7.0 Air Flow Balancing
(cont’d)
4.
Move tubing to the other side of the unit (location B in Figure 20 on page 21) and note reading.
Adjust the fresh air balancing damper F until the reading at B is approximately the same as the
reading at A.
If the reading at B is less than the reading at A then go back and adjust the exhaust balancing
damper G to equal the fresh air flow.
5.
Remove flow collars and reconnect the duct, then, seal with duct tape. Write the required airflow information on a label and stick it
near the unit for future reference: (date, maximum speed airflows, your name and phone number and business address).
NOTES:
• Most flow collar kits provide a conversion chart situated on the collar which enables you to convert magnehelic gauge readings to
equivalent cfm values.
• A difference of ± 10 cfm ( ± 0.015 inches water gauge) between the 2 readings is considered balanced.
• If you are using only one flow collar, then, after completing the first reading, transfer this measuring device to the other side of the
unit and take the second reading.
Balancing procedure
(cont’d)
LOW
HIGH
FLOW
LO
VP0004
24
8.0 Maintenance
1)
Motor: The motor is factory lubricated for life. Lubricating the bearings is not recommended.
2)
The heat recovery core must be handled with care. We recommend that it be washed once a year, following the season of most
intense use, in order to insure maximum efficiency of the plastic partitions.
Allow the heat recovery core to soak for 3 hours in a solution of warm water and mild soap. Rinse under a heavy stream of water.
3)
The air filters are washable. Under normal conditions, we recommend that they be washed every 3 months.
Use a vacuum cleaner to remove the heaviest portion of accumulated dust.
Then wash in lukewarm water.
4)
Regularly check the screen on the exterior intake hood and clean when necessary. Also check during very cold weather because
ice may grow on the screen located at the exterior intake hood.
8.1 Regular Maintenance
Annual service should include:
1)
Cleaning filters, heat recovery core and the exterior air intake/exhaust hood.
2)
Cleaning the wheels and the blower blades.
3)
Cleaning the condensation tray with soapy water (make certain that the drain is not clogged).
4)
Running the system and checking the different operating modes.
5)
Measuring and calibrating rates of flow using the procedure descriptions in section 7.0.
8.2 Prolonged Maintenance
WARNING
Risk of electric shock. Before performing any maintenance or servicing, always disconnect the unit from its
power source.
!
CAUTION
Hot water and a strong detergent will damage the heat recovery core.
CAUTION
Even a partial blocking of this air vent could cause the unit to malfunction.
CAUTION
Because the unit is suspended, two people are recommended to remove or install the heat recovery core. Do not
hold the heat recovery core using its plastic extrusions as handles.
