Hired-Hand Farm Hand Series: Vent Master 16 Stage - Manual (Page 14)

Part No. 4801-5098 Farm Hand Vent Master 11
above the minimum OnPoint setting (OFF). Refer to Section 12.5
"Variable Speed Stage Operation" for proper setup.
9.2.4 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.
9.2.5 Motor Curve (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.
9.3 Vent Parameters
This controller runs 1 or 2 vent machines independently. No additional resources – including
external timers – are necessary. A brief overview of the programmable parameters for the vent
machines follows:
P20 – Vent Machine Time Delay
This setting is the length of time a pressure reading must be out of range before
the controller will operate the vents. This will keep the vents from constantly
cycling open, then closed. If your vents cycle too much, increase this setting
using the plus (+) button.
P21 – Static Pressure Differential
The range over which the Target Pressure will be maintained.
P22 – Tunnel Target Pressure
In tunnel mode, this is the Target Pressure that will be maintained if and only if
SWX 4 of the Tunnel Switches is ON.
P25 – Tunnel OnPoint
This is the sensor 4 temperature at which the controller will enter tunnel mode.
This is only applicable when tunneling on outside temperature.
P26 -- Tunnel OffPoint
This is the sensor 4 temperature at which the controller will exit tunnel mode.
This is only applicable when tunneling on outside temperature.
9.4 Pressure Ramping Parameters
P30 – Ramping Mode On/Off
Ramping mode may be turned on or off. If you choose “OFF”, you will not see
the following settings. However, if you choose “ON”, with the plus or minus
button, you turn ramping on, and will have to set the following items. See
Section 7 on ramping for more information on this feature.
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.