York BP120, BP 090 installation manual Rear Duct Dimensions Ductwork Duct Covers

66307-YIM-B-0606

18-1/4

(465)

	Return	28-1/4
		(720)
	Air
	Supply
	Air
18-1/4	PatchPlate
(465)
	ForSlide-Out	18-1/16
	DrainPan	(460)
	2-31/32
5-5/32	(75)
	28-1/4

(130)(720)

	NOTE:(XXX)indicatesmilimeters		31-11/16
		(805)
FIGURE 10 - REAR DUCT DIMENSIONS
DUCTWORK	DUCT COVERS

Ductwork should be designed and sized according to the methods in Manual D of the Air Conditioning Contractors of America (ACCA) or as recommended by any other recog- nized authority such as ASHRAE or SMACNA.

A closed return duct system should be used. This will not preclude use of economizers or outdoor fresh air intake. The supply and return air duct connections at the unit should be made with flexible joints to minimize noise.

The supply and return air duct systems should be designed for the CFM and static pressure requirements of the job. They should NOT be sized to match the dimensions of the duct connections on the unit.

Refer to Figure 9 for bottom air duct openings. Refer to Fig- ure 10 for rear air duct openings.

Units are shipped with the side duct openings covered and a covering over the bottom of the unit. For bottom duct applica- tion, no duct cover changes are necessary. For side duct application, remove the side duct covers and install over the bottom duct openings. The panels removed from the side duct connections are designed to be reused by securing each panel to its respective downflow opening. But keep in mind that the supply panel is installed with the painted surface UP, facing the heat exchanger, while the return panel is installed with the painted surface DOWN, facing the downflow duct opening. The supply panel is secured with the bracket (already in place from the factory) and two screws. It’s a snug fit for the panel when sliding it between the heat exchanger and unit bottom, but there is room. The return panel is secured with four screws.

Unitary Products Group 13