BLACK 3 4 REMOTE
BLACK TERMINALS
DFR2
ORANGE ORANGE BLUE COMMS
DFR3
PIN
1
-
RED RED
RED RED
PIN
2
-
ORANGE
1 P5
PIN
3
-
BLACK P3 SW1
BI-DIRECTIONAL P2
DAMPER
MOTOR PIN
4
-
SPARE THERMISTOR
DEHUMIDISTAT

PCB
PLUG
-
IN
1 2
P1
PLUG
IN
CONNECTOR
BLACK BLACK 3 4

ORANGE ORANGE INTERNAL

RED RED
PIN
1
-
BLACK DEHUMIDISTAT
PIN
2
-
ORANGE (IF
APPLICABLE)
BI-DIRECTIONAL PIN
3
-
RED
DAMPER
MOTOR PIN
4
-
SPARE

WALL
MOUNTED
DEHUMIDISTAT 20
MINUTE
FAN
TIMER DVC

*Remove
factory
installed



jumper
on
circuit
board

TAT


DEHUMIDIS Red
to
Red

(12V)
Black
to
Black

(Dehumidistat)
distat

Dehumi
to

Relative
Setting

Outside

Conditio
ns
Red
to
Red

(12V)
:
WINTER at

Black
to
Black

(Dehumidistat)
idist
Set
dehum
to
40%.
between

30%
If
home
i


s
too
dry, .

tting
Black
to
Black

(Dehumidistat) Red
to
Red

(12V)

higher
se id,
adjust
to
s
too
hum .
If
home
i tting

lower
se
adjust
to
Green
to
Green

(LED
Drive) Orange
to
Orange

(OBCS)
:
SUMMER at

idist
Set
dehum
to
OFF.

98-RNC3-001
INSHRV
0104

17
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 Interlocking HRV Operation to an Airhandler/Furnace Blower

When using the Interface relay contacts to initiate blower operation on a fur-
nace, certain thermostats will initiate the outdoor cooling condenser when
R and G are closed.

Use this wiring configuration to prevent the Interface relay contacts from initializing
the condenser unit. This problem can occur at the thermostat because the Y termi-
nal is connected to the G terminal internal to the stat. When R and G are closed at
the furnace (by dehumidistat or relay) 24 Volts is sent to G at thermostat. 24 Volts is
then sent through Y which will initiate outdoor condenser.

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 Dehumidistat Operation (HRV only)

The optional HRV remote controls include a dehumidistat The dehumidistat switches the ventilator to high speed
which controls humidity levels during the heating season. when the moisture level in the building exceeds the
The control has a selector knob with set points ranging desired setpoint. The dehumidistat switches the HRV back
from 20% to 80% relative humidity (RH). Most people are to low speed ventilation when the humidity has been
comfortable when indoor relative humidity levels are in a reduced below the setpoint. The dehumidistat should
range from 30 to 45%. only be used during the heating season. It must be set
to OFF position throughout the rest of the year.

Defrost Operation

Damper Defrost
The damper defrost HRV has an electronically controlled CAUTION
damper defrost mechanism. The defrost timer is activated
when the outside temperature drops below 27°F (-3°C). A Lengthening the run time may result in ice
motor driven damper door mechanism closes off the sup- buildup on the core.
ply air from ouside allowing the exhaust air to recirculate
through the unit. After the defrost period, the damper oper-
ates in the opposite direction to reopen the fresh air port.
Defrost cycle repeats until the temperature again rises
above 27°F (-3°C).

Defrost Cycle DIP Switch Settings

Defrost DIP Switch Settings (located on the circuit board)

can be adjusted to increase the unit’s run (ventilation)
time. The three minute defrost time cannot change.

Factory Setting Option 1* Option 2*

3 minute defrost time 3 minute defrost time 3 minute defrost time
17 minute run time 25 minute run time 30 minute run time
ON ON ON

HS HS HS
REMOTE REMOTE REMOTE
DFR2 DFR2 DFR2 OFF
DFR3 OFF DFR3 ON DFR3
ON

SW1 SW1 SW1

*Lengthening the run time may result in ice build-up on the core.

19
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 Air Flow Balancing

It is necessary to have balanced air flow in an HRV. The vol- The first step is to operate all mechanical systems on high
ume of air brought in from the outside must equal the volume speed, which have an influence on the ventilation system, i.e.
of air exhausted by the unit. If the air flow is not properly bal- the HRV itself and the air handler, if applicable. This will pro-
anced, then: vide the maximum pressure that the HRV will need to
• The HRV may not operate at its maximum efficiency overcome, and allow for a more accurate balance of the unit.
• A negative or positive air pressure may occur in the house Drill a small hole in the duct (about 3/16"), three feet down-
• The unit may not defrost properly stream of any elbows or bends, and one foot upstream of any
• Failure to balance HRV properly may void warranty elbows or bends. These are recommended distances but the
actual installation may limit the amount of straight duct.
The Pitot tube should be connected to a magnehelic gauge or
CAUTION digital manometer capable of reading from 0 to 0.25 in. (0-62
Pa) of water, preferably to 3 digits of resolution. The tube
Ensure balanced air flow in HRV. Excessive coming out of the end of the Pitot is connected to the high
pressure side of the gauge. The tube coming out of the
positive pressure may drive moist indoor air into
branch of the Pitot is connected to the low pressure or refer-
the external walls of the building where it may ence side of the gauge.
condense (in cold weather) and degrade
Insert the Pitot tube into the duct; pointing the tip into the air
structural components. May also cause key
flow.
holes to freeze up.
For general balancing it is sufficient to move the Pitot tube
around in the duct and take an average or typical reading.
Repeat this procedure in the other (supply or return) duct.
Excessive negative pressure may have several undesirable
Determine which duct has the highest air flow (highest read-
effects. In some geographic locations, soil gases such as
ing on the gauge). Then damper that air flow back to match
methane and radon gas may be drawn into the home through
the lower reading from the other duct. The flow should now
basement/ground contact areas.
be balanced.
Actual air flow can be determined from the gauge reading.
WARNING The value read on the gauge is called the velocity pressure.
The Pitot tube comes with a chart that will give the air flow
Ensure balanced air flow in HRV/ERV. Excessive velocity based on the velocity pressure indicated by the
negative pressure may also cause the back- gauge. This velocity will be in either feet per minute or meters
drafting of vented combustion equipment. per second. To determine the actual air flow, the velocity is
multiplied by the cross sectional area of the duct being mea-
sured.
Read the Application Warning in Clearances & Requirements sec-
tion of this manual! This is an example for determining the air flow in a 6" duct.
Prior to balancing, ensure that: The Pitot tube reading was 0.025 inches of water.
1. All sealing of the duct system has been completed. From the chart, this is 640 feet per minute.
2. All of the HRV’s components are in place and The 6" duct has a cross sectional area of
functioning properly. = [3.14 x (6"÷12)2]÷4
3. Balancing dampers are fully open. = 0.2 square feet
4. Unit is on HIGH speed. The air flow is then:
5. Air flow in branch lines to specific areas of the house 640 ft./min. x 0.2 square feet = 128 cfm
should be adjusted first prior to balancing the unit. A For your convenience, the cross sectional area of some com-
smoke pencil used at the grilles is a good indicator of mon round duct is listed below:
each branch line's relative air flow.
DUCT DIAM. (inches) CROSS SECTION AREA (sq. ft.)
6. After taking readings of both the stale air to the HRV duct
and fresh air to the house duct, the duct with the lower 5 0.14
CFM ([L/s] velocity) reading should be left alone, while the 6 0.20
duct with the higher reading should be dampered back to 7 0.27
match the lower reading.
The accuracy of the air flow reading will be affected by how
7. Return unit to appropriate fan speed for normal operation close to any elbows or bends the readings are taken.
8. A field-supplied balancing damper for the stale air side Accuracy can be increased by taking an average of multiple
is required for system balancing. readings as outlined in the literature supplied with the Pitot
tube.
Balancing Procedure
The following is a method of field balancing an HRV using a
Pitot tube, which is advantageous in situations when flow sta-
tions are not installed in the duct system. Procedure should
be performed with the HRV on high speed.

20
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 Pitot Tube and Gauge

Pitot Tube Air Flow

Balancing Kit
DUCT with magnehelic gauge,
Pitot tube, hose and
AIR carry case.

FLOW

Pitot tube

Magnehelic gauge

High Pressure Side

ELIC
MAGNEH

Low Pressure Side

Placement of Pitot Tube HRV

NOTE: Graphic is for illustrative purposes only.

Duct connection ports may vary.

Place pitot tube a minimum of 18" from blower or elbows

Note: Duct connections may vary,

depending on model.
Outdoors

Pitot Pitot
tube tube
Field-supplied Balancing Magnehelic
Balancing Damper Damper gauge
(optional)

Magnehelic
MAGNEHELIC MAGNEHELIC

gauge

NOTE: Apply use of balancing dampers as required.

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 Troubleshooting

Symptom Cause Solution

Poor Air Flow • 1/4” (6mm) mesh on the outside hoods is plugged • clean exterior hoods or vents
• filters plugged • remove and clean filter
• core obstructed • remove and clean core
• house grilles closed or blocked • check and open grilles
• dampers are closed if installed • open and adjust dampers
• poor power supply at site • have electrician check supply voltage at house
• duct is restricting HRV • check duct installation
• improper speed control setting • increase the speed of the HRV
• HRV air flow improperly balanced • have contractor balance HRV

Supply air feels cold • poor location of supply grilles, the air flow may irritate • locate the grilles high on the walls or under the baseboards,
the occupant install ceiling mounted diffuser or grilles so as not to directly
spill the supply air on the occupant (eg. over a sofa)
• outdoor temperature extremely cold • turn down the HRV supply speed. A small duct heater (1kw)
could be used to temper the supply air
• placement of furniture or closed doors is restricting themove-
ment of air in the home
• if supply air is ducted into air handler return, the air handler fan
may need to run continuously to distribute ventilation air com-
fortably

Dehumidistat is not Operating • improper connection to ventilator • check that the correct terminals have been used
• external low voltage is shortened out by a staple or nail • check external wiring for a short
• check dehumidistat setting it may be on OFF • set the dehumidistat at the desired setting

Humidity Levels are too High in Winter • dehumidistat is set too high • set dehumidistat lower
Condensation is appearing on the .• lifestyle of the occupants • avoid hanging clothes to dry, storing wood and venting clothes
windows dryer inside. Heating wood may have to be moved outside
• moisture coming into the home from an unvented or • vent crawl space and place a vapor barrier on the floor of the
unheated crawl space crawl space
• moisture is remaining in the washroom/bathroom and • ducts from the washroom/bathroom should be sized to remove
kitchen areas moist air as effectively as possible, use of a washroom/bath-
room fan for short periods will remove additional moisture
• timer or fan can be added to washroom/bathroom exhaust
• condensation seems to form in the spring and fall • on humid days, as the seasons change, some condensation
may appear but the home’s air quality will remain high with
some HRV use
• HRV is set at too low a speed • increase speed of the HRV

Humidity Levels are too Low • dehumidistat control set too low • set dehumidistat higher
• blower speed of HRV is too high • decrease HRV blower speed
• lifestyle of occupants • humidity may have to be added through the use of humidifiers
• HRV air flow may be improperly balanced • have a contractor balance HRV air flow

HRV and / or Ducts Frosting up • Note: minimal frost build-up is expected on cores before
unit initiates defrost cycle functions
• HRV air flow is improperly balanced • have HVAC contractor balance the HRV
• malfunction of the HRV defrost system • ensure working properly.

Condensation or Ice Build Up in • incomplete vapor barrier around insulated duct • tape and seal all joints
Insulated Duct to the Outside • a hole or tear in outer duct covering • tape any holes or tears made in the outer duct covering
• ensure that the vapor barrier is completely sealed

Water in the bottom of the HRV • drain pans plugged • ensure O-Ring on drain nozzle sits properly
• improper connection of HRV drain lines • look for kinks in line
• HRV is not level • check water drain connections
• drain lines are obstructed • make sure water drains properly from pan
• HRV heat exchange core is not properly installed

20 Minute Timer Not Working • Wiring • disconnect external controls and run unit through self test. If
• Faulty control the unit runs through self test successfully, then the circuit
• Faulty circuit board board is okay.
• check wiring connection.
• make sure wires are connected to proper terminals.
• test 20 Minute Timer, press and hold the button for 10 seconds
then release. The unit should run on high speed and then return
to normal operation when the button is released.

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 Maintenance HRV

1. Inspect Exterior Hoods at least once a month. 4. Motors - Maintenance Free

Make sure exhaust and fresh air supply hoods are not 5. Drain (condensate) Line - Clean Once a Year
blocked or restricted by leaves, grass, or snow. In winter, it Inspect drain line, drain spout and “P” trap for blockage,
is especially important to make sure snow is not blocking mold or kinks. Flush with warm soapy water and replace if
the hoods or that frost has not built up on the wire mesh worn, bent or unable to clean.
(bird screen). 6. Clean Duct System if Required
WARNING: Blockage of hoods may cause an imbal- The duct system running to and from the HRV may accu-
ance. mulate dirt. Wipe and vacuum the duct once every year.
2. Clean Air Filters - Twice a Year You may wish to contact a Heating/Ventilation company to
The standard filters equipped with your HRV are remov- do this.
able and washable. 7. General Maintenance - Twice a Year
a) simply open access door and slide core out Wipe down the inside of the cabinet with a damp cloth to
b) remove filter clips remove dirt, bugs and debris that may be present.
c) once clips are removed filters can be taken off the 8. Cleaning the Fans
core to be rinsed with water or a combination of mild Fans may accumulate dirt causing an imbalance and/or
soap and water. Do not clean in the dishwasher excessive vibration of the HRV. A reduction in the air flow
may also occur. In new construction this may result within
d) to re-assemble, place clean filter(s) (wet or dry) back
the first year due to heavy dust and may occur periodically
into their positions against the core and return clips to
after that over time depending on the outdoor conditions.
their original position
• unplug the HRV and open the service door
e) slide core back into its original position
• remove the core
3. Clean Core - Twice a Year
a) open access door • remove ducting (metal and/or flexible insulated type)
from the red and/or blue ports which are connected
b) carefully grip ends of core and pull evenly outward.
immediately inline with the fan assembly
-core may be snug, but will slide out of the channel
• use a small brush, such as a toothbrush or pipe
c) once removed from the cabinet remove filters
cleaner, and insert first
d) wash core in warm soapy water
(a) through the large opening of the fan assembly and
(do not use dishwasher)
then
e) install the clean filters
(b) through the smaller opening in the end of the fan
f) install clean core assembly
Note: Core installation label on the outer end of the • scrub individual fan blades until clean. Avoid moving or
core. damaging balancing flat weight, clip is usually found on
To install the clean core: one or more of the fan blades
a) first mount the bottom flange of the core guide into the • vacuum and wipe
bottom H channel approximately 1/4” (6mm)
• reassemble making sure ducting is reattached firmly
b) mount the left or right side flange of the core guide and insulation and moisture barrier are sealed and
approximately 1/4” (6mm) followed by the other side taped
c) mount the top flange of the core guide into the top H Before attempting this task, thought should be given
channel approximately 1/4” (6mm) to having a qualified service technician complete the
d) with all four corners in place and the core straight and service work.
even, push hard in the center of the core until the core
stops on the back of the cabinet
NOTE: Core will appear to stick out from cabinet
approximately 1/8” (3mm). This is designed this way
so that the access door will fit tight against the core.

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