Indoor Return Air Grille and Ductwork
Installation
AVLWP01A-R
& AVLWP01A-L
Return Air Grille with
Access Panel
A field-supplied (25” x 20”) filter can be
mounted inside the hinged access door. The door can
be installed with the grille oriented at the top of the panel
for improved sound attenuation (Recommended for
AVH09 & AVH12)
Option 1
Field Supplied Return Air Grille
A field supplied return air grille divorced from the acces
panel must have a minimum 250 square inches of free area.
Option 2
NOTE: All VTAC chassis are shipped with a filter
installed
(20" x 14" for AVH09, AVH12, & AVH18. 20" x
18" for AVH24)
. If a different filter holder or location is
to be used, the filter on the chassis MUST be removed.
Ductwork
The supply duct system should be designed using a
recognized method such as the equal fraction or velocity
reduction method, using the appropriate duct calculator(s)
for the type(s) of duct being used in the system. The duct
system should be designed for a maximum friction rate
of .3” water column taking into consideration all fittings,
registers and/or diffusers.
NOTE: Do not operate the unit without a supply duct
attached. The return air to the VTAC unit MUST NOT
be ducted and all units must have a free return air
configuration to perform properly.
Chassis Installation
CAUTION
EXCESSIVE WEIGHT HAZARD
USE TWO OR MORE PEOPLE WHEN
INSTALLING YOUR AIR CONDITIONER.
FAILURE TO DO SO CAN RESULT IN BACK OR
OTHER INJURY.
CAUTION
CUT / SEVER HAZARD
SOME EDGES MAY BE SHARP, USE GLOVES
OR OTHER HAND PROTECTION WHEN
HANDLING UNIT.
FAILURE TO DO SO CAN RESULT IN MINOR TO
MODERATE PERSONAL INJURY.
1. Ensure that the wall adapter and louver are installed
in accordance with the instructions listed on pages
5-7.
2. Place the chassis into the closet with the outdoor
side facing the wall adapter opening.
3. Slide the chassis into the wall adapter until the
adapter divider seal is established.
NOTE: The VTAC chassis must be inserted into the
wall adapter so that the adapter divider gasket makes
contact with the plastic condenser baffle on the unit.
The chassis will fit approximately 2 3/8” into the wall
adapter.
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