Kromschroder Air/gas ratio control GIK40R02-5B 03155147

The Kromschroder GIK40R02-5B is a gas pressure regulator designed to maintain a stable 1:1 gas/air ratio in premix burners. It operates on a pressure ratio principle, with a connection type of Rp 1 1/2" internal thread and a nominal diameter of 40 mm. The regulator handles a maximum inlet pressure of 2 mbar and a pressure range of 0.002–1.19 mbar. It features zero closure for safety, inlet pressure compensation, and a compensation diaphragm, complying with EN 88 and CE standards. Suitable for natural gas, LPG, and air, it is intended for applications requiring precise gas/air ratio control.

When selecting a replacement air/gas ratio control of this type, verify the connection size and thread type (e.g., Rp 1 1/2" internal thread) to match the existing gas train. Ensure the operating pressure range and signal type (pneumatic or mechanical) are compatible with the burner's control system. The adjustment range must correspond to the burner's turn-down ratio. Installation typically occurs between the gas valve and burner head, or integrated into a gas valve block.

Common failure modes include diaphragm wear or debris in the air impulse line, leading to drift in the gas/air ratio. Symptoms may include unstable combustion, increased CO or NOx emissions, or the burner failing to maintain its set CO2 or O2 window. Check the air impulse line for blockages or moisture, and inspect the diaphragm for damage or wear.