Compact accumulator integrating a liquid–suction internal heat exchanger to prevent liquid slugging, improve oil return, and increase system efficiency by subcooling liquid and superheating suction gas. Sizes from 1.6 L to 18 L, ODF solder connections, customization available.
Product Description
KAK IHX accumulators combine a vertical suction accumulator with a built-in liquid–suction heat exchanger. The liquid line passes through a coil/U-tube inside the shell:
• Protects the compressor by trapping liquid refrigerant and returning oil/refrigerant vapor through a calibrated orifice.
• Enhances efficiency: the internal HX subcools the liquid line and adds superheat to the suction gas, reducing flash gas at the expansion device.
• Easy piping with clearly identified suction and liquid connections; optional mounting pads and brackets.
Key Features
• Integrated IHX for higher system COP and better compressor protection
• Calibrated oil return orifice (specify size on order) to ensure stable oil return
• ODF solder or SAE flare connections; vertical mounting with bottom drain/Schrader optional
• Powder-coated steel shell with anti-corrosion finish; 100% leak tested
• Compatible with R410A / R404A / R134a / R32 / R290
• Design pressure up to e.g. 3.0–4.5 MPa; Operating -40~+120 °C
• CE marking; UL/CSA on request
Typical Applications
Heat pumps, split AC, condensing units, refrigeration systems, low-temperature cold rooms.
Size Chart（regular models）
| Model | Suction line (in) | Liquid line (in) | ΦD (mm) | H (mm) | H1 (mm) | A (mm) | B (mm) | Volume (L) | Schematic |
|---|---|---|---|---|---|---|---|---|---|
| KAK-2404 | 1/2” | 3/8” | 102 | 224 | 30 | 53 | 53 | 1.6 | a |
| KAK-2405 | 5/8” | 3/8” | 102 | 264 | 30 | 53 | 53 | 1.9 | a |
| KAK-2406 | 3/4” | 1/2” | 140 | 276 | 36 | 80 | 80 | 3.8 | a |
| KAK-2407 | 7/8” | 1/2” | 140 | 326 | 36 | 80 | 80 | 4.4 | a |
| KAK-2411 | 1-1/8” | 5/8” | 165 | 413 | 40 | 82 | 82 | 8.0 | a |
| KAK-2413 | 1-3/8” | 3/4” | 165 | 533 | 40 | 82 | 82 | 10.5 | a |
| KAK-2415 | 1-5/8” | 7/8” | 165 | 583 | 40 | 82 | 82 | 11.5 | a |
| KAK-2421 | 2-1/8” | 7/8” | 219 | 490 | 50 | 120 | 120 | 18.0 | b |
Customization Options
• Shell size/volume, connection sizes & type (ODF/SAE), bracket style, coating color
• Refrigerant compatibility, oil return orifice size, design pressure rating, added service ports
Materials & Finish
• Shell: carbon steel (DC04/SPCC) with epoxy/polyester powder coating（black）
• Tubes: T2 copper (or 304/316 SS on request)
• Brazing with nitrogen purge; inside dried & capped
FAQ
It prevents compressor liquid slugging while improving efficiency by subcooling the liquid and adding suction superheat.
Match suction line size + system capacity. As a rule of thumb, choose a volume that can temporarily store the expected liquid floodback during defrost/start-up
Yes if the design pressure rating and sealing meet the refrigerant requirements—confirm pressure class and local code (EN/UL) before ordering.
Install vertical, keep the oil return orifice oriented correctly. Suction outlet should be above the liquid level. Provide a sight/service port if needed.
Typically a copper U-tube/coil passing the liquid line through the shell. We can tailor tube size/length for desired subcooling.
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