P.O. Box 2758 Windsor, Nova Scotia, B0N 2T0
Phone: 902-798-2261 Fax: 902-798-2557
www.nu-airventilation.com Email: nuair@nu-airventilation.com
CONTRACTOR EDITION HRV’S
OOPPEERRAATTIINNGG,, MMAAIINNTTAAIINNIINNGG && IINNSSTTAALLLLIINNGG YYOOUURR HHEEAATT RREECCOOVVEERRYY
FOR MODELS CEA15-R, CEA18-C, AND CEA20-D
* LEAVE THIS DOCUMENT WITH THE HOMEOWNER
Specifications, dimensions and ratings may change without notice
as a result of ongoing product development and improvements.
Rev. December 19, 2008
VVEENNTTIILLAATTOORR
TABLE OF CONTENTS
1. HOW THE NU-AIR SYSTEM WORKS ......................................................................................................................... 3
2. INSTALLATION............................................................................................................................................................. 3
2.1. Installer's Responsibilities...................................................................................................................3
2.2. Installation System Options ............................................................................................................... 3
2.3. Ducting to The Outside........................................................................................................................5
2.4. Mounting & Noise Control..................................................................................................................6
2.5. Port Configurations ............................................................................................................................. 6
2.6. Ductwork .............................................................................................................................................. 7
2.7. Drain Connections ............................................................................................................................... 7
2.8. Balancing the System........................................................................................................................... 8
3. CONTROLS..................................................................................................................................................................... 9
3.1. Features: ...............................................................................................................................................9
3.2. Machine ON/OFF Switch..................................................................................................................11
3.3 Standard Dehumidistat - Part # DSTAT-1...........................................................................................11
3.4. Windsor Control (Part # WIN-1) .....................................................................................................11
3.5. Windsor Timer (WIN-20)..................................................................................................................11
3.6 Spring Wound Timers ............................................................................................................................ 12
3.7 Remote On/Off Switching ...................................................................................................................... 12
3.8 Furnace Interlock....................................................................................................................................12
4. Arctic Defrost Mode ...................................................................................................................................................... 12
5. START-UP..................................................................................................................................................................... 12
6. OPERATING HINTS.................................................................................................................................................... 13
7. MAINTENANCE .......................................................................................................................................................... 13
7.1. Filters:.................................................................................................................................................13
7.2. Fans .....................................................................................................................................................13
7.3. Condensate Drain ..............................................................................................................................13
7.4. Core.....................................................................................................................................................13
7.5. Exterior Hoods ................................................................................................................................... 13
7.6. Grills & Duct Work ........................................................................................................................... 14
8. ANNUAL SERVICING................................................................................................................................................. 14
9. TROUBLE SHOOTING ............................................................................................................................................... 15
10. ELECTRICAL SCHEMATICS .................................................................................................................................... 16
10.1. WINDSOR Wall Controls Wiring Diagram....................................................................................16
10.2. 24V Standard D-Stat Wiring Diagram (Part#DSTAT-1) ..............................................................17
10.3. Damper Defrost and Re-circulation Defrost ...................................................................................18
11. WARRANTIES.............................................................................................................................................................. 19
Rev. December 19, 2008
1. 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.
2. INSTALLATION
2.1. 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 or oil tanks.
Do not hook 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 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.
2.2. 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.
2.2.1. 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:
Rev. December 19, 2008 Page 3 of 19
• 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.
2.2.2. 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.
2.2.2.1. 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 3.9
2.2.2.2. 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.
2.2.3 The Simplified System
This system uses the furnace's return
duct 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.
Rev. December 19, 2008 Page 4 of 19
2.2.3.1. 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
Section 3.7.
NOTES:
1) When selecting an installation option, consideration should be given to the increased electrical
consumption of the furnace fan.
2) 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).
2.2.4 Installation Supplies, Standard Issue Items
The HRV comes equipped with:
Filters
Anti-Vibration Straps
Heat Recovery Core
Drain Hose Assembly
Connections for timers, remote controls, furnace interlock
2.2.5. Control Options (sold separately)
Windsor mechanical control (WIN-1)
Windsor 20 minute timers -up to 6 each system (WIN-20)
2.3. 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 avoid condensation problems and energy losses.
The minimum RSI value of insulation should equal that of the local building codes.
2.3.1. 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.
Make the insulated duct that connects the weather
Rev. December 19, 2008 Page 5 of 19
CEA15
-R
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.
2.3.1.1. 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. 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.
2.4. 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.
2.5. Port Configurations
1. FROM OUTSIDE - Insulated flex pipe
2. TO SPACE - Non insulated pipe
3. FROM SPACE - Non insulated pipe
4. TO OUTSIDE - Insulated flex pipe
5. DEFROST IN (CEA18 ONLY)
6. DEFROST OUT (CEA18 ONLY)
Rev. December 19, 2008 Page 6 of 19
CEA20-D
Connecting To Other Equipment - Residential Applications
Your Nu-Air HRV is not intended to be connected to other equipment or appliances. Interconnection
with a forced air furnace duct system is permissible; refer to sections 2.2.2 through 2.2.3.1 and section
3.7.
2.6. 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. Install the two balancing dampers (supplied) in the supply air and
return air ducts close to the unit and 12” from an elbow or flow collar.
RECOMMENDATION: Use galvanized duct
whenever possible. Although flexible duct can be used,
its use should be restricted to areas indicated (outside
hoods and unheated spaces).
Ducting must be supported according to the manufacturers
specified hanger system and intervals.
RECOMMENDATION: An engineer or other qualified
person should design the duct system.
2.7. 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 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 speed 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
Rev. December 19, 2008 Page 7 of 19
2.8. Balancing the System
Balanced air flow between the supply and exhaust air streams is essential to the
performance of an HRV. The equipment we recommend for balancing your system is
easy to use, reliable and one of the most cost efficient flow balancing, measuring
systems available.
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.
The forced air furnaces should operate at continuous low speed.
Use set-screws to lock both balancing dampers to the fully open position.
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 NuAir. Depending on the device you are using, follow one of the two procedures below:
Magnehelic Gauge
1. Disengage one end of the exhaust flexible duct connector in the main duct before any branch ducts
and push the duct back into itself. Insert the flow grid and 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. Ensure again that the balancing dampers are fully open. Record reading from gauge. Repeat the
procedure for the supply duct.
4. Go back to the duct with the higher reading and adjust the balancing damper until
the supply air is equal to the exhaust air reading.
Air meter
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 and ensure once again that both balancing dampers
are set in the fully open position with a set-screw.
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.
Rev. December 19, 2008 Page 8 of 19
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
• 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.
Air meter available from Nu-Air wholesalers. (Part #100460)
Balance the HRV in less than five minutes.
3. CONTROLS
Your machine is equipped for remote controls. Options include humidity sensing, off-on control,
intermittent & continuous modes, 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.
3.1. Features:
• Powerful transformer – up to six (6) WIN-20 Timers can be connected in
parallel
• Field selectable defrost cycle for northern applications
• Self-resetting fuse to protect the board against mis-wiring
• Variable low speed control – HRV low speed can be adjusted between a
minimum of 40% and a maximum of 70% of high speed. See below for
explanation.
• Optional setting for 220V/50Hz geographic areas
The following sections outline the 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.
DIP Switches:
An array of four (4) two position switches are located at the top
left corner of the board. The "On" position for each switch is
labeled and corresponds to down (i.e. towards the board surface).
The "Off" position is up or away from the board surface. The
switches are labeled 1-4 and their settings determine the
following conditions.
Rev. December 19, 2008 Page 9 of 19
# 1 Frequency Setting - Set to ON (down) for 60 Hz service. This includes all of North America. Set to
OFF (up), for electrical grids using 50 Hz.
#2 Defrost Type - ON (down) is for damper/recirc. models. OFF (up) is for fan shut down defrost
models.
#3 Fan Selector - OFF (up) is for the NU075 machine only. All other models are set to ON (down).
#4 Arctic Mode Selector - for design temperatures of -30 0C (-22 F) and colder for Damper/recirc.
defrost machines, or design temperatures of –20 0C (-4 F) and colder for FSD defrost machines, set to
Off (up). Otherwise set to ON (down). When the machine is set to operate in arctic mode, the machine
will increase the amount of time spent in defrost.
Variable low-speed motor control:
For field adjustment of the low (continuous) ventilation rate, pushbutton switches S1 & S2 are used.
These are located on the bottom left of the board. S1 is labeled DEC (decrease) and S2 is labeled INC
(increase). Each push of S1 or S2 decreases or increases low speed by increments of 3%. Low speed is
set at 40% of high speed in the factory by default and cannot be lowered beyond this point. The
maximum low speed setting is approximately 70% of high speed. Settings are stored in the board’s
memory, eliminating the need to reset the speed after a power failure for instance.
Self-resetting fuse:
Field mis-wiring of 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.
Troubleshooting using the PCB light:
There is a small green light on the board located just below the DIP switches. This light will either be
solid or pulsing and is an indicator of machine status. It can be used to assist in troubleshooting.
Machine State Light Status
Machine has no power Off
Power to the board, but main power switch is off
or the door switch is tripped
Machine running normally in low speed Pulsing – on for one second, off for one second
Machine running in high speed due to a call from
dehumidistat, timer, or defrost cycle
Defrost Cycles:
Fan Shutdown Defrost – On FSD machines, the temperature sensor is located in the fresh air stream
before the core. When this air is measured to be below freezing, a timed defrost cycle is initiated. The
fresh air fan motor is stopped for 4 minutes (both normal and arctic modes). The exhaust fan motor
continues to operate, drawing warm air from the building through the core. After 4 minutes, the fresh air
fan motor is started again and runs for 20 (normal mode) or 12 (arctic mode) minutes. This cycle is
repeated until the temperature of the exhaust air stream is measured to be above freezing.
Two short pulses approximately every 5 seconds
Solid
Rev. December 19, 2008 Page 10 of 19
|
|
|
COM
Damper Defrost – On damper/recirc. models, the temperature sensor is located in the fresh air stream
before the core. When the outdoor air temperature is measured to be below freezing, a timed defrost
cycle is initiated. The machine runs normally for 36 (normal mode) or 20 (arctic mode) minutes and then
shuts off the fresh air by closing a damper for 4 (normal mode) or 5 (arctic mode) minutes. This timed
cycle repeats until the temperature of the outdoor air is measured to be above 0 C. Note: When the
machine has power but is not turned on the damper automatically closes off the fresh air port to prevent
unwanted drafts while the machine is not in operation.
Change from previous board-versions: When in defrost mode, the fans operate in high-speed. A call from the timer now lasts
20 minutes total, even if the machine is in defrost (previous versions would wait until defrost was complete and then resume
the timer).
3.2. Machine ON/OFF Switch
Switch to the ON position " | " to enable operation of the HRV.
HUM
LED
3.3 Standard Dehumidistat - Part # DSTAT-1
With this standard basic control the system is designed to operate
on a low speed for continuous ventilation with intermittent high
speed for moisture on air quality control. The dehumidistat will
switch the HRV to high speed when the relative humidity of the air
around it exceeds its set point. When the humidity falls below the
set point, the machine drops out of high speed.
INT"
CONT"
SWITCH
24 V
3.4. Windsor Control (Part # WIN-1)
The Windsor Dehumidistat Control incorporates a 3-position switch from which the operator can select
three operating modes.
1. OFF - disables all functions.
2. STANDBY - HRV is on stand-by (intermittent). High speed ventilation on demand from the
dehumidistat, or remote timers. i.e. Auto-Off
3. CONTINUOUS - continuous low speed ventilation. HRV cycles to high speed on demand
from the dehumidistat or timers.
The two position switch:
Constant - locks the motors in High speed
Standard – normal operating mode enables functions 2 and 3 above.
Wires from the control are colour coded as follows: black/HUM, green/INT, yellow/CONT, red/24V
COM. Remove factory installed jumper wire at CONT and 24 V COM. Four-conductor wire is used.
3.5. 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 normal
operating condition.
Rev. December 19, 2008 Page 11 of 19
Up to six (6) timers can be connected in series or parallel. Match terminals on back of switch to
terminals on HRV. "SWITCH", "LED" and "24 V COM (PWR)". When engaged, the HRV will run in
high speed for twenty minutes. Three-conductor wire is needed.
3.6 Spring Wound Timers
Connect to "HUM" and "24 V COM" using two-conductor wire. To select between continuous low
speed operation or intermittent high speed when no other control is being used, use a jumper wire
connection as described in 3.2 above.
3.7 Remote On/Off Switching
Basic RNC type control can be achieved using a standard light
switch. Add a jumper to 24 V COM and CONT for
continuous low speed. For manually switched high speed,
connect a switch between HUM and 24 V COM.
Remote On/Off Switching With Internal Dehumidistat
For continuous low with automatic humidity control, connect the on/off switch to "CONT" and "24V
COM".
3.8 Furnace Interlock
To interlock the furnace blower with the HRV, supply 24 V in and out from
the furnace controls R & G lines to HRV terminals labeled R&G.
NOTE - For a furnace connected to a cooling system: When using the built-in
furnace interlock relay on the HRV in conjunction with certain older mercury bulb
thermostats, energizing the R and G terminals will also cause 24 volts to be sent
through the Y terminal which will initiate the outdoor condenser. If this is the case,
there are two possible solutions. Either upgrade the thermostat to a digital type
which does not have Y connected to G internally, or install the isolation
relay as shown in the wiring diagram at right.
4. Arctic Defrost Mode
A field selectable Arctic Defrost Mode is available on all models and
should be used for temperatures below -20 0C (-4 F) for fan
shutdown defrost models and areas with temperatures reaching
below -30 0C (-22 0F) for damper defrost or recirculation models. Consult Nu-Air Ventilation Systems
Inc. or your nearest wholesaler for more information.
5. START-UP
• Ensure the controls are connected in accordance with Section 3.
• 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.
IN (R) OUT (G)
FURNACE INTERLOCK
Rev. December 19, 2008 Page 12 of 19
6. OPERATING HINTS
Set the dehumidistat at the desired level. Look for signs of excessive humidity or dryness. Let your
windows be your guide. As outdoor temperatures decrease – the comfortable humidity level also
decreases.
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 – On extremely humid days it is best not to run the HRV during the day. At night
turn the machine on high speed using the dehumidistat. This will help keep your home cool and
your basement fresh. In the morning, turn the machine off again. The normal summer setting is 55%
- 75%. Alternatively plug the HRV into an electrical timer set to switch on/off at desired intervals.
7. MAINTENANCE
CAUTION: Disconnect power before servicing.
7.1. Filters:
Dirty filters can reduce ventilation efficiency, result in unbalanced airflow and damage or shorten the
life of the motors. Clean 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.
7.2. 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.
7.3. 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.
7.4. Core
The core (located behind the cover) should be removed and cleaned at least once a
year, using a mild detergent in cold water (i.e. Arctic Power). To remove the cover of
the machine, unlatch the two latches; slide the door to right to release from hinges.
7.5. 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.
Rev. December 19, 2008 Page 13 of 19
7.6. 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.
Rev. December 19, 2008 Page 14 of 19
9. TROUBLE SHOOTING
SYMPTOM EXPLANATION ANSWER
Humidity levels too low.
Humidity levels too high.
House dry/basement wet.
Dehumidistat is not
working.
Frosting up of HRV and/or
Duct(s).
Supply air feels cool.
Outside duct has ice build
up or condensation.
Water in the bottom of
HRV.
Poor air flow(s)
•••• HRV air flows incorrectly balanced.
•••• Dehumidistat control set too low.
•••• Lifestyle of the resident(s).
•••• HRV air flows incorrectly balanced.
•••• HRV not properly sized for the application
•••• High humidity areas not ventilated properly.
•••• Lifestyle of resident(s).
•••• Dehumidistat is not working.
•••• High humidity during summer months
•••• Incorrect connection of outside low voltage
wiring between HRV and Dehumidistat.
•••• HRV air flows incorrectly balanced.
•••• HRV defrost system is not working.
•••• HRV air flows incorrectly balanced.
•••• Improper location of supply grills.
•••• Extremely cold outside temperatures.
•••• Moving air feels cooler than it actually is.
•••• Improperly installed vapour barrier around
insulated duct.
•••• Drain pans are plugged.
•••• Incorrect connections of HRV’s drain lines.
•••• HRV is not level.
•••• Drain lines plugged.
•••• HRV heat exchange core improperly
installed.
•••• HRV airflow incorrectly balanced.
•••• Filters need to be cleaned.
•••• Mesh on outside hoods needs to be cleaned.
•••• Grills are closed.
•••• Inline dampers are closed.
•••• Low power supply.
•••• Wrong-size ducting.
•••• Under-sized HRV.
•••• HRV is not working.
•••• Balance Air Flow(s).
•••• Increase Dehumidistat.
•••• Humidifiers may need to be added.
•••• Balance airflow.
•••• Set dehumidistat.
•••• Cover pools etc. when not in use.
•••• Avoid hanging clothes to dry, storing wood and
venting clothes dryer inside.
•••• Install a programmable timer on 12-hour cycle. On
at night. Off during the day.
•••• Partially close some grills upstairs, open grills in
basement.
•••• Check control wiring for short
•••• Check wall switch for correct connection.
•••• Check wires are connected to proper terminals at the
HRV
•••• Balance HRV.
•••• Install back draft dampers.
•••• Check defrost system.
•••• Note minimal frost build up is expected on cores
before unit initiates defrost cycle function.
•••• Balance HRV.
•••• Locate grills high on walls or in ceiling.
•••• If supply air is installed into return line of furnace,
furnace fan must run continuously on low speed.
•••• Tape all joints.
•••• Ensure that vapour barrier is completely sealed and
insulated.
•••• Look for kinks in the line.
•••• Check water drain connections.
•••• Ensure that water drains from pan.
•••• Tape all joints.
•••• Use proper air flow measuring equipment.
•••• Open grills.
•••• Remove obstructions in duct(s), hoods(s), and
grill(s).
•••• Balance air flows.
•••• Clean filter.
•••• Have a professional look at the system.
IMPORTANT!
QUALIFIED TECHNICIANS SHOULD DO ALL OTHER SERVICING.
Rev. December 19, 2008 Page 15 of 19
10. ELECTRICAL SCHEMATICS
10.1. WINDSOR Wall Controls Wiring Diagram
WIN-20
WIN-1
Rev. December 19, 2008 Page 16 of 19
10.2. 24V Standard D-Stat Wiring Diagram (Part#DSTAT-1)
NOTE: Jumper must be removed if WIN-20 timers are installed
Rev. December 19, 2008 Page 17 of 19
10.3. Damper Defrost and Re-circulation Defrost
Rev. December 19, 2008 Page 18 of 19
11. WARRANTIES
Your NU-AIR Contractor Edition Heat Recovery Ventilator Transferable Warranty
For Canada and United States
Should your NU-AIR Contractor Edition Heat Recovery Ventilator (HRV) cease to function within two
(2) years for models CEA15-R, CEA18-C, CEA20-D of the date of original purchase (effective January,
01, 2007) due to defective material or workmanship of the product, NU-AIR Ventilation Systems Inc.
will supply a new or rebuilt part FOB Factory to replace the defective part. Delivery, installation, and
labour cost would be your responsibility.
Fifteen Year HRV Core Warranty
If the aluminum core in your NU-AIR CEA Series Heat Recovery Ventilator fails due to a defect in
material or workmanship NU-AIR Ventilation Systems Inc. will supply a new core FOB Factory to
replace the defective part. Delivery and labour costs are your responsibility.
Nu-Air warrants its ERV core to be free from manufacturing defects for a period of one year.
Warranty Limitations
The above warranty does not cover damage to the unit while in your possession (other than damages
caused by defective parts or material) due to the following: 1) improper installation or unreasonable use
of unit: 2) failure to provide reasonable and necessary maintenance. If the unit is put to commercial use
or application other than residential use, warranty is for a period of one (1) year.
P.O. Box 2758 Windsor, Nova Scotia Canada B0N 2T0
Phone: 902 798 2261 Fax: 902 798 2557
Email: nuair@nu-airventilation.com Website: www.nu-airventilation.com
Rev. December 19, 2008 Page 19 of 19
IIMMPPOORRTTAANNTT
READ AND FILL OUT REGISTRATION
CARD IMMEDIATELY
THIS IS YOUR WARRANTY REGISTRATION CARD
In order to properly validate your warranty, you must fill
out and return this card. Failure to register unit will
require you to present proof of purchase should the unit
This information provides us the means of proving the
date you purchased the product and also enables us to
notify you in the unlikely event of a service notification
or recall of the product.
IIMMPPOORRTTAANNTT
require service.
LISEZ ET REMPLISSEZ CETTE
CARTE D’INSCRIPTION
IMMÉDIATEMENT
VOICI VOTRE CARTE D’INSCRIPTION DE LA
Afin de valider votre garantie, vous devez remplir et
renvoyer cette carte. A défaut d’inscrire votre produit,
vous devrez présenter une prevue de la date d’achat si
le produit nécessite des réparations.
Les renseignements ci-joints nous fourniront la prevue
de votre date d’achat du produit et nous permettront
également de communiquer avec vous si, pour une raison
fortuite, nous devoins vous faire parvenir un avis de
réparation ou de rappel du produit.
GARANTIE
PPRROODDUUCCTT WWAARRRRAANNTTYY RREEGGIISSTTRRAATTIIOONN
CCAARRTTEE DD’’IINNSSCCRRIIPPTTIIOONN DDEE LLAA GGAARRAANNTTIIEE DDEE VVOOTTRREE
PPRROODDUUIITT
FIRST NAME LAST NAME
NOM DU PRÉNOM ________________________ NOM DE FAMILLE______________________________
ADDRESS
ADRESSE _________________________________________________________________________________
CITY
VILLE ____________________________________________________________________________________
PROVINCE POSTAL CODE DATE PURCHASED
PROVINCE ___________ CODE POSTAL ______________ DATE D’ACHAT __________________
MO/MOIS DAY/JOUR YEAR/AN
TELEPHONE
TÉLÉPHONE (___________) _______________________________________________________________
DEALER’S NAME
NOM DU VENDEUR ________________________________________________________________________
MODEL NUMBER
NO. DU MODÈLE __________________________________________________________________________
SERIAL NUMBER
NO. DE SÉRIE ______________________________________________________________________________
P.O. Box 2758
Windsor, Nova Scotia
Canada B0N 2T0
Ph: 902-798-2261
Fax: 902-798-2557
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