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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
10.2 Balancing Procedure: NU0508/NU800, NU0912/NU1200, NU1316/NU1600
For units with the larger, fractional horsepower motors, electronic speed adjustment using the
method described above has been disabled. Instead use mechanical dampers to reduce the
airflow to the desired flow rate.
11 Maintenance
Note: The following are minimal service guidelines. More frequent maintenance will be
required depending on service application and conditions. CAUTION: Disconnect power before
servicing.
Filters
Dirty filters can reduce ventilation efficiency, result in unbalanced airflow and damage or
shorten the life of the motors. Clean at least every three months. Polyester filters should be
vacuumed, not washed, and replaced annually. Filters remove easily by opening the front cover.
Fans
When cleaning the filters, take the opportunity to vacuum any interior surfaces including the fan
blades.
Condensate Drain
Twice per year wipe clean the condensate drain pan. Check the condensate drain and tubing to
ensure they are free flowing. The tubing must have an "S" or loop that traps a quantity of water
to prevent air from entering the HRV via this tubing.
Core
The core (heat/energy exchanger) should be removed and cleaned at least once a year. Use a
non-corrosive enzyme detergent in cold water (i.e. Arctic Power). To remove the cover of the
machine, unlatch and slide the door to the right to release from the hinges. Slide the core
forward to remove it from the HRV.
Exterior Hoods
Regularly check the outside vents and clean any obstructions such as grass, leaves or other
debris. Do not replace the screen with mesh smaller than 1/4" as this will restrict airflow. During
winter operation, ensure snow and frost does not build up and restrict or block openings.
Rev 2.3 July 17, 2017
21
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