Whendesigningandinstallingductwork,considerthe following:
UNIT DAMAGE HAZARD
Failure to follow this caution may result in damage to unit
components.
When connecting ductwork to units, do not drill deeper
than 3/4 in. (19 mm) in shaded area shown in Fig. 7 or coil
may be damaged.
• All units should have field-supplied filters installed in the
return-air side of the unit. Recommended sizes for filters are
shown in Table 1.
• Avoid abrupt duct size increases and reductions. Abrupt change
in duct size adversely affects air performance.
IMPORTANT: Use flexible connectors between ductwork and
unit to prevent transmission of vibration. Use suitable gaskets to
ensure weathertight and airtight seal. If flexible duct is used, insert
a sheet metal sleeve inside duct. Heat resistant duct connector (or
sheet metal sleeve) must extended 24-in. (610 mm) from the unit
discharge connection flange into the ductwork.
• Size ductwork for cooling air quantity (cfm).
• Insulate and weatherproof all external ductwork. Insulate and
cover with a vapor barrier all ductwork passing through
conditioned spaces. Follow latest Sheet Metal and Air
Conditioning Contractors National Association (SMACNA) and
Air Conditioning Contractors Association (ACCA) minimum
installation standards for residential heating and air conditioning
systems.
• Secure all ducts to building structure. Flash, weatherproof, and
vibration-isolate duct openings in wall or roof according to good
construction practices.
Fig. 8 shows a typical duct system with 50ZH unit installed.
HAND FORM
STRAIGHT PIECE
Fig. 6 - Flanges Installed on 50ZH060 Units
C00006
Converting Horizontal Discharge Units to Downflow
(Vertical) Discharge
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
iniury or death.
Before performing service or maintenance operations on the
system, turn off main power to unit and install lockout tag.
Units are dedicated side supply products. They are not convertible
to vertical air supply. A field-supplied plenum must be used to
convert to vertical air discharge.
Step 6 -- Provide for Condensate Disposal
NOTE: Be sure that condensate-water disposal methods comply
with local codes, restrictions, and practices.
Unit removes condensate through a 1 3/64 -in. (26.6 mm) ID hole
which is located at the end of the unit. See Fig. 2-4 for location of
condensate connection.
FWE PIECES OF DUCT
FLANGE ATTACHED
HERE FOR SHIPMENT
C00005
Fig. 5 - Shipping Location of Duct Flanges (Size 060 Only)
Fig. 7 - Area Not to Be Drilled More Than 3/4-in.
C00007
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