Venmar FAE115 Installation And User Manual - Balancing Procedure
10
1. Set the furnace blower to high speed.
2. Place the magnehelic gauge on a level surface and adjust it to zero.
3. Connect tubing from gauge to flow collar in exhaust air stream at
location A (Figure 5 on page 9).
Be sure to connect the tubes to their appropriate
high / low fitting.
If the gauge reading drops to below zero, reverse the tubing
connections.
Note: it is better to start with the exhaust air flow reading
because the exhaust typically has more restriction than the
fresh air.
Hold or place the magnehelic gauge upright and level. Record the
reading.
4. Move tubing to the other side of the unit (location B in Figure 5
on page 9) 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. If the furnace has a low speed option, select the low speed option
and check if the fresh air flow and the stale air flow are still
balanced.
6. Remove flow collars, reconnect the duct and 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
LOW HIGH
FLOW
VP0003
LOW HIGH
FLOW
VP0004