Hired-Hand Farm Hand Series: Vent Master 24 - Manual (Page 11)

Part No. 4801-5124 rev 10-03 Farm Hand Vent Master 24 9
9.2.2 Stage Mode (P2)
The Farm Hand Vent Master 24 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. 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
Farm Hand Vent Master 24 to better react to the environment. Any Stage can be programmed
to be one of the following:
1 = Heat (h1)
This mode allows the equipment to operate when room temperature
is below the OnPoint for the stage.
2 = Cool Stir (c2)
This mode setting is for cool stages that stir inside sir. This stage
will not run during tunnel mode.
3 = Cool Negative (c3)
This mode setting is primarily for negative cross ventilation fans.
This stage will not run during tunnel mode.
4 = Cool Negative Tunnel (c4)
This mode setting works exactly like the Cool Negative setting
except it will run if the controller goes into tunnel mode. This stage
is sometimes referred to as a transitional stage. In other words, it
operates before it goes into tunnel and also during tunnel.
5 = Cool Tunnel (c5)
This mode setting only works when the controller is in tunnel mode.
While in the Programming Mode and Parameter P2 is shown in the display, Stages
1/12 will be displayed first. Note the red LED next the Stages 1-12 is lighted. After
stetting P2 for Stages 1/12, press the Mode button to set stages 13/24.
9.2.3 Stage Timer Settings (P3)
The Farm Hand Vent Master 24 is equipped to satisfy any of your minimum
ventilation needs for regular runtime timers, to cool timers, to progressive timers.
00 = No Timer
Select 0 for the timer setting if you do not want the stage to be on a
timer.
01 = Runtime Timers
Any one of the On/Off stages can be placed on the system timer by
placing a "1" in parameter 3 (P3) of the stage. By doing this the
stage will operate off of the system timer while the temperature is
below the stage's OnPoint. Once the temperature reaches the stage
OnPoint, the stage will come on full time.
02 = Cool Timers
On/Off Stages
Any one of the On/Off Stages can be placed on a cool timer.
By doing this the stage will operate off the system timer only while
the temperature is above the stage OffPoint (OFF). Refer to Section
12.4 "Cool Timer Stage Operation" for proper setup.