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You can set up the temperatures for entering and exiting tunnel mode. Tunnel mode takes over when the working
temperature reaches the tunnel entry temperature. For example, you may be running sidewall fans to keep the
building temperature below 80 degrees. But on a hot day, this might not be enough to keep the temperature below
80 degrees, so tunnel mode begins at 83 degrees to create a wind chill effect for the animals.
Temperature Control Settings Menu - continued
The controller follows these steps when tunnel mode starts:
• Cool fans stop. Only the fans designated for tunnel mode run.
• Purge and minimum ventilation times are overridden and cease to function until the building returns to
natural mode.
• All inlets and curtains, regardless of their operating mode, will begin to move to their set Tunnel Enter size.
Tunnel mode will start once all the inlets and curtains are opened to at least their Tunnel Enter size.
• If you stage the tunnel fans on at different temperatures (set each fan’s ON Temp setting), inlets will open wider
proportionally to the number of fan groups running.
The following menu items appear only when a tunnel fan is installed.
TEMPERATURE CONTROL SETTING Z1-S02
ENTER Tunnel Temperature: 83.0
EXIT Tunnel Temperature: 80.0
Input the minimum time the building must remain in tunnel mode. This prevents the ventilation system from going
out of tunnel mode too quickly. However, the controller overrides the minimum time if the working temperature
drops to the setpoint. Don’t set the minimum time too long since it is possible the temperature could fall to the EXIT
Tunnel Temperature and turn off the fans before the minimum time expires leaving you with no ventilation.
TEMPERATURE CONTROL SETTING Z1-S02
Remain in Tunnel Time: 0:05:00
You can prevent the controller from entering Tunnel mode if the outside temperature is too low. Set the Enable
Tunnel Entry, Outside Temp value to the temperature where the outside temperature has to be above to allow tunnel
mode. An Outside Temperature Sensor has to be installed for this menu to appear.
TEMPERATURE CONTROL SETTING Z1-S02
Enable Tunnel Entry, Outside Temp: 55
Refer to Appendix 1, page 163, for information on staging tunnel groups.
During Tunnel Exiting, all inlets and curtains, regardless of their operating mode, will begin to move
to their set Tunnel Exit size. Natural mode will start, and the inlets/curtains will return to their
normal operations, once all the inlets and curtains are opened to at least their Tunnel Exit size.
Tunnel Settings