251934-YTG-J-0910

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 corrosion resistant steel spider brackets and shall be dynamically balanced for smooth operation. The 4 outdoor fan motors shall be totally enclosed with permanently lubricated bearings, internally protected against overload conditions and staged independently.

Refrigerant Components

Compressors:

a. Shall be Scroll compressors internally protected with internal high-pressure relief and over temperature protection.

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 and condenser 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 and Condenser coils shall be of the direct expansion, draw-thru, design.

Refrigerant Circuit and Refrigerant Safety Components shall include:

a. Balance-port thermostatic expansion valve with independent circuit feed system.

b. 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 refrigeration system shall provide at least 15° F of sub-cooling at design conditions.

e. All models shall have four independent circuits.

f. Hot gas bypass option shall be factory-installed on compressor #1 discharge line to provide cooling in low- load applications. HGBP shall be a standard feature on VAV models and an optional feature on CV models.

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.

1.High-pressure switch.

2.Freeze-protection thermostat, evaporator coil. If any of the above safety devices trip, a 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°F.

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.

Gas Heating Section (ZJ/ZR/ZF***N Models)

Shall be designed with induced draft combustion with post purge logic and energy saving direct spark ignition, redundant main gas valve. Ventor wheel shall be constructed of stainless steel for corrosion resistance. The heat exchanger shall be of the tubular type, constructed of T1-40 aluminized steel for corrosion resistance and allowing minimum mixed air entering temperature of 25 °F. Burners shall be of the in-shot type, constructed of aluminum coated steel and contain air mixture adjustments. All gas piping shall enter the unit cabinet at a single location through either the side or curb, without any field modifications. An integrated control board shall provide timed control of evaporator fan functioning and burner ignition. Heating section shall be provided with the following minimum protection:

a.Primary and auxiliary high-temperature limit switches.

b.Induced draft motor speed sensor.

c.Flame roll out switch (automatic reset).

d.Flame proving controls. Unit shall have two independent stages of capacity.

10

Johnson Controls Unitary Products

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York 251934-YTG-J-0910 manual Outdoor Condenser Fan Assembly, Refrigerant Components, Unit Controls
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251934-YTG-J-0910 specifications

York 251934-YTG-J-0910 is an innovative climate control system designed for both residential and commercial applications. This unit stands out for its advanced engineering, eco-friendly technologies, and user-centric features. With a focus on efficiency and sustainability, the York 251934-YTG-J-0910 offers a powerful solution for maintaining optimal indoor climates.

One of the main features of the York 251934-YTG-J-0910 is its high-efficiency operation. The unit boasts impressive Seasonal Energy Efficiency Ratio (SEER) and Heating Seasonal Performance Factor (HSPF) ratings, which indicate its ability to provide significant energy savings compared to traditional systems. The use of variable speed technology further enhances its efficiency, allowing the system to adjust its output based on real-time demand, leading to quieter operation and reduced energy consumption.

The York 251934-YTG-J-0910 incorporates cutting-edge inverter technology, which enables smooth transitions between different performance levels. This ensures consistent comfort while minimizing energy usage, making it an ideal choice for eco-conscious consumers. The unit also includes advanced inverter-driven compressors that enable faster cooling and heating capabilities, providing rapid comfort during extreme temperature conditions.

In terms of environmental impact, the York 251934-YTG-J-0910 is designed to operate with lowGlobal Warming Potential (GWP) refrigerants. This not only contributes to reduced greenhouse gas emissions but also aligns with global sustainability efforts. The unit is compliant with various environmental regulations, making it a responsible choice for climate-conscious users.

Another notable characteristic of this system is its intuitive smart controls. The York 251934-YTG-J-0910 is compatible with Wi-Fi-enabled thermostats and smart home systems, allowing users to monitor and adjust their indoor climate remotely. This level of connectivity offers convenience, energy management, and peace of mind.

Durability and reliability are also paramount to the York brand, and the 251934-YTG-J-0910 reflects this commitment. The unit features a robust construction with corrosion-resistant materials, ensuring longevity even in the harshest environments. Comprehensive warranties accompany the product, underlining the manufacturer’s confidence in its performance and durability.

In summary, the York 251934-YTG-J-0910 combines high efficiency, advanced technology, environmental responsibility, and user-friendly features, positioning it as a top contender in the climate control market. With its commitment to comfort and sustainability, it appeals to both residential and commercial users looking for reliable and efficient climate management solutions.
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