A: In-stock standard Sitolid refrigeration compressors can be shipped within 3–7 working days after receiving deposit. For customized OEM/ODM compressor orders, the normal production lead time is 15–30 working days after deposit and sample confirmation. For standard models in our warehouse, after deposit arrives, we can arrange QC inspection, packing and shipment quickly, which is suitable for customers with urgent project schedule. For customized orders, we need to arrange raw material procurement, production line adjustment, prototype confirmation, mass production and finished product inspection. The exact lead time depends on order quantity, customization complexity and production schedule. Our production team will update production progress regularly, send production photos for your reference during manufacturing. If there is unexpected delay risk such as raw material supply problem, we will inform you in advance and propose solution. For very large bulk orders, we can discuss partial shipment, deliver goods in batches according to your project construction schedule. All lead time is counted from the date of deposit received and all technical requirements confirmed. We will write down lead time clearly in sales contract and control production schedule strictly.

A: Yes, the unit price will be more favorable with larger order quantity. We can recalculate price based on your actual order volume. When order quantity increases, our raw material purchasing cost will be lower for bulk procurement, production line setup cost will be shared by more units, and unit processing cost will decrease. Therefore we can offer volume discount for big orders. Our discount tier is based on total order quantity, the more units you order, the lower unit price you get. If you have annual procurement plan, we can offer better price for annual framework contract. We suggest customers inform us of their estimated annual demand, so we can give long-term competitive price. When calculating discounted price, we will keep product quality standard unchanged, we will not reduce raw material grade to cut cost for big orders. We will list the price tier clearly in quotation. If you split one big order into multiple shipments, we can still apply bulk discount as agreed in contract. Our sales team will help you calculate total cost including product cost, packing cost and freight cost, to help you evaluate total procurement budget.

A: We accept T/T and L/C payment terms, other payment methods can be negotiated according to order amount and cooperation background. T/T is the most widely used payment method for our overseas customers. Usually we require 30% deposit before production, and 70% balance paid before shipment. After receiving deposit, we arrange raw material purchasing and start production. Before shipment, we will send finished product photos, inspection report and packing photos to you, once we receive balance payment, we arrange loading and send original shipping documents. Irrevocable sight L/C is acceptable for large bulk orders, especially for customers from countries with strict foreign exchange control. Our bank can receive L/C opened by reputable international banks. We will check L/C clauses carefully before acceptance, to avoid unreasonable clauses which will cause difficulty in document presentation. For long-term cooperative customers with good credit record, we can discuss more flexible payment terms. All payment terms will be clearly written in formal sales contract to avoid misunderstanding. We will provide official invoice and bank receipt after receiving payment. Please make payment to our company official bank account only, we never accept private personal account transfer for bulk export orders.

A: Our formal quotation for Sitolid refrigeration compressor is normally valid for 30 days from quotation date. The price may fluctuate due to raw material price fluctuation, exchange rate change and international logistics cost variation. The main raw materials for compressor production are cast iron, copper, alloy metal and electrical components, whose market price changes frequently in global commodity market. If raw material price rises sharply after quotation expires, we have to adjust product price accordingly. Within 30-day validity period, we guarantee the quoted unit price, as long as you issue formal purchase order within this period. When quotation is expired, if you still want to place order, we will recheck raw material price and exchange rate, then send renewed quotation. The quotation includes unit price, MOQ, estimated lead time, payment term, packing method and price term (FOB Ningbo / FOB Shanghai etc.). We will clearly mark price term and tax information in quotation. For long-term framework cooperation customers, we can sign annual price locking agreement to avoid frequent price fluctuation within agreed range. When you receive our quotation, if you have any question about price composition, you can ask our sales team for explanation. We will separate raw material cost, processing cost, packing cost and export operation cost for your reference.

A: Yes, we have an in-house R&D team with rich refrigeration compressor design experience. We can carry out new product development according to your technical requirement and market demand. Our R&D team includes mechanical design engineers, refrigeration system engineers and electrical engineers. The whole new product development process includes requirement analysis, thermodynamic simulation, structural design, 3D modeling, prototype manufacturing, bench performance test, endurance aging test and small batch trial production. During development, we can adjust cooling capacity, energy efficiency, noise level, working temperature range and structural size according to your requirement. We can also optimize design to reduce power consumption, improve reliability and adapt to special refrigerant or harsh working environment. After prototype passes all lab tests, we can arrange small batch trial production to verify mass production feasibility. We can support you to apply for local product certification for newly developed compressor model if needed. We will sign confidential agreement with you to protect your new product development idea and technical specification, and will not sell the newly developed model to other third parties without your permission. New product development will have development cost and certain development cycle, our sales and technical team will inform you the estimated timeline and cost before starting the project.

A: For compressor customization project, you may provide engineering drawings, physical sample of target compressor, or detailed technical parameter requirement sheet, then our technical team will evaluate feasibility and offer formal quotation. If you have existing old compressor sample, sending physical sample is the most efficient way, our engineers can disassemble sample, measure dimensions, analyze internal structure and material, then make copy or optimized redesign. If you have CAD engineering drawings, please provide 2D or 3D drawing with full dimension tolerance, material requirement, voltage, cooling capacity, refrigerant type and working condition description. If you do not have drawings or samples, you can fill in our technical requirement sheet, including target cooling capacity, working temperature range, voltage, refrigerant type, installation dimension limit and special requirement such as anti-corrosion or low noise. After receiving your information, our R&D team will carry out technical evaluation within 1–2 working days, check whether the design is feasible, calculate cost and lead time, then send you technical proposal and quotation. We will point out potential technical risk and optimization suggestion in our evaluation report. After you confirm the technical plan, we will make prototype sample for your test. All customized technical documents will be kept confidential in our system.

A: MOQ for standard Sitolid refrigeration compressors: XX units; MOQ for customized OEM / ODM compressors: XX units. MOQ is set based on our raw material procurement, production setup cost and production scheduling arrangement. For standard models, we have ready stock, so the MOQ is relatively low, suitable for small distributors, maintenance companies and small engineering projects. For customized compressors, we need to open new fixtures, adjust production line, purchase special raw materials and make prototype test, which brings higher setup cost, so customized MOQ is higher. If your order quantity is less than customized MOQ, we can discuss alternative solutions, such as using our existing standard model with simple logo OEM only, which has lower MOQ. If you have long-term annual purchasing plan, we can negotiate to reduce MOQ for long-term framework cooperation. When calculating MOQ, we can support mixed order of multiple standard compressor models, as long as the total quantity meets the MOQ requirement. Our sales team will clearly explain MOQ rule, unit price and lead time in formal quotation, so you can arrange your procurement plan. We will remind customers that for customized compressor orders, once production starts, changing technical parameters will cause extra cost and delay delivery time.

A: Yes, we support OEM and ODM service for Sitolid refrigeration compressors. We can customize logo, nameplate, dimensions, connection structure, technical parameters and export packaging according to customer requirements. OEM service means printing your brand logo, company name and customized nameplate on compressor body and outer package. It helps you build your own brand in local market, and sell compressors under your own brand without developing production by yourself. ODM service means we develop new compressor models based on your technical requirement, including modifying internal structure, adjusting cooling capacity, changing voltage or refrigerant matching. Our R&D team will participate in the whole ODM development process, carry out design simulation, prototype making, performance test and reliability verification. We can customize outer carton, color box, user manual and marking on plywood case for export packaging. All customized products will keep our strict quality control system. Before formal mass production of OEM/ODM products, we will make pre-production sample for your confirmation, only after you approve the sample, we start mass production. We will strictly protect your brand information and customized technical design, and will not disclose your customized specification to other customers. We have rich OEM cooperation experience with many overseas refrigeration equipment companies and cold room engineering enterprises.

A: Samples and mass production compressors follow identical raw material standard, production technology and finished inspection standard, so the quality and performance are consistent. Many buyers worry that manufacturers will send high-quality samples while producing inferior bulk goods, this is a common risk in international sourcing. In our factory, there is no separate production line only for samples. The sample compressor is selected from the same production batch and same production line as bulk products. The raw material batch, machining standard, assembly process and performance test criteria are fully consistent. Before sample delivery, we carry out the same full inspection items as bulk products, including pressure test, running test, noise test and electrical safety test. We will record sample serial number and test data, and keep the test record in our factory system. When mass production starts for your bulk order, our QC team will follow the same inspection checklist and raw material specification. We can provide batch inspection report for bulk shipment, and you can arrange third-party inspection on bulk goods before loading. If you want, we can reserve one unit from bulk production batch as a reference sample for your comparison. If any quality inconsistency is found between sample and bulk goods after receiving bulk shipment, we will actively negotiate solution according to contract terms. Our quality control system focuses on batch consistency, which is the core advantage as a professional refrigeration compressor manufacturer.

A: Standard compressor samples will be shipped out within 3–7 working days after sample payment is confirmed. The buyer shall bear the sample international freight cost. For standard model samples in stock, we can finish internal inspection, packing and arrange shipment quickly within 3–7 working days. For customized prototype samples, the production time will be longer, we will inform you the exact lead time before sample order. Since compressor sample belongs to heavy mechanical product, international freight cost by air express or sea freight will be calculated based on actual weight and volume. We can help you check freight quotation from multiple forwarders for your reference, and you can choose your own freight forwarder to arrange pickup from our factory. The freight cost includes international transportation fee, customs clearance fee and local destination handling charge in most cases. We will provide all export documents including commercial invoice, packing list, certificate for customs clearance of sample shipment. For sample shipment, we use strong plywood export case to protect compressor from collision damage during international transit. Before shipment, we will take photos and videos of finished packing for your confirmation. The buyer is responsible for import customs clearance in destination country and related import tax. If you have any special requirement for sample shipping mark or document, we can modify accordingly.

A: Yes, we can provide Sitolid refrigeration compressor samples for your performance testing, system matching test and laboratory evaluation. The sample fee will be fully refunded once you confirm and place formal bulk order with us. For many refrigeration engineering buyers and equipment manufacturers, sample test is essential before mass procurement, to verify compressor cooling performance, noise level, power consumption and compatibility with your existing refrigeration system. You can select standard model sample from our existing inventory. If you need customized compressor sample with special parameters, we can arrange prototype production, but the sample lead time and cost will be different from standard samples. After sample arrives, you can carry out bench test or install sample into your refrigeration system to test actual running performance. Our technical team can provide technical guidance for sample installation and test. Please note that sample is for performance verification only, and the sample’s warranty rule is different from bulk products. When you place bulk order later, the sample cost will be deducted directly from your bulk order payment. This policy helps overseas customers reduce pre-investment risk for product verification. Before sending samples, we will carry out full inspection and performance test for sample compressor, pack it with export plywood case, and send inspection report together with sample. We can also provide sample packing photo, test video before shipment.

A: Under normal and correct working conditions, Sitolid refrigeration compressor can reach XX hours service life. We can provide professional performance test report including temperature resistance, pressure resistance and endurance test data. The compressor is designed to adapt to wide ambient temperature range. It can work stably under high ambient temperature in tropical area and low temperature environment in cold regions. Internal components are treated with anti-corrosion coating, which can resist weak corrosive gas in ordinary cold storage environment. But we need to remind customers that strong corrosive environment with ammonia, strong acid or strong alkali gas will damage compressor internal parts and sealing structure, and special anti-corrosion customized design is required for such harsh working environment. Service life is highly related to system matching, installation quality, regular maintenance and refrigerant type. If the refrigeration system is well matched, oil return is normal, and regular maintenance is carried out according to operation manual, the compressor can reach the designed service life. Improper operation such as liquid hammer, wrong refrigerant filling, unstable voltage and lack of lubricating oil will greatly shorten service life and cause sudden failure. Our performance test report includes continuous running endurance test, high-low temperature cycle test and pressure cycling test data, which can be used for project bidding, engineering design and product acceptance. Our technical team can also provide operation maintenance guide to help your end users extend compressor service life and reduce failure rate. We will mark the working limit parameters in product manual, remind customers of operation boundary and forbidden working conditions.

A: Sitolid refrigeration compressor is widely used in cold storage, walk-in freezer room, commercial refrigeration cabinet, food quick-freezing workshop, fruit and vegetable fresh-keeping cold room, seafood preservation warehouse, industrial low-temperature cooling system and other refrigeration projects. Cold room is the most common application scenario: the compressor works as the core power component of refrigeration system, compresses refrigerant gas and drives refrigerant circulation to realize heat exchange and maintain stable low temperature inside cold storage. For food industry, it is used for meat, seafood, dairy product freezing and preservation, strict temperature control can keep food fresh and extend storage period. For fruit and vegetable preservation cold room, the compressor runs continuously under medium temperature condition to control humidity and temperature and slow down food ripening. It also fits for supermarket commercial freezer, beverage refrigeration equipment and pharmaceutical cold storage which needs strict temperature control. Different application scenarios have different working condition requirements. Low-temperature quick-freezing project requires compressor to run stably under ultra-low evaporation temperature; fruit fresh-keeping cold room focuses on stable medium temperature operation and energy saving. Our technical team can provide professional model selection suggestion according to your specific application field, cold room size, target temperature and local ambient temperature. We can also share reference project cases of similar cold room projects for your engineering design. If you are a refrigeration system integrator or cold room engineering contractor, we can provide technical support for your whole refrigeration system design, help you match evaporator, condenser and other auxiliary parts together with our compressor.

A: We provide a wide range of standard Sitolid refrigeration compressor models for cold storage, walk-in freezer, commercial refrigeration and industrial cooling systems, and customized specifications are also acceptable. Our standard product portfolio covers different displacement, cooling capacity, voltage and refrigerant types, including medium temperature and low temperature compressor models, which can match different size cold room projects, from small commercial cold storage to large industrial refrigeration projects. Different models have different cooling capacity, power consumption and working temperature range. Our technical team can help customers select the most suitable compressor model according to cold room volume, required temperature, ambient temperature and refrigerant type. If our standard models cannot fully meet your project requirement, we can customize compressor parameters, connection interface, voltage specification and other technical indexes. Before customization, our engineers will evaluate your technical requirements, check feasibility and calculate cooling performance, then provide technical drawing and quotation. For customized compressor, we will make prototype sample first for performance test, after passing the test, we can start mass production. All customized compressors will keep the same quality control standard as standard products. We can provide complete product catalog, parameter sheet, performance curve and installation manual for all models for your engineering design and equipment matching. When selecting compressor model, many buyers only focus on horsepower, but cooling capacity, evaporation temperature and condensing temperature are more critical indexes. Our technical support team can provide professional model selection suggestion to avoid wrong model selection and system failure after installation.

A: Sitolid refrigeration compressor adopts high-grade nodular cast iron for compressor housing, high purity enameled copper wire for motor winding, high precision alloy bearing and special refrigerant-resistant sealing components. All raw materials are strictly inspected before entering workshop, so the compressor owns stable mechanical performance and long service life under continuous working condition. Nodular cast iron shell has excellent compressive strength, vibration resistance and shock resistance, which can reduce running noise and resist pressure fluctuation inside compressor during long-time operation. High purity copper winding greatly improves motor heat dissipation performance and reduces heating loss during continuous operation, avoiding burnout caused by overheating. The alloy bearing has low friction coefficient and strong wear resistance under high pressure and low temperature working environment. The internal sealing parts are made of special refrigerant-resistant rubber material, which can keep sealing performance for different refrigerants and prevent refrigerant leakage. We support material inspection for customers. If you need material test report of raw material composition, we can provide third-party material analysis report. Different working conditions will put different requirements on material performance, such as high humidity, corrosive ambient environment or ultra-low temperature cold storage project. Our technical team can recommend suitable material solution according to your actual application environment. Poor quality compressors often use recycled scrap iron and low purity copper wire, which easily cause refrigerant leakage, motor overheating, excessive noise and short service life. Our strict raw material selection standard guarantees stable compressor performance for cold room, commercial freezer and industrial refrigeration system. We can also adjust partial material configuration for customized compressor models according to special project requirements.