York DM 300 User Manual download pdf (Page 37)

262259-YTG-E-1008

Johnson Controls Unitary Products 37

GUIDE SPECIFICATIONS

GENERAL

Units shall be manufactured by Unitary Products in an ISO

9001 certified facility.

York's Sunline 2000™ units are convertible single package

units. All models have dual independent refrigerant circuits

for efficient part load operation and maximum comfort control.

Although the units are primarily designed for curb mounting

on a roof, they can also be slab-mounted at ground level or

set on steel beams above a finished roof. Cooling only, cool-

ing with gas heat and cooling with electric heat models are

available with a wide variety of factory-mounted options and

field-installed accessories to make them suitable for almost

every application. All units are self-contained and assembled

on full perimeter base rails with holes in the four corners for

overhead rigging. Every unit is completely piped, wired,

charged and tested at the factory to simplify the field installa-

tion and to provide years of dependable operation. All models

(including those with an economizer) are suitable for either

bottom or horizontal duct connections. Models with power

exhaust are suitable for bottom duct connections only. For

bottom duct, remove the sheet metal panels from the supply

and return air openings through the base of the unit. For hori-

zontal duct, replace the supply and return air panels on the

rear of the unit with a side duct flange accessory. All supply

air blowers are equipped with a belt drive that can be

adjusted to meet the exact requirements of the job. A high

static drive option is available for applications with a higher

CFM and/or static pressure requirement.

Each unit shall have 2 condenser fan motors. All compres-

sors include crankcase heat and internal pressure relief.

Every refrigerant circuit includes an expansion valve, a liquid

line filter-drier, a discharge line high pressure switch and a

suction line with a freezestat and low pressure/loss of charge

switch. The unit control circuit includes a 75 VA transformer, a

24-volt circuit breaker and a relay board with two compressor

lockout circuits, a terminal strip for thermostat wiring, plus an

additional set of pin connectors to simplify the interface of

additional field controls. All units have long lasting powder

paint cabinets with 1000 hour salt spray test approval under

ASTM-B117 procedures. All models are CSA approved. All

models include a 1-year limited warranty on the complete

unit. Compressors and electric heater elements carry an

additional 4-year warranty. Aluminized steel tubular heat

exchangers carry an additional 9-year warranty.

DESCRIPTION

Units shall be factory-assembled, single packaged, DM***N

Electric Cooling/Gas Heat, DM***C/E Electric Cooling/

Optional Electric Heat, designed for outdoor mounted instal-

lation. The 15, 20 and 25 ton units shall have minimum EER

ratings of 8.5.

They shall have built-in field convertible duct connections for

down discharge supply/return or horizontal discharge supply/

return, and be available with factory installed options or field

installed accessories. The units shall be factory wired, piped,

charged with R-22 refrigerant and factory tested prior to ship-

ment. All unit wiring shall be both numbered and color coded.

All units shall be manufactured in a facility certified to ISO

9001 standards and the cooling performance shall be rated in

accordance with DOE and ARI test procedures. Units shall be

CSA listed, classified to ANSIZ21.47 standards, UL 1995/

CAN/CSA No. 236-M90 conditions.

UNIT CABINET

Unit cabinet shall be constructed of galvanized steel, with

exterior surfaces coated with a non-chalking, powdered paint

finish, certified at 1000 hours salt spray test per ASTM-B117

standards. Indoor blower section shall be insulated with a min-

imum 1/2" thick insulation, coated on the airside. Aluminum

foil faced insulation shall be used in the furnace compartment

and be fastened with ridged fasteners to prevent insulation

from entering the air stream. Cabinet panels shall be "large"

size, easily removable for servicing and maintenance. Full

perimeter base rails shall be provided to assure reliable transit

of equipment, overhead rigging and proper sealing on roof

curb applications. Disposable 2" filters shall be furnished and

be accessible through a removable access door, sealed air-

tight. Units filter track shall be designed to accommodate

either 2" or 4" filters. Fan performance measuring ports shall

be provided on the outside of the cabinet to allow accurate air

measurements of evaporator fan performance without remov-

ing panels or creating air by-pass of the coils. Condensate

pan shall be internally sloped and conform to ASHRAE 62-89

self-draining standards. Condensate connection shall be a

minimum of 1" I.D. female and be a ridged mount connection.

Unit shall incorporate a fixed outdoor air damper with an out-

door air intake opening covered with a bird screen and a rain

hood painted to match the exterior of the unit.

INDOOR (EVAPORATOR) FAN ASSEMBLY

Fan shall be a belt drive assembly and include an adjustable-

pitch motor pulley. Job site selected (B.H.P.) brake horse-

power shall not exceed the motors nameplate horsepower

rating, plus the service factor. Units shall be designed not to

operate above service factor. Fan wheel shall be double-inlet

type with forward-curved blades, dynamically balanced to

operate smoothly throughout the entire range of operation.

Airflow design shall be constant air volume.

A variable air volume (VAV) option using a variable frequency

drive (VFD) is available for applications requiring a constant

supply duct static pressure. Units equipped for VAV shall be

controlled by a duct pressure transducer with a 0 - 5” WC

pressure range. The pressure transducer shall provide a 0 - 5

VDC output signal to a VAV control board which, in turn shall

provide a 2 - 10 VDC speed reference signal to the VFD. The

VAV control board shall operate using factory-installed Supply

Air, Return Air and Outside Air Temperature Sensors. Units

equipped with VFD’s shall have factory-installed manual

bypass as an option.

OUTDOOR (CONDENSER) FAN ASSEMBLY

The outdoor fans shall be of the direct-driven propeller type,

discharge air vertically, have aluminum blades riveted to cor-

rosion resistant steel spider brackets and shall be dynami-

cally balanced for smooth operation. The 2 outdoor fan

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York DM 300 User Manual Page 37

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