Johnson Controls 340968-XIM-A-0108 Unit Weights and Center of Gravity, Duct Work, Roof Curb

340968-XIM-A-0108

TABLE 2: UNIT WEIGHTS AND CENTER OF GRAVITY

UNIT	SHIPPING	OPERATING		CORNER WEIGHTS
				(LOCATION, LBS.)
	WEIGHT	WEIGHT
SIZE
	(LBS.)	(LBS.)
				“A”	“B”	“C”	“D”
018	365	360		91	88	89	92
024	365	360		91	88	89	92
030	395	390		98	95	96	99
036	400	395		100	96	98	101
042	415	410		104	100	101	105
048	475	470		119	115	116	120
060	480	475	"D"	120	116	117	122
	"A"FRONTUNITOF				CENTERGRAVITYOF"C"
	49-1/8	25	"B"	25		47-1/4

FIGURE 2 - UNIT CENTER OF GRAVITY

CLEARANCES

All units require certain clearances for proper operation and service. Refer to Table 10 for the clearances required for combustion, construction, servicing and proper unit opera-

tion.

Do not permit overhanging structures or shrubs to obstruct the condenser air discharge, combustion air inlet or vent outlet.

DUCT WORK

These units are adaptable to downflow use as well as rear supply and return air duct openings. To convert to downflow, use the following steps:

1.Remove the duct covers found in the bottom return and supply air duct openings. There are four (4) screws securing each duct cover (save these screws to use later).

2.Install the duct covers, removed in step one, to the rear supply and return air duct openings. Secure with the four

(4) screws used in step one.

3.Seal duct covers with silicone caulk.

Duct work should be designed and sized according to the methods of the Air Conditioning Contractors of America (ACCA), as set forth in their Manual D.

A closed return duct system shall be used. This shall not pre- clude use of economizers or ventilation air intake. Flexible joints may be used in the supply and return duct work to min- imize the transmission of noise.

When fastening duct work to the side duct flanges on the unit, insert the screws through the duct flanges only. Do not insert the screws through the casing. Outdoor ductwork must be insulated and waterproofed.

NOTE: Be sure to note supply and return openings.

Refer to Figure 9 for information concerning rear and bottom supply and return air duct openings.

ROOF CURB

On applications when a roof curb is used, the unit must be positioned on the curb so the front of the unit is tight against the curb.

FILTERS

Single phase units are shipped without a filter and is the responsibility of the installer to secure a filter in the return air ductowrk or install a Filter/Frame Kit (1FF0110 for the DNA018 thru DNA042 and 1FF0112 for the DNA048 and DNA060).

Filters must always be used and must be kept clean. When filters become dirt laden, insufficient air will be delivered by the blower, decreasing your units efficiency and increasing operating costs and wear-and-tear on the unit and controls.

Filters should be checked monthly especially since this unit is used for both heating and cooling.

CONDENSATE DRAIN

A condensate trap is recommended to be installed in the con- densate drain. The plumbing must conform to local codes. Use a sealing compound on male pipe threads. Install the condensate drain line (NPTF) to spill into an open drain.

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