York R-410A ZH/ZJ/ZR Series 用户手册

528150-YTG-G-1210

Johnson Controls Unitary Products

13

factory wired, piped and charged with R-410A refrigerant and 
factory tested prior to shipment. All unit wiring shall be both 
numbered and color coded. The cooling performance shall be 
rated in accordance with DOE and ARI test procedures. Units shall 
be CSA certified to ANSI Z21.47 and UL 1995/CAN/CSA No. 236-
M90 standards.

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.

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.

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.

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 aluminum plate fins 

mechanically bonded to seamless internally enhanced 
copper tubes with all joints brazed or Micro-Channel 
aluminum tube, aluminum fins.

d. Condenser coils shall be of the 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 6-1/2 through 12-1/2 ton 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:

• 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.

c. Unit shall incorporate “AUTO RESET” compressor over 

temperature, over current protection.

d. Unit shall operate with conventional thermostat designs 

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

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

fault code display.

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

voltage protection, and permit cooling operation down to 
0 ºF.