nuair ES Series User manual

Rev. 3.4 Sept 20, 2011
P.O. Box 2758
Windsor, Nova Scotia, B0N 2T0
Phone: [phone] Fax: [phone]
www.nu-airventilation.com
Email: [email protected]
ES SERIES
O
OP PE ER RA AT TI IN NG G, , M MA AI IN NT TA AI IN NI IN NG G & & I IN NS ST TA AL LL LI IN NG G Y YO OU UR R H HE EA AT T R RE EC CO OV VE ER RY Y
V
VE EN NT TI IL LA AT TO OR R
FOR MODELS ES100 AND ES170
* LEAVE THIS DOCUMENT WITH THE HOMEOWNER
Specifications, dimensions and ratings may change without notice
as a result of ongoing product development and improvements.

Rev. 3.4 Sept 20, 2011
TABLE OF CONTENTS
1. PERFORMANCE RATINGS & PHYSICAL DATA ..................................................................................................... 3
2. HOW THE NU-AIR SYSTEM WORKS......................................................................................................................... 5
3. INSTALLATION............................................................................................................................................................. 5
3.1. Installer's Responsibilities...................................................................................................................5
3.2. Installation System Options ...............................................................................................................6
3.3. Ducting to The Outside........................................................................................................................9
3.4. Mounting & Noise Control................................................................................................................10
3.5. Ductwork ............................................................................................................................................10
3.6. Drain Connections .............................................................................................................................11
3.7. Balancing the System: High and Low Speed...................................................................................12
4. CONTROLS................................................................................................................................................................... 14
4.1. Main Board Features.........................................................................................................................15
4.2. ES Series Controls—12V...................................................................................................................16
4.3. Windsor Series Controls & Switch-Based Control Options—24V................................................17
4.4. Furnace Interlock ..............................................................................................................................18
5. START-UP..................................................................................................................................................................... 19
6. OPERATING HINTS.................................................................................................................................................... 19
7. MAINTENANCE .......................................................................................................................................................... 19
7.5. Filters ..................................................................................................................................................19
7.6. Fans .....................................................................................................................................................19
7.7. Condensate Drain ..............................................................................................................................19
7.8. Heat/Energy Recovery Core .............................................................................................................19
7.9. Exterior Hoods ...................................................................................................................................20
7.10. Grills & Duct Work ...........................................................................................................................20
8. ANNUAL SERVICING: ............................................................................................................................................... 20
9. TROUBLE SHOOTING: .............................................................................................................................................. 21
10. ELECTRICAL SCHEMATICS .................................................................................................................................... 22
10.11. ES Series Wiring Diagrams...............................................................................................................22
10.12. Defrost, Recirculation and Furnace Interlock Settings..................................................................23
10.13. The ES Series Circuit Board & Remote Control Connections ......................................................24
10.14. ES Series Control Wiring..................................................................................................................25
10.15. DSTAT-1 Control Wiring .................................................................................................................26
10.16. WIN-1 Control Wiring ......................................................................................................................27
10.17. WIN-20 Control Wiring ....................................................................................................................28
10.18. Remote On/Off Switching and Spring Wound Timer Wiring.......................................................29
11. WARRANTIES.............................................................................................................................................................. 30

Nu-Air Ventilation Systems Inc. - HRV Operating & Installation Manual
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1. PERFORMANCE RATINGS & PHYSICAL DATA
Model: ES170
VENTILATION PERFORMANCE ENERGY PERFORMANCE
EXT.
STATIC NET SUPPLY GROSS AIR FLOW SUPPLY NET POWER SENSIBLE APPARENT
PRESSURE AIR FLOW SUPPLY EXHAUST TEMP. AIR FLOW CONSUMED RECOVERY SENSIBLE
in wg (Pa) cfm (l/s) cfm (l/s) cfm (l/s) ºF (ºC) cfm (l/s) Watts EFFICIENCY EFFECTIVENESS
0.1 (25) 185 (87) 188 (88) 193 (91) +32 (0) 62 (29) 46 65 73
0.2 (50) 176 (83) 178 (84) 180 (85) +32 (0) 86 (41) 62 63 70
0.3 (75) 160 (75) 163 (78) 166 (78) +32 (0) 115 (54) 76 61 68
0.4 (100) 148 (70) 150 (71) 152 (71)
0.5 (125) 137 (64) 139 (67) 141 (67) 13 (-25) 63 (30) 53 59 78
0.6 (150) 124 (58) 126 (61) 130 (61)
0.7 (175) 110 (52) 111 (52) 118 (55)
ELECTRICAL: 120V/1/60 Hz. 128W, 1.1A
This product earned the ENERGY STAR® by meeting strict energy efficiency guidelines set by Natural
Resources Canada and the US EPA. It meets ENERGY STAR requirements only when used in Canada.

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Model: ES100
VENTILATION PERFORMANCE ENERGY PERFORMANCE
EXT.
STATIC NET SUPPLY GROSS AIR FLOW SUPPLY NET POWER SENSIBLE APPARENT
PRESSURE AIR FLOW SUPPLY EXHAUST TEMP. AIR FLOW CONSUMED RECOVERY SENSIBLE
in wg (Pa) cfm (l/s) cfm (l/s) cfm (l/s) ºF (ºC) cfm (l/s) Watts EFFICIENCY EFFECTIVENESS
0.1 (25) 147 (69) 150 (71) 172 (81) +32 (0) 55 (26) 48 70 79
0.2 (50) 131 (61) 134 (63) 153 (72) +32 (0) 66 (31) 52 68 76
0.3 (75) 118 (56) 121 (57) 135 (64) +32 (0) 86 (40) 72 65 73
0.4 (100) 104 (49) 107 (50) 123 (58)
0.5 (125) 91 (43) 93 (44) 111 (52) 13 (-25) 64 (30) 58 56 80
0.6 (150) 76 (36) 78 (37) 92 (43)
0.7 (175) 64 (30) 66 (31) 79 (37)
0.8 (200) 52 (24) 53 (25) 64 (30)
ELECTRICAL: 120V/1/60 Hz. 84W, 0.7A
This product earned the ENERGY STAR® by meeting strict energy efficiency guidelines set by Natural
Resources Canada and the US EPA. It meets ENERGY STAR requirements only when used in Canada.

Nu-Air Ventilation Systems Inc. - HRV Operating & Installation Manual
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2. HOW THE NU-AIR SYSTEM WORKS
A. Powerful, centrifugal
blowers bring fresh air into
your home while an equal
amount of stale, humid air is
exhausted to the outside.
This is NU-AIR’s balanced
central ventilation system.
B. Incoming fresh air is filtered
before flowing through the
heat exchange core.
C. Stale, humid air flows
through the cross-flow heat
exchanger and transfers the
heat to the incoming fresh
air.
D. Warm fresh air is distributed to each room of the house through an independent ductwork system.
3. INSTALLATION
3.1. Installer's Responsibilities
Installers are responsible for the performance of the ventilation system and for ensuring that all codes
and standards are met.
Do not mount the fresh air supply near a source of contaminated air such as automotive exhaust, gas
or propane exhaust, garbage containers or oil tanks.
Do not connect a dryer exhaust to an HRV.
Combustion appliances such as furnaces and hot water heaters must not draw combustion air directly
from an HRV.
Do not connect a kitchen range hood to any part of this system.
Do not install in attics or other unconditioned spaces (min. 16º C).
Do not install in enclosed garages.
Try to maintain straight duct runs as much as possible, using as few joint fittings as possible.
Keep use of flexible ducting to a minimum.
Be sure to observe local codes regarding running and insulating ducts in unconditioned spaces.
Poorly insulated ducts run in unconditioned spaces will hamper the efficiency of the HRV.
Sizing the System
For residential applications you should have a minimum ventilation capacity of 10 cfm (5 L/s) per room.
The chart that accompanies the flow grid calibrates pressure readings to airflow. Refer to ASHRAE
Standard 62 for acceptable ventilation rates in commercial buildings.
Calculating TVC (Total ventilation Capacity) for Residential Applications:
•20 cfm for the master bedroom
•20 cfm for an unfinished basement

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•10 cfm for each other room in the house
Add these together to arrive at your TVC.
This method is called the “Room Count Method” and is part of CSA F326 (Residential Mechanical
Ventilation Systems). 0.3 air change per hour is no longer used.
3.2. Installation System Options
Before installing your HRV, please read these
instructions for correct installation. The Nu-Air HRV
is a self-contained system that is ready to be installed.
There are three commonly used and approved
methods of installation.
3.2.1. The Fully Ducted System
This system uses an independent duct system for
supply and exhaust air. The HRV is controlled
independently of all other equipment.
The best results are achieved when:
•Each room of the space is serviced with a vent
mounted in the ceiling or high on an interior wall (within 12" of the ceiling).
•Vents are located deep within a room, where they will not short circuit or create an
uncomfortable draft.
Areas typically serviced by Exhaust Air: Laundry Rooms, Kitchens, Bathrooms, other wet rooms.
Note. Kitchen exhaust grills should be equipped with a grease filter and must be located
at least 3 ft. horizontally in all directions from the surface of the range extended to the
ceiling.
Areas typically serviced by Fresh Air: Bedrooms, Living Rooms, Dining Areas, and Recreation Areas.
3.2.2. The Extended Exhaust System
This system uses the HRV in conjunction with a
forced air furnace distribution system. In this
system the HRV supply air to the house is
introduced into the return duct of the forced air
furnace. Separate, additional ductwork is used to
transfer stale air from the wet rooms to the HRV.

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3.2.3. Extended System, Continuous Ventilation
The furnace fan may not need to run continuously with this system. Check local code requirements. For
improved supply air distribution during continuous ventilation mode, the furnace may be interlocked to
the HRV. See Section 4.4 for wiring instructions and Section 10.2 for interlock settings.
3.2.4. Extended System, Intermittent Ventilation
If the HRV is operated intermittently, the furnace fan should be interlocked with the HRV for good
distribution of supply air during high-speed
ventilation conditions.
3.2.5. The Simplified System
This system uses the furnace's return plenum
for both supply air distribution and exhaust
air collection. The exhaust air connection
must be a minimum of 40 inches upstream
of the supply air connection to avoid short-
circuiting of the fresh air.
3.2.5.1. Simplified System - Continuous Ventilation & Intermittent Operation
For proper supply air distribution with this system, and to prevent short circuiting in the return air duct,
the furnace fan must run during ventilation mode. Interlock the furnace and HRV in accordance with
Sections 4.4 (wiring) and 10.2 (settings).
NOTES:
1) When selecting an installation option, consideration should be given to the increased electrical
consumption of the furnace fan. The way that your Heat/Energy-recovery ventilator is installed may
make a significant difference to the electrical energy that you will use. To minimize the electricity use of
the Heat/Energy-recovery ventilator, a stand-alone fully ducted installation is recommended. If you
choose a simplified installation that operates your furnace air handler for room-to-room ventilation, an
electrically efficient furnace that has an electronically commutated (EC) variable speed blower motor
will minimize your electrical energy consumption and operating cost.
2) In cases where the HRV is coupled with a central air handling system, the HRV fresh air supply duct
to the return air plenum shall be connected at a sufficient distance upstream of the plenum connection to
the furnace. This allows proper mixing and ensures appropriate air temperature at the furnace heat
exchanger in cold weather. For fuel-fired mid and high efficiency furnaces a minimum temperature of
15.5º C (60º F) is recommended at the heat exchanger. (Check the furnace manufacturer’s
specifications).
3) To ensure quiet operation of ENERGY STAR qualified HRV/ERVs, each product should be installed
using sound attenuation techniques, such as using a flexible connector between the unit and the rigid-
pipe supply and return ducts.

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4) Installing a user-accessible control with your product will improve comfort and may significantly
reduce the product’s energy use. Most building codes require a centrally located control with an on/off
switch.
3.2.6. Installation Supplies, Standard Issue Items:
The HRV comes equipped with:
Filters
Anti-Vibration Straps
Heat Recovery Core
Drain Hose Assembly
Balancing dampers are NOT REQUIRED. ES Series
HRVs from Nu-Air are equipped with a system which
allows the installer to adjust each motor in both high and
low speed.
Removable terminal blocks for timers, remote controls,
furnace interlock. A 4-wire and a 10-wire removable wiring
block are provided with the unit. To use these, gently remove the block from the HRV, fit the wire
into place and secure it in its trap, using a fine-tipped flat-headed screwdriver.
3.2.7. Control Options (sold separately)
The ES Series offers a wide range of control options to suit any lifestyle or preferred usage. The ES
Series line of digital touch-pad controls
come with wall plate and all fasteners
necessary to fix them into a standard
residential wall box.
ES Series 12 Volt Digital Controls
ES-T1: 20, 40, 60 minute timer
ES-M1: Off, Standby, Low, High
ES-M2: Off, Standby, Low, 20
min. Low/40 min. Standby
ES-M3: Off, Standby, Low, 20
min. Low/40 min. Recirculate
ES-M4: Off, Standby, Low, Recirculate (full-time)
ES Series controls can be used in any combination and in virtually any number, and can be wired in
series or in parallel. The user may toggle through and select any function, even if this interrupts a
current mode or cycle.
Windsor Series 24 Volt Controls
Windsor standard mechanical dehumidistat (DSTAT-1)
Windsor mechanical control (WIN-1)
Windsor 20 minute timers—up to 6 each system (WIN-20)

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Mix and Match Controls. Because the ES Series circuit board is equipped with separate, removable
terminal blocks to accommodate both ES Series and Windsor Series controls, both types of controls may
be used in the same installation.
3.3. Ducting to The Outside
Between the weather hoods and the HRV you must use fully insulated ducting with an integrated
vapour barrier. Insulated ducting with an integrated vapour barrier must also be used on all runs
passing through unheated areas. This will help avoid condensation problems and energy losses.
The minimum RSI value of insulation should equal that of the local building codes.
3.3.1. Weather Hood Installation
1. Insulated flex duct slides over the
galvanized sleeve of the weather hood.
2. Use sheathing tape (red) to join the inner
duct to the hood's sleeve.
3. Tape the vapour barrier to back of the hood
without compressing the insulation. Caulk
or foam seal around the collars and hoods to
eliminate air and water leaks.
4. Locate the hoods for easy access to the bird
screen for cleaning purposes.
5. Be sure to use exterior sealant along the top
and side edges of the hoods, tooling the
sealant to ensure a good seal.
Make the insulated duct that connects the weather hoods to the HRV as short as possible to minimize
airflow restrictions. Avoid sharp bends and stretch out the inner lining of the flex duct as much as
possible to reduce static pressure and maximize airflow. For runs over 12’, increasing flex diameter 1”
to next size up will reduce pressure drop in the duct.
3.3.1.1. Locating the Weather Hoods
There should be a minimum of 6’ (feet) of separation between the fresh air and exhaust hoods. Supply
hoods should be a minimum of 18” (inches) above the ground level. Exhaust hoods should be at least 4”
(inches) above the ground level. Holes through the wall should be 1” larger than the collar on the hood,
to allow for insulation. Fresh air hoods must be 3’ away from any other appliance exhaust vent or
furnace vent.
In addition ASHRAE Standard 62-99 recommends the following. Ventilation systems should be
designed to prevent the reintroduction of exhaust contaminants, condensation or freeze-ups and growth
of microorganisms. Make-up air inlets and exhaust air outlets shall be located to avoid contamination of
the makeup air. Contaminants from sources such as cooling towers, sanitary vents, vehicular exhaust,
and street traffic should be avoided. Consult local code requirements for minimum distances.

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3.4. Mounting & Noise Control
For maximum efficiency, the HRV should be installed in a heated
area. The HRV is designed to be hung from the ceiling by way of the
anti-vibration straps supplied. Avoid hanging the HRV directly below
a bedroom or other quiet area.
Connecting To Other Equipment - Residential Applications
Interconnection with a forced air furnace duct system is permissible (see Section 3.2.2); however, your
Nu-Air HRV is not intended to be connected to any other equipment or appliances.
Flexible ducting may be desired in some installations for noise
abatement. To ensure effective air flow, use only as much
flexible ducting as necessary and keep it taut.
3.5. Ductwork
Duct runs should be straight with a minimum of bends and
elbows. Joints should be tight fitting and sealed with duct tape or
duct sealer.
RECOMMENDATION: An engineer or other qualified person
should design the duct system.
RECOMMENDATION: Use galvanized duct whenever
possible. Although flexible duct can be used, its use should be
restricted to areas indicated (to outside hoods and in unheated
spaces).
All ducting must be supported every 3’ or less.
Be sure to seal all pipe joints with foil tape or a duct
sealant.
When possible, form elbow joints so that they are as
straight as possible.

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3.6. Drain Connections
Access to a drain or sump is required to handle the HRV condensate. Care should be taken to run the
condensate tube where it cannot freeze.
For best results, Nu-Air recommends the following steps be followed when installing drain kits on residential
HRV's.
1. Apply the rubber O-ring supplied to the flange of each drain spout (A)
2. Insert the drain spouts through the holes in the drain pan (B)
3. Use the provided nut to tightly secure the drain spout
4. Cut two lengths of drain hose (E) long enough to avoid kinking
5. Attach the hose to the drain spout by sliding it over the spout until it is tight to the bottom of the speed nut.
Repeat for the other side
6. Secure the hose to the spout with the plastic tie wraps (D)
7. Install the Tee (F) in either of the two ways shown in the drawings below
8. Attach the free end of the hose to the left fitting. Repeat for the other side
9. Use the remaining hose to form a "P" trap and terminate at the top of the tee
10. Pour approximately one cup of water into the drain assembly to form an air seal. This prevents gasses
from being drawn into the HRV/ERV

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3.7. Balancing the System: High and Low Speed
Balanced air flow between the supply and exhaust air streams is essential to the performance of an HRV
or ERV. With the ES Series, changing motor speeds or balancing is quick and simple with two buttons
recessed slightly into the unit’s cabinet. NO BALANCING DAMPERS ARE REQUIRED. Be sure to
close windows and doors, and turn off all exhaust fans/appliances during the
balancing procedure.
For High-Speed Adjustment/Balancing, use the following procedure:
1. Models built before August, 2011 (serial number up to/including:
ES1001108428, ES1701108425): Use and ES-M1 control and select “Hi”
for high speed. Otherwise, use a jumper wire between R1/R2 and SB and a
jumper wire between R1/R2 and TS terminals to initiate high speed.
Remove the jumper wires after balancing (see illustration right).
Models built from August, 2011 (serial number higher than those noted
above): Use any means to initiate high speed (e.g. ES-M1, R—H jumper wire,
or 24V R—H control) may be used.
2. Press and hold either the FRESH air or EXHAUST air pushbuttons (not
both) for 3 Seconds. Releasing the push-button places the unit in SPEED
ADJUST MODE.
3. Now press the corresponding pushbutton to
adjust the fresh air fan or the exhaust fan,
thereby changing the air flow. Each press
will reduce motor speed until the default
minimum is reached, at which point the
motor will return to its peak speed.
Allowing a brief pause between presses
(about 0.5 seconds), you will press the
adjust button about 70 times before reaching
minimum speed. During the balancing
procedure, you can switch between
adjusting the fresh air motor or exhaust air
motor.
4. To exit balancing/speed adjust mode, stop pressing buttons for 10 seconds. This will place the
unit back in operating mode with the new speeds saved to the circuit board’s memory.
Low-Speed Adjustment/Balancing. If low speed adjustment is desired, follow the same process to
adjust high speed, but use a jumper wire or remote control to put the unit into low speed to make low
speed adjustments.

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NOTE: Factory default low speed is 40% of max high speed.

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The equipment we recommend for balancing your system is easy to use, reliable and cost
efficient.
Once the HRV system is installed and the vapour barrier is completed, ensure the
following:
Close all windows, doors and fireplace dampers
Turn off any exhaust systems such as dryers, range hoods, bath fans and central
vacuums.
With multiple-speed forced air furnaces in Extended or Simplified systems, the
furnace should operate at continuous low speed.
To balance the HRV, you will need a device to measure air flow. It is recommended to
use either a magnehelic gauge or an air meter, both of which are available from Nu-Air.
Depending on the device you are using, follow one of the two procedures below:
Magnehelic Gauge:
1. Disconnect the flex connector from the rigid duct before any branch ducts and
Compress the flex duct and insert the flow grid. Tape the joint between the flow grid
and ductwork.
2. Set the HRV on high speed. Mount the magnehelic gauge level and plumb. Join the hoses from the
flow grid to the magnehelic gauge. The needle of the magnehelic gauge should read positively.
Switch hose connections if the needle falls below zero.
3. Record reading from guage and adjust the motor speed to the desired CFM.
4. Repeat the procedure for the next duct. Adjust motor speeds until air flow
readings are equal or within 10% of each other.
Air meter (Nu-Air Part Number 100460):
The 460 air meter is available from Nu-Air wholesalers and can be used to
quickly balance the HRV in less than five minutes.
1. Drill a ¼” hole in both the supply and exhaust ducts on the warm-side of the
machine at least 12” away from the HRV and any elbows, tees, etc.
2. Set the HRV on high speed.
3. Take a pressure reading in each duct and record the results.
4. Go back to the duct having the higher reading, and damper the airflow down
until the pressure reads to within 10% of the other air flow.
5. Use tape to reseal the holes.
6. To convert pressure readings to airflow (cfm or L/s) refer to the instructions
and table included with the air meter.
4. CONTROLS
Your machine is equipped for remote controls. Options include humidity sensing, off-on control,
intermittent and continuous modes, recirculation as well as high speed control from the dehumidistat or
timer(s). You can also interlock the furnace blower to the HRV. Various means of controlling the
system are described below.

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4.1. Main Board Features
•Powerful transformer – an almost unlimited number of ES Series controls can be connected in
either series or parallel. Up to six (6) WIN-20 Timers can be connected in parallel.
•Self-resetting fuse to protect the board against mis-wiring.
•Variable low and high speed control – each motor and both speeds may be adjusted individually
to ensure optimal ventilation rate, with minimal energy usage.
•Proportional defrost automatically adjusts defrost times and frequency according to outdoor
temperature.
•Furnace Interlock Options: Interlock in high and low speeds (default) or high speed only—
Sections 4.4, 10.2.
•Factory adjusted jumper setting for 220V/50Hz geographic areas.
•Jumper settings for various defrost and recirculation profiles.
The following sections outline some of these features and explain the board in greater detail. In most
applications, the factory settings for speed control, defrost, electrical service and fan/motor type will
never need to be changed. A qualified technician must do any service work done within the electrical
panel of the HRV.
Variable Low- and High-Speed Motor Control
As discussed and illustrated in Section 3, speed adjustment of each motor in both low and high speed is
possible using the FRESH and EXHAUST air pushbutton switches, located on the side of the unit.
12-Volt and 24-Volt Control Options
Because the ES Series comes complete with both a 12V (4-wire) and a 24V (up to 10 wires) terminal
block, your ES Series unit can be controlled by a variety of control means and strategies.
Self-Resetting Fuse
Field mis-wiring of controls, timers or dehumidistats may cause the fuse to trip. If this happens, remove
the control wires and allow the fuse to reset. This may take a few minutes. Check your manual for
proper wiring connections.
Defrost Cycles
The versatile ES Series main board is equipped with an array of jumpers which enable its use in a wide
range of machine types and allow for field modification if desired. Unless you request otherwise, your
ES Series model will arrive with optimal factory settings. For a typical ES Series model, the defrost
mechanism is described below.
5th Port, Recirculation Defrost.
On the ES100 & ES170 a temperature sensor is located in the fresh air stream before the core. When the
outdoor air temperature is measured below -5º C, a timed defrost cycle is initiated which will vary in
both frequency and duration at -10º C, -15º C and -20º C. For example, at -20º C, or lower the ES170
will run normally for 36 minutes and then shut off the exhaust air fan for 4 minutes, meanwhile closing a
damper to incoming outside air. Closure of the damper allows the unit to then draw air from a neutral
space through its (top) 5th port and circulate this warm indoor air (not from exhausted areas) through the
heat recovery core to defrost it. Timed cycles repeat until the temperature rises above - 5º C. Defrost has

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priority over all functions so that commands from all remote controls will start or resume after the
defrost cycle.
Note: When the machine is left in Standby, the damper automatically closes off the fresh air port to
prevent unwanted drafts while the machine is not in operation.
Selectable Furnace Interlock
The installer may choose between interlock whenever the HRV/ERV is on or only when the HRV/ERV
is operating in high speed (See illustration Section 10.2).
4.2. ES Series Controls—12V
Each ES Series control is equipped with a touch pad and 3 LED’s.
The touch pad is used to select mode of operation or turn the
appliance off. The LED’s indicate which mode of operation the
HRV/ERV is operating in.
All ES Series Controls connect to the 12V (4-wire) removable
terminal block. See Section 10 for wiring diagrams.
4.2.1. ES-T1 – 20/40/60 Minute Timer
This timer is used to make the unit operate in high speed for 20, 40 or 60 minutes and is typically
installed in bathrooms, kitchens and workspaces. You may toggle between functions or even cancel a
high speed run by tapping the touch pad. See Section 10.4 for wiring diagram.
4.2.2. ES-M1- Control
This basic control allows you to select from standby mode, full-time low speed, or full-time high speed.
The ES-M1 is ideal for installations where basic ventilation functions are required. See Section 10.4 for
wiring diagram.
Functions:
1. No LED: HRV/ERV is OFF
2. Stby: Unit is in standby, ready for a command
3. Lo: Unit operates in low speed continuously with high speed override from timers or sensors.
4. Hi: Unit operates in high speed continuously
4.2.3. ES-M2 - Control
While featuring the convenience of standby and low speed modes, the ES-M2 offers the additional
ability to ventilate in low speed for 20 minutes and then switch to standby for 40 minutes. This control is
recommended for homes with forced air heating systems. Use the 20/40 cycle during times of low
occupancy or extreme outdoor humidity. See Section 10.4 for wiring diagram.
Functions:
1. No LED: HRV/ERV is OFF
2. Stby: Unit is in standby, ready for a command
3. Lo: Unit operates in low speed continuously
4. 20 Lo/40 Stby: Unit cycles between 20 minutes continuous low and 40 minutes standby.
Selecting operation with ES Controls
is easy: Just tap the touch-pad!

Nu-Air Ventilation Systems Inc. - HRV Operating & Installation Manual
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4.2.4. ES-M3 - Control
ES Series units are equipped with a recirculation system that will not recycle bathroom air. The re-
circulation function of the ES-M3 enables you to re-circulate air for 40 minutes of every hour and is
recommended for homes with radiant or hybrid heating systems where constant circulation alleviates
stratification and dead zones. See Section 10.4 for wiring diagram.
Functions:
1. No LED: HRV/ERV is OFF
2. Stby: Unit is in standby, ready for a command
3. Lo: Unit operates in low speed continuously
4. 20 Lo/40 Rec.: Unit cycles between 20 minutes continuous low and 40 minutes recirculation.
4.2.5. ES-M4
The ES-M4 control offers the simplicity of the ES-M1, with the added convenience of full-time
recirculation mode. See Section 10.4 for wiring diagram.
Functions:
1. No LED: HRV/ERV is OFF
2. Stby: Unit is in standby, ready for a command
3. Lo: Unit operates in low speed continuously
4. Rec.: Unit operates in full-time recirculation with no outdoor air exchange.
4.3. Windsor Series Controls & Switch-Based Control Options—24V
All Windsor Series and other 24V controls connect to the 24V (10-wire) removable terminal block.
See Section 10 for wiring diagrams.
4.3.1. Standard Dehumidistat (Part # DSTAT-1)
With this basic control the system is designed to operate on a low speed for continuous ventilation. The
dehumidistat will switch the HRV to high speed when the relative humidity of the air around it exceeds
its set point. When the indoor humidity falls below the set point, the machine drops out of high speed.
The standard dehumidistat can be complemented with Win-20 timers, or any of the ES Series controls.
See Section 10.5 for wiring diagram.
4.3.2. Windsor Control (Part # WIN-1)
The Windsor Dehumidistat Control provides the same humidity control as the Standard Dehumidistat,
with the added functionality of a 3-position switch from which the operator can select three operating
modes. See Section 10.6 for wiring diagram.
1. OFF - disables all functions.
2. STANDBY - HRV is on standby (intermittent). High speed ventilation on demand from the
dehumidistat, or remote timers. i.e. Automatically resumes Standby mode after demand is
met.
3. CONTINUOUS - continuous low speed ventilation. HRV cycles to high speed on demand
from the dehumidistat or timers. i.e. Automatically resumes Continuous mode after demand
is met.
Also, the Windsor Control has a two position switch from which you can choose:

Nu-Air Ventilation Systems Inc. - HRV Operating & Installation Manual
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Constant - locks the motors in High speed
Standard – normal operating mode enables functions 2 and 3 above.
While it offers several convenient features and operating modes, the Windsor Control can be combined
with the ES –T1 20/40/60 or WIN-20 timer to further customize system functions.
4.3.3. Windsor Timer (WIN-20)
Install in bathrooms, kitchens, workstations or other locations where high-speed ventilation control is
needed. The machine will run at high speed for twenty (20) minutes and then return to its previous
operating condition. Up to six (6) timers can be connected in parallel. See Section 10.7 for wiring
diagram.
4.3.4. Remote On/Off Switching and Spring Wound Timers
Basic RNC type control can be achieved using a standard, DEDICATED light switch. Mechanical
(spring-wound) timers may also be used. See Section 10.8 for wiring diagram.
4.4. Furnace Interlock
For simplified duct systems, it is recommended that the HRV be interlocked with the furnace blower
such that the furnace fan runs when the HRV is on to distribute supply air throughout the space.
Depending on local Codes, you may choose to interlock whenever the HRV/ERV is operating at any
speed, or just high speed (see illustration Section 10.2). To prevent unintended operation of the air
conditioning system (some thermostats connect Y and G internally), the G line must be isolated. See
figure below.
Connect to the removable, 10-terminal block: i1, i2 and C.

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5. START-UP
•Ensure the controls are connected in accordance with Section 4.
•For electrical hook-up, plug into a 120 volt receptacle.
•Ensure that the machine is piped to an adequate drainage source, i.e. through the drain hose
supplied.
6. OPERATING HINTS
When a dehumidistat is used, set it at the desired level. Look for signs of excessive humidity or
dryness. Let your windows be your guide.
Winter Operation – 40% - 50% is recommended. Lower settings may be necessary in colder
zones to keep windows free of condensation.
Spring/Fall Operation- 50% - 60% is recommended
Summer Operation – For air conditioned homes run the HRV as recommended for winter
operation, i.e. continuous low speed or use a 20/40 setting. In homes without air conditioning,
there is no need to run the HRV during the day when windows are open. If the HRV is connected
to the bathrooms(s) or kitchen, use the standby setting. The normal dehumidistat summer setting
is 65%-80%.
7. MAINTENANCE
CAUTION: Disconnect power before servicing.
7.5. Filters
Dirty filters can reduce ventilation efficiency, result in unbalanced airflow and damage or shorten the
life of the motors. Vacuum every three months. Polyester filters should be replaced annually.
Permanent electrostatic filters are available from your Nu-Air dealer. Filters remove easily by opening
the front cover.
7.6. Fans
When cleaning the filters, take the opportunity to vacuum any interior surfaces including the fan blades.
No other service is required as these fans are designed to operate continuously without lubrication.
7.7. Condensate Drain
Twice per year wipe clean the condensate drain pan. Check the condensate drain and tubing to ensure
they are free flowing. The tubing must have an "S" or loop that traps a quantity of water to prevent air
from entering the HRV via this tubing.
7.8. Heat/Energy Recovery Core
The core (located behind the cover) should be removed and cleaned at least once a year, using a mild
detergent in cold water. To remove the cover of the machine, unlatch the two latches; slide the door to
right to release from hinges.

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7.9. Exterior Hoods
Regularly check the outside vents and clean any obstructions such as
grass, leaves or other debris. Do not replace the screen with mesh
smaller than 1/4" as this will restrict airflow. During winter operation,
ensure snow and frost does not build up and restrict or block openings.
7.10. Grills & Duct Work
Clean the grills when they are dusty or greasy with soap and water.
Check for punctures in the insulation jacket on the fresh air and exhaust
air ducts. Repair any punctures using foil tape.
8. ANNUAL SERVICING:
Your HRV should undergo annual general servicing by an accredited contractor. This servicing should
include the following:
a) The six maintenance items above.
b) A general check for proper operation. Controls and electrical connections should be inspected.
c) Verification that intake and exhaust air flows are properly balanced.
d) Re-balancing as necessary.