McDonnell & Miller 345700 Float and Gaskets

The McDonnell & Miller 345700 (Model SA91-60) is a high-precision replacement float and gasket kit engineered for heavy-duty boiler water level control. As a critical component for Series 93, 193, 94, and 194 combination pump controllers and low water cut-offs, this stainless steel float assembly ensures accurate buoyancy and reliable switch activation in high-pressure steam environments. The SA91-60 replaces legacy models including the SA92-60 and SA93-60, providing a streamlined upgrade path for older McDonnell & Miller boiler controls. Designed to withstand the thermal stress of industrial HVAC water level sensing, the kit includes the necessary flange gaskets (specifically the 150-14 for 93/193 units and 92-68 for 94/194 units) to ensure a high-integrity, leak-proof seal during the reassembly of the head mechanism. For contractors, this OEM kit is the standard for maintaining system reliability and preventing catastrophic dry-fire conditions in commercial boilers.

Key Benefits:

• Universal Compatibility: Direct-fit replacement for McDonnell & Miller 93, 193, 94, and 194 Series pump controllers.
• Enhanced Buoyancy: Precision-weighted stainless steel float provides consistent water level detection across varying pressure ranges.
• Complete Sealing: Includes application-specific flange gaskets to prevent steam leaks and maintain pressure vessel integrity.
• Interchangeable Design: Serves as the official successor to legacy part numbers SA93-60 and SA92-60.
• Industrial Durability: Built for the rigors of high-temperature steam applications and harsh boiler water chemistry.

Common Questions:

Which gasket should I use for a Series 194 installation?
When servicing Series 94 or 194 units, use the 92-68 flange gasket provided in the kit. The 150-14 gasket is specifically sized for the smaller flange of the 93 and 193 series.

Can I reuse my old float rod with the new SA91-60?
It is highly recommended to inspect the float arm and pivot springs. If the rod is bent or the springs are compromised, the entire head assembly may require replacement to ensure proper switch sequence.

What is the torque specification for the head bolts?
For Series 93 models, tighten bolts to 14-20 ft-lbs. For Series 94 models, tighten to 17-21 ft-lbs using an alternating star pattern to ensure even gasket compression.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.