Glossary of Terms Chore-Tronics® 3 Control
15
MT2398C
Static Pressure
Static pressure refers to the pressure difference that exists between the inside of the house and the outside
of the house. This pressure difference is the result of Fans in the walls running. The air that they exhaust
enters the house through various types of air inlet openings. In the Power Mode the typical powered baffle
inlets is where the vast majority of the air enters. In the Tunnel Mode, the tunnel inlet at the end of the
house is where the air enters. The pressure drop, due to the resistance to the air flowing through the inlets,
is the reason a static pressure difference exists. If the inlets are all the same size, the same amount of air
will enter through each inlet. In the Natural Mode of operation, the outside wind is the source of the air,
with no exhaust fans running. In general there is little or no static pressure during the Natural Mode due
to the huge area of the open side wall curtains. When the incoming air is cooler than the inside air, it will
tend to drop down onto the birds before it is warmed up. Adequate static pressure brings the air into the
house high and fast so that it heats up before it can fall.
Tunnel Mode
This mode of operation requires a group of large fans at one end of the house with a large air Inlet area at
the opposite end of the house. The control converts to this mode of operation from the Power or Natural
Mode (if used), when the temperature(s) while in those modes get too high. The typical 5 or 6 mph. breeze,
which can be created by the Tunnel Fans running, produces a wind chill effect that is significant. This
mode of operation happens during warm to hot weather.
Mt1701-Tunnelmode 11/01
Wind Delay
The static pressure has to be out of the control limits continuously for the "wind
delay" amount of time before the inlets are adjusted. If a fan or fans has turned
on or off within the last 10 seconds, the wind delay does not happen and the inlets
respond as soon as the static pressure leaves the control limits.
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