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035-18496-000-C-1102
16 UnitaryProductsGroup
RETURN AIR DUCT ANGLES
Return air duct angles are shipped turned in. They are
intended to be unscrewed and turned for connection of duct-
work. The return air grille accessory attaches in the same
manner as the panels.
DRAIN CONNECTIONS
All drain lines MUST be trapped and located so they will not
be exposed to freezing temperatures.
The evaporator blower has 7/8" OD steel condensate stub at
each end of a single drain pan. Both ends are closed with
plastic caps. A plastic or rubber ell can be used. (Field sup-
plied) Attach the ell to the desired end and run a full size 7/8"
drain line to the nearest drain facility. Seal the cap at the
unused end with suitable mastic.
Drain piping should be constructed as shown in 14. The 3-
inch dimension must equal or exceed the negative static
pressure developed by the supply air blowers. If it does not,
the condensate will not drain properly and may overflow the
drain pan. The trap must be at least 2-inches deep to main-
tain a water seal under all operating conditions, especially
when the blowers are starting.
REFRIGERANT MAINS
Hard drawn copper tubing should be used where no appre-
ciable amount of bending around pipes or other obstructions
is necessary. Use long radius ells wherever possible. If soft
copper is used, care should be taken to avoid sharp bends
that may cause a restriction.
Where refrigerant lines pass through a wall, pack fiberglass
insulation and a sealing material such as permagum around
the refrigerant lines to reduce vibration and to retain some
flexibility in the lines.
FIGURE 13 - SUGGESTED METHOD FOR CONNECTING DUCTWORK
24"
AIR
OUTLET
BLOWER
GASKETS
(
BY INSTALLER
)
FLANGED DUCT
CONNECTION
(FIELD
FABRICATED)
NON-FLAMMABLE
COLLAR
DUCT
TRANSITION
DUCT
FIGURE 14 - RECOMMENDED DRAIN PIPING