Converting Horizontal Discharge Units To Downflow (Vertical) Discharge Units - Carrier 48DU Installation Instructions Manual

RIGGING
MODEL
CABINET
WEIGHT
48DU- -024 420
Small
48DU- -030 427
48DU- -036 515
48DU- -042 537
Large
48DU- -048 543
48DU- -060 594
IMPORTANT: Use flexible connectors between ductwork and
unit to prevent transmission of vibration. Use suitable gaskets to
ensure weather tight and airtight seal. When electric heat is installed,
use fireproof canvas (or similar heat resistant material) connector
between ductwork and unit discharge connection. If flexible duct is
used, insert a sheet metal sleeve inside duct. Heat resistant duct
connector (or sheet metal sleeve) must extend 24- -in. from electric
heater element.
3. Size ductwork for max possible air flow (See Table 1).
4. Seal, insulate, and weatherproof all external ductwork. Seal,
insulate and cover with a vapor barrier all ductwork passing
through conditioned spaces. Follow latest Sheet Metal and
Air Conditioning Contractors National Association
(SMACNA) and Air Conditioning Contractors Association
(ACCA) minimum installation standards for residential
heating and air conditioning systems.
5. Secure all ducts to building structure. Flash, weatherproof,
and vibration- -isolate duct openings in wall or roof
according to good construction practices.
A
DETAIL
A B C D
90 90 83 155
92 92 85 158
106 119 97 193
118 84 144 192
120 90 144 189
130 95 159 210
Fig. 7 - - Suggested Rigging
CONVERTING HORIZONTAL DISCHARGE UNITS TO
DOWNFLOW (VERTICAL) DISCHARGE UNITS
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before installing or servicing system, always turn off main
power to system. There may be more than one disconnect
switch. Turn off accessory heater power switch if applicable.
1. Open all electrical disconnects and install lockout tag before
starting any service work.
2. Remove side duct covers to access bottom return and supply
knockouts.
NOTE: These panels are held in place with tabs similar to an
electrical knockout.
3. Use a screwdriver and hammer to remove the panels in the
bottom of the composite unit base.
4. Ensure the side duct covers are in place to block off the
horizontal air openings (See Fig. 8).
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