With an externally accessible sensitivity adjusting screw

Direct Drop-In Compatibility: Engineered to replace 921047 and ZR29KC-PFV-930 units without extensive piping re-work

What is the primary application for this 750W element

and a check valve

Common Questions What is the maximum supply air pressure for the M573-5108

Lochinvar & A.O. Smith 100110204 Control Module 326010-701 With an externally accessible sensitivityWhen you're troubleshooting a Lochinvar Power Fin or 120 series boiler that refuses to initiate its sequence, the Lochinvar & A. O. Smith 100110204 Control Module is usually the first place to look. As a genuine OEM IID control module, this board manages the critical intermittent ignition device (IID) logic, supervising everything from the prepurge cycle to flame proving. It is designed to handle 24VAC control circuits, integrating seamlessly with