Friedrich HEAT PUMPS - Manual (Page 11)

11
920-087-04
If the wall is thicker than allowed in the notes in Figure 6, a sheet
met al wall sleeve ex ten sion and fl ashing MUST be used.
Installation Instructions for the PXWE – 4" Wall
Sleeve Extension
The following points MUST be considered when installing a wall
sleeve extension:
1 Provision must be made to direct excess condensate from
the back of the wall sleeve into the extension then outside
the building or to a drainage system.
2. Air baffl es must be mounted to properly direct air fl ow to
and from the condenser.
3. The wall sleeve extension design must allow for the prop er
mount ing of the grille.
4. Caulking is required at all sites where condensate or
ex ter nal water could potentially infi ltrate into the building.
5. Fabricate and install metal fl ashing in wall to serve as a drip
panel. Refer to drawing for more information.
6. Condensate notches and overfl ow slots must be kept clear
of sealant and gaskets so con den sate can fl ow freely into
the wall sleeve extension.
NOTE: Improper fabrication or installation of a wall sleeve
extension will impair PTAC performance.
Extension Installation
Secure the wall sleeve extension to the wall sleeve before
installing it in the wall. Refer to Figure 8 for a guide for fabrication
of a condensate drip panel. The panel MUST extend the full depth
of the wall sleeve and the wall sleeve extension.
Pay particular care in seal ing and caulking the panel where it
makes contact with the wall sleeve (see Figure 8). After installation
in the wall, secure with fasteners through the sides. Use a good
grade of silicone sealant around the sleeve extension. Seal all
exposed screw heads. When the installation is complete, the
outside grille should be attached to the wall sleeve extension.
Section II — Deep Wall Installation (PXWE)
Figure 8
IMPORTANT NOTE: The silicone bead MUST extend 3"
up the side of the two fl anges to pre vent condensate
from leaking.
Wall Sleeve Extension, 42" X 16" Frame, 20 gauge min i mum, painted or alu min i um
Outside Edge
Insulation
Wall Sleeve
Air Baffl es
Condensate
Notches (4)
Condensate
Drip Panel
(Field
Supplied)
Sealant inside (4) bottom corners
Drip
Edge
Width of Wall
PXWE Wall Sleeve
Extension
Wall Sleeve Extension Sealant Locations