York 4 ton Commercial Roof Top Gas Packaged Unit RTU Low Heat 230V 3 PH
 
ZYG05D2C1EA1C121A4
 
ZY= PKG AC HIGH EFFICIENCY
G= GAS HEAT
05= 4 TON
D= LOW HEAT
2= 208/230-3-60
C= HIGH STATIC
1= NONE
E=
A= SMART EQUIPMENT 
1= NONE (UNITS COME STANDARD WITH FACTORY INSTALLED SUPPLY AIR, RETURN AIR. AND OUTDOOR AIR TEMPERATURE SENSOR)
C= ENTHALPY ECONOMIZER
1= NONE
2= NON-FUSED DISCONNECT
1= NONE
A= NONE
4= FOURTH GENERATION
 
 
Product highlights
• Assembled in Norman, OK
• ASHRAE 90.1 Compliant
• R-410A Refrigerant
• Cooling Only and Gas/Electric configurations available
• Scroll Compressors
• Up to 16.3 IEER and 12.2 EER on the 3 stage cooling advanced building code compliant level.
• Up to 15.4 SEER and 12.2 EER on the Energy Star Compliant Energy Level
• Up to 14.0 SEER and 11.2 EER on the ASHRAE 90.1 Compliant Standard Efficiency Level
• DOE (Department of Energy) Compliant - All models meet minimum DOE efficiencies for
cooling and fan efficiencies. Single phase gas heating products are fan energy rated (FER) to
meet DOE requirements.
• State-of-the-art Microprocessor Controls with specific programming for product applications
• MicroChannel Condenser Coils
• Evaporator coils utilize copper tube/aluminum fin design for proven reliability and
performance.
• TXV (Thermostatic Expansion Valve) Standard on: ASHRAE 90.1 Compliant Standard Efficiency
Level 5 ton to 12.5 ton models, Energy Star Compliant Efficiency Level 3 ton to 10 ton models
and advanced building code compliant efficiency level 7.5 to 12.5 ton models.
• Single-stage Cooling (3 ton to 6 ton models)
• Two-stage Cooling (6 ton to 12.5 ton models)
• Three-stage Cooling available (7.5 ton to 12.5 ton models)
• Alternate Motor and Drives
 
Features & Benefits
Two Tiers of Efficiency
14 SEER standard efficiency provides a cost effective 14 SEER/11.0 EER product that meets ASHRAE
90.1 requirements. The High-efficiency meets the requirements for Energy Star that exceeds
15 SEER and 12 EER. The high efficiency 3-stage cooling units are available from 7.5 tons to
12.5 tons to meet advanced building code requirements. Gas/electric units have electronic spark
ignition and power vented combustion steady state efficiencies of 80%. These efficiencies meet or
exceed all legislated minimum levels providing lower operating costs.
All models utilize scroll compressors
that are environmentally friendly by utilizing
R-410A refrigerant. Use of the scroll compressor
technology means a simple internal design,
fewer moving parts, equating to a quiet,
reliable, easy to service and efficient system.
Internal compressor protection is standard
and compressors include protection to prevent
liquid damage.
Total system design
A TXV is used for precise metering on the 6 ton to 12.5 ton products and a fixed orifice is used to
keep the cost of the product down on the 3 ton to 5 ton product. Two independent refrigerant
circuits and compressors are used on the 7.5 ton to 12.5 ton units for economical and precise
control. A single circuit, single compressor design is used on the 3 ton to 6 ton units for cost
effectiveness and reliability without compromising quality.
System Protection
Liquid line filter-driers, high and low pressure safeties are standard on each independent
refrigerant circuit. Suction line sensors monitor temperature to prevent possible liquid flood back
to the compressors and also protect against loss of charge and coil frosting.