nuair NU2200 Assembly Instructions

Revised February 2015
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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 I IN NS ST TR RU UC CT TI IO ON NS S
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FO OR R N NU U- -A AI IR R N NU U2 22 20 00 0
H HE EA AT T/ / E EN NE ER RG GY Y R RE EC CO OV VE ER RY Y V VE EN NT TI IL LA AT TO OR RS S
* LEAVE THIS DOCUMENT WITH THE BUILDING OWNER
Specifications, dimensions and ratings may change without notice
as a result of ongoing product development and improvements.
NU2200
P.O. Box 2758 Windsor, Nova Scotia, B0N 2T0
Ph. 902 798 2261 Fax. [phone]
www.nu-airventilation.com Email: [e-mail]

Revised February 2015
TABLE OF CONTENTS
1 HOW THE NU-AIR SYSTEM WORKS...................................................................................................... 3
2 DEFROST .................................................................................................................................................. 3
3 OPERATING INSTRUCTIONS................................................................................................................. 3
3.1 Control Options ......................................................................................................................4
3.2 Disconnect ............................................................................................................................... 4
3.3 Defrost Adjustments ...............................................................................................................4
4 MAINTENANCE........................................................................................................................................ 4
4.1 Filters ......................................................................................................................................4
4.2 Fans (FC DWDI 810 - belt drive) ...........................................................................................4
4.3 Motors (2 x 1.5 hp – single speed)...........................................................................................4
4.4 Condensate Drain ...................................................................................................................5
4.5 Cores ....................................................................................................................................... 5
4.6 Exterior Hoods........................................................................................................................5
4.7 Diffusers and Ductwork..........................................................................................................5
4.8 Belts.........................................................................................................................................5
5 ANNUAL SERVICING .............................................................................................................................. 6
6 INSTALLATION INSTRUCTIONS ........................................................................................................... 6
6.1 Installer’s Responsibilities ...................................................................................................... 6
6.2 Installation Basics ...................................................................................................................6
6.3 Ducting from the Weather Hoods ..........................................................................................7
6.4 Weather hoods ........................................................................................................................ 7
6.4.1 Locating the Weather Hoods ........................................................................................................ 7
6.5 Port Configurations ................................................................................................................ 8
6.6 Mounting and Noise Control ..................................................................................................8
6.6.1 Fastening Nu-Air Commercial H/ERV's in place: ......................................................................... 8
6.7 Connecting To Other Equipment...........................................................................................8
6.8 Ductwork.................................................................................................................................8
6.9 Drain Connections ..................................................................................................................9
6.10 Balancing the System ....................................................................................................... 10
7 ELECTRICAL POWER & CONTROLS................................................................................................... 10
7.1 Electrical Schematics ............................................................................................................ 11
7.2 Electrical Parts List .............................................................................................................. 14
7.3 Component Layout ............................................................................................................... 14
8 SPECIFICATIONS .................................................................................................................................. 15
9 WARRANTY:............................................................................................................................................ 16

Nu-Air Ventilation Systems Inc. - HRV Operating &Installation Manual
Revised April 27, 2012 Page 3 of 17
1HOW THE NU-AIR SYSTEM WORKS
Heat Recovery Ventilator (HRV) – Sensible only heat recovery with polypropylene fixed plate
heat exchange core.
Energy Recovery Ventilator (ERV) – Sensible and latent energy recovery with
aluminum/polypropylene fixed plate enthalpy recovery exchange core.
The NU1824 HRV or ERV provides fresh air to a conditioned space while exhausting an equal
amount of stale air. Heat only or total energy is transferred from one air stream to the other
within a fixed plate exchange core.
A belt driven blower is used to supply fresh air and a second belt driven blower to exhaust stale
air from the space.
Incoming fresh air is filtered before flowing through the heat recovery core.
Stale, humid air flows through the heat recovery core and transfers the heat to the incoming fresh
air.
Warm fresh air is distributed through an independent ductwork system or an existing air
distribution system.
2DEFROST
NU1824 H/ERV’s are supplied with an automatic defrost system. Two defrost methods are
available:
Timed fan shut down defrost: A temperature sensor shuts down the supply fan when the
outside air is cold enough to freeze condensate. The supply fan remains off for a set length of
time. The supply fan resumes normal operation for a set length of time and the cycle repeats as
long as the outside air temperature is below the set point. Both defrost and run cycles are field
adjustable via the unit’s control.
Temperature fan shut down defrost: The exhaust air after the core is monitored. When below
freezing, a defrost cycle is activated. The supply fan shuts down while the exhaust fan continues
to move warm air through the core. When the exhaust air rises above 7 0C (45 0F) the HRV
reverts to exchange mode.
3OPERATING INSTRUCTIONS
The H/ERV motors are controlled and protected by a multi-starter that has an on-off speed
switch. A factory installed non-fused disconnect switch is mounted on the unit near the starter.
An optional remote station can be used for 24 V control of the HRV from a central location.

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3.1 Control Options
A local On/Off switch is supplied with the unit. Provision is made for remote switching. Any
customer supplied switch will work. Control voltage is 24 VAC.
An optional end switch/interlock can be supplied at the time of ordering.
3.2 Disconnect
The unit comes complete with a 25 Amp non-fused disconnect.
3.3 Defrost Adjustments
Temperature Fan Defrost – clockwise rotation is cooler (less defrost)
Timed Fan Defrost – increase the ON time or decrease the OFF time for more defrost. Decrease
the On time or increase the OFF time for less defrost.
4MAINTENANCE
NOTE: Disconnect power before servicing.
4.1 Filters
Dirty filters can reduce ventilation efficiency, resulting in unbalanced airflow and damage or
shorten the life of the motors. Check at least every three months and replace yearly or when
necessary depending on indoor and outside air conditions.
Fresh Air Filter - 16" x 24" x 1" quantity of 2; MERV 8
Exhaust Air Filter - 12" x 24" x 1" quantity of 2; MERV 8
Nu-Air recommends a spare set (4 pcs) of filters be ordered with the H/ERV for maintenance
stores.
4.2 Fans (FC DWDI 810 - belt drive)
When inspecting the filters, take the opportunity to vacuum any interior surfaces including the
fan blades.
4.3 Motors (2 x 1.5 hp – single speed)
The motors are equipped with permanently sealed and lubricated bearings.

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4.4 Condensate Drain
Wipe clean the condensate drain pan every six months. 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.
4.5 Cores
The HRV polypropylene cores (2 cross-flow exchangers) should be removed and cleaned at least
twice a year using a non-corrosive enzyme detergent in cold water. In some applications, e.g.
smoking rooms, more frequent cleaning with alternative detergents is suggested.
The ERV polymer membrane cores are washable in cold water. Remove core(s) from the
cabinet twice annually and rinse with fresh water to remove any
contaminants that pass through the filters.
Do not use high pressure water supply.
A mild non-corrosive enzyme detergent can be utilized if desired.
4.6 Exterior Hoods
Regularly check the outside vents and clear 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. Ensure leaves, lawn clippings, snow and
frost do not build up and restrict or block openings.
4.7 Diffusers and Ductwork
Clean the diffusers with soap and water when they are dusty or otherwise
noticeably dirty. Exhaust diffusers require more frequent cleaning than
supply diffusers.
4.8 Belts
The standard belt supplied with this unit is B36.
The belts should be regularly inspected for tension, wear, etc. at regular intervals. A belt
maintenance guide has been included at the back of the manual. Nu-Air recommends a spare set
of belts be purchased with the HRV for maintenance stores.

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5ANNUAL SERVICING
Your HRV/ERV should undergo annual general servicing by an accredited contractor. This
servicing should include the following:
The eight maintenance items above (3.1 - 3.8).
1. A general check for proper operation. Controls and electrical connections should be
inspected.
2. Verification that intake and exhaust airflows are properly balanced.
3. Re-balancing as necessary.
6INSTALLATION INSTRUCTIONS
6.1 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 locate the fresh air supply near a source of contaminated air such as automotive
exhaust, gas or propane exhaust or oil tanks.
Combustion appliances such as furnaces and hot water heaters must not draw combustion
air directly from an H/ERV.
6.2 Installation Basics
Before installing a Nu-Air Commercial H/ERV for the first time, please read these instructions.
Standard Issue Items
The H/ERV comes equipped with:
Filters
Core
Drain kit
Controls (if ordered)

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Other Basic Needs (by others)
Galvanized Duct
Flexible Duct Connector
Outside Hoods (2)
Duct Fittings
Duct Tape & sealer
Screws
Diffusers
Duct Hanger
Balancing dampers
Isolation and installation fasteners
6.3 Ducting from the Weather Hoods
Between the weather hoods and the H/ERV it is recommended to use rigid rectangular ducting
equal to or larger than the collar size of the machine. These ducts should be wrapped with an
insulating duct wrap. The minimum RSI value of insulation should equal that of the local
building codes.
6.4 Weather hoods
Designers should try to locate the hoods in such a way that there is easy access for cleaning
purposes. If the H/ERV can be located close to the outside wall(s) containing the hoods, the
resulting short duct lines will minimize airflow restrictions.
6.4.1 Locating the Weather Hoods
There should be maximum separation between the fresh air and exhaust hoods. Supply hoods
should be a minimum of 36” (inches) above the ground level. Exhaust hoods should be at least
24" (inches) above the ground level. Fresh air hoods must be min. 10’ 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 re-introduction 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.

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6.5 Port Configurations
1 3
C
4 2
3 1
G
2 4
1 – outside air 2 – supply air 3 – return air 4 – exhaust air
All duct connections are 24”x12”.
6.6 Mounting and Noise Control
For maximum efficiency, the H/ERV should be installed in a heated area.
6.6.1 Fastening Nu-Air Commercial H/ERV's in place:
The unit is intended to be floor mounted using typical HVAC isolation methods, such as
anchoring bolts and compression springs or a suitable equivalent.
Suspension mounting (by others) using threaded rod, “U” channel, and vibration isolation is
permissible, ensure rods do not obstruct access for maintenance and service.
Flexible duct connector (PRO flex or other) should be used at all four collars of the HRV to
isolate vibration.
6.7 Connecting To Other Equipment
If the HRV is used upstream of an airhandler or similar equipment (fresh air into economizer
section e.g.), the start up sequence must be HRV first followed by the airhandler. If the
airhandler is started first, the HRV's fresh air fan will rotate backward, and the motor may not be
able to overcome the extra load causing an over amp situation.
6.8 Ductwork
Duct runs should be straight with minimum bends and elbows. Joints should be tight fitting and
sealed with high velocity, fiber reinforced duct sealant or good quality duct tape.

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RECOMMENDATION: An engineer or other qualified person should design the duct
system.
Ducting must be supported according to the designer's specified hanger system and intervals.
6.9 Drain Connections
Access to a drain is required to handle the HRV condensate. Care should be taken to run the
condensate tube where it will not freeze.
For best results, Nu-Air recommends the following steps be followed when installing drain kits.
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 fitting (F) as shown in the drawing 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

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6.10 Balancing the System
Balanced airflow between the supply and exhaust air streams is essential to the performance of
an HRV.
The pulleys used on the supply and exhaust fans are a split type pulley that allows some field
adjustment of the fan rpm and corresponding air flow. Adjust the pulley in ½ turn increments.
Close to increase rpm, open to decrease rpm.
Once the HRV system is installed, do the following:
•Close all windows and doors.
•Turn off any exhaust only systems.
To balance the HRV, set the machine on high speed.
•Make a small hole in the supply duct at least 10 feet downstream of the fan. Insert a Pitot
tube in the cross sectional center of the duct.
•Measure the pressure with a digital manometer or magnehelic gauge.
•Record the value and repeat the procedure for the exhaust air stream.
•Install a balancing damper in the air stream with the greater flow and damper back until
the pressure equals that of the opposite air stream.
7ELECTRICAL POWER & CONTROLS
For electrical hook-up, the HRV should be connected to a power source of voltage and phase
indicated on the name plate and according to applicable local electrical codes.

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7.1 Electrical Schematics
Single Phase Timed Fan Defrost

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Single Phase Temperature Fan Defrost

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3 Phase Fan Defrost

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7.2 Electrical Parts List
7.3 Component Layout
Item Description Part # Quantity
M1, M2 Contactor J7KN-10-10 24 2
CB1, CB2 Circuit Breaker J7MN-12-10 2
Transformer 240/24-20VA BD5G 2
T1 Terminal Block SAK6 7
T2 Terminal Block SAK4 2
Defrost Thermostat VB-11 1
MTR 1.5 hpMotor C1160 2
S1 Selector Switch OHY3PH 1
Disc Disconnect OT30ET3 1
F1 1A Glass Fuse 312-1A 2
S2 Selector Switch PB-BD 1
S2 Contact Block PB-BE101 2
S2 Mounting Collar PB-B 1
F1, F2 Fuse Holder 18804300G0 2
F1, F2 Fuse Holder End Plate 18804500G0 2
Ground Terminal 1
Din Rail 10"
Din Rail 7"
Terminal Block End Plate 2
Ground Lug 1
20 Ga Galv Plate 12"x15"
Din Rail End Stop 6
BOM

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8SPECIFICATIONS
Nominal Airflow @ 1327 rpm 2200 cfm @ 1” ESP
Motor Horse Power/speeds/rpm 2 @ 1.5 hp/1 sp/1725
Unit FLA 16.4
Blower Pulley Maska MBL37
Motor Pulley Maska MVL34x5/8
Bushing Maska Hx3/4
Blower DWDI FC 810
Duct Connections 24x12

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9WARRANTY:
NU-AIR COMMERCIAL HRV's
Nu-Air warrants its Commercial HRV's to be free from defects on all components including
motors, circuit boards, transformers, and switches when subject to normal and proper use for a
period of two (2) years from the date of purchase.
Fifteen (15) year warranty on HRV polypropylene cores
Five (5) year warranty on ERV polymer cores.
Should a manufacturing defect occur during the warranty period, Nu-Air will supply replacement
parts FOB our plant at no charge. Labour costs to remove and reinstall these parts are not
covered under this warranty.
This warranty is expressly in lieu of all other warranties or obligations and in no event shall Nu-
Air be liable for consequential or incidental damages of any kind, including damage to the
building, its contents or any person therein.
Earl Caldwell
President
P.O. Box 2758, Windsor, Nova
Scotia Canada, B0N 2T0
Phone: [phone] Fax: [phone]
Email: [e-mail] Website: www.nu-airventilation.com

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