Technical data

3. INSTALLATION (CONT’D)

3.6 CONNECTING THE DUCTS TO THE UNIT

If ducts have to go through an unconditioned space (e.g.: attic), always use insulated ducts.

Make sure the vapor barrier on the insulated ducts does not tear during installation to avoid condensation within

the ducts.

INSULATED FLEXIBLE DUCTS

Use the following procedure for connecting the insulated flexible duct to the ports on the unit (exhaust to outside and fresh air from

outside).

 Pull back the insulation to expose the flexible duct and place it over inner port ring.

 Install good quality aluminum duct tape on flexible duct to prevent potential water leakage from duct.

 Attach the flexible duct to the port using tie wrap.

 Pull the insulation over the joint and tuck it between the inner and outer rings of the double collar.

 Pull down the vapor barrier (shaded part in illustrations below) over the outer ring to cover it completely. Fasten in place the vapor

barrier using the port strap (included in unit parts bag). To do so, insert one collar pin through vapor barrier and first strap hole,

then insert the other collar pin through vapor barrier and center strap hole and close the loop by inserting the first collar pin in the

last strap hole.

Do not use screws to connect rigid ducts to the ports.

RIGID DUCTS

To prevent potential water leakage from ducts, use good quality aluminum duct tape to connect the rigid ducts to the ports.

Make sure that both balancing dampers are left in a fully

open position before connecting the Fresh air to building

port and Exhaust air from building port (as shown in

illustration at right).

VJ0091

12345

VJ0088

COLLAR PIN

CAUTION