Nu-Air ES170 - System Airflow Balancing

Nu-Air Ventilation Systems Inc. - HRV Operating & Installation Manual
Rev. 3.4 Sept. 20, 2011 - 12 -
3.7. Balancing the System: High and Low Speed
Balanced air flow between the supply and exhaust air streams is essential to the performance of an HRV
or ERV. With the ES Series, 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.
For High-Speed Adjustment/Balancing, use the following procedure:
1. Models built before August, 2011 (serial number up to/including:
ES1001108428, ES1701108425): Use and ES-M1 control and select “Hi”
for high speed. Otherwise, use a jumper wire between R1/R2 and SB and a
jumper wire between R1/R2 and TS terminals to initiate high speed.
Remove the jumper wires after balancing (see illustration right).
Models built from August, 2011 (serial number higher than those noted
above): Use any means to initiate high speed (e.g. ES-M1, R—H jumper wire,
or 24V R—H control) may be used.
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.
Low-Speed Adjustment/Balancing. If low speed adjustment is desired, follow the same process to
adjust high speed, but use a jumper wire or remote control to put the unit into low speed to make low
speed adjustments.