York R-410A User Manual download pdf (Page 11)

528194-YTG-F-1210

Johnson Controls Unitary Products 11

UNIT CABINET

Unit cabinet shall be constructed of galvanized steel with

exterior surfaces coated with a non-chalking, powder paint

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

standards. Indoor blower sections shall be insulated with up to

1” thick insulation coated on the airside. Either aluminum foil

faced or elastometric rubber insulation shall be used in the

unit’s compartments and be fastened to prevent insulation from

entering the air stream. Cabinet doors shall be hinged with

toolless access for easy servicing and maintenance. Full

perimeter base rails shall be provided to assure reliable transit

of equipment, overhead rigging, fork truck access and proper

sealing on roof curb applications. Disposable 2” filters shall be

furnished as standard and be accessible through hinged access

door. Fan performance measuring ports shall be provided on

the outside of the cabinet to allow accurate air measurements

of evaporator fan performance without removing panels or

creating bypass of the coils. Condensate pan shall be slide out

design, constructed of a non corrosive material, internally

sloped and conforming to ASHRAE 62-B9 standards.

Condensate connection shall be a minimum of ¾” I.D. female

and be rigid mount connection.

INDOOR (EVAPORATOR) FAN ASSEMBLY

Fan shall be a belt drive assembly and include an adjustable

pitch motor pulley. Job site selected brake horsepower shall not

exceed the motors nameplate horsepower rating plus the ser-

vice factor. Units shall be designed to operate within the service

factor. Fan wheel shall be double inlet type with forward curve

blades, dynamically balanced to operate smoothly throughout

the entire range of operation. Airflow design shall be constant

volume. Bearings shall be sealed and permanently lubricated

for longer life and no maintenance. Entire blower assembly and

motor shall be slide out design.

OUTDOOR (CONDENSER) FAN ASSEMBLY

The outdoor fans shall be of the direct drive type, discharge air

vertically, have aluminum blades riveted to corrosion resistant

steel spider brackets and shall be dynamically balanced for

smooth operation. The outdoor fan motors shall have permanently

lubricated bearings internally protected against overload

conditions and staged independently. A cleaning window shall be

provided on two sides of the units for coil cleaning.

REFRIGERANT COMPONENTS

Compressors:

a. Shall be fully hermetic type, direct drive, internally

protected with internal high-pressure relief and over

temperature protection. The hermetic motor shall be

suction gas cooled and have a voltage range of + or –

10% of the unit nameplate voltage.

b. Shall have internal spring isolation and sound muffling to

minimize vibration and noise, and be externally isolated

on a dedicated, independent mounting.

Coils:

a. Evaporator coils shall have aluminum plate fins

mechanically bonded to seamless internally enhanced

copper tubes with all joints brazed. Special Phenolic

coating shall be available as a factory option.

b. Evaporator coils shall be of the direct expansion, draw-

thru design.

c. Condenser coils shall have Mirco-Channel aluminum

tube, aluminum fins.

d. Condenser coils shall be of the direct expansion, draw-

thru design.

Refrigerant Circuit and Refrigerant Safety Components shall

include:

a. Independent fixed-orifice or thermally operated

expansion devices.

b. Solid core filter drier/strainer to eliminate any moisture or

foreign matter.

c. Accessible service gage connections on both suction

and discharge lines to charge, evacuate, and measure

refrigerant pressure during any necessary servicing or

troubleshooting, without losing charge.

d. The unit shall have two independent refrigerant circuits,

equally split in 50% capacity increments.

Unit Controls:

a. Unit shall be complete with self-contained low-voltage

control circuit protected by a resettable circuit breaker on

the 24-volt transformer side.

b. Unit shall incorporate a lockout circuit which provides

reset capability at the space thermostat or base unit

should any of the following standard safety devices trip

and shut off compressor:

c. Loss-of-charge/Low-pressure switch.

• High-pressure switch.

• Freeze-protection thermostat, evaporator coil. If any of

the above safety devices trip, an LED (light-emitting

diode) indicator shall flash a diagnostic code that

indicates which safety switch has tripped.

d. Unit shall incorporate “AUTO RESET” compressor over

temperature, over current protection.

e. Unit shall operate with conventional thermostat designs

and have a low voltage terminal strip for easy hook-up.

f. Unit control board shall have on-board diagnostics and

fault code display.

g. Standard controls shall include anti-short cycle and low

voltage protection, and permit cooling operation down to

0 ºF.

h. Control board shall monitor each refrigerant safety switch

independently.

i. Control board shall retain last 5 fault codes in non-

volatile memory, which will not be lost in the event of a

power loss.

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York R-410A User Manual Page 11

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