Glossary of Terms Chore-Tronics® 2 Control
18
MT1843B
Spare Temp Sensor
The spare temperature sensor is a temperature sensor that is separate from one of the
12 controlling sensors. This sensor can be used to control the temperature in a
separate area of the house. The sensor has its own maximum and minimum alarm
parameters that can be set up in the Alarms screen. The sensor can also turn on and
off the Spare Temperature Sensor Output. This output functions like a fan output.
The output has lower Off temperature than its On temperature. The On and Off
temperatures for the Spare Temperature Sensor output are defined in the Outputs and
Temperatures screen. The spare temperature sensor can not be used to control any
other output.
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.
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.
Mt1701-Tunnelmode 11/01
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