Marvair MAA/MGA Wall Mount AC Installation & Operation Manual
05/2023 Rev.21
37
Additional Items Needed:
Additional hardware and miscellaneous supplies (not furnished by Marvair
®
) are needed for installation.
For example, the list below contains approximate quantities of items typically needed for mounting
a unit on a wood frame wall structure. Concrete or fiberglass structures have different requirements.
(10)
3/8" carriage head mounting bolts
for unit mounting flanges. The length needed is typically
the wall thickness plus one inch.
(20)
3/8" washers
(10)
3/8" hex nuts
(6)
3/8" x 2-1/2" lag screws
for bottom bracket
•
Silicone Sealer
to seal around cracks and openings
•
Minimum 5 conductor low voltage multicolored wire cable
(i.e. thermostat wire)
•
Appropriate electrical supplies
such as
conduit, electrical boxes, fittings,
wire connectors,
etc.
•
High voltage wire
, sized to handle the MCA (minimum circuit ampacity) listed on the data
plate.
•
Over-Current Protection Device
sized in accordance with the MFS (maximum fuse size) listed
on the unit data plate.
WARNING - FIRE HAZARD
Improper adjustment, alteration, service, maintenance or installation could cause serious
injury, death and/or property damage.
Installation or repairs made by unqualified persons could result in hazards to you and
others. Installation MUST conform with local codes or, in the absence of local codes, with
codes of all governmental authorities have jurisdiction.
The information contained in this manual is intended for use by a qualified service
agency that is experienced in such work, is familiar with all precautions and safety
procedures required in such work, and is equipped with the proper tools and test
instruments.
3.4 Porting and Duct Work
General Information
Note: The following instructions are for general guidance only. Due to the wide variety of installation
possibilities, specific instructions will not be given. When in doubt, follow standard and accepted
installation practices, or contact Technical Support for additional assistance.
Wall Openings (All MAA/MGA air conditioners)
Measure the dimensions of the supply and return ports on the unit.
Cut the openings in the exterior wall for the supply and return.
IMPORTANT:
All units with electric
heat must have 1" (25.4mm) clearance on all four sides of the supply outlet duct flange on the
unit. The 1" (25.4mm) clearance must extend on all sides of the supply duct for the first 3 feet (1
meter) from the unit.
IMPORTANT: Marvair
®
requires a minimum of 1" (25.4mm)
from the surface of any supply ducts
to combustible material for the first 3 feet (1 meter) of the duct.
For all air conditioners with electric heat, the wall sleeve
MUST
have 1” (25.4 mm) clearance around
all four sides of the opening. Attach the perimeter flange of the wall sleeve to the framed opening with
appropriately sized screws. Since electric heat can be added after the unit has been installed, Marvair
recommends that all installations have the 1” (25.4 mm) clearance around the wall sleeve.
When installing the wall sleeve, the supply opening must be on top. The supply opening is smaller than
the return air opening.
