Brazed Plate Heat Exchanger 28 Plate 653 PSI Refrigerant R410A R404A R134a Onda S09 H-28 316L Stainless Steel HVAC Refrigeration Evaporator Condenser

This Onda S.p.A. S09 H-28 brazed plate heat exchanger is a new-in-box, 28-plate single-circuit unit for refrigeration and HVAC heat transfer. It uses 316L stainless steel plates copper-brazed for corrosion resistance and thermal efficiency, carries a 653 PSI design rating on both sides, and handles all common refrigerants except ammonia, including R410A, R404A, R134a, and R22. Compact at roughly 13 in long by 3 in wide by 4 in deep (7 lb), it suits condensing units, heat pumps, chillers, and water-to-refrigerant applications around 2.1 tons. Connections follow the standard Onda S09 single-circuit layout (config AA, four ports F1-F2-W1-W2), all smooth solder/sweat (braze) stub-outs in two sizes measured off the physical unit: the larger refrigerant ports at approximately 3/4 in OD (0.850 in) and the smaller secondary-fluid ports at approximately 3/8 in OD (0.480 in). All connections are designed to be silver-brazed directly to the line set — no threads. Confirm exact port sizing against the physical unit before brazing, as Onda builds special-connection variants. The unit is UL Listed (file SA32758), built under PED and ISO 9001, and ships new in box. OEM code X009028AA20002, serial R2204598-008, built 2022. King Surplus offers this as a high-confidence item backed by a 100 percent 14-day money-back guarantee less shipping. Surplus pricing well below new distributor list makes this an efficient replacement or spare for refrigeration technicians, OEM builders, and maintenance operations.

FACTORY SPECIFICATIONS — Onda S.p.A. S09 H-28 Brazed Plate Heat Exchanger

Manufacturer: Onda S.p.A. (Mussolente, Italy)
Model: S09 H-28 (S09 family, High Pressure, 28 plates)
OEM Code: X009028AA20002
Serial Number: R2204598-008
Built: 2022

Construction:

• Plate material: 316L stainless steel
• Brazing material: Copper (Cu)
• Configuration: Single circuit, 28 plates, config AA (F1-F2-W1-W2)

Performance:

• Design pressure: 653 PSI (per UL nameplate)
• Temperature range: -320 F to 435 F
• Channel volume: 0.18 / 0.20 Gal
• Refrigerants: All except ammonia (R410A, R404A, R134a, R22, HCFC/HFC)
• Approximate capacity: 2.1 tons (application-dependent)

Connections (measured off physical unit; confirm before brazing):

• All four ports (F1, F2, W1, W2): smooth solder/sweat stub-outs, same size, approx 3/4 in OD (0.850 in measured)
• Connection type: ODS (outside-diameter solder), silver-braze directly to line set — no threads
• Note: Onda factory config AA normally lists mixed connections (S18/S20 solder on F1/F2, C22 gas thread on W1/W2); this physical unit measures as all-solder, same size — a special-connection variant. Verify all four ports physically before quoting fittings.

Certifications: UL Listed file SA32758, PED 2014/68/EU, ISO 9001
Dimensions: approx 13 in L x 3 in W x 4 in H, 7 lb
Condition: New in box