Bottom View - Lennox VRF V22B Series Installation Instruction

Supply Air Configurations
Supply air is typically provided from all four sides of the
cassette unit. See Figure 18.
If needed for the application, one or two sides of the
cassette supply air can be blanked off to prevent air flow
from that side. See Figures 16 and 17 for possible air flow
configurations.
Use field-provided blocking and sealing materials.
Materials must be listed ANSI/UL and ASTM E 84
approved.
NOTE - A maximum of two sides can be blanked off.
1. Remove the decorative cover panel if installed.
NOTE - Duct knockouts are located on two sides of the
V22B cassette body. If the knock out is used, the supply air
opening of the same side should be blocked and sealed.
1. Identify and measure the supply air opening that will
be blanked off. See Figure 18.
2. Seal the supply air outlet on the side to which the duct
will be attached. See Figure 17, Bottom View.
3. Prepare the blocking material. Cut a piece of styrofoam
or other non-conductive material to fit the supply air
opening.
Duct
Knockout
Supply Air
Opening
CANNOT be
blocked (no
knockout)
Supply Air Opening
Should be blocked and sealed
when the knockout is used.
Typical cassette body shown, actual unit may vary in size and location of supply air openings.
Supply Air Opening
Should be blocked and sealed
when the knockout is used.
Duct
Knockout

Bottom View

Figure 17. Typical Supply Air Configuration
4. Insert the blocking material into the supply air opening.
5. Prepare the sealing material. Cut a piece of tape or
other non-conductive sealing material to cover and
secure the blocking material.
6. Seal the supply air opening using the sealing material.
7. Knockout the secondary supply duct opening. See
Figure 17, Side View.
8. Remove any insulation.
9. Connect the secondary supply duct to the cassette
body using the eight screw holes shown in Figure 17,
Side View.
10. A field-supplied duct transition may be required. Be
sure there is an air-tight seal between the transition
and the cassette body and between the transition and
the secondary supply duct.
11. The secondary supply duct must be 4 or 6 inches
in diameter and 10 feet or less in length (including
transitions). Figure 19
NOTE - A field-supplied volume control damper can be
used to control the amount of air supplied to the space,
however, the area being conditioned by the secondary
supply duct will not have control over the temperature of
the air being supplied.
Supply Air
Opening
CANNOT be
blocked (no
knockout)
Electrical
Control Box
15
Duct
Screw
Holes (6)
Duct
Knockout
Side View