Trane AY28X079 Cooling Kit

Maintain critical head pressure and prevent evaporator freeze-up with the Trane AY28X079 Low Temp Cooling Kit. This evaporator defrost control is a vital integration for commercial and industrial 4TTR6, 4TTA3, and BYC systems, enabling reliable low ambient cooling down to 30°F. By cycling the compressor when the indoor coil approaches frost conditions, this condenser fan cycle control prevents oil dilution and ensures stable HVAC refrigerant pressure in server rooms or process cooling environments.

The kit features a low-ambient temperature sensor and a high-accuracy capillary tube, designed for precise thermal sensing within the coil fins. For veteran technicians, this means a reliable field-installable solution that extends the cooling operating range beyond the standard 55°F factory limit. Ensure the crankcase heater is functional and a non-bleed TXV is present for optimal performance in low-temperature applications.

• Extended Cooling Range: Allows equipment to operate in cooling mode down to 30°F outdoor ambient temperature.
• System Protection: Actively prevents evaporator icing and protects the Climatuff compressor from liquid slugging.
• Versatile Compatibility: Engineered for Trane and American Standard split systems, including 1.5 to 5-ton units.
• Reliable Defrost Logic: The temperature-actuated SPST switch provides consistent cycling compared to standard pressure switches.

• When is the AY28X079 strictly required? This kit is necessary for any application requiring cooling when outdoor temperatures drop below 55°F, such as server rooms or interior commercial zones.
• Does this kit include a crankcase heater? No, while the kit facilitates low ambient operation, a crankcase heater must be installed separately to protect the oil charge.
• Where is the EDC sensor mounted? The capillary tube must be inserted into the full depth of the evaporator coil fins, typically 2 to 6 inches from the header end.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.