Gas Module Boiler Automatic Control System Combustion Automatic Control System After starting the boiler, the control system sends a signal to the small flame valve, and the small flame ignites automatically. If the small flame fails to ignite (e.g., due to lack of gas or low pressure), the system automatically shuts down and reignites after 5 minutes. If the small flame ignites successfully, the system activates, and the large flame valve system begins normal operation. If the small flame extinguishes under certain circumstances, the monitor automatically shuts off the large flame within 0.2 seconds, and the small flame valve system locks itself. Natural Gas Module Boiler Temperature Safety Control System The boiler body is equipped with two systems: normal temperature control and high-limit safety control. Some models integrate both controls on the same temperature controller, while others have separate controls. Both systems can be set for high-limit safety control. If the boiler’s outlet water temperature exceeds the set normal temperature and reaches the high-limit safety temperature due to any reason, the system automatically shuts off both the large and small flame valves and locks itself. Combining gas module boilers with an automatic control system enables the system to maintain supply water temperature according to the heating curve (error ≤ 0.5°C), truly achieving "on-demand heating" and significantly reducing excessive heat loss and underheating. Single large boilers lack flexibility in load adjustment, and most rely on manual staged coarse adjustments or methods like "large/small flame" or "peak flame." During the early and late stages of the heating season, when external weather conditions change frequently and significantly, the adjustment performance of traditional boilers makes it difficult for the actual output to match the required load, often leading to underheating or overheating—commonly referred to as the "supply-demand contradiction." This not only deteriorates heating quality but also causes unnecessary excessive heat loss. According to domestic literature, the annual comprehensive load rate (including backup devices) and thermal efficiency of most domestic oil and gas heating boilers remain below 45% and 72.7%, respectively, which is highly uneconomical. However, these two indicators have not yet garnered attention from relevant experts. By advanced standards, the annual comprehensive energy utilization rate of such boiler systems is also very low. Vandelee gas module boilers are safe and reliable. In open installation, the module boiler’s water pressure system operates under constant atmospheric pressure and features multiple comprehensive safety protections: flameout protection, dry burning protection, freeze protection, low water level protection, automatic exhaust protection, overheating protection, and leakage protection. In closed installation, the sealed water circuit system operates under a pressure of 0.05–0.3 MPa. In addition to the safety protections of open installation, it also includes the following: pressure expansion protection system, low water pressure protection system, and high-pressure safety relief device.