Outside Air Connection - Lennox VRF V22B Series Installation Instruction

Outside Air Connection

A limited amount of filtered outside air can be brought into
the cassette unit [through the 2-1/2 inch (64 mm)] outside
air knockout to be conditioned and mixed into the supply
air.
1. Remove the decorative cover panel if installed.
2. Remove the plastic outside air diverter by unscrewing
the screw shown in Figure 13.
Remove
Screw
Outside Air
Diverter
Diverter color may vary from shown.
Figure 13. Typical Outside Air Diverter
3. Make sure the outside air supply channel is clear of
styrofoam and debris. It may be necessary to cut out
or punch through a styrofoam plug. See Figures 14
and 15.
Figure 14. Typical Outside Air Supply Channel with
Styrofoam Plug Intact
Figure 15. Typical Outside Air Supply Channel with
Styrofoam Plug Removed
4. Reinstall air diverter using the screw removed in step
2. See Figure 13.
5. Knock out the outside air supply opening. See Figure
16.
Figure 16. Typical Outside Air Knockout
6. Remove any insulation.
7. Connect the outside air duct to cassette body using
the four screw holes shown in Figure 16.
8. Relocate the indoor unit's return air sensor to either
the controller (electronically) or physically by using the
remote sensor accessory.
9. The outside air supply duct length must be 10 feet or
less.
10. Use a field-supplied booster fan to increase static
pressure.
14