Installation manual

6
ENVISION AIR HANDLER INSTALLATION MANUAL
Air Handler Sizing Selection
The Envision Air Handlers are designed for R410a refrigerant and should be matched with Envision Split series compressor
section according to the table below.
General Installation Information cont.
Moving and Storage
If the equipment is not needed for immediate installation it
should be left in its shipping carton and stored in a clean,
dry area. Units must only be stored or moved in the normal
“up” orientation.
Unit Location
Locate the unit in an indoor area that allows for easy
removal of the filter and access panels (the air handler
units are not approved for outdoor installation). Location
should have enough space for service personnel to perform
maintenance or repair. Provide sufficient room to make
refrigerant, electrical and duct connections. If the unit is
located in a confined space, such as a closet, provisions
must be made for return air to freely enter the space by
means of a louvered door, etc. The air handler section may
be installed on any level surface strong enough to support
its weight. When installed in a closet or on a stand, it
should be mounted on vibration absorbing material slightly
larger than the base to minimize vibration transmission to
the building structure.
When installed in an attic or above a drop ceiling, the
installation must conform to all local codes. If the unit
is suspended and installed in the horizontal position,
the entire length of the unit should be supported. If the
application requires the air handler to be installed on the
attic floor then the unit should be set in a full size secondary
drain pan. In this case the secondary drain pan should be
set on top of a vibration absorbing mesh. The secondary
drain pan is usually placed on a plywood base. A secondary
drain pan should be used when equipment is installed over
a finished living area to provide protection from water
damage in case of plugging of the air handler primary drain
line. The secondary drain line should terminate somewhere
that is easily visible by the homeowner. Be certain to show
the homeowner the termination location of the secondary
drain line and to explain its purpose.
Duct System
The duct system should be sized to handle the design
airflow quietly and efficiently. To maximize sound
attenuation of the unit blower, the supply and return
plenums should include an internal duct liner of fiberglass or
constructed of ductboard for the first few feet. On systems
employing a metal duct system, canvas connectors should
be used between the unit and the ductwork. If air noise
or excessive airflow is a problem, the blower speed can
be changed. Application of the unit to un-insulated metal
ductwork in an unconditioned space will cause poor unit
performance and allow condensation to form on the duct
and possibly cause damage to the structure.
If the unit is connected to existing ductwork, check the duct
system to ensure that it has the capacity to accommodate
the air required for the unit application. If the duct is too
small, as in the replacement of heating only systems, larger
ductwork should be installed. All existing ductwork should
be checked for leaks and repaired as necessary.
Air Handler
Indoor Split Model
(Single)
Indoor Split Model
(Dual Capacity)
Outdoor Split Model
(Dual Capacity)
Airfl ow(CFM) Electric Heat (kW)
NAH022B***1R
NSZ022 - 800 5
NAH026B***1R
- NDZ026 NDS026 925 5
NAH030B***1R
NSZ030 - - 980 5, 10
NAH036B***1R
NSZ036 - - 1225 5, 10
NAH036B***1R
- NDZ038 NDS038 1225 5, 10
NAH042B***1R
NSZ042 - - 1425 10, 15
NAH048B***1R
NSZ048 - - 1625 10, 15
NAH048B***1R
- NDZ049 NDS049 1625 10, 15
NAH060B***1R
NSZ060 - - 1760 10, 15, 20
NAH060B***1R
- NDZ064 NDS064 1760 10, 15, 20
NAH060B***1R
NSZ070 - - 1760 10, 15, 20
NAH060B***1R
- NDZ072 NDS072 1760 10, 15, 20
02/05/13