Hired-Hand Electro Mechanical Controls (Relay-Switches): PHOTOHELIC POWER VENT - Manual (Page 5)

Part No. 4801-1206 Photohelic Power Vent 3
6.1 Setting the Automatic/Manual modes
The Photohelic has two switches on the right side of the front cover. The upper switch
selects either the automatic or the manual mode of operation. When in the automatic
position the Photohelic gauge will operate the air inlets off of static pressure. When the
upper switch is placed in the manual position, the lower switch can be used to open or
close the inlets.
6.2 Setting the Time Delay
For models with a time delay, the
reaction time between when the
fans come on and the vents open
can be adjusted using a Delay timer.
The Delay timer is located on the
inside of the controller in the upper
left corner. To adjust this delay,
use a small screwdriver to set the
Delay timer from 3 to 60 seconds.
7. Why Use a Pressure Controller?
The Photohelic Power Vent is used to control vent inlets in agricultural enclosures. Maintaining a slight
negative pressure inside a building ensures that air flows in evenly from all openings in the building. As
static pressure increases, the speed of the incoming air increases.
It is important to set the pressure at the appropriate level to ensure maximum efficiency. Too little vacuum,
and the livestock could suffer from drafting, and temperature shock. Too much vacuum, and fan efficiency
is reduced, increasing the levels of moisture, and ammonia in the enclosure, also driving up electricity costs.
Adjust
Time
Delay
Manual Open/Close
Zero Setting
High
Pressure
Setting
Low
Pressure
Setting
Auto/Manual