Hired-Hand Emergency Back-Up and Alarms: Farm Hand Back Up System - Manual (Page 8)

4801-5048 Farm Hand Back Up 7
5.3 Normal Mode Parameters
Room Temperature
The average of the sensors located inside the house if one room operation is
selected, or the temperatures of sensors 1 and 2 alternately displayed in the main
display if two room operation is selected.
High Limit
The temperature inside the house at which the controller will turn on the first
back up cooling stage.
Low Limit
The temperature inside the house at which the controller will turn on the first
back up heating stage.
5. Set Limits
The Farm Hand Back Up System requires setting of a High Limit and a Low Limit at which
cool/heat stages will turn on. To determine where to set the High Limit and the Low Limit, first
decide on a target temperature of the house. This is usually the target temperature of the primary
controller. Then set the High Limit to a temperature several degrees above the desired target
temperature. Set the Low Limit to a temperature several degrees below the desired target
temperature. Note: It is recommended that the High Limit be at least 10º above the room’s
target temperature and that the Low Limit be 10º below the room’s target temperature.
6.1 Set High Limit
To set High Limit:
1. Press the “Mode” button to select the High Limit Indicator.
2. Press the + and – buttons to enter the value of the High Limit
3. Setting Complete
6.2 Set Low Limit
To set Low Limit:
1. Press the “Mode” button to select the Low Limit Indicator.
2. Press the + and – button to enter the value of the Low Limit.
3. Setting Complete.
7. Program Mode Parameters
Settings that are usually set up once per growout, or maybe even just for summer or winter are
referred to as program parameters and are accessed by taking the controller to program mode. For
the Farm Hand Back Up this is mainly limited to Sensor Calibration.
To get to program mode, press and hold the “Mode” button for five seconds. When the controller
has entered program mode, the main display will flash between “P41” and the value of this
parameter.
The “P41” is known as a parameter number. All the program items for the controller have a
parameter number assigned to them. The numbers are listed in the table “Program Mode
Parameters” below with a short description of each parameter.
When in program mode, you change the value of certain parameters by using the + and - buttons
as needed. When you have finished with the current setting, press the “Mode” button to move to
the next parameter. The program mode parameters for the Farm Hand Back Up are shown in Table
3.