WaterFurnace Envision NHAC026, Installation Manual

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ENVISION AIR COILS INSTALLATION MANUAL
General Installation Information
The Envision series encased and uncased coils are designed
for upflow, horizontal, and bottomflow applications. The
coils have a dry nitrogen holding charge and are equipped
with brazing stub refrigerant connections for easy
installation. Both models come equipped with a factory
installed TXV.
The installer should read the installation manual supplied
with the compressor section for refrigerant line set sizing,
connection procedure, and other important information
pertaining to the system installation.
The installer should:
1. Make sure that the air delivery of the furnace is adequate
enough to handle the recommended CFM and allow for
pressure drop across the air coil, filter, and duct work.
2. Where precise forming of refrigerant lines is required, a
copper tubing bender is recommended for small
diameter tubing. One should avoid sharp bends and
contact of the refrigerant lines with metal surfaces.
3. Refrigerant lines should be protected where they pass
through the raw edges of holes.
4. Coil suction line must be insulated, as well as the field
constructed plenum used to enclose the uncased coil.
Encased coils are manufactured with insulated cabinets.
5. Coil must be level for proper condensate drainage.
6. Seal the openings into the cabinet to reduce risk of
condensate blow off from the coil.
NOTE: The installation of optional heating and cooling
equipment must be properly sized and installed in
accordance with the furnace manufacture’s specifications
and recommendations . In some cases “heating only”
furnace air circulators may have to be replaced with
multispeed blowers to upgrade the air delivery (CFM)
when an add-on coil is installed . Refer to the Encased and
Uncased Coil Specification table for recommended CFM
across the coil and filters .
Model NRAC026 NRAC036 NRAC048 NRAC060 NHAC060
BTUH 26,000 36,000 48,000 60,000 60,000
CFM 925 1,225 1,625 1,760 1,760*
Encased and Uncased Coil Specifications
Coil Installation for Encased Models
WARNING: Electric furnaces may be connected to
more than one supply circuit .
The installer should:
1. Disconnect all electrical power to the furnace.
2. For the install of an encased coil, it might be necessary
to fabricate a plate to adapt the coil’s cabinet to the
furnace or air handler air discharge opening.
3. Install the cabinet and level it as needed to allow proper
condensate drainage.
4. Seal the enclosure as required minimizing air leakage.
5. Connect the refrigerant lines as outlined in the
Refrigerant Lines section.
Coil Installation for Uncased Models
WARNING: Electric furnaces may be connected to
more than one supply circuit .
The installer should:
1. Disconnect all electrical power to the furnace.
2. For the install of an uncased coil, it might be necessary
to fabricate a plate to adapt the coil’s cabinet to the
furnace or air handler air discharge opening.
3. Install the coil and level it as needed to allow proper
condensate drainage.
4. Make a plenum to enclose the coil or drop the duct
directly over the coil.
5. Seal the enclosure as required minimizing air leakage to
reduce risk of condensate blow off from the coils.
6. Insulate the entire plenum assembly as needed.
7. Connect the refrigerant lines as outlined in the
Refrigerant Lines section.
* NHAC060 CFM is dependent on desired capacity (see Hydronic Coil Performance tables in SP1603)