faq-VOCKE REFRIGERATION EQUPMENT CO.,LTD

FAQ

Questions about VOCKE semi-hermetic piston compressors and semi-hermetic screw compressors, including selection, installation, troubleshooting, maintenance and service.

How should I address high discharge temperature?

High discharge temperature often results from: low refrigerant charge, high condensing pressure, restricted expansion valve, excessive superheat, or malfunction of the cooling system (e.g., liquid injection). A systematic check of these areas is required.

When should I choose a semi-hermetic screw compressor over a piston compressor?

Semi-hermetic screw compressors are ideal for medium to large systems and applications requiring continuous, heavy-duty operation. Their advantages include smoother operation, lower vibration, longer lifespan, and better suitability for variable speed drives. Semi-hermetic piston compressors offer a cost-effective, compact, and easily maintainable solution for small to medium-sized systems. Our technical team can recommend the most efficient and economical solution for you.

How do I choose the right semi-hermetic compressor for my refrigeration system?

Selecting the correct compressor depends on several factors: refrigerant type, evaporating and condensing temperatures, required cooling capacity, and application (e.g., cold storage, chillers, display cases). We recommend directly Contacting our technical engineers for professional support.

What are the most critical considerations when installing a compressor?

Ensuring a solid foundation for vibration isolation; correctly installing suction and discharge service valves and filter-driers; guaranteeing system cleanliness to prevent contaminants and moisture; following wiring diagrams for proper electrical connections and reliable grounding; and always checking oil level and rotation before initial start-up.

Which refrigerants are compatible with VOCKE compressors?

VOCKE compressors are compatible with a wide range of refrigerants, including R22, R404A, R407C, R134a, as well as newer environmentally friendly options like R448A, R449A, and R513A. Please refer to the specific product's technical datasheet for detailed compatibility.

What checks are necessary before the first start-up of a compressor?

1 Correct power supply voltage and phase sequence; 2 That the crankcase heater has been energized for a sufficient period (typically ≥12 hours); 3 That all system valves are in the correct positions; 4 That high and low-pressure protection settings are correct.

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Tel / WhatsApp: 86-15888911155

E-mail: VK001@vocke-compressors.com

Address: Lingxia Zhu Industrial Park, Jindong District, Jinhua City, Zhejiang Province

Products

Semi-Hermetic Piston (Reciprocating) Refrigeration Compressors

Semi-Hermetic Screw Refrigeration Compressors

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