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CONDENSER AIRFLOW LOUVERS — The proximity of
the condenser air inlet and discharge airstreams makes the pos-
sibility of air recirculation quite high. It is possible to use one
louver to route inlet and discharge airstreams but it is not
recommended.
Separate inlet and discharge louvers are recommended (see
Fig. 9) to avoid air leakage from discharge to inlet. A baffle
may also be used on the outside of the building to direct dis-
charge away from the air inlet.
Louvers should be selected with sufficiently strong blades
for the application. Louver blades should be at least 30-in. wide
and constructed of a minimum of 18-gage metal.
EVAPORATOR DUCTWORK — Supply duct should be
properly supported and the aspect ratio as close to square as
possible. Duct should be sized for a maximum of 2000 feet per
minute velocity in areas outside the equipment room. The duct
should be lined with acoustical insulation for a minimum of
10 ft beyond the equipment room. A flexible duct connection
should be used on the connection to the unit to prevent trans-
mission of any unit vibrations into the duct.
Return duct may be attached to the unit, but is not necessary.
The return to the unit should prevent line of sight visibility to
the space. Insulated return duct is also recommended for acous-
tically sensitive spaces. Maximum velocity should not exceed
1000 ft per minute over occupied spaces. Adequate return area
is essential for proper operation.
DUCT FLANGE
Fig. 10 — Placement of Duct Flanges (50BY016,024)
Step 5 — Install Rain/Condensate Drain Line
IMPORTANT: A rain drain connection MUST BE
USED if any possibility exists of rain water entering
the unit.
The 50BYN unit has a drain connection for evaporator
condensate and a connection on the unit base to drain any rain
water that may accumulate. Rain drain connection can be made
on either side of the unit. Block whichever drain is not being
used, but DO NOT BLOCK BOTH drain locations.When con-
necting rain drains and condensate drains from the unit to floor
drains, sinks, or hoppers, connect drains downstream of trap to
ensure that condensate does not drain back into the unit.
A drain kit is provided (shipped in the fan section). This
kit consists of PVC drain fittings to adapt to field-supplied
threaded pipe. Make connections through the unit side panel.
Some applications may require connection to either galvanized
steel or copper drain pipe; consult local code requirements for
details.
IMPORTANT: NEVER use pipe smaller than
in the drain run.
Pitch drain pipe downward at a slope of at least
for proper drainage. Provide tees plugged on one side for
cleanouts. Leave clearance for servicing, and observe all local
sanitary codes.
The condensate trap should have a depth adequate to allow
3-in. of water in the trap (see Fig. 12) with the unit running.
11
3
/
inches
4
1
/
-in. per ft
4
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