Airflow Adjustment & Balancing - Fantech VHR 704 Manuel D'installation

Installing drain line
Through normal operation and during its defrost mode, the HRV may produce some condensation. This water should flow into a nearby drain, or be taken
away by a condensate pump. The HRV and all condensate lines must be installed in a space where the temperature is maintained above the freezing point.
A "P" trap should be made in the drain line. This will prevent odors from being drawn back up into the unit.
1 Install the drain nipple.
Secure the condensate line to the drain connection using a tie wrap or other appropriate method.
Airflow adjustment & balancing
Fantech's superior design and use of EBM Motors results in a steep fan curve that usually does not require balancing. Commissioning the system
after installation is recommended which include confirming the proper operation of the system and how it interacts with other components within the
home.
Airflow station (grid) method
B
1 For this flow measuring station, cut the
duct and place the flow measuring station
between each section of duct. Make sure
that the flow measuring station's air
direction arrow points in the direction of
the airflow. Secure the flow measuring
station with duct tape.
12"
(300 mm)
Measure
here
2 Before taking the reading, make sure that
the magnehelic gauge is level and at 0.
Refer to the flow measuring station's
chart to determine your unit's airflow
velocity.
• To avoid airflow turbulence and
incorrect readings, the airflow
velocity should be measured on
12"
steel ducting a minimum of 12"
(300 mm)
(300 mm) from the unit or elbow
and before any transition.
Measure
here
2 Install the drain hose,
making a "P" trap
3 Adjust the "Supply Air Out" damper until
you reach the desired velocity. Follow the
previous steps to adjust the "Exhaust Air
Out" damper, if needed.
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