Nortek B64EM Series, Руководство по установке

Страница: 5 / 28

5
• Use transition fittings if the supply and/or return air
openings of the unit do not match the duct openings.
These transitions should be dimensioned in accordance
with standard practice as specified in the ASHRAE
recommendations for duct transitions.
• Flexible connectors may be used between the unit and the
ductwork to prevent transmission of vibration from the unit
to the structure. If electric heater kits are installed, heat
resistant material must be used for the flexible connector
at the supply air end of the unit.
• It is good practice to seal all connections and joints with
industrial grade sealing tape or liquid sealant. Requirements
for sealing ducts vary from region to region. Consult with
local codes for requirements specific to your area.
Unconditioned Spaces
All duct work passing through unconditioned space must
be properly insulated to minimize duct losses and prevent
condensation. Use insulation with an outer vapor barrier.
Refer to local codes for insulation material requirements.
Air Filters
B64 Series Air Handlers are not supplied with an air filter
when shipped from the factory. The installer must provide
a high velocity filter that is appropriately sized to the return
air duct opening or filter rack located in the bottom of the
unit. Accessing the filter does not require tools and can be
removed from the front of the unit by removing the filter
door. See Unit Maintenance ( page 12 ) for filter sizes and
installation information.
WARNING:
Never operate the air handler without a filter
or with doors removed. Dust and lint can build
up on internal components, resulting in loss of
efficiency, equipment damage, and possible fire.
Acoustical Duct Work
• Certain installations may require the use of acoustical
lining inside the supply duct work. Acoustical insulation
must be in accordance with the current revision of the
Sheet Metal and Air Conditioning Contractors National
Association (SMACNA) application standard for duct liners.
Duct lining must be UL classified batts or blankets with
a fire hazard classification of FHC-25/50 or less.
• Fiber duct work may be used in place of internal duct liners
if the fiber duct work is in accordance with the current
revision of the SMACNA construction standard on fibrous
glass ducts. Fibrous duct work and internal acoustical
lining must be NFPA Class 1 air ducts when tested per
UL Standard 181 for Class 1 ducts.
• Damping ducts, flexible vibration isolators, or pleated
media-style filters on the return air inlet of the air handler
may be used to reduce the transmission of equipment
noise eminating from the air handler. These treatments can
produce a quieter installation, particularly in the heated
space. However, they can increase the pressure drop in the
duct system. Care must be taken to maintain the proper
maximum pressure rise across the air handler, temperature
rise and flow rate. This may mean increasing the duct
size and/or reducing the blower speed. These treatments
must be constructed and installed in accordance with
NFPA and SMACNA construction standards. Consult
with local codes for special requirements. For best sound
performance, be sure to install all the needed gaskets and
grommets around penetrations into the air handler, such
as for electrical wiring.
AIR HANDLER INSTALLATION
B64 series air handlers are shipped ready for vertical
upflow installation and are approved for attic, basement,
alcove/closet or crawlspace installation with zero clearance
to combustibles. See Table 1, (page 4) for required
installation clearances. This appliance is approved only
for indoor use. If installing an electric heater kit, please
refer to the installation instructions supplied with the
kit for recommended duct clearances to combustibles.
• The unit must be leveled at installation and attached to a
properly installed duct system.
• The surface that the air handler is mounted on must provide
sound physical support of the unit.
• The air handler must be installed so that all electrical
components are protected from water.
• If a louvered door is installed across the front of this unit,
the appliance must be mounted flush or behind front edge
of finished wall.
• Always reinstall the doors on the air handler after servicing
or cleaning/changing the filters.
Do not operate the air
handler without all doors and covers in place.
Packaging Removal
Remove the shipping carton and User’s Manual from the
equipment. When removing the crate, use extra care so
tubing connections are not damaged. Do not pull on the
coils upper tubes.
Mounting Applications
Vertical only air handlers are factory ready for upflow
applications. These units may be applied in downflow
applications when applied with the appropriate field kit.
Factory ready horizontal air handlers may be applied in
upflow or horizontal-left and -right discharge applications.
These units may also be applied in downflow discharge
when applied with the appropriate field kit as specified in
the units Technical Specifications.
Through-the-floor installations require a 1/4” thick
noncombustible resilient gasket to be used whenever the
supply or return air ducts pass through the floor. The gasket
should be positioned between the duct, unit, and floor.
Upflow Installations
All air handlers are factory shipped, ready for upflow
installation. The horizontal drain pan may be removed
from the air handler when installing the unit in an upflow
configuration. All return air must enter from the bottom of the
unit. A typical upflow unit is shown in Figure 1 (page 6) .
Downflow Installations
The downflow accessory kit (See Technical Specifications)
is required for downflow applications. Instructions for
installing the downflow accessory kit are included with the
kit. It is recommended that the accessory be installed prior
to installing the unit. All return air in downflow applications
must enter through the top of the unit. A typical installation
of the unit in a downflow application is shown in Figure 2
(page 6) .
Horizontal Installations
The B64 Series air handler can be installed horizontally in
an attic, basement, crawl space or alcove. It can also be
suspended from a ceiling in a basement or utility room in
either a right to left airflow or left to right airflow as shown
in Figure 3 (page 6) . Air handlers may or may not be
shipped from the factory with all the parts required for
horizontal left applications and horizontal right applications.
If your unit does not have parts for a horizontal application,
a kit may be available.