Hired-Hand Farm Hand Series: SC-5v2 - Manual (Page 13)

Part No. 4801-5324 Rev 9-05 Farm Hand SC-5v2 5 Stage 13 of 40
6.1.4 Stage On Temperature (P4)
The OnPoint (Max. On Point) setting is the temperature at which a stage turns on. (i.e. the
temperature at which a start signal is transmitted by the controller). The OnPoint setting of a
'cool' stage will always be greater than the target temperature. The OnPoint setting of a 'heat'
stage will always be less than the target temperature. The temperature controller will
automatically limit settings accordingly.
6.1.5 Stage Off Temperature (P5)
The OffPoint (Min. On Point) setting is the temperature at which a stage turns off.
6.2 Variable/Cool Timer
The following parameters are used to program only the variable stages on the Farm Hand SC-5v2.
The following sections explain each parameter in detail.
P10 = Min. Runtime Percentage
P11 = Motor Curve Selection
6.2.1 Minimum Runtime Percentage (P10) (Variable Stages Only)
This setting is the percentage of the system timer that the variable stage will run at minimum
speed if the stage sensor's temperature is below the Minimum OnPoint (OFF) for the stage.
6.2.2 Motor Curve Selection (P11) (Variable Stages Only)
The controller is programmed to operate single phase or three phase fan motors at their optimum
performance levels. Select the correct motor curve parameter (P11) for your particular application
from the following table.
6.3 Natural Ventilation
This controller runs 1 or 2 curtain machines independently. No additional resources – including
external timers – are necessary. The curtain machines run off a common cycle timer and run
timer, however they can use separate sensors. The sensor selection is made via a switch located
on the inside of the front cover of the machine. This switch causes the machines to either operate
together or independently. If they are operating independently, unit 1 always uses sensor 1 and
unit 2 uses sensor 2.
A brief overview of the programmable parameters for the curtain machines follows:
NOTE: Parameters P20-P24 are only used when using the main curtain to
naturally ventilate the building.
P20 – Curtain Cycle Time (min.)
The controller looks at all parameters and decides whether or not to move the
curtains occasionally. This parameter determines how often this occurs. Valid
settings are 1 to 10 minutes.
Curve Conditions
0 This curve is optimized for use with Hired Hand’s line of Funnel Flow Fans that are 24” or less. Also,
line voltage must be Single Phase.
1 This curve lends itself better to operation of 36” fans. The power distributed at each percentage is
somewhat greater than that of curve 0. Therefore, the speed will be a little greater than that of curve 0.
2 This curve is for 3-Phase systems. Its purpose is to shift the voltage curve to give a much higher power
from the varied phase. Conditions that would warrant the use of this curve is a variable speed fan that
varies a great deal from 100% speed to 95% speed.
3 This curve is for 3-Phase systems. Its purpose is to shift the voltage curve to give much less power from
the varied phase. Conditions that would warrant the use of this curve is a variable speed fan that varies
very little from 100% speed to 5% speed.
4 This curve is for use with Hired-Hand’s newest Emerson fan motor. These motors are typically used on
fans that are 24” or smaller.