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BTU VENTILATION CORPORATION
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OFFICE 888-884-8070
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FAX 218-346-7485
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www.btucorp.com
XT-70 Control Panel
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HMI SETPOINT RAMP
The SETPOINT RAMP screen allows the user to set up the ramp function. The ramp function will allow the set-
point to be automatically incremented to a target setpoint. An example of this could be seen in the fall. Once
suberization has taken place, the ramp function could automatically drop the setpoint in small increments until
the target temperature is reached.
The setpoint can be changed from this screen also. To change the setpoint, press the SETPOINT button. A pop-
up keypad will be displayed. Enter the desired value and press Enter. The target setpoint can be programmed
the same way by pressing the TARGET button.
Whenever the setpoint and target are different values, the system is in the ramp mode. Any time the setpoint is
changed from the HMI or web interface, the target setpoint is also changed to the same value. To activate the
ramp, the target setpoint must be changed after the setpoint.
Other components of the ramp function are the ramp rate and cooling hours. The ramp rate is the amount the
setpoint is incremented or decremented when the ramp is active. The cooling component is the number of hours
of cooling that will take place before a ramp change is made. Typical values would be .1° for the rate and 6
hours for the cooling value. With these values, the setpoint would increment or decrement towards the target .1°
every 6 hours of Cooling or Refrigeration runtime.
The ramp function can be used to either increment or decrement the setpoint.
5.8
