Hired-Hand Farm Hand Series: 4 Stage Controller - Manual (Page 6)

4801-5058 Rev 8-04 Farm Hand 4 Stage Controller 6 of 30
6.1 Stage Parameters
The following parameters are used to program each stage on the Farm Hand 4 Stage
Controller. Through these parameters, the user has complete control over the operation of
each stage. The following section explains each parameter in detail.
P1 = Stage Sensors
P2 = Stage Mode
P3 = Stage Timer Settings
P4 = Stage ON Point
P5 = Stage OFF Point
6.1.1 Stage Sensors (P1)
The 4 Stage Controller triggers stage operations from temperature sensors. The
stage sensor parameter (P1) sets which sensor(s) the controller uses to regulate
stage operation.
P1 options are as follows:
10 = Sensor 1
Sensor 1 is used. The controller will ignore sensor 2.
02 = Sensor 2
Sensor 2 is used. The controller will ignore sensor 1.
12 = Average of Sensors 1 & 2
The average temperature of sensor 1 and sensor 2 is used.
6.1.2 Stage Mode (P2)
The 4 Stage Controller is a very intelligent controller, therefore, it needs to not only
know whether this is a heating or cooling stage but also what type of cooling stage.
The 4 Stage Controller reacts not only to temperature but also curtain position.
This feature allows the grower to program the cooling stages to work exactly like
he wants them to without the expense of hard wiring through relays and limit
switches. This feature allows the 4 Stage Controller to better react to the
environment. Any Stage can be programmed to be one of the following:
01 = Heat
This mode allows the equipment to operate when room temperature
is below the ON Point for the stage, and the curtains are closed.
02 = Cool Stir
This mode setting allows the cool stage to run whether the main
curtain is open or closed. The only time that this mode will not run
is during tunnel mode.
03 = Cool Negative
This mode setting only allows the cooling stage to run if the main
curtain is closed, hence the name Negative. This stage will not run
if the controller is in tunnel mode.
Important: In the following descriptions, many references are made to the Main Curtain
(Unit 1). If you do not have a Main Curtain or do not wish to use the auxiliary connection
as shown in section 11.3, you must place a jumper across the signal terminals for Unit 1.
This manipulates the controller into thinking the main curtain is closed. In turn, this allows
the heat and negative stages to operate.