550.13-N10Y
Unitary Products Group
10
®
DUCT CONNECTIONS
All ducts should be designed and installed in accordance with
all national and/or local codes.
Ducts should be sized no smaller than the duct flanges on the
unit or the electric heater (if used). Refer to the unit dimen-
sions (Fig. 18 and 19) and heater detail (Fig. 5) for these
sizes. Refer to Form 550.13-N10.1U for installation instruc-
tions on the electric heater.
Use flexible fiber glass or plastic cloth collars or other non-
flammable material at the unit duct connections to minimize
the transmission of noise and vibration.
Insulate all ductwork running through the unconditioned
areas to prevent moisture condensation and to provide more
economical operation.
The return air duct flange is factory-mounted on the front of
the unit.
A supply air plenum (Fig. 6 and 7), a base (Fig. 8 and 9) and
a return air grille (Fig. 7) are available as field-installed acces-
sories, and one of the following respective instructions will be
packed with each.
•
Form 550.13-N10.2U - Supply Air Plenum
•
Form 550.12-N10.3U - Return Air Grille
•
Form 550.13-N10.4U - Base
The supply air plenum and the return air grille should be used
in lieu of ductwork only wen a free blow/free return applica-
tion is practical.
REFRIGERANT MAINS
Many service problems can be avoided by taking adequate
precautions to provide and internally clean and dry system
and by using procedures and materials that conform with
established standards.
Use hard drawn copper tubing where no appreciable amount
of bending around pipes or other obstructions is necessary.
Use long radius ells wherever possible with one exception -
small radius ells for any traps in a vapor riser. If soft copper is
used, care should be taken to avoid sharp bends which may
cause a restriction.
Fiber glass insulation and a sealing material such as perma-
gum should be packed around refrigerant lines where they
penetrate a wall to reduce vibration and to retain some flexi-
biltiy.
Support all refrigerant lines at minimum intervals with suitable
hangers, brackets or clamps.
FIGURE 10 : SUPPLY AIR PLENUM FEH 180
1
1.
Electric Heaters are NOT UL approved for installation
within a SUPPLY AIR PLENUM.
FIGURE 11 : SUPPLY AIR PLENUM KNOCKOUTS
KES180
FIGURE 12 : SUPPLY AIR PLENUM LES240
1
1.
Shipped knocked down for field assembly.
1 9 - 7 / 8
1
6 - 1 / 8
2 - 1 / 2
5 5 - 3 / 4
6 0 - 3 / 4
1 - 1 / 8
3 1
1 - 3 / 4
1 9 - 1 / 2
2 7
2 - 1 / 2 K N O C K O U T F O R P O W E R W I R I N G
W H E N E L E C T R I C H E A T E R I S U S E D
3
1 - 1 / 2
1 1 - 1 / 2
K N O C K O U T S F O R P O W E R & C O N T R O L W I R I N G
1 9 - 1 / 2
