INSTALLATION AND OPERATING INSTRUCTIONS
Remove the louvre handle by
either drilling or filing the rivets, or by removing the screws,
(A). Remove the screw holding the louvre link arm to the handle
(B). Ensure that the louvre moves freely and does not bind. Adjust
if necessary. Use light oil to lubricate all moving parts.
Loosely fit the adjusting screw into the end of the cylinder. DO NOT
tighten at this stage. Assemble the cylinder to the bracket by
feeding the piston rod into the end of the cylinder, pushing firmly
into place and securing to the body by means of the threaded studs
provided. It may be necessary to cool the cylinder before fitting.
If not already fitted insert the pivot pin through the lower hole in
the arm and push on plastic catch . Fit the link arm over the
plastic catch and push the top half of the catch firmly on the ball
of the pin .
Lay the louvre control unit against the louvre frame. Push up on the
body to fully close the louvre, ensuring that the unit is flush and
square and that the louvre link arm is vertical. Mark the position
for the holes on the louvre frame.
Drill two holes 3.2mm (''/8") diameter which you have marked.
Using the screws provided, loosely screw the unit to the louvre
frame. Push upwards until the louvre is fully closed. Tighten the
After allowing the cylinder to reach the temperature at which
you require the louvre to start opening operate the louvre manually
by pulling down on the arm to remove the pressure and firmly turn
the adjusting screw in the direction of the `LO' arrow (clockwise)
until the unit begins to open the louvre without manual assistance.
Any rise in greenhouse temperature will now cause the louvre to open
wider. Further adjustment may be necessary in which case repeat the
Patents: U.K. 1562431 1592126 0017357 U.S.A. 4140017 4450687
By turning the adjusting screw in the direction of the 'LO' arrow
(clockwise) the louvre starts opening at a lower temperature. If the
adjusting screw is turned in the direction of the `HI' arrow
(anti-clockwise) the louvre will not open until a higher temperature
PLEASE NOTE ADJUSTMENT CANNOT BE MADE WITHOUT OPERATING THE UNIT
MANUALLY BY PULLING DOWN ON THE ARM TO RELIEVE THE RETURN SPRING
As the cylinder is so positioned to also allow it to sense the
effects of any chilling air from outside it will automatically react
to this and adjust the window accordingly, giving added protection
to your plants.
MANUAL OVERRIDE: If you wish to open or close the louvre
manually remove the top half of the plastic catch and carefully
remove the link arm from the pivot pin. Providing you do not move
the unit or the adjusting knob the unit will operate at your chosen
temperature when reconnected.
Do not heat to more than 50C (122F)
Do not apply excessive loads by locking or covering louvre Do not
attempt to dismantle the cylinder
Opening temperature range adjustable between 15C and 25C (59F
Provided the autovent has been correctly fitted in accordance
with these instructions it carries a one year guarantee from date of
purchase. Should it fail to operate during this period please return
either the complete unit or defective part to the address shown on