Lifebreath 1000rhcac User Manual

OPERATION AND  
INSTALLATION MANUAL  
NOTE: ALTHOUGH SOME MODELS  
For Models:  
DIFFER IN OPERATION, THE BASIC  
STEPS ARE SIMILAR.  
700DDPOOL  
CAUTION  
1200DDPOOL  
1000RHC  
1000RHCAC  
Before installation, careful consideration must be  
given to how the 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/Energy Recovery Ventilator  
(HRV), by using the balancing procedure in  
this manual.  
It is always important to assess how the operation  
of any HRV may interact with vented combustion  
equipment (ie. Gas Furnaces, Oil Furnaces, Wood  
Stoves, etc.).  
NEVER install an HRV 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-81C  
1203  
Model 700DD POOL  
SPECIFICATIONS  
PERFORMANCE  
AIRFLOWS (Each Air Stream)  
CORES  
Modular (2 section) patented aluminum heat recovery cores arranged  
for efficient cross-flow ventilation.Meets the flame spread and smoke  
developed classifications of the National Building Code and NFPA 90A  
(1993 Edition)  
423 (900)  
378 (800)  
329 (700)  
282 (600)  
235 (500)  
190 (400)  
143 (300)  
94 (200)  
5.5 HIGH  
MOTORS  
HIGH SPEED  
5.0 MED  
Two PSC, 3 speed single shafted, 120 VAC, 2.75 Amps each (5.5 total on  
high speed). HP - 1/10, 1625 RPM. Watts - total on high speed - 648.  
MED SPEED  
4.7 LOW  
LOW SPEED  
FILTERS  
Washable air filters in exhaust and supply air streams.  
BLOWERS  
42 (100)  
Centrifugal type rated at 700 cfm (329 L/s) free air delivery. Each air  
stream has one single shafted motor driving a centrifugal blower.  
25 (.1) 50 (.2) 75 (.3) 100 (.4) 125 (.5) 150 (.6) 175 (.7)  
EXTERNAL STATIC PRESSURE IN PASCALS (IN. W.C.)  
CONNECTION DUCT SIZES  
Five - 14" x 8" H (356 mm x 200 mm H).  
TEMPERATURE EFFECTIVENESS  
MOUNTING  
Unit to be set on support brackets hung by threaded rod type  
apparatus. (brackets and rod not provided.)  
70%  
60%  
50%  
CASE  
20 gauge prepainted galvanized steel (G60) for superior corrosion  
resistance. Insulated with foil faced insulation duct liner where required to  
prevent exterior condensation. Drain connections; two - 1/2" (12 mm)  
O.D.  
CONTROLS  
NOTE: Exhaust Relative Humidity (RH) at 40%  
Illuminated power switch, 3 speed blower control, low voltage (24 VAC)  
terminals for connection of remote dehumidistat (supplied) and defrost  
light indicating automatic operation.  
190  
329  
143  
(300)  
235  
282  
(400)  
(700)  
(500)  
(600)  
AIRFLOW IN L/s (CFM)  
DEFROST  
Supply bypass routes indoor air to defrost core.  
WEIGHT 142 lbs. (64.4 kg) SHIPPING WEIGHT 167 lbs. (75.8 kg)  
DIMENSIONS 700DDPOOL mm (inches)  
SUPPLY AIR  
FROM OUTSIDE  
MOUNTING POINTS  
CONTROLS  
EXHAUST AIR  
TO OUTSIDE  
POOL AND  
DEFROST  
AIR  
356 mm  
(14")  
356 mm  
(14")  
165 mm  
(6 1/2")  
165 mm  
(6 1/2")  
NOTE:  
Service clearance  
is 760 mm (30 in.)  
from front  
625 mm  
(24 5/8 ")  
210 mm  
(8 1/4")  
159 mm  
(6 1/4")  
access doors  
200 mm  
(8")  
200 mm  
(8")  
SUPPLY AIR  
TO BUILDING  
EXHAUST AIR  
FROM POOL  
730 mm  
(28 3/4")  
730 mm  
(28 3/4")  
DRAIN CONNECTION  
753 mm (29 5/8")  
FRONT VIEW  
All units conform to CSA and UL standards.  
DISCHARGE SIDE  
INLET SIDE  
WARRANTY  
All units carry a 15 year warranty on the heat recovery cores  
and a 2 year replacement parts warranty.  
DATE: ____________________________________________PROJECT: _______________________________________  
MECHANICAL CONTRACTOR: _________________________________________________________________________  
TI-104  
1203  
3
Model 1200DD POOL  
SPECIFICATIONS  
CORES  
PERFORMANCE  
Modular (3 section) patented aluminum heat recovery cores arranged  
for efficient cross-flow ventilation. Meets the flame spread and smoke  
developed classifications of the National Building Code and NFPA 90A  
(1993 Edition).  
AIRFLOWS (Each Air Stream)  
613 (1300)  
566 (1200)  
518 (1100)  
472 (1000)  
423 (900)  
378 (800)  
329 (700)  
282 (600)  
235 (500)  
8.1 HIGH  
MOTORS  
7.8 MED  
Two PSC, 3 speed double shafted, 120 VAC, 4 Amps each (8.1 total  
on high speed). HP - 1/4, 1625 RPM. Watts - total on high speed -  
972.  
HIGH SPEED  
7.1 LOW  
MED SPEED  
FILTERS  
Washable air filters in exhaust and supply air streams.  
LOW SPEED  
BLOWERS  
Centrifugal type rated at 1200 cfm (566 L/s) free air delivery. Each air  
stream has one double shafted motor driving a centrifugal blower.  
25 (.1) 50 (.2) 75 (.3) 100 (.4) 125 (.5) 150 (.6) 175 (.7)  
EXTERNAL STATIC PRESSURE IN PASCALS (in. W.C.)  
CONNECTION DUCT SIZES  
Five - 20" x 8" H (508 mm x 200 mm H).  
TEMPERATURE EFFECTIVENESS  
MOUNTING  
Unit to be set on support brackets hung by threaded rod type  
apparatus. (brackets and rods not provided).  
70%  
60%  
50%  
CASE  
20 gauge prepainted galvanized steel (G60) for superior corrosion  
resistance. Insulated with foil faced insulation duct liner where required  
to prevent exterior condensation. Drain connections; two - 1/2" (12  
mm) O.D.  
CONTROLS  
NOTE: Exhaust Relative Humidity (RH) at 40%  
Illuminated power switch, 3 speed blower control, low voltage (24 VAC)  
terminals for connection of remote dehumidistat (supplied) and defrost  
light indicating automatic operation.  
235  
282  
329  
378  
423  
472  
518  
566  
(500)  
(600)  
(700)  
(800)  
(900)  
(1000)  
(1100)  
(1200)  
DEFROST CONTROLS  
AIRFLOW IN L/s (CFM)  
Supply bypass damper routes indoor air to defrost core.  
WEIGHT 191 lbs. (87 kg) SHIPPING WEIGHT 215 lbs. (98 kg)  
DIMENSIONS 1200DDPOOL mm (inches)  
SUPPLY AIR  
FROM OUTSIDE  
MOUNTING POINTS  
EXHAUST AIR  
TO OUTSIDE  
CONTROLS  
POOL AND  
DEFROST AIR  
508 mm  
(20")  
508 mm  
(20")  
263 mm  
(10 3/8")  
263 mm  
(10 3/8")  
NOTE:  
Service clearance  
is 760 mm (30 in.)  
from front  
625 mm  
(24 5/8 ")  
172 mm  
(6 3/4")  
159 mm  
(5 7/8")  
access doors  
200 mm  
(8")  
200 mm  
(8")  
EXHAUST AIR  
FROM POOL  
1055 mm  
(41 1/2")  
1055 mm  
(41 1/2")  
DRAIN CONNECTION  
759 mm (29 7/8")  
SUPPLY AIR  
TO BUILDING  
FRONT VIEW  
DISCHARGE SIDE  
INLET SIDE  
All units conform to CSA and UL standards.  
WARRANTY  
Units carry a 15 year warranty on the heat recovery cores  
and a 2 year replacement parts warranty.  
DATE: ___________________________________________PROJECT: _________________________________________  
MECHANICAL CONTRACTOR: _________________________________________________________________________  
TI -121  
1203  
4
Model 1000RHC and  
Model 1000RHCAC  
SPECIFICATIONS  
CORES  
PERFORMANCE  
Modular (3 section) patented aluminum heat recovery cores arranged for  
high efficiency cross-flow ventilation. Meets the flame spread and smoke  
developed classifications of the National Building Code and NFPA 90A (1993  
Edition).  
AIRFLOWS (Each Air Stream)  
613 (1300)  
566 (1200)  
518 (1100)  
472 (1000)  
423 (900)  
378 (800)  
329 (700)  
282 (600)  
235 (500)  
8.1 HIGH  
MOTORS  
Two PSC, 3 speed double shafted, 120 VAC, 3.95 Amps each (7.9 total on  
high speed). HP - 1/4, 1625 RPM. Watts - total on high speed - 848.  
7.8 MED  
HIGH SPEED  
FILTERS Washable air filters in exhaust and supply air streams.  
7.1 LOW  
BLOWERS  
Each air stream has one double shafted motor driving 2 centrifugal blowers.  
HYDRONIC REHEAT COIL  
Standard built-in coil in both 1000RHC and 1000RHCAC. Rated 35,000 BTU  
@ 140°F, 3 US gal./min. Design temperature drop is 20°F, fluid pressure drop  
is 1.3 feet WG at rated flow, 3/4" fittings.  
25 (.1) 50 (.2) 75 (.3) 100 (.4) 125 (.5) 150 (.6) 175 (.7) 200 (.8)  
EXTERNAL STATIC PRESSURE IN PASCALS (in. W.C.)  
CONNECTION DUCT SIZES Five - 20" X 8" H (508 mm x 200 mm H).  
TEMPERATURE EFFECTIVENESS  
DIRECT EXPANSION (DX) EVAPORATOR COIL (model 1000RHCAC  
only) Factory installed 1.5 ton DX coil, 0.875" OD suction side, 0.625" OD  
liquid side, built-in orifice.  
MOUNTING  
70%  
60%  
50%  
Two brackets under cabinet, connect to threaded rod type supports  
(not included).  
CASE  
20 gauge prepainted galvanized steel (G60) for superior corrosion resistance.  
Insulated with foil faced insulation where required to prevent exterior conden-  
sation. Drain connections; two - 1/2" (12 mm) O.D.  
CONTROLS  
NOTE: Exhaust Relative Humidity (RH) at 40%  
Illuminated power switch, 3 speed blower control, low voltage (24 VAC) termi-  
nals to connect remote controls (not included), defrost light indicating  
defrost/recirculation mode.  
235  
282  
329  
378  
423  
472  
518  
566  
(500)  
(600)  
(700)  
(800)  
(900)  
(1000)  
(1100)  
(1200)  
AIRFLOW IN L/s (CFM)  
DEFROST CONTROLS  
Supply bypass damper routes indoor air to defrost core.  
Performance data includes both reheat and DX coil installed.  
Note there is little change in air flow with the DX coil removed.  
WEIGHT 255 lbs.(116 Kg)  
SHIPPING WEIGHT 280 lbs.(127 Kg)  
mm (inches)  
DIMENSIONS 1000RHC/RHCAC  
SUPPLY AIR  
FROM OUTSIDE  
DEFROST &  
RECIRCULATION  
AIR  
EXHAUST AIR  
TO OUTSIDE  
CONTROLS  
263 mm  
508 mm  
(20 ")  
508 mm  
(20")  
(
10 3/8 ")  
NOTE:  
Service clearance  
is 760 mm (30 in.)  
149 mm  
625 mm  
(24 5/8")  
(
5 7/8 ")  
263 mm  
(10 3/8 ")  
508 mm  
(20 ")  
200 mm  
(8")  
EXHAUST AIR  
FROM BUILDING  
1088 mm  
(46 3/4")  
1055 mm  
(41 1/2")  
DRAIN CONNECTION  
COIL FITTINGS  
SUPPLY AIR  
TO BUILDING  
DISCHARGE SIDE  
INLET SIDE  
FRONT VIEW  
99-101 Sixty Minute Remote Timer  
WARRANTY  
Units carry a 15 year warranty on the heat recovery cores and  
a 2 year replacement parts warranty.  
99-130 Remote Wall Mount Dehumidistat Control  
24VAC only  
All units conform to CSA and UL standards.  
NOTE: Hydronic reheat coil is designed to temper the ventilation air (after heat recovery) back to room temperature, and is not  
intended for use as a primary heating source for the space.  
Additional controls MUST be added to pump system (not included / not available from Nutech) feeding the coil to ensure  
continuous water flow through it, and prevent freezing of the coil.  
DX coil is designed to reduce humidity brought in from outside during ventilation. Coil MUST be connected to an outdoor  
condensing unit (not included) by certified trades person. Not intended as a primary air conditioning system for the space.  
DATE:_____________________________________________PROJECT: ________________________________________  
MECHANICAL CONTRACTOR: __________________________________________________________________________  
TI-115  
5
1203  
Sizing your Pool Heat Recovery Ventilator  
Determining ventilation requirements for  
Indoor Pool enclosures  
Moisture removal capabilities  
In addition to the amount of air being exchanged,  
moisture removal depends largely on the moisture  
content of both the inside and outside air. The  
trends below outline these principles.  
There are two primary reasons to ventilate an indoor  
pool enclosure. One is to provide effective and  
efficient control of harmful humidity levels. The other  
reason is to control the Indoor Air Quality (IAQ) in  
the pool room enclosure. When an HRV system is  
adequately sized to control humidity,  
the IAQ will automatically be controlled for most  
situations. Therefore this HRV sizing guide will focus  
on the amount of moisture introduced into  
the air from the pool and the moisture removing  
capabilities of an HRV at various flow rates.  
The higher the indoor relative humidity, the  
larger the moisture removing capabilities.  
The higher the indoor temperature, the larger  
the moisture removing capabilities  
The lower the outdoor temperature, the  
larger the moisture removing capabilities.  
Detailed Calculation of Total  
Ventilation Requirements  
The amount of moisture evaporated  
from a pool is effected by:  
The following charts and equations can be used  
to accurately size the HRV for a indoor pool  
application. At this time some decisions should be  
made with regards to:  
1. Surface area of the pool  
2. The water temperature  
3. Indoor air temperature  
4. Indoor relative humidity (R.H.)  
5. The amount of activity in the pool room  
Pool water temperature  
Indoor air temperature  
Relative humidity  
These short rules will help in understanding  
how these factors will effect moisture  
generation  
It should be noted that the construction and quality of  
materials used in the construction of the pool room will  
influence the size of HRV required. High quality  
windows such as triple glazed, argon filled will allow a  
higher indoor humidity level before condensation will  
occur. A pool room built with loose construction  
techniques will have a higher natural ventilation rate  
than that of a room built to higher standards. It is  
recommended for all applications it is assumed there is  
no natural ventilation.  
1. Larger areas of water will evaporate greater  
amounts of water.  
(By using a pool cover the surface area of the  
pool will be reduced and will substantially reduce  
water evaporation.)  
2. Higher water temperatures will increase water  
evaporation.  
The first table contains the evaporation rate of  
water based on the water temperature, room  
temperature, and room relative humidity.  
3. Lower indoor air temperatures will increase water  
evaporation.  
4. Lower indoor relative humidity will increase water  
evaporation.  
The second table contains the flowrate factor  
based on the indoor temperature, outdoor  
temperature, and room relative humidity.  
5. Activities in the pool will increase the water  
surface area, therefore water evaporation will  
increase.  
The total ventilation rate per square foot of water  
surface area is the result of these calculations. The  
total ventilation rate is this product multiplied by the  
water surface area.  
6
Calculation  
Note:  
As a general rule, if the water temperature is maintained at 80˚F and the pool room air  
temperature is maintained at 82˚F, use a factor of 1 cfm/sq ft of pool surface or .5 cfm/sq ft of room  
area (whichever is greater) to determine amount of ventilation required.  
Example:  
Pool surface area  
16’ x 32’ (512 sq ft)  
83 ˚F  
*Indoor design air temperature  
Pool water temperature  
Relative Humidity  
81 ˚F  
50 %  
15 ˚F  
*Outdoor design air temperature  
* Always use design temperatures for indoor and outdoor air temperatures. Outdoor design temperatures  
are published by organizations such as ASHRAE. Do not us day to day temperatures for this calculation.  
1. From Table 1, select the appropriate evaporation rate based on the room air temperature,  
water temperature, and relative humidity.  
Evaporation Rate = 0.052  
2. From Table 2, select the corresponding flowrate factor depending on the indoor air temperature,  
outdoor temperature, and room relative humidity.  
Flowrate Factor = 21.70  
3. Multiply the values obtained from step 1 and step 2 to obtain the minimum CFM  
required per square foot of pool surface area.  
Evaporation rate  
0.052  
X
X
Flowrate  
21.70  
= CFM / square foot of water surface area  
= 1.12  
4. Multiply the value in step 3 by the area of the pool  
Area of pool  
512  
X
X
Value for step 3  
1.12  
= CFM  
573  
=
System Installation  
It is necessary to design and size the duct distribution system for both the supply and the exhaust  
air streams.  
Proper duct design will  
Minimize air flow requirements  
Ensure a comfortable environment by using reheat if required  
Optimize humidity control, including eliminating condensation on windows by  
blanketing the windows with airflow  
Please refer to sketch 1 and 2 for typical duct layouts.  
7
Evaporation Rate  
Indoor Relative Humidity  
TABLE 1  
40%ꢀ 50%ꢀ 60% 40%ꢀ 50%ꢀ 60% 40%ꢀ 50%ꢀ 60% 40%ꢀ 50%ꢀ 60% 40%ꢀ 50%ꢀ 60% 40%ꢀ 50%ꢀ 60%  
Evaporation Rate lb/(sq. ft-hr.)  
68ꢀ 0.069ꢀ 0.063ꢀ 0.056ꢀ 0.079ꢀ 0.073ꢀ 0.066ꢀ 0.090ꢀ 0.084ꢀ 0.077ꢀ 0.102ꢀ 0.095ꢀ 0.089ꢀ 0.115ꢀ 0.108 0.102 0.129 0.122 0.116  
70ꢀ 0.068ꢀ 0.060ꢀ 0.053ꢀ 0.078ꢀ 0.070ꢀ 0.063ꢀ 0.088ꢀ 0.081ꢀ 0.074ꢀ 0.100ꢀ 0.093ꢀ 0.086ꢀ 0.113ꢀ 0.106ꢀ 0.099 0.127 0.120 0.113  
72ꢀ 0.065ꢀ 0.058ꢀ 0.050ꢀ 0.075ꢀ 0.068ꢀ 0.060ꢀ 0.086ꢀ 0.079ꢀ 0.071ꢀ 0.098ꢀ 0.090ꢀ 0.083ꢀ 0.111ꢀ 0.103ꢀ 0.096 0.125 0.117 0.110  
74ꢀ 0.063ꢀ 0.055ꢀ 0.047ꢀ 0.073ꢀ 0.065ꢀ 0.057ꢀ 0.084ꢀ 0.076ꢀ 0.068ꢀ 0.096ꢀ 0.088ꢀ 0.079ꢀ 0.109ꢀ 0.101ꢀ 0.092 0.123 0.115 0.106  
76ꢀ 0.061ꢀ 0.052ꢀ 0.043ꢀ 0.071ꢀ 0.062ꢀ 0.053ꢀ 0.082ꢀ 0.073ꢀ 0.064ꢀ 0.094ꢀ 0.085ꢀ 0.076ꢀ 0.107ꢀ 0.098ꢀ 0.089 0.121 0.112 0.103  
78ꢀ 0.059ꢀ 0.049ꢀ 0.039ꢀ 0.069ꢀ 0.059ꢀ 0.049ꢀ 0.080ꢀ 0.070ꢀ 0.060ꢀ 0.091ꢀ 0.082ꢀ 0.072ꢀ 0.104ꢀ 0.095ꢀ 0.085 0.118 0.109 0.099  
80ꢀ 0.056ꢀ 0.046ꢀ 0.035ꢀ 0.066ꢀ 0.056ꢀ 0.045ꢀ 0.077ꢀ 0.067ꢀ 0.056ꢀ 0.089ꢀ 0.079ꢀ 0.068ꢀ 0.102ꢀ 0.091ꢀ 0.081 0.116 0.105 0.095  
82ꢀ 0.053ꢀ 0.042ꢀ 0.031ꢀ 0.063ꢀ 0.052ꢀ 0.041ꢀ 0.074ꢀ 0.063ꢀ 0.052ꢀ 0.086ꢀ 0.075ꢀ 0.064ꢀ 0.099ꢀ 0.088ꢀ 0.077 0.113 0.102 0.091  
84ꢀ 0.050ꢀ 0.039ꢀ 0.027ꢀ 0.060ꢀ 0.049ꢀ 0.037ꢀ 0.071ꢀ 0.060ꢀ 0.048ꢀ 0.083ꢀ 0.071ꢀ 0.060ꢀ 0.096ꢀ 0.084ꢀ 0.073 0.110 0.098 0.087  
86ꢀ 0.047ꢀ 0.035ꢀ 0.022ꢀ 0.057ꢀ 0.045ꢀ 0.032ꢀ 0.068ꢀ 0.056ꢀ 0.043ꢀ 0.080ꢀ 0.068ꢀ 0.055ꢀ 0.093ꢀ 0.080ꢀ 0.068 0.107 0.094 0.082  
88ꢀ 0.044ꢀ 0.031ꢀ 0.017ꢀ 0.054ꢀ 0.041ꢀ 0.027ꢀ 0.065ꢀ 0.052ꢀ 0.038ꢀ 0.077ꢀ 0.063ꢀ 0.050ꢀ 0.090ꢀ 0.076ꢀ 0.063 0.104 0.090 0.077  
ꢀꢀꢀ  
78ꢀꢀꢀ  
81ꢀꢀꢀ  
84ꢀꢀꢀ  
87ꢀꢀꢀ  
90ꢀ ꢀ  
93  
8
TABLE 2  
Flowrate Factor  
Indoor Relative Humidity  
40%ꢀ 50%ꢀ 60% 40%ꢀ 50%ꢀ 60% 40%ꢀ 50%ꢀ 60% 40%ꢀ 50%ꢀ 60% 40%ꢀ 50%ꢀ 60% 40%ꢀ 50%ꢀ 60%  
Flowrate Factor (cfa-hr./lb.)  
-30ꢀ 39.70ꢀ 31.50ꢀ 26.10ꢀ 35.70ꢀ 28.30ꢀ 23.40ꢀ 32.10ꢀ 25.50ꢀ 21.10ꢀ 29.00ꢀ 23.00ꢀ 19.00ꢀ 26.10ꢀ 20.70 17.20 23.60 18.70 15.50  
-25ꢀ 40.20ꢀ 31.80ꢀ 26.20ꢀ 36.10ꢀ 28.50ꢀ 23.60ꢀ 32.40ꢀ 25.70ꢀ 21.20ꢀ 29.20ꢀ 23.10ꢀ 19.10ꢀ 26.30ꢀ 20.90ꢀ 17.20 23.80 18.80 15.60  
-20ꢀ 40.80ꢀ 32.10ꢀ 26.50ꢀ 36.50ꢀ 28.80ꢀ 23.80ꢀ 32.80ꢀ 25.90ꢀ 21.40ꢀ 29.50ꢀ 23.30ꢀ 19.20ꢀ 26.60ꢀ 21.00ꢀ 17.40 24.00 19.00 15.70  
-15ꢀ 41.60ꢀ 32.60ꢀ 26.80ꢀ 37.20ꢀ 29.20ꢀ 24.00ꢀ 33.30ꢀ 26.20ꢀ 21.60ꢀ 29.90ꢀ 23.60ꢀ 19.40ꢀ 26.90ꢀ 21.20ꢀ 17.50 24.20 19.10 15.80ꢀ  
ꢀ -10ꢀ 42.60ꢀ 33.20ꢀ 27.20ꢀ 38.00ꢀ 29.70ꢀ 24.40ꢀ 34.00ꢀ 26.60ꢀ 21.90ꢀ 30.40ꢀ 23.90ꢀ 19.60ꢀ 27.30ꢀ 21.50ꢀ 17.70 24.60 19.30 15.90  
-5ꢀ  
43.90ꢀ 34.10ꢀ 27.80ꢀ 39.00ꢀ 30.40ꢀ 24.80ꢀ 34.80ꢀ 27.10ꢀ 22.20ꢀ 31.10ꢀ 24.30ꢀ 19.90ꢀ 27.90ꢀ 21.80ꢀ 17.90 25.00 19.60 16.10ꢀ  
45.70ꢀ 35.10ꢀ 28.50ꢀ 40.40ꢀ 31.20ꢀ 25.40ꢀ 35.90ꢀ 27.80ꢀ 22.70ꢀ 32.00ꢀ 24.80ꢀ 20.30ꢀ 28.60ꢀ 22.20ꢀ 18.20 25.60 20.00 16.30  
48.10ꢀ 36.50ꢀ 29.40ꢀ 42.30ꢀ 32.30ꢀ 26.10ꢀ 37.40ꢀ 28.70ꢀ 23.20ꢀ 33.20ꢀ 25.50ꢀ 20.70ꢀ 29.50ꢀ 22.80ꢀ 18.60 26.30 20.40 16.60  
51.50ꢀ 38.40ꢀ 30.60ꢀ 44.90ꢀ 33.80ꢀ 27.00ꢀ 39.40ꢀ 29.80ꢀ 24.00ꢀ 34.70ꢀ 26.40ꢀ 21.30ꢀ 30.70ꢀ 23.50ꢀ 19.00 27.30 21.00 17.00  
56.20ꢀ 41.00ꢀ 32.20ꢀ 48.50ꢀ 35.80ꢀ 28.30ꢀ 42.10ꢀ 31.40ꢀ 25.00ꢀ 36.80ꢀ 27.60ꢀ 22.10ꢀ 32.40ꢀ 24.50ꢀ 19.60 28.60 21.70 17.50  
63.40ꢀ 44.70ꢀ 34.50ꢀ 53.70ꢀ 38.50ꢀ 30.00ꢀ 46.00ꢀ 33.50ꢀ 26.30ꢀ 39.70ꢀ 29.30ꢀ 23.10ꢀ 34.60ꢀ 25.70ꢀ 20.40 30.30 22.70 19.10  
74.90ꢀ 50.10ꢀ 37.60ꢀ 61.70ꢀ 42.50ꢀ 32.40ꢀ 51.80ꢀ 36.40ꢀ 28.10ꢀ 44.00ꢀ 31.50ꢀ 24.50ꢀ 37.80ꢀ 27.40ꢀ 21.50 32.70 24.10 19.00  
95.90ꢀ 58.70ꢀ 42.30ꢀ 75.30ꢀ 48.50ꢀ 35.80ꢀ 61.00ꢀ 40.80ꢀ 30.60ꢀ 50.50ꢀ 34.70ꢀ 26.40ꢀ 42.50ꢀ 29.80ꢀ 23.00 36.20 25.90 20.10  
112.78ꢀ 69.62ꢀ 46.60ꢀ 84.08ꢀ 54.75ꢀ 38.60ꢀ 66.18ꢀ 44.71ꢀ 32.53ꢀ 57.46ꢀ 37.32ꢀ 27.77ꢀ 46.85ꢀ 31.63ꢀ 23.99 39.10 27.20 20.83  
129.66ꢀ 80.53ꢀ 50.90ꢀ 92.86ꢀ 61.0ꢀ 41.40ꢀ 71.36ꢀ 48.63ꢀ 34.46ꢀ 64.43ꢀ 39.94ꢀ 29.13ꢀ 51.20ꢀ 33.47ꢀ 24.97 42.0 28.50 21.57  
146.54ꢀ 91.45ꢀ 55.20ꢀ 101.64ꢀ 67.25ꢀ 44.20ꢀ 76.54ꢀ 52.55ꢀ 36.40ꢀ 71.39ꢀ 42.56ꢀ 30.50ꢀ 55.55ꢀ 35.30ꢀ 25.95 44.90 29.80 22.30  
ꢀ 0ꢀ  
5ꢀ  
10ꢀ  
15ꢀ  
20ꢀ  
25ꢀ  
30ꢀ  
35ꢀ  
40ꢀ  
45ꢀ  
50ꢀ  
163.42  
180.30  
243.30  
102.37ꢀ 59.50ꢀ 110.42ꢀ 73.50ꢀ 47.0ꢀ 81.72ꢀ 56.47ꢀ 38.30ꢀ 78.36ꢀ 45.18ꢀ 31.87ꢀ 59.90ꢀ 37.13ꢀ 26.93 47.80 31.10 23.03ꢀ  
113.28ꢀ 63.80ꢀ 119.20ꢀ 79.75ꢀ 49.80ꢀ 86.90ꢀ 60.38ꢀ 40.26ꢀ 85.33ꢀ 47.80ꢀ 33.23ꢀ 64.25ꢀ 39.96ꢀ 27.92 50.70 32.40 23.76  
124.20ꢀ 68.10ꢀ 127.98ꢀ 86.0ꢀ 52.60ꢀ 92.08ꢀ 64.30ꢀ 42.20ꢀ 92.30ꢀ 50.40ꢀ 34.60ꢀ 68.60ꢀ 40.80ꢀ 28.90 53.60 33.70 24.50  
55ꢀ  
60ꢀ  
ꢀꢀꢀ  
68ꢀꢀꢀ  
71ꢀꢀꢀ  
74ꢀꢀꢀ  
77ꢀꢀꢀ  
80ꢀꢀ  
83ꢀ  
9
Installation Diagrams  
EXPOSED WALL  
Blanket exposed  
windows with  
fresh dry air  
Main  
Stale Air  
Intake  
EXPOSED WALL  
HRV  
Min. 10’-0"  
Always attempt to minimize  
short circuiting of air streams,  
(supply fresh air on one side  
of room and exhaust stale air  
from opposite side of room).  
Typical Duct Layout  
Sketch #1  
10  
EXPOSED WALL  
Blanket exposed  
windows with  
fresh dry air  
Stale Air  
Intake  
EXPOSED WALL  
HRV  
Min. 10’-0"  
Always attempt to minimize  
short circuiting of air streams,  
(supply fresh air on one side  
of room and exhaust stale air  
from opposite side of room).  
Typical Duct Layout  
Sketch #2  
11  
Location for Mounting  
The Ductwork System  
The HRV must be located in a heated space  
where the surrounding air temperature does not  
fall below 60˚F (16˚C). The unit must be mounted  
level (horizontal) to obtain proper drainage or  
water from the heat exchange element and drip  
pans. The warranty will be void if these  
conditions are not met.  
A properly designed ducting system will allow the  
HRV to operate at its maximum efficiency. (Air  
flow will be restricted by undersized ducting, use  
of too many elbows, tees, bends, etc.). Always  
try to keep duct runs as short and straight as  
possible.  
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 steams.  
Typically, the HRV is positioned close to an  
outside wall or the roof to simplify the  
connections and keep the length of insulated  
ducting required for the fresh air intake to a  
minimum.  
All joints must be airtight, sealed and impervious  
to moisture. See specification sheets for each  
unit for exact duct sizes and location.  
A minimum clearance of 30 inches (76 cm) in  
front of the HRV is recommended to service the  
heat exchanger cores and the filters. The HRV  
may be mounted on an equipment platform  
providing the drain hoses are clear and there is  
sufficient space to open the doors for servicing.  
To minimize pressure drop and noise, galvanized  
metal ducts, properly sized, 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 equivalent. Use flexible duct  
connectors at the HRV to avoid noise transmis-  
sion.  
Install the drain pans in the bottom of the HRV  
so the drain connections protrude through the  
holes provided. Use drain hoses with hose  
clamps to connect the drain pan outlets to a floor  
drain or standpipe. Make sure the drain line  
slopes down to the outlet. If this is not possible a  
condensate pump will be required for positive  
removal of the water. Protect the drain line from  
freezing.  
All duct joints must be secured with screws,  
rivets or duct sealant and sealed with aluminum  
duct tape to prevent leakage.  
HRV CABINET  
DRAIN  
SPOUT  
DRAIN  
SPOUT  
TAPE  
TEE  
CONNECTOR  
TO DRAIN  
Forming the “P” Trap  
12  
Outside Weatherhoods  
Stale Air Return System  
The weatherhoods must have built-in “bird” screen with  
1/4 in (6.35 mm) minimum mesh to prevent birds and  
rodents from entering into the ductwork. Do not use  
smaller mesh as it will be very susceptible to plugging  
up. Gravity dampers at the vents must not be used as  
they will restrict air flow and often “seize up”. The pre-  
ferred location of the outside weatherhoods is:  
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.  
Alternately, the stale air may be drawn directly from the  
return air duct. When this system is used, the air han-  
dler’s blower must constantly operate. The exhaust  
takeoff connection must be at least a 3 ft (1 m) from a  
directly connected HRV supply duct if both are con-  
nected to the same duct run. Static pressure of the air  
handlers return system should be noted and compen-  
sated for if, it is apparent that the static pressure of the  
return in the air handler will exceed .1 to .15” W.C.  
• no less than 10 ft. (3 m) apart from each other  
• at least 18 in ( 46 cm) above snow line or  
ground level  
• away from sources of contaminants, such as  
automobile exhaust fumes, gas meters, garbage  
cans, containers, etc.  
• not exposed to prevailing winds, whenever  
reasonable possible  
A damper located just prior to the HRV is required to  
balance the stale air exhausted with the fresh air sup-  
ply entering the building.  
The outside perimeter of the weatherhood must be  
caulked to prevent leakage into the building.  
The design and size of the weatherhoods or louvres  
chosen by the installer must allow for adequate free  
area. Water and snow penetration of the system is mini-  
mized when the airflow does not exceed 1000 FPM  
(5.08 m/s) free area velocity.  
Return air suction points should be located on the  
opposite side of the room from the fresh air inlet. The  
inlets may be located in the ceiling or high on the walls  
and fitted with inlet grilles.  
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 ventilator  
allows for economical operation of the HVAC system  
while effectively removing contaminants from the space.  
Ducting from the  
Weatherhoods  
Galvanized sheet metal ducting with sufficient cross sec-  
tion with an integral single piece vapour barrier should be  
used to connect the HRV to the weatherhoods. All duct-  
ing must meet UL Class 1 requirements.  
In designing the exhaust portion of the system the  
exhaust grilles are placed so as to remove the contami-  
nants while not allowing them to enter the breathing  
zone of the occupants.  
A minimum R value of insulation should be equal to 4  
(RSI 0.75)  
A good bead of high quality caulking (preferably acousti-  
cal sealant) and taping with a high quality aluminum foil  
tape is recommended to seal the duct to both the HRV  
and the weatherhood.  
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 chemical data  
sheets.  
Warmside Ducting - General  
Ducting from the HRV to the different areas in the build-  
ing should be galvanized metal whenever possible.  
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. Use “Wye” (Y) fittings instead of “Tees”  
(T) whenever possible.  
All duct joints must be fastened with screws, rivets or  
duct sealant and wrapped with a quality duct tape to pre-  
vent leakage. We recommend aluminum foil tape.  
13  
Fresh Air Supply System  
The fresh air supply ductwork from the HRV may be  
directly connected to the return air duct of the forced  
air system. Check the air flow balance of the HRV with  
the air handler blower both “ON” and “OFF” to  
determine that it does not imbalance the HRV more  
than 10%. Also, it is advisable to include a short length  
of flex duct or other non-metallic connector in this hard  
ducted line in order to keep the HRV acoustically iso-  
lated 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.  
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.  
The use of balancing dampers or adjustable grilles to  
balance the flow rates into various rooms is  
recommended.  
The use of balancing dampers or adjustable grilles  
as supply air diffusers and air exhaust covers are  
recommended. TECHGRILLES™ are round, efficient,  
sound absorbing devices available in 4”, 5”, 6” and 8”  
(100, 125, 150, and 200 mm) models.  
It may be necessary to install a separate fresh air supply  
ductwork system if the heating is other than forced air.  
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 supply voltage  
interrupt when smoke or flame sensors are triggered,  
or when a central fore alarm system is activated.  
AIR FLOW  
SUPPLY  
AIR FLOW  
EXHAUST  
TECHGRILLE  
(optional) schematic  
14  
Various Installation Types  
NOTE: When installing your HRV  
flexible duct connectors should  
be installed between the HRV  
and the galvanized duct work.  
Figure 7A  
Saddle Installation  
Vibration Isolators  
(Supplied by others)  
Threaded  
rod and U channel  
(Supplied by others)  
Hang unit with suspended rods  
and "U" channel members.  
Figure 7B  
Curb Mounted  
Curb is wood or metal  
(Supplied by others)  
May be anchored to  
floor,leaving space  
for drain connections  
Mount unit on wooden or metal  
curb assembly. Unit must be raised  
an adequate height for installation  
and slope of drain lines.  
Figure 7C  
Suspended  
Vibration Isolators  
(Supplied by others)  
PVC Support Straps  
(Supplied by others)  
Unit Suspended using  
Polyester reinforced PVC support straps.  
15  
Electrical Connections  
Automatic Self Test of Defrost  
Systems  
It is recommended that a licensed electrician make all  
electrical connections. It is very important that the  
unit be properly grounded. It is recommended that a  
separate 15 amp/120 volt circuit be used.  
If confirmation of the defrost system is needed,  
complete the following steps.  
1. Disconnect power to the unit and open access/  
WARNING: In order to prevent electric shock when  
cleaning or servicing the HRV, it is extremely important  
to confirm the polarity of the power line that is switched  
by the safety (disconnect) switch whose control arm is  
located on the outside of the electrical control box area.  
The hot line (black) is the proper line to be switched. To  
confirm the proper polarity, use a voltmeter or test lamp  
to make sure there is no power after the switch when  
the door is open. Check between that point and ground  
(on the cabinet). This must be done as occasionally  
some buildings are improperly wired. Always make  
sure the HRV is properly grounded.  
maintenance doors.  
2. Locate the “snap disc” type temperature sensor  
mounted in the upper left hand corner (cold air  
stream) of the HRV.  
3. Disconnect the two wires from the HRV to the  
sensor, at the sensor.  
4. Using a jump wire with alligator clips, join two  
wires from the HRV together.  
5. Close access doors and power the unit.  
This procedure will simulate a defrost that would occur  
automatically in the field when the outside temperature  
drops below -3˚C (27˚F).  
Black  
Power Supply  
Line  
White  
Cord  
Black  
Neut.  
Power  
Terminal  
Block.  
GND.  
Electrical Connection  
DAMPER DEFROST  
These damper defrost HRV’s have an electronically  
controlled damper defrost mechanism. If the outside  
temperature drops below 27˚F(-3˚C ), the defrost timer  
is activated. A motor driven damper door mechanism  
opens the defrost port and at the same time closes off  
the supply air from outside. After approximately 3  
minutes, the damper operates in the opposite direction  
to close off the defrost port and reopen the fresh air at  
the supply port. The 27.5 minute wait time and 3  
minute defrost cycle repeat until the temperature again  
rises above 27˚F (-3˚C).  
16  
Operation of the HRV  
These Recirculating Models of HRV's will provide fresh  
clean air without sacrificing the savings of your energy  
conserving home. When outdoor air is required for pool  
room dehumidification, the aluminum cores of the HRV  
provide effective and efficient heat recovery exchange.  
Whether operating as an HRV or in recirculation mode,  
the energy efficient PSC blower motors provide reliable  
and cost effective operation.  
The exhaust fan to the outside is shut off during this time.  
Outside air does not enter the system until the pool room  
humidity exceeds the setpoint of the dehumidistat.  
The unit has an electronically controlled damper door  
defrost. If the dehumidistat has made its circuit and the  
unit is drawing in outside air, the defrost cycle will  
operate as follows:  
Operation:  
If the outside temperature drops below 27˚ Fahrenheit  
(-3 degrees Celsius) the defrost timer is activated. After  
waiting approximately 27.5 minutes (during which time  
the core unit may experience some frost build-up) the  
timer activates the damper door mechanism which  
closes off the fresh air supply port and opens the  
defrost port. After approximately 3 minutes the damper  
door reverses direction and re-opens the fresh air sup-  
ply port and closes off the defrost port. This cycle  
repeats until the outside temperature again rises  
above 27˚ F.  
Humidity control is provided by an adjustable dehumidistat  
that is mounted in the pool room. The dehumidistat  
(supplied and mounted in the pool room in an accessible  
location 5' above floor level) would be set to a humidity  
level the operator finds acceptable (for example, in a  
range of 45 to 55% R.H.). If the humidity level in the  
room exceeds the setting of the dehumidistat, then  
outside air is brought into the system and humid air is  
removed from the room. If a duct heater or hot water  
coil has been installed in the supply ductwork, this will  
condition the incoming air.  
During the defrost cycle, pool room air is moved  
outside through the unit as well as from the pool room,  
back to the pool room. To handle the required air flow  
capacity, two ducts need to be connected to the pool  
room or one large duct.  
Control of this heater would be by a duct mounted  
thermostat. When the humidity level of the room falls  
to the dehumidistat setpoint, the pool room air is  
recirculated and no outside air will enter the system.  
Pool room air moves through the unit, then to the duct  
heater (optional) and returns to the pool room. Outside  
air is prevented from entering the unit during recirculation  
by the supply damper closing off.  
17  
Ducting Requirements & Mode of Operation  
Ventilation Mode  
Defrost Mode  
In ventilation mode, both motors are running and air is  
being exchanged with the outside through the supply  
and exhaust ducts.  
In defrost mode both the supply and exhaust motors  
run to draw air through the heat exchange cores. This  
mode is automatic and does not require field  
adjustments. Defrost light on side of cabinet illuminates  
to indicate defrost operation.  
Recirculation Mode  
In recirculation mode the supply motor continues to run  
and a damper moves to block off air entering from  
outside, drawing air instead from the conditioned  
space. The exhaust to outside motor is OFF when in  
recirculation mode.  
*NOTE: "Defrost" light is illuminated during  
"Recirculation Mode", indicating damper direction.  
1. VENTILATION MODE  
FRESH AIR FROM OUTSIDE  
EXHAUST TO OUTSIDE  
FROM POOL ROOM (CLOSED)Ø  
ON  
ON  
FROM POOL ROOM  
TO POOL ROOM  
2. RECIRCULATION MODE  
FRESH AIR FROM OUTSIDE (CLOSED)  
Ø
EXHAUST TO OUTSIDE  
FROM POOL ROOM  
FROM POOL ROOM  
Ø
OFF  
ON  
Ø
TO POOL ROOM  
3. DEFROST MODE  
FRESH AIR FROM OUTSIDE (CLOSED)  
Ø
EXHAUST TO OUTSIDE  
FROM POOL ROOM  
NOTE:  
ON  
ON  
The external low voltage  
contacts on a pool unit  
control the Ventilation/  
Recirculation Damper only,  
not low/high speed control.  
FROM POOL ROOM  
TO POOL ROOM  
18  
Speed Selection and Controls  
Air Conditioning (DX) Coil  
Model 1000RHCAC Only  
These recirculation models are equipped with a  
3 speed control, low medium and high, (Note -  
1000RHC/RHCAC must be set to high speed  
when air conditioning is required), as well as a  
lighted on/off switch and a low voltage terminal  
strip. The low voltage terminal strip is used to  
connect the supplied dehumidistat.  
The Direct Expansion (DX) Coil located inside the cabi-  
net is designed to dehumidify the incoming fresh air  
from the outside and is not intended as an air condition-  
ing unit for the space. The coil must be connected to  
an outdoor condensing unit, (this unit or it’s controls are  
not provided by NUTECH). Special care and atten-  
tion should be given to ensure the Model  
1000RHCAC is set to high speed during air condi-  
tioning mode, to avoid the coil from freezing up.  
DEHUMIDISTAT  
END OF UNIT  
ON/OFF SWITCH  
not used  
3 SPEED CONTROL  
t
e
io  
ta  
is  
id  
m
u
g
e
h
in  
id  
ts  
e
tt  
D
e
u
o
t
HIGH  
v
ti  
la  
e
R
C
S
O
s
n
it  
d
n
o
COMMON  
:
R
TE  
IN  
W
idistat  
to 40%  
Set dehum  
een 30%  
.
betw  
e
is too dry,  
If hom  
id,  
adjust to higher setting.  
e
is too hum  
er setting.  
If hom  
adjust to low  
:
ER  
M
UM  
S
idistat  
Set dehum  
FF.  
to  
O
* NOTE: The external low voltage contacts on a pool  
unit control the Ventilation/Recirculation  
PART NO. 99-130W  
Damper only, not low/high speed control.  
•Provides ventilation or recirculation mode  
Hydronic Reheat Coil  
DISCLAIMER  
Model 1000RHC and 1000RHCAC  
The Model 1000RHC and RHCAC is intended to  
be installed by certified HVAC trades people.  
Damage resulting in partial or complete failure of  
the Reheat/Air Conditioning portion is the respon-  
sibility of the installing contractor. Precautions  
should be put into place to avoid these coils from  
freezing or causing the motors to overheat or any  
other unforeseen problem not mentioned here.  
The coil is designed to temper the air delivered  
through the HRV, to room temperature and is not  
a heating appliance for the space.  
Special care and attention should be given to  
selecting a thermostat which will be connected to  
the pump feeding the coil. The thermostats  
function will be to signal the pump to send water  
through the system if temperatures drop below  
40˚F (5˚C) to prevent the coil from freezing and  
also to shut the pump off if the air temperature  
leaving the coil exceeds 77˚F (25˚C) to prevent  
over heating motors.  
The DX Coil is supplied with an orificing device  
suitable for 1.5 tons of air conditioning @ 95˚F  
80% RH inlet air.  
Thermostats and pumps not available from NUTECH.  
19  
Pitot Tube Air Flow Balancing  
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 exhaust-  
ed by the unit. If the air flows are not properly balanced, then;  
Insert the Pitot tube into the duct; pointing the tip into the airflow.  
For general balancing it is sufficient to move the pitot tube around in  
the duct and take an average or typical reading. Repeat this proce-  
dure in the other (supply or return) duct. Determine which duct has the  
highest airflow (highest reading on the gauge). Then damper that air-  
flow 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 multiplied by the cross  
sectional area of the duct being measured.  
• 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  
• Failure to balance HRV properly may void warranty  
Excessive positive pressure may drive moist indoor air into the  
external walls of the building where it may condense (in cold weather)  
and degrade structural components. May also cause key holes to  
freeze up.  
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.  
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.  
The 6" duct has a cross sectional area of = [3.14 x (6"÷12)2]÷4  
= 0.2 square feet  
Read the Application Warning on the front of this manual!  
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.  
The airflow is then:  
640 ft./min. X 0.2 square feet = 128 cfm  
For your convenience, the cross sectional area of some common  
round duct is listed below:  
DUCT DIAM. (inches)  
CROSS SECTION AREA (sq. ft.)  
4. Unit is on HIGH speed.  
5
6
7
0.14  
0.20  
0.27  
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  
thegrilles 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.  
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.  
7. Return unit to appropriate fan speed for normal operation  
Pitot tube and gauge  
Balancing Procedure  
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 ductwork. Procedure should be performed with the HRV on high  
speed.  
DUCT  
AIR FLOW  
Pitot Tube 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 maximum pressure that the HRV will need to overcome, and allow  
for a more accurate balance of the unit.  
Balancing Kit  
Pitot tube  
c/w magnehelic gauge,  
Pitot tube, hose and  
carry case.  
PART NO. 99-167  
Magnehelic gauge  
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.  
Place pitot tube a minimum of 18" from blower or elbows  
These are recommended distances  
but the actual installation may limit the  
amount of straight duct.  
Outdoors  
HRV must be in ventilate  
mode when balancing  
proceedure is performed  
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, prefer-  
ably 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 connected to the  
low pressure or reference side of the  
gauge.  
Pitot  
tube  
Magnehelic  
gauge  
Pitot  
tube  
Magnehelic  
gauge  
Note: Duct connections may vary,  
depending on model.  
20  
Service/Maintenance  
Servicing your HRV on a regular schedule will  
result in optimum operating efficiencies and  
prolonged life of the equipment.  
HRV Core  
The heat exchange core is accessible through the  
front service door. Special care and attention should  
be given to this component as the edges may be  
sharp, and the core itself susceptible to damage  
if dropped.  
Due to numerous applications in which this  
equipment can be installed, it is difficult to predict  
servicing intervals. In certain situations where there  
is heavy smoke, servicing the equipment every one -  
two months may be needed; whereas ventilating a  
meeting room for example for carbon dioxide may  
only need service every six months to a year.  
When removing the core, the location it is removed  
from should be noted.  
The core is removed by carefully pulling the core out-  
ward from the unit, sliding it evenly along its “H chan-  
nel” supports found in each corner of the core. Note  
the core may have some resistance when  
sliding out. Avoid tilting the core as this will result in  
its edges catching the H channel and temporarily  
preventing its removal.  
Motor  
Access to the motor is through the front service  
doors. Note heat exchanger core can be removed to  
provide more room. See CORE in this section.  
The motor is a permanent split capacitor type (PSC)  
which uses a sleeve mechanism to steady the shaft.  
There is an oil wick beside the sleeve which supplies  
oil to it on a continuous basis.  
In most cases, washing the core in a mild  
detergent and warm water will be all that  
is needed to completely clean them. Do not use  
harsh chemicals as this may cause corrosion in the  
HRV. The time between core service will depend  
on the application the HRV has been installed in.  
It can be as often as one - two months or at the very  
least, cleaned every six months. When reinstalling  
the core you must note foam location and drip  
edge location for proper core placement.  
If the motor does not have oil tubes, no maintenance  
is required.  
Access to the wick is through oil tubes, (two per  
motor) located in the motor case itself. These oil  
tubes are either capped with yellow plugs, (which  
need to be removed for oiling) or have clear tubes  
protruding from them.  
See diagram below.  
In either case an oiling device such as an “Oil  
Telespout” filled with 20 S.A.E. non-detergent electric  
motor oil should be used to put oil inside the tubes. A  
couple of drops of oil once a year will do.  
DO NOT OVER OIL!  
Models 700, 1200 and 1000  
FILTER  
DOUBLE  
DRIP EDGE  
CORE  
DOUBLE  
DRIP  
EDGES  
FILTER  
DRAIN PANS (
Note location and arrangement of cores and filters when removing.  
21  
FILTERS  
DUCT WORK  
Open front service door to access the filters  
located in both supply and exhaust air streams.  
Note to remove and install filters, it may be easier  
to first remove the core(s). See CORE.  
It is a good idea to inspect ducting, outside  
weather hoods (wall caps), and grilles for blockage  
and dirt buildup, at least every six months.  
Outside weather hoods should be protected by a  
rodent screen which can plug up with debris.  
Also, it is a good idea to visually confirm that  
the fresh air supply is free from any sources of  
contamination, such as other vented combustion  
equipment added after the fact.  
The filters are designed to stop large particles  
from entering in the core. The filters are fastened  
in place by a metal spring rod. To remove filters  
from core(s) simply pull the rod from one end,  
outward until free from core lip, and remove.  
Only use warm water with a mild detergent to  
wash the filters. Do not use harsh chemicals.  
DAMPER MOTOR  
The damper motor, (if applicable) is a self  
contained motor and does not require service.  
The damper door attached to the motor could use  
a little lithium grease on the shaft opposite the  
motor, where it enters its holder, once every  
two - three years.  
The time between filter service will depend on the  
application the HRV has been installed in. It can  
be as often as one - two months or at the very  
least, cleaned every six months.  
CONDENSATE DRAINS  
The condensate drains consist of two drain pans General Maintenance  
which may collect water after the HRV initiates a  
defrost cycle, and a drain line to remove the  
condensate.  
As a final step in a routine maintenance  
schedule, it is a good idea to confirm operation of  
the system, checking speed control functions and  
remote control operation, if applicable.  
Maintenance on this portion of the system should  
be done as often as possible and should not  
exceed six months. Note bacterial growth in  
standing water is a major concern to healthy  
indoor air quality, and should be avoided whenever  
possible.  
Wipe the inside of the cabinet to remove dust and  
cob webs as needed.  
It is a good idea to keep a service/maintenance  
log of the unit.  
To clean these components, open the front  
service door and flush the pans with water.  
Ensure that the pans drain completely and in a  
reasonable amount of time. Note if the water  
does not drain right away, check for blockage in  
the drain line, also check that the drain line has a  
good slope to it. (1/8 - 1/4” per foot)  
The drain line itself should have a “P” trap in it  
below the HRV which is to be filled with water to  
prevent odours or gases from entering back into  
the unit. When flushing out the drain pans, this  
too will be flushed out, and the water that was  
there will be replaced with clean water.  
22  
Troubleshooting Your HRV System  
SYMPTOM  
CAUSE  
SOLUTION  
Poor Air Flows  
• 1/4” (6 mm) mesh on the outside hoods is plugged  
• filters plugged  
• clean exterior hoods or vents  
• remove and clean filter  
• core obstructed  
• remove and clean core  
• house grilles closed or blocked  
• dampers are closed if installed  
• poor power supply at site  
• ductwork is restricting HRV  
• improper speed control setting  
• HRV airflow improperly balanced  
• check and open grilles  
• open and adjust dampers  
• have electrician check supply voltage at house  
• check duct installation  
• increase the speed of the HRV  
• have contractor balance HRV  
Supply air feels cold  
• poor location of supply grilles, the airflow may irritate  
the occupant  
• locate the grilles high on the walls or under the baseboards,  
install ceiling mounted diffuser or grilles so as not to directly  
spill the supply air on the occupant (eg. over a sofa)  
• turn down the HRV supply speed. A small duct heater  
(1kw) could be used to temper the supply air  
• placement of furniture or closed doors is restricting the  
movement of air in the home  
• outdoor temperature extremely cold  
• if supply air is ducted into furnace return, the furnace fan  
may need to run continuously to distribute ventilation  
air comfortably  
Dehumidistat is not Operating  
• improper low voltage connection  
• external low voltage is shortened out by a staple or nail  
• check dehumidistat setting it may be on OFF  
• check that the correct terminals have been used  
• check external wiring for a short  
• set the dehumidistat at the desired setting  
Humidity Levels are too High  
• dehumidistat is set too high  
• set dehumidistat lower  
Condensation is appearing on the windows  
• HRV is undersized to handle a hot tub, indoor pool, etc.  
• lifestyle of the occupants  
• cover pools, hot tubs when they are not in use  
• avoid hanging clothes to dry, storing wood and venting clothes  
dryer inside. Heating wood may have to be moved outside  
• vent crawl space and place a vapour barrier on the floor  
of the crawl space  
• moisture coming into the home from an unvented or  
unheated crawl space  
• moisture is remaining in the washroom and kitchen areas  
• ducts from the washroom should be sized to remove moist  
air as effectively as possible, use of a bathroom fan for  
short periods will remove additional moisture  
• on humid days, as the seasons change, some condensation  
may appear but the homes air quality will remain high with  
some HRV use  
• condensation seems to form in the spring and fall  
• HRV is set at too low a speed  
• increase speed of the HRV  
Humidity Levels are too Low  
• dehumidistat control set too low  
• blower speed of HRV is too high  
• lifestyle of occupants  
• set dehumidistat higher  
• decrease HRV blower speed  
• humidity may have to be added through the use of humidifiers  
• have a contractor balance HRV airflows  
• HRV air flows may be improperly balanced  
HRV and / or Ducts Frosting up  
• Note: minimal frost build-up is expected on cores before  
unit initiates defrost cycle functions  
• HRV air flows are improperly balanced  
• malfunction of the HRV defrost system  
• have HVAC contractor balance the HRV  
• using the self-test feature at the Base Module, press the fan  
control symbol, the damper defrost unit should cycle its full  
travel when working properly.  
Condensation or Ice Build Up in Insulated Duct to  
the Outside  
• incomplete vapour barrier around insulated duct  
• a hole or tear in outer duct covering  
• tape and seal all joints  
• tape any holes or tears made in the outer duct covering  
• ensure that the vapour barrier is completely sealed  
Water in the bottom of the HRV  
• drain pans plugged  
• improper connection of HRVs drain lines  
• HRV is not level  
• ensure O-Ring on drain nozzle sits properly  
• look for kinks in line  
• check water drain connections  
• drain lines are obstructed  
• HRV heat exchange core is not properly installed  
23  
• make sure water drains properly from pan  
DfeondSwitch  
CralngSwitch  
N
B R O W  
B L A C K  
B L A C K  
H I W T E  
H I W T E  
B L A C K  
H I W T E  
B L A C K  
H I W T E  
B L A C K  
H I W T E  
B L A C K  
O R A N G E  
H I W T E  
H I W T E  
O R A N G E  
O R A N G E  
B L U E  
R E D  
B L A C K  
O R A N G E  
Y E L L O W  
W H I T E  
C A P A C I T O R S  
F A N M O T O R  
H I W T E  
B L A C K  
B L A C K  
H I W T E  
C A P A C I T O R S  
F A N M O T O R  
B L U E  
R E D  
H I W T E  
B L A C K  
B L U E  
B L A C K  
R E D  
B L U E  
B L A C K  
R E D  
R E D  
H I W T E  
Y E L L O W  
B L U E  
B L A C K  
24  
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 purchase 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 nor-  
mal 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 customer 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 CONSE-  
®
QUENTIAL 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 WAR-  
RANTIES, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTY OF MER-  
CHANTABILITY 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  
25  

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