Hired-Hand Farm Hand Series: SC-5v2 - Manual (Page 21)

Part No. 4801-5324 Rev 9-05 Farm Hand SC-5v2 5 Stage 21 of 40
The graph shows how the speed of the fan will increase with the following settings:
Setting Parameter Setpoint
Sensors P1 - Stage Sensors Any Combination
Timer Setting P3 - Timer Selection 0 - Not on Timer
Maximum On Point P4 - On Point 81
°F
Minimum On Point P5 - Off Point 75
°F
From the graph, you can see that at 78
°F, the variable speed fan will run at 70% of maximum
speed. Below 75
°F the variable speed fan will run at its minimum speed, for the minimum timer
percentage (P-10). Above 81
°F the variable speed fan will run at 100% continuously.
If you want to use the cool timer option for these two stages, refer to the section “Setting up a
Cool Timer Stage”.
9.6 Setting Up a Variable Speed Fan
There are two unique Parameters used in programming a variable speed fan, in addition to the
other five stage programming parameters. They are P10-P11. The following is an overview of
how to program a variable speed fan:
1. Enter Program Mode by pressing and holding the Mode button for 5 seconds until
P1 is displayed if the red light next to the stage you want to program is not lit, press
the mode button repeatedly until that light is lit. This parameter selects the sensor(s)
that this stage watches for on/off operation.
2. Press the + or - button until the desired sensor is displayed. 1= sensor 1; 2 = sensor
2, and 3 = an average of sensors 1 and 2.
3. Press the Mode button again and P2 is shown. This parameter selects what mode the
stage operates as.
4. Press the + or - button until the desired mode is displayed.
5. Press the Mode button until P3 is displayed. This parameter allows you to put a
stage on the system timer (5 or 10 minutes).
6. Press the + or - button until a 0 is displayed.
7. Press the Mode button again and P4 is displayed. This parameter sets the OnPoint
temperature for this stage (The temperature the stage will run at full speed
continuously). Press the + or - button until the desired on temperature is displayed.
8. Press the Mode button again and P5 is displayed. This parameter sets the OffPoint
temperature for this stage (The temperature the stage will run continuously at its
minimum speed). Press the + or - button until the desired on temperature is
displayed.
Note: The speed of the fan will vary between the On Point and the Off Point.
9. Press the Mode button again. P10 is now displayed. This is where you set the
minimum runtime percentage. In other words this is the percentage of 5 or 10
minutes that you want your fan to run while the temperature is below the OffPoint of
the stage.
10. Press the Mode button again and P11 is displayed. This is the motor curve for the
fan.
11. Exit program mode by pressing the Mode button until PS3 has been displayed or by
waiting 1 minute.
12. Now press the Mode button until the green light next to Var/Timer Pct is lit and the
stage status indicator for the variable speed stage you are programming is lit. Press
the + or - button until the desired minimum fan speed (in %) is displayed.