Comfort-Aire FMG****F1E Series - Manual (Page 5)

5
• The ducts should be appropriately sized to the capacity
of the air handler to ensure its proper airflow rating.
• 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.
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.
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.
Filter Requirements
FMG series air handlers are supplied with a single air filter
when shipped from the factory. Accessing the filter does
not require tools and can be removed from the front of
the unit. See Unit Maintenance on page 11 for filter sizes
and installation information.
WARNING:
Never operate the furnace without a filter in
place. Dust and lint can build up on internal
components, resulting in loss of efficiency,
equipment damage, and possible fire.
AIR HANDLER INSTALLATION
The FMG Air Handler is shipped ready for vertical upflow
installation and can be mounted directly on a wall or
recessed between framing studs as shown in Figure 1
(page 6). Units are also approved for closet or alcove
installation with zero clearance to combustibles. See
Table 1 (page 3) for required installation clearances.
This
appliance is only for indoor use.
• 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. See Figure 1.
Packaging Removal
Remove the shipping crate and User’s Manual from the
equipment. Take care not to damage the tubing connections
when removing the crate.
Mounting Applications
Units have a bottom and/or front return. Units are shipped
for installation in a front return application. Front close-
off panel (if supplied) may be discarded. If installed in a
bottom return application, attach bottom access panel to
the front of the unit below the top service panel.
If the air handler is recessed in a wall, attachment to the
framing studs are through the inside of the front flange.
For hanging applications, these units are provided with
2-piece offset hanging bracket (Figure 1) attached to the
rear of the cabinet. Mounting bracket dimensions are
shown in Figure 4 (page 12).
Connecting Refrigerant Tubing
WARNING:
Factory coils are factory shipped with a
nitrogen charge. Avoid direct face exposure
or contact with valve when gas is escaping.
Always ensure adequate ventilation is present
during the depressurization process. Address
any uncertainties before proceeding. Failure
to comply with this warning could result in
equipment damage, personal injury, or death.
NITROGEN
HEALTH
FLAMMABILITY
REACTIVITY
0 Minimal Hazard 1 Slight Hazard
1
0
0