Carrier 50HG014-028 installation instructions Make Unit Duct Connections

ALIGNMENT

HOLE

(IN BASE RAIL)

EDGE FLANGE

ALIGNMENT

HOLE SHOULD LINE UP WITH ROOF CURB EDGE FLANGE

HORIZONTAL APPLICATIONS — Horizontal units are shipped with outer panels that allow for side by side horizontal duct connections. If specified during ordering, the unit will be shipped with the vertical duct openings blocked off from the factory, ready for side supply installation. If the horizontal option was not specified at time of ordering the unit, a field- installed accessory kit is required to convert the vertical unit into a horizontal supply configuration.

Installation of the duct block-off covers should be complet- ed prior to placing the unit unless sufficient side clearance is available. A minimum of 66-in. is required between the unit and any obstruction to install the duct block-off covers. Side

Fig. 5 — Alignment Hole Details

ALIGNMENT

HOLES FOR

HJ, TJ, DP, DR

CURB-BOTH

SIDES

RETURN SUPPLY

OPENING OPENING

	CURB	CURB
	RETURN	SUPPLY
	OPENING	OPENING
ALIGNMENT
HOLES FOR HG
CURB-BOTH
SIDES	ROOF CURB

Fig. 6 — Alignment Hole Location

Step 4 — Field Fabricate Ductwork — Secure all ducts to building structure. Use flexible duct connectors be- tween unit and ducts as required. Insulate and weatherproof all external ductwork, joints, and roof openings with counter flashing and mastic in accordance with applicable codes.

Ducts passing through an unconditioned space must be in- sulated and covered with a vapor barrier.

Step 5 — Make Unit Duct Connections

VERTICAL CONFIGURATION — Unit is shipped for thru- the-bottom duct connections. Ductwork openings are shown in Fig. 1 and 4. Duct connections for vertical supply and return configuration are shown in Fig. 7. Field fabricated concentric ductwork may be connected as shown in Fig. 8 and 9. The unit is designed to attach the ductwork to the roof curb. Do not attach duct directly to the unit basepans.

Unit basepans must be supported under the unit and around duct openings in order to prevent air leakage.

For vertical supply and return units, tools or parts could drop into ductwork and cause an injury. Install a 90-degree turn in the return ductwork between the unit and the condi- tioned space. If a 90-degree elbow cannot be installed, then a grille of sufficient strength and density should be installed to prevent objects from falling into the conditioned space.

Units with electric heat require a 1-in. clearance for the first

24 in. of ductwork. Outlet grilles must not lie directly below unit discharge.

NOTE: A 90-degree elbow must be provided in the supply ductwork to comply with UL (Underwriters’ Laboratories) codes for use with electric heat.

supply duct dimensions and locations are shown on Fig. 4. Connect ductwork to horizontal duct flange connections on side of unit.

ECONOMIZER

	SEE	SEE
	NOTE
		NOTE
AIR		AIR
IN		OUT

NOTE: Do not drill in this area; damage to basepan may result in water leak.

Fig. 7 — Air Distribution —

Vertical Supply and Return

ECONOMIZER

SEE		SEE
NOTE		NOTE
AIR OUT	AIR IN	AIR OUT

NOTE: Do not drill in this area; damage to basepan may result in water leak.

Fig. 8 — Air Distribution — Concentric Duct

8