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AIR FLOW BALANCING (CONT'D)
1 For this flow measuring station, cut
the duct and place the flow
measuring station between each
station. 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.
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.
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.
B
Measure
here
Measure
here
18”
(457 mm)
18”
(457 mm)
• To avoid airflow
turbulence and incorrect
readings, the airflow
velocity should be
measured on steel
ducting a minimum of
18” (457 mm) from the
unit or elbow and before
any transition.
ELECTRONIC BALANCING MOTORS [HRV 150D & 200D only] -
Motors will be factory set at their full potential depending on speed selected.
When unit is installed you will need to balance the motors for proper operation.
Insert screwdriver and turn clockwise to slow down the motor, you will notice the motor changing speeds
while performing this operation. Set to desired cfm.
Fan
+-
Use slot screwdriver to
adjust speed/airflow
AIRFLOW STATION (GRID) METHOD
ADJUSTING AIRFLOWS