York DJ 048 Manuale di Installazione Scaricare il pdf (Pagina 15)

170652-YIM-A-1105

Unitary Products Group 15

6. Maintain level tolerance to 1/2 inch maximum

across the entire length or width of the unit.

If a unit is to be installed on a roof curb or special frame

other than a YORK roof curb, gasketing must be

applied to all surfaces that come in contact with the unit

underside.

RIGGING AND HANDLING

Exercise care when moving the unit. Do not remove

any packaging until the unit is near the place of installa-

tion. Rig the unit by attaching chain or cable slings to

the lifting holes provided in the base rails. Spreader

bars, whose length exceeds the largest dimension

across the unit, MUST BE USED.

Units may also be moved or lifted with a forklift. Slotted

openings in the base rails are provided for this pur-

pose. Fork lengths must be a minimum of 42 inches.

Remove the nesting brackets from the four corners on

the top of the unit. All screws that are removed when

removing the brackets must be replaced on the unit.

Refer to Table 9 for unit weights and to the Figure 9 for

approximate center of gravity.

CLEARANCES

All units require certain clearances for proper operation

and service. Installer must make provisions for ade-

quate combustion and ventilation air in accordance with

Section 5.3, Air for Combustion and Ventilation of the

National Fuel Gas Code, ANSI Z223.1 (in U.S.A.) or

Sections 7.2, 7.3 or 7.4 of Gas Installation Codes CSA-

B149.1 (in Canada) and/or applicable provisions of the

local building codes. Refer to Dimensions and Clear-

ances shown in Figures 10 through 13 and Tables 14

and 15 for the clearances required for combustible con-

struction, servicing, and proper unit operation.

DUCTWORK

Ductwork should be designed and sized according to

the methods in Manual Q of the Air Conditioning Con-

tractors of America (ACCA).

A closed return duct system shall be used. This shall

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 requirements of the

job. They should NOT be sized to match the dimen-

sions of the duct connections on the unit.

Refer to Figures 10 through 14 for information concern-

ing side and bottom supply and return air duct openings.

NOTE: It is recommended that, in Canada, the outlet

duct be provided with a removable access

panel. It is recommended that this opening be

Excessive exposure of this furnace to contami-

nated combustion air may result in equipment

damage or personal injury. Typical contami-

nates include: permanent wave solutions, chlo-

rinated waxes and cleaners, chlorine based

swimming pool chemicals, water softening

chemicals, carbon tetrachloride, Halogen type

refrigerants, cleaning solvents (e.g. perchloro-

ethylene), printing inks, paint removers, var-

nishes, hydrochloric acid, cements and glues,

antistatic fabric softeners for clothes dryers,

masonry acid washing materials.

Before lifting a unit, make sure that all panels

are in place and that its weight is distributed

equally on all cables so it will lift evenly.

Do not permit overhanging structures or shrubs

to obstruct outdoor air discharge outlet, com-

bustion air inlet or vent outlets.

When fastening ductwork to side duct flanges

on unit, insert screws through duct flanges

only. DO NOT insert screws through casing.

Outdoor ductwork must be insulated and

waterproofed.

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York DJ 048 Manuale di Installazione Pagina 15

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