4. Install 2 laand-lbrmed flanges onto return air opening in boles
provided to li)rm a rectangle around the return air opening.
5. Install remaining 2 hand-lkmned flanges around discharge air
opening in holes provided.
6. Ductwork can now be attached to flanges.
When designing and installing ductwork, consider the lbllowing:
When connecting ductwork to units, do not drill deeper than
3/4 inch 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 ol' the unit. Recommended sizes lot filters are
shown in Table I.
Avoid abrupt duct size increases and reductions. Abrupt change
in duct size adversely al'li:cts air performance.
IMPORTANT: Use flexible connectors between ductwork and
unit to prevent transmission of vibration. Use suitable gaskets to
ensure weathertight and airtight seal.
Size ductwork lot cooling air quantity (clan). The minimum air
quantity lbr proper electric beater operation is listed in Table 2.
Heater limit switches may trip at air quantities below those
recommel'ided.
Insulate and weatherprool' all external ductwork. Insulate and
cover with a vapor barrier all ductwork passing through
conditioned spaces. Follow latest Sheet Metal and Air Condi-
tioning Contractors National Association (SMACNA) and Air
Conditioning Contractors Association (ACCA) mininmm in-
stallation standards lk}r residential beating and air conditioning
systenls.
Secure all ducts to building structure. Flash, weatherproof, and
vibration-isolate duct openings in wall or roof according to
good construction practices.
Figure 8 shows a typical duct system with 50ZP unit installed.
HAND FORM
STRAIGHT PIECE
C00006
Fig. 6--Flanges Installed on 50ZP060 Units
CONVERTING HORIZONTAL DISCHARGE UNITS TO
DOWNFLOW (VERTICAL) DISCHARGE
Belore perlbrming service or maintenance operations on
systeln, turn olT main power to unit. Turn off accessory beater
power switch if applicable. Electrical shock can cause serious
injury or death.
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. 1D bole which is
located at the end of the unit. See Fig. 2-4 lot location of
condensate connection.
FIVE PIECES OF DUCT
FLANGE ATTACHED
HERE FOR SHIPMENT
COOOO5
Fig. 5--Shipping Location of Duct Flanges
(Size 060 Only)
C00007
Fig. 7--Area Not to Be Drilled More Than 3/4-in.
Condensate water can be drained directly onto the roof in rooftop
installations (where permitted) or onto a gravel apron in ground-
level installations. Install a Held-supplied condensate trap at end of
condensate connection to ensure proper drainage. Make sure that
the outlet of the trap is at least 1 in. lower than the drain-pan
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