York DM 240 User Manual
262259-YTG-B-0107
Unitary Products Group
37
GUIDE SPECIFICATIONS
GENERAL
Units shall be manufactured by York International Unitary
Products Group in an ISO 9001 certified facility.
Products Group 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.
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.
Each unit shall have 2 condenser fan motors. A high speed
drive accessory is available for applications with a higher
CFM and/or static pressure requirement. All compressors
include crankcase heat and internal pressure relief. Every
refrigerant circuit includes an expansion valve, a liquid line fil-
ter-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 addi-
tional set of pin connectors to simplify the interface of addi-
tional 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.
drive accessory is available for applications with a higher
CFM and/or static pressure requirement. All compressors
include crankcase heat and internal pressure relief. Every
refrigerant circuit includes an expansion valve, a liquid line fil-
ter-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 addi-
tional set of pin connectors to simplify the interface of addi-
tional 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.
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-
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
CGA listed, classified to ANSIZ21.47 standards, UL 1995/
CAN/CSA No. 236-M90 conditions.
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
CGA listed, classified to ANSIZ21.47 standards, UL 1995/
CAN/CSA No. 236-M90 conditions.
UNIT CABINET
Unit cabinet shall be constructed of G90 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.
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.
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.
Units equipped with VFD’s shall have factory-installed man-
ual bypass as an option.
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.
Units equipped with VFD’s shall have factory-installed man-
ual 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
motors shall be totally enclosed with permanently lubricated
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
motors shall be totally enclosed with permanently lubricated