Carrier 50DP - Manual (Page 3)

Roof Mount — Check building codes for weight
distribution requirements. Unit weight is shown in
Table 1.
Alternate Unit Support Methods — Where the curb
cannot be used, support unit with sleepers using
unit curb support area. If sleepers cannot be used,
support long sides of unit with a minimum of
3 equally spaced 4-in. x 4-in. pads on each side.
Positioning — Provide clearance around and above
unit for airflow, safety and service access. (Fig. 3)
Do not install unit in an indoor location. Do
not locate unit air inlets near exhaust vents or
other sources of contaminated air.
Although unit is weatherproof, guard against
water from higher level runoff and overhangs.
Outdoor Air Intake — The unit can be equipped
with an outdoor air damper (economizer) which
mixes outdoor air with return air.
Field-Fabricated Ductwork — Secure all ducts to
building structure. Use flexible duct connectors
between unit and ducts as required. Insulate and
weatherproof all external ductwork, joints and
roof openings with flashing and mastic in accord­
ance with applicable codes.
Ducts passing thru • an unconditioned space
must be insulated and covered with a vapor barrier.
A minimum clearance is not required for any
air duct installation.
Outlet grilles must not lie directly below unit
discharge.
Unit Duct Connections — Unit is shipped for
thru'the-bottom duct connections. Ductwork
openings are shown in Fig. 2 and 3. Duct connec­
tions are shown in Fig. 4. Field-fabricated con­
centric ductwork may be connected as shown in
Fig. 5. Attach all ductwork to roof curb and roof
curb basepans.
Concentric duct details are shown in Fig. 6.
Also, refer to installation instructions shipped with
accessory roof curb.
Economizer Section — Remove filter access panel.
Check that outdoor air damper is closed and return
air damper is open.
Economizer operation and adjustment is de­
scribed in Start-Up, Economizer Operation; and
Service, Economizer Adjustment, respectively.
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Fig. 2 — Roof Curb Details — 50DP012,014,016