Hired-Hand Farm Hand Series: Stage Master - Manual (Page 16)

Part No. 4801-0151 Rev 4-06 Farm Hand Stage Master 16 of 40
1. The first step in setting up your tunnel house is to configure the stages that you want as your
cool tunnel stages. If some stages need to operate in tunnel mode and in normal mode, then
program these stages to be cool negative tunnel stages. See the Program Reference section
in the back of this manual for more information on the operation of various stage modes.
2. The next step in setting up your tunnel house is determining how your controller should
operate while out of tunnel mode. In other words, does your house always power ventilate or
does it naturally ventilate using curtain sidewalls. If it is a power ventilated house you must
set the Power Ventilate switch (Tunnel bank SWX-3) in the on position.
3. The last step in setting up your tunnel house is determining how you would like to initiate
tunnel mode. You can initiate tunnel mode by outside temperature or by your lowest
programmed cool tunnel stage. The lowest programmed cool tunnel stage is determined by
the lowest OnPoint. If you would like to tunnel based on outside temperature you must set
the Tunnel On Stage (SWX-2) switch to off. You can then set the temperature at which you
would like to enter tunnel mode at P24 and the temperature at which you would like to exit
tunnel mode at P25. Otherwise, set the Tunnel On Stage (SWX-2) to on.
The following is a brief description of how the tunnel would work in each of the situations.
Tunneling on outside temperature in a naturally ventilated building
When the outside temperature rises above the Tunnel OnPoint (P25), the
controller will shut down all stages and begin to close the main curtain and open
the inlet curtain. After 1 minute has passed, the controller makes sure that the
inlet is open. If there is no error condition, the controller will begin waiting for
the main curtain to close. If the controller does not see the main curtain closed
after 12 more minutes, it will abort tunneling, and sound the alarm. Once the
controller recognizes that the main curtain is closed, it will then allow the other
cool tunnel and cool negative tunnel stages to come on. Once the temperature
drops below the Tunnel OffPoint (P26), the controller will open both the inlet
and the main curtain fully and return the stages to normal operation
immediately.
Tunneling on a stage in a power ventilated building
As soon as the lowest programmed Cool Tunnel stage comes on, the controller
opens the inlet curtain and leaves all Cool Negative Tunnel and Cool Tunnel
stages on. When the temperature begins to fall and the lowest programmed
Cool Tunnel stage turns off, the controller will close the inlet fully and return
the stages to normal operation immediately.
Tunneling on outside temperature in a power ventilated building
The controller reacts in the same way as in the previous example, except it uses
P25 and P26 to enter and exit tunnel. For proper operation in a house without a
curtain sidewall, you must jumper the curtain closed switches on the main
curtain together.
Note: If you are using a main sidewall curtain, it must run at a speed
where it can go from fully open to fully closed in less than 13 minutes.
If not, the controller will not operate properly as tunnel.
9.4 Cool Timer Stage Operation
On the Farm Hand Stage Master any of the ON/OFF can be placed on a cool timer. A cool timer
stage will come on and run at the timer percentage whenever temperature is above it’s OffPoint
(Off), and its timer percentage will increase as temperature rises. The following graph shows how
you can vary this percentage.
Refer to Graph 1 and Table 1. The stage is placed on a cool timer by setting P3=2. A Cool
Timer stage always varies its runtime based on the stage's temperature and it’s ON and OFF
settings. In this example, the OffPoint is set to 80ºF (OFF=80), and the OnPoint is set to 86ºF