Hired-Hand System 2001 Power Curtain Controller - Manual (Page 12)

4801-1200 System 2001 Power Curtain Controller
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7.3.2.8 Minimum Vent
Minimum vent is a feature which is useful when in negative pressure ventilation. As
each stage of fans turns on, the inlet area must get larger in proportion to allow for
maximum efficiency. Minimum vent should be set when the controller is installed.
Since minimum vent is related to inlet size and configuration, the settings should
not change unless you have added new vents, or curtains.
To find your minimum vent settings, you will need a manometer calibrated in
“inches of water column.” A manometer is a device used to read negative static
pressure.
As each stage cool stage turns on, more air will be drawn out of the house. This
increases negative static pressure, lowering efficiency. To restore the efficiency you
expect, you will need to open the inlet curtain to a point where the static pressure is
at or very near the maximum efficiency. This maximum efficiency will be
somewhere around .02”wc.
When you are ready to find your minimum vent settings, go to your building and
put curtain control in manual. Open the inlet curtain all the way. (Inlet curtain is
the curtain opposite the sidewall fans, or tunnel fans in a tunnel building.) Turn on
all fan stages. Close the curtain manually until you read .02”wc. on the manometer.
Then write down the curtain position and the last fan stage number. Turn off the
last stage then repeat the process of closing the curtain and writing down the curtain
settings for each stage. Continue until all fan stages have been recorded. Enter this
data when prompted while setting up stages.
7.3.2.9 Timed Vent
Timed vent is a feature which should be used with discretion. If your setup requires
you to open your curtain to allow for negative pressure ventilation, you may
program the distance for the curtain to open here. Every time your timer fans come
on, the curtain will open to this set amount, and then close when the fans shut off.
Once again the curtain will be doing a lot of opening and closing, and you will need
to check them much more frequently to make sure the cable does not break on a
cold night.
7.3.2.10 Cool Side Delay
Cool side delay allows you to program one side of a conventional building to follow
the other side by a set number of inches. This setup requires two curtain machines.
When this option is used, the cool side curtain (which ever side you use) will
remain closed until the warm side has opened the amount you set. Then the cool
side curtain will continue to follow at that distance. You pick the cool delay unit
from this menu.
7.3.3 Stage Controls
7.3.3.1 Calibrate Sensors
All Hired-Hand electronic controllers use resistance temperature sensors to
determine temperature. Due to the differences in voltage from one region to
another, more than likely at least one of your sensors will need calibration at one
time or another.
There are two requirements for calibrating sensors; a reliable thermometer, and a
stable building (no wild temperature swings, no fans running, no heaters running,
etc.) Press select features up arrow until “Calibrate Sensors” is shown. Use the
change setting up arrow to select yes. Check the temperature near the sensors (at the
same height as the sensors) then enter new temperature for sensor number one with