Control Operation Overview
Control Operation Overview Chore-Tronics® 3 Control
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MT2398C
Standard Mode Functionality
Power Mode
All curtain(s) are given a continuous close signal. Inlets are controlled by static pressure (if used). All
outputs that are allowed to operate in Power Mode turn on and off per screen 4 trying satisfy their sensors
assigned in Screen 13.
Natural Mode
Main Curtain Range- The Main curtain range is defined in the Outputs and Temperature screen (Screen
4) and has a default setting of + or - 1.5 degrees F of the set temperature. Once the Control has made the
full transition from Power to Natural mode (or Tunnel to Natural), each main curtain's control sensor will
either open or close the main curtain(s) to try to keep the sensor's temperature within the Main curtain
range. If the curtain's control sensor temperature goes above the range then the curtain will open. If the
curtain's control sensor temperature goes below the range then the curtain will close. The amount the
curtain moves is based upon how far the curtain's control sensor(s) is from the AVERAGE of the Main
curtain range. If the curtain's control sensor(s) goes more than 8 degrees F ABOVE the AVERAGE of the
Main curtain range, the curtains will be given a continuous open signal until the temperature returns to
within the Main curtain range. If the curtain's control sensor(s) goes more than 8 degrees F BELOW the
AVERAGE of the Main curtain range the curtains will be given a continuous close signal until the
temperature returns to within the Main curtain range or until the Control returns to Power Mode. The
control returns to power mode when the main curtain(s) reach the first opening position (see Natural to
Power Mode transition).
Time Between Curtain Movements
The Time between curtain movements is the amount of time the control will wait after an opening or
closing of the main curtain(s) before checking the temperature again and doing another open or close
movement. The default time between curtain movements is 2 minutes. The amount time between curtain
movements can be set between 1 minute and 5 minutes. The time between curtain movements is set in
Screen 14, Curtains tab.
Rate of Curtain Movement
The Rate of Curtain Movement is the amount the control will either open or close the curtain(s) during a
curtain movement. The actual amount of curtain movement is calculated by taking the Rate of curtain
movement and multiplying by the number of degrees the curtains control sensor is from the AVERAGE
of the Main Curtain Range. For example, if the Rate of curtain movement is 1.2 inches per degree F, the
AVERAGE of the Main Curtain Range is 74.0 degrees F and the curtains control sensor is reading 76.0
degrees F then the control will open the curtain 2.4 inches (1.2 x [76-74]). The default Rate of Curtain
Movement is 1.2 inches per degree F and can be set between 1 in and 4 inches per degree F. The rate of
curtain movement is set in Screen 14, curtains tab.
All Outputs that are allowed to operate in Natural Mode turn
on and off per the Outputs and Temperatures
screen (Screen 4) trying to satisfy their sensors assigned in the Setup-General screen.
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