system – work closely with the
controls contractor or whoever is
setting up these systems to make
sure they understand the way that
your buildings are occupied, your
schedules and what you want to
With that in mind, here are five
trends in the HVAC industry that
aim to help improve the efficiency
of your building.
Even if you’ve selected the per- fect HVAC sensor for your
building, you won’t get a reliable
measurement unless you install it
correctly, explains Justin Walsh, an
application sales engineer at Vaisala.
“Precise measurement and control
produces efficiency and promotes
conservation,” he says.
Below are five common pitfalls to
avoid when installing an HVAC sensor, as told by Walsh in a BUILDINGS
Education course ( bit.ly/2QQIlgI).
1. Mounting a sensor in an area
with restricted airflow. Don’t install
your sensor in places like behind
a door or somewhere obstructed
by other objects in the space. You
want to choose a representative
location with free airflow and away
from sources of thermal interference.
Place a sensor at respiratory height,
usually between 4-6 feet.
2. Mounting a sensor near a heat
source. Make sure your sensor isn’t
near any equipment that produces
heat, such as a radiator, heating
duct, or even above an office printer
or copier. Consider sunlight at all
points during the day, and avoid
placing it in direct sunlight.
3. Mounting a sensor sideways.
If mounted in this orientation, hot
air won’t be able to escape. Any
heat generated by electronics flows
upward, so make sure your sensor is
mounted in the correct orientation.
When hot air escapes, fresh air can
flow through. If it doesn’t, the reading will be at a higher temperature
and lower humidity than it should be.
4. Mounting a sensor directly
on concrete or steel. These materials conduct heat and will act as a
heat source for any sensors directly
mounted on them. To avoid measurement errors, place insulation
behind the sensor.
5. Mounting a sensor outside
without proper requirements. As
outdoor sensors grow in popularity, be sure that, if you choose this
option, you’re following the product
requirements to keep it safe. Does it
need to be shaded, shielded or vented? One main challenge is measurements being affected by solar heat.
Shield it with a reflector solar radiation shield, which can also function
as a rain shield. Dirty shields absorb
more heat, so make sure you clean
it regularly. Mount it where the wind
isn’t blocked. Walsh recommends
mounting it on a northwest corner,
to take advantage of the shade and
wind. Don’t mount sensors under
INSTALLED ON THE ROOFTOP
OF OISHEI CHILDREN’S
HOSPITAL are eight Ventrol
AHUs. The units deliver upwards
of 80,000 cubic feet per minute
and provide steam, chilled water
MAKE SURE your sensor is in a representative
space with free airflow and away from
sources of thermal interference. Place it at
respiratory height, usually between 4-6 feet.
IF INSTALLED CORRECTLY, precise
measurement and control from your sensor
will lead to better efficiency.
Common Pitfalls of
Installing HVAC Sensors