Hired-Hand Farm Hand Series: Vent Master 24 - Manual (Page 7)

Part No. 4801-5124 rev 10-03 Farm Hand Vent Master 24 5
P32 = High Temperature Target Pressure 0.03" w.c.
P34 = Low Temperature Limit 40°F
P35 = Low Temperature Target Pressure 0.11" w.c.
As you can see from the graph, if outside temperature is 50°F, the controller will try to maintain a
static pressure between 0.08, and 0.1” w.c. If the pressure goes above 0.1” w.c. the vent machine will
open, and reduce static pressure, and if the pressure goes below 0.08” w.c., the vent machine will
close, increasing the static pressure.
8. Day to Day Operating Instructions
This section of the manual will give you all you need to know about the day to day operation of your
controller.
8.1 Checking/Adjusting Temperatures, and Timer Percentages
When no one has pressed a button for over one minute, the display will automatically show
the room temperature and the display indicator will indicate “Temperature”. To see the Static
Pressure, press the button labeled “Mode”. This button is located in the center of the
controller facepad. When this button is pressed, watch the green LED’s beside the main
display. Whenever a single LED is lit, this is the parameter you are viewing.
For viewing Target Temperature both the LEDs beside “Target” and “Temperature” will be
lit. For viewing Target Static Pressure both the LEDs beside “Target” and “Static Pressure”
will be lit.
Room Temperature
The temperature read by the sensor(s) chosen in the Program Mode under the
parameter PSd. Refer to Section 9.1 for an explanation of the PSd parameter.
Static Pressure
The static pressure sensed by the controller. While displaying the Static Pressure,
the controller will also display the temperatures read by sensors 1, 2, 3 and 4 in the
corresponding stage displays. The remaining stage displays will be blank at this
time.
Timer Percentage
The Timer percentage parameter can be used to set runtime percentage. Runtime
percentage refers to the percentage of the timer cycle that a stage on a timer will run.
Temperature
displays Room
Temperature
Stage Bank
Indicator LEDs
Displays reading of Sensor
1
Displays reading of Sensor
2
Displays reading of Sensor
3