1.
SYSTEM FUCTION/OPERATING TIPS
A.
Powerful, centrifugal blowers bring fresh air into your
home while an equal amount of stale, humid air is
exhausted to the outside. This is
NU-AIR
’s balanced
central ventilation system.
B.
Incoming fresh air is filtered before flowing through
the heat exchange core.
C.
Stale, humid air flows through the cross-flow heat
exchanger and transfers energy to the incoming fresh
air. The air streams do not mix.
D.
Tempered fresh air is distributed to the house through
an independent or shared (furnace) duct system.
Why Ventilate?
Modern homes are particularly well-sealed and well-insulated from the outside, i.e. they are very “tight”.
As such, tights homes tend to trap odours and other indoor pollutants like excessive moisture, volatile
organic compounds (VOCs) from paints, cleaners, furniture and building materials. An HRV or ERV
acts like the lungs of the home, delivering fresh, filtered outdoor air while remove stale, polluted air.
Operating Your System
Depending on the presence of/type of controls used in your installation, your ventilator is capable of the
following modes of operation:
Standby.
The unit is idle and responds to high-speed demands from a timer, dehumidistst, CO2 sensor,
etc.
Full-Time Low Speed.
The unit operates in low speed all the time and will go to high speed with a
command from other controls in the system, such as a timer, dehumidistst, CO2 sensor, etc.
Full-Time High Speed.
The unit runs in high speed on command from a central control or timer.
Timed High Speed.
Timers operate the unit in high speed for 20 or 20-40-60 minute intervals.
20 Lo/40 Standby.
The unit runs in a cycle of 20 minutes in low speed, followed by 40 minutes of
standby.
20 Lo/40 Recirculation.
The unit runs in a cycle of 20 minutes in low speed, followed by 40 minutes of
recirculating air within the home.
Full-Time Recirculation.
The unit continuously recirculates air within the home. While not ventilating,
this mode can help prevent air in the home from feeling stagnant and offers some level of air filtration.
In a basic sense, it is recommended that the unit run on low speed at all times to ensure a steady supply
of fresh air and removal of indoor pollutants.
However, how much a home needs ventilation can
depend on several factors such as number of inhabitants, cooking habits, hobbies, presence of
pets, opening windows, etc.
so no two households are necessarily the same for the amount and
frequency of ventilation they need. Observance of moisture on windows, lingering odours and a
sensation of stuffy, stagnant air are all signs for the need of ventilation in general or increased
ventilation in specific cases. The controls for your ventilation system might vary in features, but offer
means to regulate how much and how often the home is ventilated.
Some controls are equipped with a dehimidstat, or “d-stat”. A d-stat monitors ambient relative humidity
(RH) and has selectable settings, generally 30%-80% RH. When ambient humidity is detected above the
