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NSZ/NDZ INSTALLATION MANUAL
Installing and servicing heating and air conditioning
equipment can be hazardous due to system pressure and
electrical components. Only trained and qualified service
personnel should install, repair or service heating and air
conditioning equipment. Untrained personnel can perform
the basic maintenance functions of cleaning coils and
cleaning and replacing filters. All other operations should be
performed by trained service personnel. When working on
heating and air conditioning equipment, observe precautions
in the literature, tags and labels attached to the unit and
other safety precautions that may apply, such as the
following safety measures:
Follow all safety codes.
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Wear safety glasses and work gloves.
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Use a quenching cloth for brazing operations.
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Have a fire extinguisher available for all brazing operations.
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Moving and Storage
Move units in the normal “up” orientation. Units may be
moved and stored per the information on the packaging.
Do not stack more than three units in total height. Do not
attempt to move units while stacked. When the equipment
is received, all items should be carefully checked against
the bill of lading to be sure all crates and cartons have been
received. Examine units for shipping damage, removing
the units from the packaging if necessary. Units in question
should also be internally inspected. If any damage is noted,
the carrier should make the proper notation on the delivery
receipt, acknowledging the damage.
Unit Location
Locate the unit in an indoor area that allows for easy
removal of the access panels. Location should have enough
space for service personnel to perform maintenance or
repair. Provide sufficient room to make water, electrical and
refrigerant line connections. Any access panel screws that
would be difficult to remove after the unit is installed should
be removed prior to setting the unit. Care should be taken
when units are located in unconditioned spaces to prevent
damage from frozen water lines and excessive heat that
could damage electrical components.
Air Coil Location
Refer to the air handler manufacturer’s instructions for the
blower coil unit for details on installing the air handling
portion of the system.
Condensate Drain
Follow the blower coil manufacturer’s instructions.
WARNING: Before performing service or
maintenance operations on a system, turn off main
power switches to the indoor unit. If applicable,
turn off the accessory heater power switch.
Electrical shock could cause personal injury.
Safety Considerations
Duct System
All blower coil units/air coils must be installed as specified
by the manufacturer’s installation instructions; however,
the following recommendations should be considered to
minimize noise and service problems.
An air filter must always be installed upstream of the air coil
on the return air side of the air handler or furnace. If there
is limited access to the filter rack for normal maintenance, it
is suggested that a return air filter grill be installed. Be sure
that the return duct is properly installed and free of leaks
to prevent dirt and debris from bypassing the filter and
plugging the air coil.
In applications using galvanized metal ductwork, a flexible
duct connector is recommended on both the supply and
return air plenums to minimize vibration from the blower. To
maximize sound attenuation of the unit blower, the supply
and return plenums should include an internal duct liner
of 1-inch thick glass fiber or be constructed of ductboard.
Insulation is usually not installed in the supply branch ducts.
Ducts in unconditioned areas should be wrapped with a
minimum of 1-inch duct insulation. Application of the unit
to uninsulated ductwork in an unconditioned space is not
recommended as the unit’s performance will be adversely
affected. If the air handler is connected to existing ductwork,
a previous check should have been made to assure that the
duct system has the capacity to handle the air required for
the unit application. If ducting is too small, as in replacement
of heating only systems, larger ductwork should be installed.
All existing ductwork should be checked for leaks and
repairs made accordingly. The duct systems and diffusers
should be sized to handle the design airflow quietly. If air
noise or excessive airflow is a problem, the blower speed
can be changed to a lower speed to reduce airflow. This
will reduce the performance of the unit slightly in heating;
however, it will increase the temperature rise across the air
coil. Airflow must still meet minimum requirements.
Equipment Selection
The following guidelines should be used when mating an
Envision Split to an air handler/coil.
Select R-410A components only.
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Select 13 SEER or higher air handler/coil.
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Match the air handler to the air handler coil data table.
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Indoor matching adjustable TXV should be used with
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any air handler/coil. Fixed orifice or cap tube systems
should not be used.
Utilizing Existing Coil or Air Handler
It is recommended that a new R-410A air handler be
installed with an Envision Split considering the long term
benefits of reliability, warranty, etc. versus the short term
installation cost savings. However, the existing air handler
may be retained provided the following:
Coil currently is R-410A rated
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General Installation Information
