Hired-Hand Electro Mechanical Controls (Relay-Switches): PHOTOHELIC POWER VENT - Manual (Page 4)

Part No. 4801-1206 Photohelic Power Vent 2
Low Pressure
High Pressure Limit
Low Pressure Limit
When pressure is
in this range, the
controller will not
adjust vents.
When pressure is
above the high
limit, the vent
machine will open
vents to lower
pressure.
When pressure is
below the low
limit, the vent
machine will close
vents to raise
pressure.
High Pressure
Room Pressure
5. Installation
5.1 Tools Required
1 Drill with a flat head screwdriver attachment.
1 Small Screwdriver
1 Wire Stripper
5.2 Instructions
1. Mount Photohelic in a safe location, vertically. Location needs to have adequate ventilation.
2. Mark bracket holes with pencil and pre-drill.
3. Place controller on the wall and match holes.
4. Insert wood screws and use drill to tighten in place.
5. Connect the Power Supply (See Section 8.1).
6. Connect wiring from PowerTrak unit. (See Section 8.2).
7. Zero out the Dwyer gauge. Turn the zero setting knob until the black needle lines up with the
“0” on the gauge.
8. Run inside (low pressure) and outside (high pressure) tubing. Connect tubing on the right side
of the control box labeled Inside/Outside.
9. Inside tubing should be run inside the building containing the fans which are pulling air. Place
a dust filter over the end of the inside tubing.
10. Outside tubing should be placed outside of the controlled room, such as in the attic or
completely outside the building and not subject to a draft. Place a dust filter over the end of
the outside tube.
11. When controller is installed check the operation of the vents when in manual mode, and then
check for proper operation in automatic mode.
Caution!
Extra care should be taken when running the tubing so that it is not cut or
pinched!
6. Overview of the Photohelic Power Vent
The Photohelic Power Vent has been designed with the
producer in mind. Routine tasks such as changing the
pressure limits are easily reset, and are familiar in nature.
This controller has only two basic settings: Target High
Pressure and Target Low Pressure. The controller will open
and close the vents as needed to maintain pressure between
these limits.
Now that we know how the controller works, lets move
on to how to set up those limits.
The Photohelic gauge has two knobs on the Dwyer gauge, one for the Low limit and one for the high limit.
Turn the knob clockwise to increase the setting and counterclockwise to decrease.