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Step 4 — Install Ductwork —
signed for use either with or without ductwork or rain louvers.
If either is used, care must be taken to eliminate air recircula-
tion. Recirculation can be minimized by discharging through
an extension elbow. When properly designed, single deflection
discharge louvers can be applied to ductwork and to the unit air
discharge. Fixed rain louvers over discharge outlets can cause
excessive recirculation and nuisance high-pressure switch cut-
outs. Obstructions closer than 10 ft to the discharge air pattern
can also cause significant recirculation.
NOTE: See Fig. 9 for recommended duct sizing
The 50BYN016 and 024 units are shipped with the con-
denser flanges stored inside the condenser section. Before
attaching ductwork, mount the flanges to the condenser as
shown in Fig. 10.
CONDENSER AIR DUCT — The condenser supply and dis-
charge air duct should be as short and straight as possible. The
cross section area of the duct should never be less than the face
area of the unit openings. Ductwork should be insulated to pre-
vent moisture condensation on the unit panels during cold
weather. (See Fig. 11.)
Insulate as follows:
1. If metal ductwork is used, insulation may be applied
on the inside of the duct. This installation should be ex-
tended to cover the inside of the duct flanges. It is neces-
sary to insulate the inside of the ducts at the duct flanges
to reduce heat loss from the metal cabinet by conduction
through the duct flanges and into the cold duct. Interior
insulation allows the metal duct to approach room tem-
perature. It also prevents condensation from forming and
collecting under the insulation which will occur with
exterior duct insulation.
NOTE: Fiberglass duct board may also be used if permitted
by local codes.
2. If insulation is applied to the outside of the metal duct, the
inside must be insulated for a length of 10 in. from the
unit (including the duct flanges) or up to the flexible duct
vapor barrier on the outside, which must be tightly sealed
to prevent condensation under the insulation.
SPREADER BAR
SUPPORTS
UNDER SKID
Fig. 4 — 50BYN Unit Rigging
The 50BYN unit is de-
7
SERVICE
VALVE
Fig. 5 — 50BYN024 Unit (Service Panels Removed)
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