5. Calculating % Outside Air
HVAC systems use a combination of outside air, supply air, and return air to maintain
consistent and comfortable air quality. The 1010 can calculate outside air either by
measuring temperature or by measuring CO2.
The formula used to calculate % outside air is:
Percent outside air can be calculated using either temperature or carbon dioxide.
5.1 % Outside Air (Temperature)
1) Place the sensor of the 1010 perpendicular to the “Return” air flow. When the
To activate % outside air mode, press the
key about 2 seconds until “t-0” is
displayed in the middle display area.
reading stabilizes press the
key and capture the return air temperature,
"t-1" is displayed.
2) Place the sensor of the 1010 perpendicular to the “Supply” air flow. When the
reading stabilizes press the
key and capture the supply air temperature,
"t-2" is displayed.
3) Place the sensor of the 1010 perpendicular to the “Outside” air flow. When the
reading stabilizes press the
key and capture the outside air temperature,
"t-3" is displayed.
4) Press the
key, "t =" will be displayed and the calculated percent outside
air will be displayed at the top of the display.
5) If you want to perform this measurement again, press the
key once and
return to step 1.
6) To exit and return to normal operation, press and hold the
key until “C-0”
is displayed. Press and hold the
key until a beep is heard and the 1010
returns to normal operation.
5.2 % Outside Air (Carbon Dioxide)
1) Place the sensor of the 1010 perpendicular to the “Return” air flow. When the
To activate % outside air mode, press the
key about 2 seconds until “t-0” is
displayed in the middle display area. Press and hold the
reading stabilizes press the
key and capture the return air temperature,
"C-1" is displayed.
2) Place the sensor of the 1010 perpendicular to the “Supply” air flow. When the
reading stabilizes press the
key and capture the supply air temperature,
"C-2" is displayed.
3) Place the sensor of the 1010 perpendicular to the “Outside” air flow. When the
reading stabilizes press the
key and capture the outside air temperature,
"C-3" is displayed.
4) Press the
key, "C =" will be displayed and the calculated percent outside
air will be displayed at the top of the display.
5) If you want to perform this measurement again, press the
key once and
return to step 1.
6) To exit and return to normal operation, press and hold the
key until
a beep is heard and the 1010 returns to normal operation.
key until “C-0” is
displayed.
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