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HDG Series Air Handler INSTALLATION INSTRUCTIONS Heat Controller, Inc.
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Do not install this unit in manufactured (mobile) homes. Improper installation is more likely in
manufactured housing due to ductwork material, size, location and arrangement. Installations in
manufactured housing can cause re resulting in property damage, personal injury or death.
EXCEPTION: Manufactured housing installations are approved only with documentation by a
recognized inspection authority that veries that the installation has been made in compliance
with the instructions and all warnings have been observed.
Duct leaks can create an unbalanced system and draw pollutants such as direct, dust, fumes
and odors into the home causing property damage. Fumes and odors from toxic, volatile or
ammable chemicals, as well as automobile exhaust and carbon monoxide (CO), can be drawn
into the living space through leaking ducts and unbalanced duct systems causing personal injury
or death (see Figure 1).
• If air-moving equipment or ductwork is located in garages or off-garage storage areas, all joints,
seams, and openings in the equipment and duct must be sealed to limit the migration of toxic
fumes and odors including carbon monoxide from migrating into the living space.
• If air-moving equipment or ductwork is located in spaces containing fuel burning appliances
such as water heaters or boilers, all joints, seams and openings in the equipment and duct
must be sealed to prevent depressurization of the space and possible migration of combustion
byproducts including carbon monoxide into the living space.
When used in cooling applications, excessive sweating may occur when unit is installed in an
unconditioned space. This can result in property damage.
In compliance with recognized codes, it is recommended that an auxiliary drain pan be installed
under all evaporator coils or units containing evaporator coils that are located in any area of a
structure where damage to the building or building contents may occur as a result of an overow
of the coil drain pan or a stoppage in the primary condensate drain piping.
The rst 36 inches of supply air plenum and ductwork must be constructed of sheet metal as
required by NFPA 90B. The supply air plenum or duct must have a solid sheet metal bottom
directly under the unit with no openings, registers or exible air ducts located in it. If exible supply
air ducts are used they may be located only in the vertical walls of rectangular plenum, a minimum
of 6 inches from the solid bottom. Metal plenum of duct may be connected to the combustible oor
base, if not, it must be connected to the unit supply duct exposed to the supply air opening from the
downow unit. Exposing combustible (non-metal) material to the supply opening of a downow unit
can cause a re resulting in property damage, personal injury or death.
Exception warning to downow:
Installations on concrete oor slab with supply air plenum and ductwork completely encased
must be not less than 2 inches of concrete (See NFPA 90A).
Warning
Warning
Notice
Notice
Warning