![]() In addition to high operating cycle gas and air solenoids, additional ratio regulators and reliable burners, a pulse controller is also needed. To achieve the correct ratio control, a ratio regulator must be installed on each burner train, along with a valve for air modulation – either an air solenoid, or a solenoid-actuated butterfly, rated for high operating cycles. The piping to your burners may change when implementing pulse-fire as well. However, if there are any burner-reliability concerns, it may be best to plan on replacing them. Many people hear about the pulse-firing method, and they want to upgrade their existing system, but don’t want to get into the cost of new burners. ![]() When talking about pulse-fire, it is often said that any burner that can handle it can be pulse-fired, but what exactly does this mean? In the case of on/off operation, it seems obvious the burner must light reliably. ![]() If valves that cannot handle these requirements are installed, they quickly fail, and the cost of constantly replacing spent solenoid valves outweighs the savings typically seen with pulse-fire. Achieving on/off or high-fire/low-fire pulsing patterns require these valves to perform several hundred-thousand cycles. In a pulse-fire system, gas and air solenoid valves are actuated open and allowed to close repeatedly. Unless there is a problem, the valves don’t need to close until the shut-down procedure is initiated. In traditional, modulating systems, gas solenoids open during start-up and remain open during furnace operation. Some of the key equipment requirements for a successful pulse-fire installation include: operating cycles in excess of one million, capability of three cycles per minute, and repeatability. Not all combustion equipment is suitable for pulse-firing. ![]()
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