Chore-Tronics® 2 Control Control Operation Overview
MT1843B
59
Natural to Tunnel
The Natural to Tunnel transition occurs when the Natural Mode Sensor reaches
the temperature in screen 3 for Tunnel to be “on”. The Main Curtain(s) are given
a continuous close signal as the Tunnel Curtain is given an open signal that lasts
enough time to reach the half open position if the Tunnel Curtain is set up to
control static pressure, or else continuously open if the Tunnel Curtain is not set
up to control static pressure. While the Main Curtains are going closed and they
reach the desired first opening position , the Tunnel Fans turn on that are called
for to be on. The Main Curtains are given a continuous close signal as the Control
continues in the Tunnel Mode.
Tunnel to Natural
The Tunnel to Natural transition occurs when the Tunnel Mode Sensor drops to
the temperature in screen 3 for tunnel to be “off”. The Tunnel Fans that are
running turn off and the Main Curtains are given continuous open signals for the
amount of time required to completely open the Main Curtains. At that point, the
Control proceeds with the normal Natural Mode operation, opening and closing
the Main and Tunnel Curtains depending on how far each Curtain’s assigned
Sensor(s) are from the Main Curtain Range.
Tunnel to Power
The Tunnel to Power Mode transition occurs when the Tunnel Mode Sensor
drops to the temperature in screen 3 for Tunnel to be “off” and Natural Mode is
either “not allowed” in screen 3 or not even a part of the installation in screen 12.
The Fans that are called for to be on due to being in the Power Mode turn on
immediately as the Fans that have been on because of Tunnel Mode turn off.
Similar to the Power to Tunnel transition, several or even all of the Fans that were
on in Tunnel, just prior to the transition, may stay on after the full transition to
Power depending on the way the Control is set up. The Side-wall Air Inlets are
given a full open signal during the transition. The Sidewall Inlets begin to control
static pressure once the transition is completed.
Minimum # of Tunnel Fans On
In screen 12 the “Minimum number of Tunnel Fans on” is set up. This puts a limit
on the temperature rise from one end of the house to the other while in Tunnel
Mode. As the animals grow this "Minimum number of Fans" value should
normally be increased. This parameter has no effect on how many Fans are on in
the Power Mode just prior to the transition to Tunnel. The temperature settings
set up in screen 3 determine the number of Fans that operate while still in the
Power Mode before making the transition from Power to Tunnel.
The actual “TUN FAN” outputs that make up this min. group of Fans are those
"Tun Fans" that have the lowest temp. settings in screen 3. If more than one
“TUN FAN” output is set at the same temperature in screen 3, the Control will
arbitrarily pick enough of those TUN FANS to add up to the minimum #
specified in screen 12.
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