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How to Select Air Pressure Switches by Parameters? Reference for Boiler Manufacturer Procurement | Zhongshan Optun Electric Co., Ltd.
In the assembly of heating equipment such as wall-hung boilers and forced exhaust water heaters, the air pressure switch acts as an essential safety protection component. Many equipment manufacturers and spare parts suppliers often encounter issues including pressure drift, false triggering under low temperature and insufficient service life when purchasing accessories. Proper selection of this component directly affects the operational stability of the whole unit.
Simply put, the air pressure switch works by sensing negative pressure generated by the fan. When the equipment starts, the fan runs first. Once the negative pressure inside the pipeline reaches the preset threshold, the contacts of the air pressure switch close and send signals to the main control board, allowing ignition. If the flue is blocked or the fan malfunctions and the negative pressure fails to meet the setting value, the air pressure switch will cut off the ignition circuit to prevent risks caused by flue gas backflow.
Many buyers only focus on external dimensions while overlooking core internal parameters. Air pressure switches with identical appearances may have different actuation pressure and reset differential pressure, which will trigger malfunctions after replacement or installation. During selection, the first step is to confirm the actuation pressure matching your unit; wall-hung boilers of different power ratings require different pressure parameters. The diaphragm material is another critical factor. Condensed water and trace flue gas exist during operation, and corrosion-resistant diaphragms reduce risks of aging and adhesion over long-term use.
Environmental adaptability also deserves attention during procurement. Low-temperature conditions in northern regions and humid installation environments demand better temperature resistance and moisture-proof performance for air pressure switches. Products with a narrow temperature tolerance range may suffer parameter shift in cold environments, leading to frequent fault shutdowns. Before bulk purchase, sample testing under simulated working conditions is recommended to verify actuation consistency and lower mass assembly risks.
Zhongshan Optun Electric Co., Ltd. focuses on R&D and manufacturing of HVAC spare parts and heating hosts. Air pressure switches serve as key supporting accessories for heating equipment. Every unit undergoes multiple inspections including pressure calibration, aging test and high-low temperature simulation before delivery to ensure consistent parameters within batches. Custom-spec air pressure switches can be offered based on technical requirements from equipment manufacturers, supporting small-batch sampling and large-volume OEM cooperation.
Apart from air pressure switches, Zhongshan Optun Electric Co., Ltd. also provides other spare parts for wall-hung boilers and electric heating equipment. It enables one-stop procurement for OEM factories and cuts communication costs from dealing with multiple suppliers. For customers in the R&D phase, our technical team can check pressure parameters and help match proper air pressure switch models.
For maintenance service providers, replacing air pressure switches should not rely merely on appearance matching. Prioritize checking the actuation pressure of the original part. Products with the same shape but mismatched pressure parameters still result in ignition failure and repeated error codes. When stocking spare parts, classify air pressure switches by unit model and pressure specification for fast on-site maintenance.
Stable lead time and complete documentation are important for HVAC component procurement. Zhongshan Optun Electric Co., Ltd. can provide datasheets and relevant test documents for partners to meet the requirement of whole-machine filing and inspection. Equipment manufacturers and engineering suppliers with sample or bulk purchase demands may share unit models and parameter requirements to discuss customized air pressure switch solutions.
