Lifebreath Ventilation Hood 2500EFD User Manual

OPERATION AND  
INSTALLATION MANUAL  
For Models:  
IMPORTANT - PLEASE READ THIS  
MANUAL BEFORE INSTALLING UNIT  
2500IFD  
2500EFD  
CAUTION  
Before installation, careful consideration must be given to  
how this system will operate if connected to any other piece  
of mechanical equipment, i.e. a forced air furnace or air  
handler, operating at a higher static. After installation, the  
compatibility of the two pieces of equipment must be  
confirmed by measuring the airflow’s of the Heat Recovery  
Ventilator (HRV) Energy Recovery Ventilator (ERV) by  
using the balancing procedure found in this manual.  
It is always important to assess how the operation of any  
HRV/ERV may interact with vented combustion equipment  
(ie. Gas Furnaces, Oil Furnaces, Wood Stoves, etc.).  
NEVER install a ventilator in a situation where its normal  
operation, lack of operation or partial failure may result  
in the backdrafting or improper functioning of vented  
combustion equipment!!!  
TO BE COMPLETED BY CONTRACTOR AFTER INSTALLATION  
Installing Contractor  
Telephone / Contact  
Serial Number  
Installation Date  
Model  
* LEAVE FOR HOMEOWNER  
NOTE: Due to ongoing research and product development, specifications,  
ratings and dimensions are subject to change without notice.  
TI-59  
1203  
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Selecting the Correct Size HRV  
Commercial and Institutional Requirements  
For outdoor air requirements, ASHRAE has produced the Ventilation Standard 62-1989  
that is used to determine acceptable ventilation rates. This standard is referenced directly or  
used as “Good Engineering Practice” in most Code documents or design criteria.  
Small restaurants, Donut Shops and Fast food stores  
Bank  
Seats  
40  
5
Customers  
Staff  
25  
9
Employees  
Total  
45  
Total  
34  
ASHRAE requirement  
Ventilation required  
20 cfm (10 L/s) per person  
45 x 20 = 900 cfm (450 L/s)  
ASHRAE requirement  
Ventilation required  
20 cfm (10 L/s) per person  
34 x 20 = 680 cfm (320 L/s)  
Bar or Tavern  
Bingo Hall  
Seats  
50  
7
Customers  
Staff  
180  
20  
Employees  
Total  
57  
Total  
200  
ASHRAE requirement  
Ventilation required  
30 cfm (15 L/s) per person  
ASHRAE requirement  
Ventilation required  
30 cfm (15 L/s) per person  
57 x 30 = 1710 cfm (855 L/s)  
200 x 30 = 6000 cfm (3000 L/s)  
Classroom and School Portables  
Print Shop, Duplicating  
Seats  
29  
1
Square footage of shop  
2000 square ft  
Teacher  
Total  
ASHRAE requirement  
Ventilation required  
Swimming Pools  
0.5 cfm / ft2 (2.5 L/s - m2)  
30  
ASHRAE requirement  
Ventilation required  
15 cfm (7.5 L/s) per person  
30 x 15 = 450 cfm (255 L/s)  
2000 x 0.5 = 1000 cfm (500 L/s)  
Beauty Salon  
Refer to “Pool” Models Installation Manuals.  
Customers  
Employees  
Total  
12  
6
18  
ASHRAE requirement  
Ventilation required  
25 cfm (12.5 L/s) per person  
18 x 25 = 450 cfm (255 L/s)  
MAKE UP HEAT REQUIREMENT at 1200 CFM (566L/s)  
Nominal  
Nominal  
Nominal  
Outdoor Temp.  
kW Req. for  
20°C (68°F)  
Air Delivery  
kW Req. for  
25°C (77°F)  
kW Req. for  
30°C (86°F)  
C°  
F°  
Air Delivery  
Air Delivery  
0
-10  
-20  
-30  
-40  
32  
14  
-4  
-22  
-40  
7
10  
14  
15  
19  
21  
14  
17  
19  
22  
24  
10  
12  
15  
17  
3
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Model 2500IFD  
SPECIFICATIONS  
AIR FLOW  
2100 cfm (985 L/s) at 1.0"wg ESP  
Supply from Outside  
4" Filters  
PERFORMANCE  
70% effective at 2500 cfm (1172 L/s)  
Exhaust to Outside  
CORE  
Modular aluminum sensible heat recovery core.  
Plate-to-plate type. Slides out of either side of cabinet for  
service.  
MOTORS  
Motors (2)  
Two single shaft PSC, 3-speed, 208/230V,5.1 amps,  
1 ph, 1 hp  
Exhaust from Building  
BLOWERS  
Two direct-drive centrifugal blowers, one per air stream.  
Heat Exchange Core  
Drain Pans (2)  
FILTERS  
Supply to Building  
Two 18" X 24" 4-inch pleated filters in each air stream.  
DUCT CONNECTIONS  
Four 24" X 16" (610mm X 406mm)  
CABINET  
Electrical  
Service  
Panel*  
Heat  
Exchanger  
Service  
Filter  
Service  
Panel*  
20 gauge powder coated galvanized steel (G60) for  
superior corrosion resistance. 16 gauge galvanized  
frame, insulated with1.5" fibreglass insulation to prevent  
condensation.  
47"  
Panel*  
DRAIN  
Two stainless steel drain pans with 1/2" NPT drain  
spouts.  
89.9"  
SIDE VIEW  
MOUNTING  
Unit to be set on support brackets hung by threaded rod  
type apparatus. Brackets and rod not provided.  
*NOTE: Removable service access panels on both sides of 2500IFD cabinet.  
CONTROLS  
Supply from  
24V terminal strip inside electrical box, to connect  
optional remote controls (not included), obtain on/off and  
high/low functions.  
outside  
2"  
38.4"  
24"  
38.4"  
24"  
Exhaust to  
outside  
DEFROST  
Factory set defrost time (user adjustable).  
Supply motor is shut off while exhaust air defrosts core.  
7"  
47"  
WARRANTY  
15 year warranty on heat exchanger, and 2 years  
on parts.  
Supply to  
building  
16"  
16"  
6"  
WEIGHT  
700 lbs.  
Exhaust from  
building  
SHIPPING WEIGHT  
1100 lbs.  
FRONT VIEW  
BACK VIEW  
All units conform to CSA and UL standards.  
DATE: ______________________________________________PROJECT: ______________________________________  
MECHANICAL CONTRACTOR: _________________________________________________________________________  
TI-91I  
1203  
4
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Model 2500EFD  
(ROOFTOP)  
SPECIFICATIONS  
AIR FLOW  
2100 cfm (985 L/s) at 1.0"wg ESP  
Exhaust  
Hoods  
PERFORMANCE  
70% effective at 2500 cfm (1172 L/s)  
Supply Hoods  
Hoods (2)  
c/w Bug Screen  
CORE  
Modular aluminum sensible heat recovery core.  
Plate-to-plate type. Slides out of either side of cabinet  
for service.  
4" Filters  
MOTORS  
Two single shaft PSC, 3-speed, 208/230V,5.1 amps, 1 ph,  
1 hp  
Motors (2)  
Roof Curb  
BLOWERS  
Two direct-drive centrifugal blowers, one per air stream.  
Exhaust Duct  
24"x16"  
FILTERS  
Two 18" X 24" 4-inch pleated filters in each air stream.  
Heat Exchange Core  
Drain Pans (2)  
DUCT CONNECTIONS  
Supply Duct  
24"x16"  
Four 24" X 16" (610mm X 406mm) to and from the building  
under cabinet. Four 28" X 18" (711mm X 457mm) hoods  
included on side of cabinet with screens.  
*NOTE: Roof curb is one inch smaller than outside dimensions of cabinet.  
CABINET  
20 gauge powder coated galvanized steel (G60) for  
superior corrosion resistance. 16 gauge galvanized  
frame, insulated with 1.5" fibreglass insulation to pre-  
vent condensation.  
Electrical  
Service  
Panel*  
Heat  
Filter  
Service  
Panel*  
18"  
27"  
Exchanger  
Service  
Panel*  
47"  
DRAIN  
18"  
Two stainless steel drain pans with 1/2" NPT drain  
spouts.  
MOUNTING  
89.9"  
Rooftop mounted on optional roof curb (Part No. 53-  
2500)  
SIDE VIEW  
CONTROLS  
*NOTE: Removable service access panels on both sides of 2500EFD cabinet.  
24V terminal strip inside electrical box, to connect  
optional remote controls (not included), obtain on/off  
and high/low functions.  
44.95"  
8" 8"  
44.95"  
8" 8"  
21.8"  
25"  
Hood  
Hood  
DEFROST  
Factory set defrost time (user adjustable).  
Supply motor is shut off while exhaust air defrosts core.  
Bottom duct  
connections  
16" X 24"  
12"  
12"  
12"  
12"  
38.4"  
28"  
WARRANTY  
15 year warranty on heat exchanger, and 2 years on  
parts.  
Centre  
Point  
19.2"  
WEIGHT  
700 lbs.  
Stale Air  
Return  
Fresh Air  
Supply  
89.9"  
SHIPPING WEIGHT  
1100 lbs.  
BOTTOM VIEW  
OPTIONAL CURB  
WEIGHT 50 lbs.  
All units conform to CSA and UL standards.  
DATE: ____________________________________________PROJECT: ________________________________________  
MECHANICAL CONTRACTOR: __________________________________________________________________________  
TI-91E  
1203  
5
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Performance  
AIRFLOWS (Each Air Stream)  
HIGH SPEED  
1316 (2800)  
1175 (2500)  
1034 (2200)  
893 (1900)  
752 (1600)  
611 (1300)  
470 (1000)  
329 (700)  
MEDIUM SPEED  
LOW SPEED  
188 (400)  
47 (100)  
400 425 450 475 500 525 550  
25 50 75 100 125 150 175 200 225 250 275 300 325 350 375  
(0.1) (0.2) (0.3) (0.4) (0.5) (0.6) (0.7) (0.8) (0.9) (1.0) (1.1) (1.2) (1.3) (1.4) (1.5) (1.6) (1.7) (1.8) (1.9) (2.0) (2.1) (2.2)  
EXTERNAL STATIC PRESSURE IN PASCALS (in. W.C.)  
TEMPERATURE EFFECTIVENESS  
70%  
60%  
50%  
NOTE: Exhaust Relative Humidity (RH) at 40%  
850  
944  
1039  
1133  
1228  
1322  
1416  
(1800)  
(2000) (2200) (2400) (2600) (2800) (3000)  
AIRFLOW IN L/s (CFM)  
Roof Curb (optional)  
Part No. 53-2500  
Options and Accessories  
99-101: CRANK TIMER  
Supply air  
opening  
Duct Collar Supports  
Mechanical timer to activate high speed.  
99-116: DEHUMIDISTAT VENTILATION CONTROL (DVC)  
Turns unit on/off via slider switch and high/low via built-in  
dehumidistat.  
Factory installed  
perimeter wooden  
nailer strip  
Return air  
opening  
99-130: DEHUMIDISTAT  
Activates high speed when indoor humidity  
rises above set point on control.  
8" 8"  
8" 8"  
25"  
21.8"  
99-140: 4" TECHGRILLE  
99-141: 5" TECHGRILLE  
99-142: 6" TECHGRILLE  
99-148: 8" TECHGRILLE  
Round, white, step-type diffusers.  
Bottom duct  
connections  
16" X 24"  
12"  
12"  
12"  
12"  
36.5"  
Centre  
Point  
Stale Air  
Return  
53-2500: OPTIONAL ROOF CURB  
Supports HRV on roof and connects  
HRV to ducting below.  
88.5"  
Fresh Air  
Supply  
TOP VIEW  
0.7"  
WEIGHT: 50lbs  
Information about design-built electric make-up heat  
coils available upon request.  
14"  
SIDE VIEW  
6
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Installation Tips  
Operation Instructions  
1. Whichever method is chosen to operate the  
2500, keep in mind that Air-to Air exchangers  
in general are not "booster fans" and are  
normally sized to ventilate at a steady rate.  
The LIFEBREATH 2500 series HRV is designed  
tobe operated continuously or intermittently to meet  
the requirements of the application.  
Continuous Operation  
To achieve optimum performance from the  
2500, the desired ventilation rate (speed of  
the system) should be reached before the  
contaminant to be removed has reached  
its maximum.  
For continuous operation, a simple jumper across  
the ON/OFF and COMMON jumper terminals is  
needed. HIGH/LOW speed selection requires  
another jumper across HIGH/LOW and COMMON;  
select as required (see below and wiring diagram).  
EXAMPLE: A bingo hall opening at 7:00PM that is  
sized for 5000 cfm should have at least this amount  
of air exchange by that time. If the unit is not turned  
on or set to its designated speed until after the con-  
taminant has reached an uncomfortable level, then  
T3 - On/Off  
it may result in  
passing before the system could catch up.  
a
number of hours  
ON/OFF  
T2 - High/Low  
2. It is highly recommended that back draft  
dampers be installed in the supply and  
exhaust duct work to the outside, to prevent  
air from entering in through the HRV when the  
unit is off. Failure to install back draft  
HIGH/LOW  
T1 - Common  
Low Voltage-24VAC  
dampers may result in damage to HVAC  
equipment and/or other building components.  
Internittent Operation  
Due to variance in the times in which buildings are  
occupied and equipment or machinery operated,  
intermittent ventilation may be the preferred  
method.  
Dry contacts located inside the electrical panel  
enable this unit to turn ON and OFF, and/or jump  
between HIGH and LOW speeds when optional low  
voltage controls are connected (see above and  
pg. 9).  
Optional Remote Controls  
Basic controls such as dehumidistats, mechanical  
crank timers, 24-hour timers or toggle switches can  
be used to control the unit (see pg. 9).  
7
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Optional Remote Controls  
DEHUMIDISTAT VENTILATION CONTROL*  
ON  
LOCATION: Spa or pool area, anywhere that humidity  
T
A
T
IS  
ID  
M
U
H
E
D
is a concern. (connect 1/unit only)  
• Ventilation control turns HRV system OFF and ON.  
• Dehumidistat increases ventilation when required  
• High speed override switch  
Red - common / Black - hi/low / Orange - on/off  
PART NO. 99-116 c/w 3 wire cable 60' (18m)  
OFF  
HIGH  
REMOTE DEHUMIDISTAT  
Supplied  
and Installed  
by Contractor  
LOCATION: Spa or pool area, anywhere that humidity  
is a concern.  
• Provides high speed ventilation when humidity level  
exceeds selected setting.  
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PART NO. 99-130  
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CRANK TIMER  
Provides high speed ventilation as required.  
Crank Timer - 60 minute  
PART NO. 99-101  
Off  
10  
20  
30  
ON/OFF  
60  
40  
50  
HIGH/LOW  
COMMON  
User Adjustable Defrost  
Defrost timer device  
Yellow  
(see wiring diagram  
for location)  
OPERATION  
Once the snap disk senses temperatures below  
-3˚C (27˚F), it will activate the defrost mode,  
which begins with the Defrost OFF cycle, and  
then continues into the Defrost ON cycle.  
I
ON  
OFF  
Yellow (outer dial)  
0.4 0.6  
adjusts length of time  
between defrost cycles  
(OFF cycle)  
0.2  
0.8  
Orange  
0
1.0  
hrs  
ON  
OFF  
Orange (center dial)  
adjusts time spent in  
defrost mode  
(ON cycle)  
Factory pre-set dial positions  
DO NOT ADJUST  
EXAMPLES OF DEFROST CYCLES  
Factory pre-set defrost  
cycle and time are:  
DEFROST ON  
32ºF (0ºC)  
No defrost required  
=.15 HR. (10 mins)  
DEFROST OFF  
=.50 HR. (30 mins)  
13ºF (-11ºC)  
-40ºF (-40ºC)  
10 mins. defrost ON - 30 mins. defrost OFF  
15 mins. defrost ON - 30 mins. defrost OFF  
8
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If the air temperature is too low the defrost time may  
need to be increased. The unit must be mounted level  
(horizontal) to obtain proper drainage of water from the  
heat exchange cores and drip pans.The warranty will be  
void if these conditions are not met.  
Fan Defrost  
The Models 2500IFD and 2500EFD are equipped with  
an electronically controlled fan defrost system to remove  
frost that collects on the warm air side of the aluminum  
heat transfer surfaces of the heat exchanger core.  
When the outside temperature drops below 27˚F(-3˚C),  
a defrost timer is activated which provides for an auto-  
matic defrost cycle. During the automatic defrost cycle,  
the fresh air supply is shut off while the exhaust fan  
continues to operate. Both the times between defrost  
cycles and the length of time spent in defrost are  
adjustable (see pg. 9 for details). This allows warm  
inside air to flow over the heat exchanger core, melting  
any frost accumulation. After the defrost period, the  
fresh air supply fan automatically returns to the normal  
speed and fresh outside air continues to be drawn into  
the building. Water from the melted frost collects in the  
bottom drip pans and drains out through the bottom  
drain connections. The defrost cycle repeats automati-  
cally until the air temperature rises above 27°F (-3°C).  
Typically, the HRV is positioned close to an outside wall or  
the roof to simplify the connections and keep the length of  
insulated ducting to a minimum.  
A minimum clearance of 40 in. (1 m) on one side of the  
HRV is recommended to service the heat exchanger  
cores and the filters.  
Mounting  
The 2500EFD is designed to be mounted on a roof curb.  
When assembling the curb, note position of cross  
members which provide duct support. Note access  
through the roof will be required.  
It is also important to ensure that the perimeter of the  
curb is insulated, but the interior of the curb is not. This  
allows heat from the building to prevent freezing of the  
drain lines and pans.  
Location  
The 2500EFD is designed to be mounted outdoors, usual-  
ly fastened to a roof curb assembly. Special care and  
attention should be given to positioning the cross mem-  
bers of the roof curb, so that they line up exactly with the  
duct openings on the HRV (see pg. 7). The 2500IFD  
must be located in a heated space where the surrounding  
air temperature does not fall below freezing point. The  
exhaust air temperature must be above 60˚F (16˚C) for  
proper defrost operation.  
The 2500IFD should be hung by a threaded rod  
type assembly which provides a cradle for the unit  
(see pg. 11). Note that 2X4's should sit under the unit to  
avoid damage to the lip of the cabinet. The HRV may  
also be mounted on an equipment platform provided that  
the drain hoses are clear and there is sufficient space for  
service access.  
CORE  
BLOWER  
FRESH AIR  
FROM OUTSIDE  
STALE AIR  
TO OUTSIDE  
MOTORS  
FILTERS  
STALE AIR  
FROM INSIDE  
FRESH AIR  
TO INSIDE  
DRAIN PANS  
BLOWER  
P-TRAP  
9
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Mounting the 2500  
2500IFD  
Saddle mount (not provided)  
Threaded rods  
* NOTE: When installing your  
®
Lifebreath HRV, flexible  
duct connectors should be  
installed between the HRV  
and the galvanized ductwork  
2500IFD  
Platform mount (not provided)  
2 X 4 under unit and  
on top of hanging bracket  
to prevent weight of unit from  
being put on lip of cabinet  
U channels  
Lip  
Hang unit with threaded rods and U channel members.  
2500EFD  
Roof mount  
Vibration isolators  
May be anchored to floor,  
leaving space for drain connections.  
Mount unit on wooden or metal support  
assembly. Unit must be raised an adequate height  
for installation and slope of drain lines.  
Roof curb  
NOTE: Roof curb is one inch smaller than outside  
dimensions of cabinet  
10  
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Roof Curb Assembly Instructions  
FRAME ASSEMBLY  
Roof Curb Assembly  
1. Take one end piece (locking tabs) and one side  
piece (slots). Stand both pieces vertically on the floor  
or roof. See Figure 1.  
Figure 1  
2. Raise slightly the corner of the end piece (locking  
tabs) and mate with side piece (slots), ensuring that  
lower locking tab with leading edge is through slot  
opening. See Figure 2.  
3.Push down on top edge of end piece. Ensure that all  
3 of the locking tabs are feeding into each correspond-  
ing slot. Once both pieces are flush, the process is  
complete. See Figure 3.  
side piece  
slot for tab  
end piece  
locking tab  
4. Drive one spike provided into wood nailer strips at  
each corner. See Figure 3.  
Figure 2  
FRAME APPLICATION AND LOCATION  
This roof mounting frame provides necessary support  
when the unit is installed. The frame can be installed  
directly on deck having adequate structural strength or  
on roof supports under deck.  
wood nailer strip  
wood nailer strip  
SECURING THE FRAME  
side piece  
slot for tab  
To ensure proper mating with unit, it is critical that  
mounting frame be squared to the roof, as follows:  
end piece  
locking tab  
1. With frame situated level in desired location on roof  
trusses, tack weld one corner of frame.  
Figure 3  
2. Measure frame diagonally from one corner to the  
opposite corner. Repeat with the remaining two cor-  
ners. These dimensions must be equal for the frame  
to be square.  
3. It is extremely important to sight frame from all cor-  
ners to ensure that the frame is not twisted across top  
side. Shim frame under any low sides.  
wood nailer strips  
spike  
4. After frame has been squared, straightened and  
shimmed, weld or attach frame securely to roof.  
MAX. SLOPE TOLERANCE: 1/16" per linear  
foot in any direction.  
tabs through slots  
Note specification of duct location on bottom of  
HRV when positioning cross members (duct cavity).  
11  
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NOTE: It is extremely important to design and install  
the fresh air intake in an area where the hoods will  
gather the freshest air, free from restriction.  
Recommended:  
Drains  
Connect the stainless steel drain pans in the bottom of  
the HRV to a drain line fastened to the holes provided.  
See pg.10 for location of the drain pans and the drain  
connections. Create a "P" trap to prevent odours from  
being drawn through. Make sure the drain line slopes  
down to drain properly and if this is not possible a con-  
densate pump will be required for removal of the water.  
Note that stagnant water is a leading cause of indoor  
air quality problems; confirm drainage after installation  
by pouring water into trays. Drain line must be installed  
where it will not freeze.  
• no less than 10 ft. (3 m) apart from each other  
• at least 18 in. (46 cm) above ground level  
• away from sources of contaminants, such as  
automobile exhaust fumes, gas meters,  
garbage containers, cooling towers, etc.  
• not exposed to prevailing winds, whenever  
reasonably possible.  
The outside perimeter of the weatherhood must be  
caulked to prevent leakage into the building.  
The design and size of the weatherhoods or louvers  
chosen by the installer must allow for adequate free  
area. Water and snow penetration of the system is min-  
imized when the airflow does not exceed 750 FPM  
(3.81m/s) free area velocity.  
The Ductwork System  
A well designed ducting system will allow the HRV to  
operate at its maximum efficiency. Avoid the use of  
undersized ducting and sharp radius bends and tees  
which can significantly increase the system pressure  
drop and reduce the air flows.  
Ducting from the Weatherhoods  
NOTE: Fully insulated ducting with an integral vapour  
barrier must be used on all runs passing  
through unheated areas in order to avoid  
condensation problems and energy losses  
from the air streams.  
Galvanized sheet metal ducting with sufficient cross  
section with an integral single piece vapour barrier  
should be used to connect the HRV to the weather-  
hoods. All ducting must meet ULC Class 1 Fire Rating.  
* Consult local Codes  
A minimum R value of insulation should be equal to 4  
(RSI 0.75), or as stated in local codes.  
To minimize pressure drop and noise, galvanized metal  
ducts sized for 1200 fpm (6.09 m/s). (maximum  
velocity) are recommended. Keep ducting as short as  
possible and use a minimum of elbows and tees.  
Connecting sections and shorter runs may be flexible  
ducting one size larger than the metal duct. Use  
flexible duct connectors at the HRV to avoid noise  
transmission.  
A good bead of high quality caulking (preferably  
acoustical sealant) and taping with a high quality alu-  
minum foil tape is recommended to seal the duct to  
both the HRV and the weatherhood.  
Warmside Ducting - General  
Ducting from the HRV to different areas within the  
building should be galvanized metal whenever  
possible.  
All duct joints must be secured with screws, rivets or  
duct sealant and sealed with aluminum duct tape to  
prevent leakage.  
To minimize airflow losses in the ductwork system, all  
ducts should be as short as possible and with as few  
bends or elbows as possible. 45˚ elbows are preferred  
to 90˚ elbows, whenever possible. Use Y tees instead  
of 90˚ tees whenever possible.  
Outside Weatherhoods  
The 2500EFD is shipped with 2 weatherhoods inside  
the cabinet which attach to the outer ends of the cabi-  
net using bolts provided. The 2500IFD requires hoods  
to be built elsewhere and provided by the contractor.  
All duct joints must be fastened securely and wrapped  
with a quality duct tape to prevent leakage. We recom-  
mend aluminum foil tape.  
The 2500EFD has built-in screens to prevent foreign  
objects from entering into the ductwork through the out-  
side hoods.  
12  
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Stale Air Return System  
Fresh Air Supply System  
The stale air return system is used to draw air from the  
points in the building where the worst air quality prob-  
lems occur. Balancing dampers and/or adjustable  
grilles are recommended on all return air lines which  
are used during installation to help balance the "draw"  
from different areas of the building. Note that the  
installation schematics show balancing dampers  
and/or adjustable grilles on all return air lines coming  
back to the unit.  
The fresh air supply ductwork from the HRV may be  
directly connected to the return air duct of the forced  
air system. When directly connected it is recommend-  
ed that the air handler blower be in constant operation  
to move the fresh air about the building (see  
Installation Warning under "The Integrated HVAC  
System" on page 16). Also, it is advisable to include  
a short length of fabric flex duct or other non-metallic  
connector in this hard ducted line in order to keep the  
HRV acoustically isolated and separately grounded  
(electrically) from the air handler. This will avoid a  
possible shock hazard to service people if a short to  
ground develops in one of the devices. It may be nec-  
essary to install a separate fresh air supply ductwork  
system if the heating is other than forced air.  
Alternately, the stale air may be drawn directly from the  
return air duct. When this system is used the air han-  
dler's blower will need to operate constantly when ven-  
tilation is required. The exhaust takeoff connection  
must be at least a meter from a directly connected  
HRV supply duct if both are connected to the same  
duct run.  
When installing an HRV, the designer and installer  
should be aware of local codes that may require  
smoke detectors and/or firestats in the HVAC or HRV  
ductwork. Because an HRV is designed to bring fresh  
air into the building, structures may require a supply  
voltage interrupt when smoke or flame sensors are  
triggered or central fire alarm system is activated.  
NOTE: See the INSTALLATION WARNING under  
"The Integrated HVAC System" on page 16  
A damper located just prior to the HRV is required to  
balance the stale air exhausted with the fresh air  
supply entering the building.  
Return air suction points should be located at the  
opposite side of the room to the fresh air inlet. The  
inlets may be located in the ceiling or high on the walls  
and fitted with inlet grilles.  
Supply air grilles may be ceiling or high wall mounted.  
Avoid locating incoming fresh air grilles that could  
cause a direct draft on the occupants as the incoming  
air may be below room temperature. A reheat duct  
heater can be installed to improve occupant comfort.  
Information on electric or hydronic heaters is available  
through Nutech.  
Many commercial activities produce air contaminants  
in the form of dusts, fumes, mists, vapours and gases.  
Contaminants should be controlled at the source so  
that they are not dispersed through the building nor  
allowed to increase to toxic concentration levels. The  
heat recovery ventilator allows for economical opera-  
tion of the HVAC system while effectively removing  
contaminants from the space. In designing the exhaust  
portion of the system the exhaust grilles are placed so  
as to remove the contaminants while not allowing them  
to enter the breathing zone of the occupants.  
The use of balancing dampers or adjustable grilles as  
supply air diffusers and air exhaust grilles are recom-  
mended. TECHGRILLES™ are round, efficient,  
sound absorbing devices available in 4", 5", 6" and 8"  
(100, 125, 150 and 200mm).  
For contaminants that are lighter than air, grilles  
should be located high on the wall. If contaminants are  
heavier than air, a lower placement of the grilles will be  
required. Information on a contaminants specific  
gravity and toxicity should be available from the  
chemical data sheets.  
AIR FLOW  
SUPPLY  
AIR FLOW  
TECHGRILLE  
(optional)  
EXHAUST  
schematic  
13  
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PITOT TUBE AIR FLOW BALANCING - “Commercial”  
It is necessary to have balanced air flows in an HRV. The volume of  
air brought in from the outside must equal the volume of air exhausted by  
the unit. If the air flows are not properly balanced, then;  
• The HRV may not operate at its maximum efficiency  
• A negative or positive air pressure may occur in the house  
• The unit may not defrost properly  
typical reading. Repeat this procedure in the other (supply or return)  
duct. Determine which duct has the highest airflow (highest reading on  
the gauge). Then damper that airflow back to match the lower reading  
from the other duct. The flows should now be balanced. Actual airflow  
can be determined from the gauge reading. The value read on the  
gauge is called the velocity pressure. The Pitot tube comes with a  
chart that will give the air flow velocity based on the velocity pressure  
indicated by the gauge. This velocity will be in either feet per minute or  
metres per second. To determine the actual airflow, the velocity is multi-  
plied by the cross sectional area of the duct being measured.  
• Failure to balance HRV properly may void warranty  
Excessive positive pressure may drive moist indoor air into the exter-  
nal walls of the building where it may condense (in cold weather) and  
degrade structural components. May also cause key holes to freeze up.  
This is an example for determining the airflow in a 6" duct.  
The Pitot tube reading was 0.025 inches of water.  
From the chart, this is 640 feet per minute.  
Excessive negative pressure may have several undesirable effects.  
In some geographic locations, soil gases such as methane and radon  
gas may be drawn into the home through basement/ground contact  
areas. Excessive negative pressure may also cause the backdrafting of  
vented combustion equipment.  
The 6" duct has a cross sectional area of  
The airflow is then:  
=
[3.14  
x
(6"÷12)2]÷4  
= 0.2 square feet  
Read the Application Warning on the front of this manual!  
640 ft./min.  
X
0.2 square feet = 128 cfm  
Prior to balancing, ensure that:  
1. All sealing of the ductwork system has been completed.  
2. All of the HRV's components are in place and functioning properly.  
3. Balancing dampers are fully open.  
For your convenience, the cross sectional area of some common  
round duct is listed below:  
4. Unit is on HIGH speed.  
DUCT DIAM. (inches)  
CROSS SECTION AREA (sq. ft.)  
5. Air flows in branch lines to specific areas of the house should be  
adjusted first prior to balancing the unit. A smoke pencil used at the  
grilles is a good indicator of each branch line's relative air flow.  
6. After taking readings of both the stale air to the HRV duct and  
fresh air to the house duct, the duct with the lower CFM ([L/s]  
velocity) reading should be left alone, while the duct with the higher  
reading should be dampered back to match the lower reading.  
7. Return unit to appropriate fan speed for normal operation  
5
6
7
0.14  
0.20  
0.27  
The accuracy of the air flow reading will be affected by how close to  
any elbows or bends the readings are taken. Accuracy can be  
increased by taking an average of multiple readings as outlined in the  
literature supplied with the Pitot tube.  
BALANCING PROCEDURE  
Pitot tube and gauge  
The following is a method of field balancing an HRV using a Pitot tube,  
advantageous in situations when flow stations are not installed in the duct-  
work. Procedure should be performed with the HRV on high speed.  
DUCT  
AIR FLOW  
The first step is to operate all mechanical systems on high speed, which  
have an influence on the ventilation system, i.e. the HRV itself and the  
forced air furnace or air handler if applicable. This will provide the maxi-  
mum pressure that the HRV will need to overcome, and allow for a more  
accurate balance of the unit.  
Pitot Tube Air Flow  
Balancing Kit  
c/w magnehelic gauge,  
Pitot tube, hose and  
carry case.  
Pitot tube  
Magnehelic gauge  
PART NO. 99-167  
Drill a small hole in the duct (about 3/16"), three feet downstream of  
any elbows or bends, and one foot upstream of any elbows or bends.  
These are recommended distances but the actual  
installation may limit the amount of straight duct.  
The Pitot tube should be connected to a magnehelic  
gauge or other manometer capable of reading from 0  
to 0.25 in. (0-62 Pa) of water, preferably to 3 digits of  
resolution. The tube coming out of the top of the pitot  
is connected to the high pressure side of the gauge.  
The tube coming out of the side of the pitot is con-  
nected to the low pressure or reference side of the  
gauge.  
Outdoors  
Note: Duct connections may vary,  
depending on model.  
Insert the Pitot tube into the duct; pointing the tip into  
the airflow.  
Pitot  
tube  
Pitot  
tube  
Magnehelic  
gauge  
Magnehelic  
gauge  
For general balancing it is sufficient to move the pitot  
tube around in the duct and take an average or  
Place pitot tube a minimum of  
18" from blower or elbows  
14  
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The Integrated HVAC System  
Maintenance  
WARNING: The 2500 is a quiet, efficient, low  
pressure system. Special care and attention  
should be given if connecting this unit to any  
other air handler that may draw more air than  
the 2500 is designed to accommodate.  
As with any mechanical system, a dedicated  
maintenance program will prolong the life of the  
equipment, and maintain its optimum performance.  
We recommend at least two (2) full inspections and  
cleanings per year under normal operating  
conditions, and more if circumstances warrant it.  
The HRV has become an integral component of the  
HVAC system. Figure 4 shows an HRV unit provid-  
ing fresh air directly to the return air plenum of a  
Rooftop heat/cool unit.  
Service should include:  
Many buildings have a ceiling return air plenum  
as in Figure 5. Fresh air from the HRV can be intro-  
duced directly into the ceiling space near the air  
handler’s intake.  
• Cleaning of screens protecting outside hoods.  
• Cleaning of core.  
To access core, remove service panels and  
slide core halfway out. Wash core protruding  
from cabinet with water and/or a mild cleaning  
solution. Push core through to the other side of  
the cabinet and repeat procedure to clean the  
other side of the core. In many cases, only a  
vacuuming of the core surface is required.  
In installations where it is satisfactory to provide  
general exhaust from the space, the air to be  
exhausted may be taken directly from the return air  
plenum to the HRV as it is drawn back to the air  
handler. Fresh air supplied by the HRV is then intro-  
duced directly into the return air plenum but at a  
location closer to the air handler. The air handler  
would have a constant running blower to effectively  
distribute the fresh air and remove the stale air.  
Balancing dampers would be located in both the  
HRV supply and exhaust ducts between the return  
air plenum and the HRV.  
• Inspect filters and replace as necessary.  
• Wipe down drain pans and inside of cabinet,  
using a mild disinfectant.  
• Ensure condensate drain has free flow of  
moisture.  
Electrical Connections  
• Inspect blowers and electrical panel.  
• Confirm operation.  
System is 208/230V, 1 phase, 60 Hz. This unit  
meets all local codes and requirements.  
It is STRONGLY recommended that an electrical  
disconnect be installed prior to the HRV, and that it  
is turned off and locked out before servicing the  
unit.  
All electrical connections should be made by a  
qualified electrician.  
Two (2) knock-outs are provided. One is to be used  
for line voltage, and the other one for 24V control  
wires.  
15  
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The Integrated HVAC System  
Check design static pressure  
of air handler to ensure it is  
compatible with HRV  
ROOFTOP  
HEAT/COOL UNIT  
FRESH AIR TO BUILDING  
SUPPLY DUCT  
FRESH AIR  
SUPPLY  
STALE AIR  
EXHAUST  
RETURN  
AIR DUCT  
DAMPERS OR  
ADJUSTABLE GRILLES  
B
A
HRV UNIT  
EXHAUST  
TO HRV  
BALANCING  
DAMPERS  
Figure 4  
ROOFTOP  
HEAT/COOL UNIT  
ROOF DECK  
CEILING RETURN AIR PLENUM  
SUPPLY DUCTWORK  
FRESH AIR  
INTAKE  
HRV UNIT  
STALE AIR  
EXHAUST  
A
B
HRV FRESH  
AIR SUPPLY  
STALE AIR  
EXHAUST DUCT  
BALANCING  
DAMPERS  
Figure 5  
BALANCING DAMPERS  
A - Fresh Air Supply  
B - Stale Air Exhaust  
16  
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2500 WIRING DIAGRAM  
BROWN  
BROWN  
BROWN  
CAP  
CAP  
BROWN  
SUPPLY  
MOTOR  
EXHAUST  
MOTOR  
SUPPLY  
EXHAUST  
C2  
C4  
C1  
C3  
LOW  
LOW  
HIGH  
HIGH  
R1  
R2  
R3  
R4  
NO  
NO  
NO  
NC  
NC  
NC  
NO  
NC  
TIMER  
COM  
COM  
COM  
COM  
SNAP  
DISK  
T6  
T5  
T4  
T3  
T2  
24V  
F1  
240V  
ON/OFF  
HIGH/LOW  
COMMON  
ON/OFF  
HIGH/LOW  
COMMON  
F2  
MAX  
F3  
MAX  
15A  
15A  
XFRM1  
L1 L2  
240 VAC  
15 AMPS  
T1  
5 AMP  
24 VAC  
24 VAC  
TI-109  
07/97  
17  
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2500 LADDER DIAGRAM  
240 Volt  
L1  
L2  
15A  
15A  
C1-1  
C1-2  
C2-2  
C3-2  
C4-2  
1
2
3
4
5
SM  
SM  
EM  
Blk  
Yel  
High  
Com  
C2-1  
C3-1  
C4-1  
Red  
Low  
Yel  
Com  
Blk  
High  
Yel  
Com  
EM  
Red  
Low  
Yel  
Com  
XFMRI  
L1  
5A  
L2  
6
7
24v  
ON/OFF  
R2  
HIGH/LOW  
SNAP DISK  
R3  
8
9
TM1  
TM1-1  
10  
11  
12  
13  
R1  
R4  
R2-1  
R1-1 R3-1  
R4-1 R3-1  
R3-1  
C1  
C2  
C3  
C4  
14  
15  
EM Exhaust Motor  
SM Supply Motor  
R3-1  
18  
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COMMERCIAL LIFEBREATH®  
HEAT RECOVERY VENTILATORS  
• Two Year Limited Warranty • 15 Year Core Warranty  
NUTECH BRANDS INC.® (NUTECH) warrants to the purchaser of the Commercial  
LIFEBREATH® model and accessories referred to below, to be free from manufacturing defects.  
This Warranty is personal to NUTECH® and is in effect from the date of the original pur-  
chase for a period of two years, save and except that a 15 YEAR WARRANTY is given to the  
LIFEBREATH® core should it develop a condensation leak or become perforated due to corrosion  
caused by normal use.  
Damage resulting from all other causes, including but not limited to: lighting, hurricane,  
tornado, earthquake or any other acts of God; improper installation, modification, alteration or misuse  
of the LIFEBREATH® or its operation in a manner contrary to the instructions accompanying the unit  
at the time of sale; accidental or intentional damage, neglect, improper care, or other failure by the  
owner to provide reasonable and necessary maintenance of the product; any attempt at repair by an  
unauthorized service representative or not in accordance with this warranty; or any other causes  
beyond the control of NUTECH®, are excluded from this warranty.  
If you feel that the LIFEBREATH® you purchased is not free from manufacturing defects,  
please contact NUTECH BRANDS INC.®, 511 McCormick Blvd., London, Ontario N5W 4C8, 519-  
457-1904 or fax 519-457-1676 to find the name of your nearest dealer in order to repair the product.  
The labour required to install any replacement part(s) shall be dealt with at the option of the cus-  
tomer in either of the following ways:  
(a) the customer may supply labour at their own expense: or  
(b) if the product was purchased from a dealer, then the dealer  
will supply labour at cost to the customer.  
NUTECH® reserves the right to replace the entire unit or to refund the original purchase  
price in lieu of repair.  
NUTECH® MAKES NO EXPRESS WARRANTIES, EXCEPT FOR THOSE THAT ARE SET FORTH  
HEREIN AND SHALL NOT BE LIABLE FOR ANY INCIDENTAL, SPECIAL OR CONSEQUENTIAL  
DAMAGES WITH RESPECT TO LIFEBREATH® COVERED BY THIS WARRANTY. NUTECH’S  
COMPLETE LIABILITY AND THE OWNER’S EXCLUSIVE REMEDY BEING LIMITED TO REPAIR  
OR REPLACEMENT ON THE TERMS STATED HEREIN. ANY IMPLIED WARRANTIES,  
INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTY OF MERCHANTABILITY AND  
OF FITNESS FOR ANY PARTICULAR PURPOSE, ARE EXPRESSLY EXCLUDED.  
NO PERSON IS AUTHORIZED TO CHANGE THE WARRANTY IN ANY WAY OR GRANT ANY  
OTHER WARRANTY UNLESS SUCH CHANGES ARE MADE IN WRITING AND SIGNED BY AN  
OFFICER OF NUTECH®.  
MODEL NO.:_____________________________________________________________________  
UNIT SERIAL NO.:________________________________________________________________  
INSTALLED BY:__________________________________________________________________  
DATE: __________________________________________________________________________  
TI-38  
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