Balancing Procedure: Nu0103/Nu305, Nu0305/Nu500, Nu0406/Nu600 - Nu-Air NU0103 Operating, Maintaining & Installing

460 Air Meter: (Nu-Air Part #100460).
1. Drill a ¼" hole in both the supply and exhaust ducts on the warm-side of the
machine at least 12" away from the HRV and any elbows, tees, etc.
2. Set the H/ERV on high speed.
3. Take a pressure reading in each duct and record the results.
4. Go back to the duct having the higher reading, and using the motor speed
control buttons reduce the airflow down until the pressure reads to within 10%
of the other air flow.
5. Use tape to reseal the holes.
6. To convert pressure readings to airflow (cfm or L/s) refer to the instructions
and table included with the air meter.

10.1 Balancing Procedure: NU0103/NU305, NU0305/NU500, NU0406/NU600

Balanced air flow between the supply and exhaust air streams is essential to the performance of
an HRV or ERV. Changing motor speeds or balancing is quick and simple with two buttons
recessed slightly into the unit's cabinet. NO BALANCING DAMPERS ARE REQUIRED. Be
sure to close windows and doors, and turn off all exhaust fans/appliances during the balancing
procedure.
High-Speed Adjustment/Balancing:
1. Use any means to initiate high speed (e.g. ES-M1 control, R—H jumper wire, or 24V
R—H control) may be used. Remove the jumper wires after balancing.
2. Press and hold either the FRESH air or EXHAUST air pushbuttons (not both) for 3
Seconds. Releasing the push-button places the unit in SPEED ADJUST MODE.
3. Now press the corresponding pushbutton to
adjust the fresh air fan or the exhaust fan,
thereby changing the air flow. Each press
will reduce motor speed until the default
minimum is reached, at which point the
motor will return to its peak speed. Allowing
a brief pause between presses (about 0.5
seconds), you will press the adjust button
about 70 times before reaching minimum
speed. During the balancing procedure, you
can switch between adjusting the fresh air
motor or exhaust air motor.
4. To exit balancing/speed adjust mode, stop pressing buttons for 10 seconds. This will
place the unit back in operating mode with the new speeds saved to the circuit board's
memory.
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