Carrier 48MA/50ME016-040 specifications Removing Shipping Shields Fig, Ð Roof Curb Detail

AIRFLOW

*Factory supplied (with accessory roof curb). ²Field supplied (when using accessory roof curb).

NOTE: Dimensions are in inches.

Fig. 3 Ð Roof Curb Detail

Rigging Unit Ð Inspect unit for shipping damage, and ®le any damage claim immediately with transportation company.

Lift unit with cables and spreader bars, using lifting brack- ets provided (Fig. 1 and 2). Lift one unit at a time, keep unit upright, and do not drop. Unit weights are given in Table 1. Unit center of gravity is within 6 in. of unit's geometric cen- ter. Eyebolts may be removed after unit is in ®nal position.

IMPORTANT: Do not drill or punch holes in unit frame or panels; damage to internal components or wiring may result.

Unit Positioning Ð When lowering unit onto roof curb, do not exceed the out-of-symmetry tolerances given in Fig. 4 and 5. Be sure unit is level or is pitched within speci- ®ed tolerances. Units have drains on both sides and may be pitched to either side.

Removing Shipping Shields (Fig. 6)

1.Remove shield over ¯ue outlet grille (48MA only).

2.Remove shields (sheet metal covers) located in the outdoor- air inlet screen tracks behind the louvers. If the screens are removed for this procedure, be sure to replace them before replacing the louvered assembly.

Field-Fabricated Ductwork Ð Supply- and return- air openings are shown in Fig. 4 and 5. To simplify supply- air connection, a zone duct plenum may be ®eld fabricated as shown in Fig. 7. It is recommended that this plenum be installed prior to unit positioning.

It is recommended that the unit be supported on blocks temporarily while the duct plenum is installed, rather than installing the plenum while the unit is suspended. The duct plenum may be installed once the unit is located in its ®nal position, but it is much easier to install the plenum prior to unit ®nal placement.

Zone supply-air duct openings on the base unit have tab slot connections similar to those shown in Fig. 7 except that the end partitions are hemmed. Hem is positioned so that the 1-in. ¯ange at entering end of ®eld-fabricated plenum will force-®t between hem and adjacent unit frame.

Standard ¯exible duct connections between duct plenum and duct system may be used. Follow applicable codes.

Insulate any supply-air ducts passing through uncondi- tioned spaces and cover with a vapor barrier. Separate ducts with insulation if they run parallel for more than 5 ft. This will prevent heat transfer between zones.

Install a manual balancing damper in each zone duct to provide the required zone air¯ow.

The return-air duct connection consists of 4 sheet metal ¯anges as shown in Fig. 1, 2, 4, and 5.

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