Hired-Hand Farm Hand Series: Vent Master 24 - Manual (Page 8)

Part No. 4801-5124 rev 10-03 Farm Hand Vent Master 24 6
For example, if the Timer Pct. is set for 30, and the timer cycle is set for 10 minutes, the
timed stages will run for 3 minutes out of every 10 minutes (i.e. 30% of the timer cycle).
Runtime Percentage
The Timer Pct. parameter sets the Runtime percentage of all stages that are placed on a
timer (See Section 9.2). The value of the Timer Pct. in the main display refers to a
Runtime % which can be set to values between 5 and 100 using the "+" and "-" buttons.
Target Temperature
The target temperature is the temperature the system tries to maintain.
To adjust these settings, press the mode button until you see the setting you want to
adjust, then use the + button to raise the value, and the - button to lower the value.
When you are finished setting a new value, either press the mode button again, or do
nothing, and the system will return to normal operation within a few seconds.
Target Static Pressure
The Static Pressure the system tries to maintain within the limits of the Pressure
Differential.
To adjust the Target Static Pressure, press the mode button until you see the setting
you want to adjust, then use the + button to raise the value, and the - button to lower
the value. When you are finished setting a new value, either press the mode button
again, or do nothing, and the system will return to normal operation within a few
seconds.
The Pressure Differential is the range around the Target Pressure that is considered
satisfactory. From the Target Pressure and the Pressure Differential the target high
and low pressure limits are calculated as follows:
Target High Pressure Limit = Target Pressure + ½ Pressure Differential
Target Low Pressure Limit = Target Pressure + ½ Pressure Differential
Vent Master 24
(Parameter selection sequence)
Room
Temperature
(Stages 1/12
ON Point)
Static
Pressure
Target
Temperature
Timer
Percentage
Target
Pressure
Room
Temperature
(Stages13/24
On Point)
For Target Temperature, both
the Target LED and the
Temperature LED will be
lighted.
For Target Pressure, both the
Target LED and the Static
Pressure LED will be lighted.