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8

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 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

* Failure to balance the HRV may void warranty

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.

4. Unit is on high speed.

5. 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.

6. Return unit to appropriate fan speed for normal operation.

Balancing Procedure

The following is a method of field balancing an HRV using
a Pitot tube, advantageous in situations when flow sta-
tions are not installed in the ductwork. Procedure should
be performed with the HRV on high speed.

Choose the straightest section of duct between the HRV
and the weatherhoods. This will be used for both the sup-
ply and return ducts.

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 recommend-
ed 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 reso-
lution. 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.

Insert the Pitot tube into the duct, pointing the tip into the
airflow.

Installation

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Страница 1: ...here to find information on every feature of this unit along with easy to understand operating instructions If however you do encounter a question that is not covered in this Guide you should call the Lifebreath dealer who installed your fur nace Chances are that he will be able to give you a satisfactory answer but if he is unable to do so then we invite you to contact us directly The purpose of ...

Страница 2: ...corrosion resis tance Dimensions Clearances Options 99 186 Weatherhoods Two 6 c w 1 4 mesh screen 99 130W Remote Wall Mount Dehumidistat Control 24 VAC only 99 122 6 Balancing Damper 99 RSK6 6 Backdraft Damper Warranty Units carry a lifetime warranty on the heat recovery core and a five year replacement parts warranty on all other components Specifications 18kw 60 000 BTUH Voltage 240 VAC 60 Hz Hp...

Страница 3: ...orrosion resistance Dimensions Clearances Options 99 186 Weatherhoods Two 6 c w 1 4 mesh screen 99 130W Remote Wall Mount Dehumidistat Control 24 VAC only 99 122 6 Balancing Damper 99 RSK6 6 Backdraft Damper Warranty Units carry a lifetime warranty on the heat recovery core and a five year replacement parts warranty on all other components Specifications 18kw 60 000 BTUH Voltage 240 VAC 60 Hz Hp 1...

Страница 4: ...4 Figure 1 Blower Performance Curve ...

Страница 5: ...eed to be ducted to the outside air Sufficient clearance around the unit is required for service of the filter heat recovery core and components Duct Connections To accommodate various installations the Clean Air Furnace has knockouts for the return air plenum and ven tilation ducts on both sides of the cabinet Special care and attention should be given to determining which knock outs are to be re...

Страница 6: ...ducting or ridged pipe wrapped in pipe sleeve is required to prevent condensation from occurring on the pipe Also the airflow in these lines is designed to be bal anced See Balancing Airflows in this manual for damper location and procedure Warning A backdraft damper is required in the exhaust air duct to prevent cold air from entering the unit when the Clean Air Furnace is not running Fig D Page ...

Страница 7: ...ommo date the balancing damper as required in the Balancing Procedure in this manual After installing the dampers the small section of pipe can be fastened to the port collars The ductwork from the outside weatherhoods to the unit is usually flexible ducting although rigid pipe may be needed if the runs are greater than 20 feet In either case the pipes both exhaust and supply and the added fitting...

Страница 8: ...nit to appropriate fan speed for normal operation Balancing Procedure The following is a method of field balancing an HRV using a Pitot tube advantageous in situations when flow sta tions are not installed in the ductwork Procedure should be performed with the HRV on high speed Choose the straightest section of duct between the HRV and the weatherhoods This will be used for both the sup ply and re...

Страница 9: ...he 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 The airflow is then 640 ft min x 0 2 square feet 128cfm For your convenience the cross sectional area of some common round duct is listed below DUCT DIAM inches CROSS SECTION AREA sq ft 5 0 14 6 0 20 7 0 27 The accuracy of the airflow r...

Страница 10: ...e has two drain pans for removing condensation which may occur on the heat recovery core during cold weather See Fig 5 for connection Figure 5 Drain Line Diagram DRAIN SPOUT TAPE THROUGH KNOCKOUT TO DRAIN TEE CONNECTOR DRAIN SPOUT 2 KNOCKOUT KNOCKOUT Installation ...

Страница 11: ...145 PMC 012 DEC 010 CTR 090 CLG 010 CP1 054 1 1 1 1 1 1 1 4 1 QTY CM 1 CAF 010 15 AMP 240V DFS 221 112 CLEVELAND PRESSURE DIFFERENTIAL SWITCH PDS IMPORTANT WIRE IN ACCORDANCE WITH LOCAL AND CANADIAN ELECTRICAL CODES READ CAREFULLY INSTALLATION INSTRUCTION BEFORE WIRING AND OPERATING LEGEND A AUTOMATIC RESET CUT OUT THR THERMAL RELAY T CONTROL CIRCUIT TRANSFORMER E1 E4 HEATING ELEMENTS CH BLOWER RE...

Страница 12: ...Note For ECM motors refer to note located on this page regarding high speed fan operation 5 After balancing the ventilation according to instructions set the thermostats fan switch to auto On auto the fan will run continuously at a low speed if the ventila tion switch fig 6 is in the continuous mode until heating or cooling is called for and then will switch to a higher speed On manual the fan wil...

Страница 13: ...blower will return to its low speed Continuous low speed is selec table fig 6 Ventilation The heat recovery ventilation HRV portion of the Clean Air Furnace is automatic Once set a desired amount of fresh air will be drawn into the home while the fur nace blower is activated To reduce humidity increased ventilation may be required An optional remote dehumidistat can be installed The dehumidistat w...

Страница 14: ...cording to manufactures recommendations 3 Check the drain line for kinks 4 Make sure that the O ring in the drain nozzles sit flat 5 Ensure the drain line has enough fall to it Condensation ice forming inside ventilation ducts A rip in the vapor barrier or poorly sealed joints may cause condensation or ice to form on the ducting If this occurs replace the entire line Humidity levels are too low 1 ...

Страница 15: ...15 Date Particulars Maintenance and Service Record ...

Страница 16: ......

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