BTU VENTILATION CORPORATION ● OFFICE 888-884-8070 ● FAX 218-346-7485 ●
www.btucorp.com
XT-70 Control Panel 106
The PID loop will try to control temperature by varying the speed of the exhaust fans from the
Min setting to the Cooling setting. The Door Open position will vary from 0 to 100 percent but
the exhaust fans will vary only between Min and Cooling percentages.
Purge Cycle using Exhaust & Intake Fans:
Purge config 7 is best suited to this type of building. Purge 7 requires a CO2 sensor and will
purge without any heat. See previous page for explanation of purge 7 or Cold Purge. In this
case instead of the fresh air doors opening up to the max door setting, the exhaust fans will
speed up to the max open setting. Once the CO2 has dropped to below CO2 Setpoint minus
C02_diff, the exhaust fans will drop down in speed.
The intake fans will only be used when the exhaust fans reach a high enough speed that the
roof vents can no longer provide enough air. The Aux 1 switch controls the intake fans. If the
switch is in auto, the intake fans will start when the exhaust fans reach a given percentage.
To Next Page
Loading...