The top sash must be installed first in the outside track (closest to the exterior).
CAUTION: When replacing sash, both sash pins must be positioned above the locking terminal assembly located in the vinyl jamb liner.
Hold the top sash in a horizontal position. Place one sash pin above the locking terminal assembly. Raise opposite side and place sash pin above locking terminal assembly on that side. Tilt sash up and, depressing the vinyl jamb liner, ease into place. Lower sash slightly to engage locking terminal assembly. Raise the top sash to top of frame and repeat the procedure for the bottom sash.
After the sash is installed, check the vinyl weather strip flange on the exterior side of the vinyl jamb liner to see that it is not wedged between the blindstop. (Older style vinyl jamb liners do not have the weatherstrip flange.) If it is, loosen it by sliding your finger along the blindstop.