1. Five pieces of flange are shipped on tile return-air opening of
the unit. Remove the flanges from the shipping position (See
Fig. 5). Screws are field-supplied.
2. One piece of llange is used as it is shipped (straight). Bend the
other 4 pieces at right angles.
3. Install the straight flange on tile right side of tile return-air
opening in holes provided. (See Fig. 6). Flanges should stick
out li"om unit to allow l_)r connection of ductwork.
4. Install 2 hand-lbrmed flanges onto mtum air opening in holes
provided to lbrm a rectangle around the remm air opening.
5. Install remaining 2 hand-lbmled flanges around discharge air
opening in holes provided.
6. Duetwork can now be attached to flanges.
When designing and installing ductwork, consider the lollowing:
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 of the unit. Recommended sizes lbr filters are
shown in Table 1.
Avoid abrupt duct size increases and reductions. Abrupt change
in duct size adversely al'li:cts air perlbmmnce.
IMPORTANT: Use flexible connectors between ductwork and
unit to prevent transmission of vibration. Use suitable gaskets to
ensure weathertight and airtight seal. When electric heat is
installed, use lire proof canvas (or similar heat resistant material)
connector between ductwork and unit discharge connection. If
flexible duct is used, insert a sheet metal sleeve inside duct. Heat
resistant duct connector (or sheet metal sleeve) must ectend 24 in.
li"om the unit discharge connection flange into the ductwork.
Size ductwork lbr cooling air quantity (cfln). The minimum air
quantity lbr proper electric heater operation is listed in Table 2.
Heater lindt switches may trip at air quantities below those
recommended.
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 Condi-
tioning Contractors National Association (SMACNA) and Air
Conditioning Contractors Association (ACCA) mininmm in-
stallation standards lbr residential heating and air conditioning
systems.
Secure all ducts to building structure. Flash, weatherproof, and
vibration-isolate duct openings in wall or ronf according to
good construction practices.
Fig. 8 shows a typical duct system with 5(tZH unit installed.
CONVERTING HORIZONTAL DISCHARGE UNITS TO
DOWNFLOW (VERTICAL) DISCHARGE
t • =
Belbre perlorming service or maintenance operations on
system, turn off main power to unit and install lockout tag.
Turn off accessory heater power switch if applicable. Elec-
trical shock can cause serious injury or death.
Units are dedicated side supply products. They are not convertible
to verlical air supply. A field-supplied plenum nmst 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.
FIVE PIECES OF DUCT
FLANGE ATTACHED
HERE FOR SHIPMENT
COOOO5
Fig. 5--Shipping Location of Duct Flanges
(Size 060 Only)
HAND FORM
STRAIGHT PIECE
C00006
Fig. 6--Flanges Installed on 50ZH060 Units
Unit removes condensate through a 1 3/64-in. 1D hole (using
314-in. OD piping or tubing) which is located at the end of the unit.
See Fig. 2-4 lbr location of condensate connection.
Condensate water can be drained directly onto the roof in rool_op
installations (where permitted) or onto a gravel apron in ground-
level installations. Install a field-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
condensate connection to prevent the pan li"om overflowing. Prime
the trap with water. When using a gravel apron, make sure it slopes
away from the unit.
If the installation requires draining the condensate water away
from the unit, install a 2-in. trap using a 314-in. OD robing or pipe.
(See Fig. 9 and lit.) Make sure that the outlet of the trap is at least
1 in. lower than the unit drain-pan condensate connection to
prevent the pan li"om overflowing. Prime the trap with water.
Connect a drain tube using a minimum of 314-in. PVC, 314-in.
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