York MA installation manual Duct Connectors, Air Filters, Suspension Kits, UIM-A-0806

262675-UIM-A-0806

J

E

10-3/8”

K

A

TOP OUTLET

DIMENSIONS

CIRCUIT BREAKER

PANEL

22”

B

20-1/2”D

BOTTOM INLET

DIMENSIONS

FIGURE 3: Dimensions & Duct Connection Dimensions

TABLE 1: Dimensions

MA			Dimensions			Wiring Knockouts1
	A	B		D	E	J	K
MODELS
	Height	Width				Power	Control
08B		17-1/2		16-1/2	14-19/32
12B		17-1/2		16-1/2	14-19/32	7/8” (1/2”)
14D	25	24-1/2		23-1/2	21-19/32	1 3/8” (1”)	7/8” (1/2”)
						1 23/32” (1 1/4”)
16C		21		20	18-3/32
20D		24-1/2		23-1/2	21-19/32

1. Actual size (Conduit size).

DUCT CONNECTORS

Use 1/2" screws to connect ductwork to bottom of unit. Longer screws will pierce the drain pan and cause leakage. If pilot holes are drilled, drill only though field duct and unit bottom flange.

Air supply and return may be handled in one of several ways best suited to the installation. See Figure 3 for dimensions for duct inlet and outlet connections.

The vast majority of problems encountered with combination heating and cooling systems can be linked to improperly designed or installed duct systems. It is therefore highly important to the success of an instal- lation that the duct system be properly designed and installed.

Use flexible duct collars to minimize the transmission of vibration/noise into the conditioned space. If electric heat is used, non-flammable material must be used.

Where return air duct is short, or where sound may be a problem, sound absorbing glass fiber should be used inside the duct. Insulation of duct work is a must where it runs through an unheated space during the heating season or through an uncooled space during the cooling season. The use of a vapor barrier is recommended to prevent absorp- tion of moisture from the surrounding air into the insulation.

The supply air duct should be properly sized by use of a transition to match unit opening. All ducts should be suspended using flexible hang- ers and never fastened directly to the structure. This unit is not designed for non-ducted (freeblow) applications. Size outlet plenum or transition to discharge opening sizes shown in Figure 3.

Duct work should be fabricated and installed in accordance with local and/or national codes. This includes the standards of the National Fire Protection Association for Installation of Air-Conditioning and Ventilat- ing Systems, NFPA No. 90B.

AIR FILTERS

Air filters and filter racks must be field supplied.

.

Equipment should never be operated without filters.

SUSPENSION KITS

A suspension kit is available. Models 1BH0601 (unit size 018-060) is designed specifically for the units contained in this instruction (upflow application only). For installation of these accessory kits, see the instructions packed with the kit.

4 Unitary Products Group