1. Put the cylinder in cold water or a refrigerator until the piston fully retracts (about 30 min.)

2. Ensure that the window opens freely.

Aluminum framed greenhouses use the enclosed clamps (part no 11)– see Fig.3.
Fit one clamp loosely onto the window brackets (part no 10) of the opener using the enclosed screws – see Fig.2.
Choose the most suitable holes on the sill bracket (part no 9) of the opener, and fit the second clamp onto this - make sure that the upper edge of the sill bracket is as close as possible to the edge of the windowsill.
If the supplied clamps do not fit, read the manual supplied by the greenhouse manufacturer.

For wood greenhouses you will need some wood screws, typically 1.25".

3. Insert the cylinder into the clutch t (part no 4) and align the hole at the end of the piston rod with hole a in the clutch t – and lock it by inserting the small hairpin (part no 5) – see Fig.4.

4. Tighten the sill bracket of the opener onto the centre of the windowsill - see Fig.6

5. Tighten the window bracket onto the window frame right above the sill bracket. the window must remain closed during this operation.

6. Open the window just enough to allow the thread on the cylinder to catch the thread inside the cylinder housing (part no 3). now thread the cylinder on until the same amount of thread is visible on either side of the cylinder – see Fig.5

7. Check if the window can open freely as much as the opener allows it to, if not, reduce the opening width.
The opening width can be restricted to a width of 32 cm (approx. 12 1⁄2 inch) by inserting the big hairpin (part no 6) into hole C on the L arm. The small hairpin must always connect the piston rod with clutch t in hole B.
By assembling the piston rod and clutch t in hole B a small reduction of the opening width is gained, and the unit will start to open at a higher temperature.