HVAC & PLUMBING TRADE TALK

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News for the Commercial, Residential and Wastewater Trade

McDonnell & Miller Launches All-New RB-24E Low Water Cut-Off

There is no better stocking stuffer than the new McDonnell & Miller GuardDog® RB-24E Low Water Cut-Off for residential hot water boilers.

The 24-volt RB-24E offers several new features:

Brass threads provide a metal-to-metal seal that ensures a leak-free installation.
Integrated wrench flats enable secure installation without damage to the housing.
McDonnell & Miller’s patented self-cleaning probe minimizes scale build-up and extends the recommended cleaning interval to 5 years.
"Plug & Play" wiring harnesses are available for most residential gas-burning boilers.

Other significant enhancements have been made to the RB-24E including:

A Push-to-Test Button allows testing of the low water cut-off circuitry for proper operation without draining the system.

Automotive grade components provide years of reliable protection against low water conditions.

Designed, built and tested at ITT’s production facility in Morton Grove, IL USA. For more information on the RB-24E low water cut-off, contact your local McDonnell & Miller Representative or visit www.mcdonnellmiller.com

Selecting the Right Low Water Cut-Off for Residential Hot Water Boilers

When it comes to probe-style low water cut-offs for residential hydronic boilers, there are many similarities but some key differences that contractors and wholesalers need to be aware of. Generally speaking, hydronic low water cut-offs fall into two categories: 1) 120VAC models, and 2) 24VAC models. Most gas-burning residential boilers can use a 24VAC model such as the McDonnell & Miller RB-24E. Oil-burners typically have a 120VAC burner circuit and require a 120VAC low water cut-off such as the McDonnell & Miller RB-122E.

McDonnell & Miller offers the industry’s most complete line of probe-style low water cut-offs for hot water boilers, including the all new RB-24E, RB-122E, PS-850, and 750 Series.

For more information on the best low water cut-offs available, contact your local McDonnell & Miller representative or visit www.mcdonnellmiller.com.

When to insulate a Steam System Condensate Return Unit

Without clearly defined specifications in literature, factory recommendations, sizing guides or in the Little Red Schoolhouse design classes, we must understand the basic problems associated with insulating condensate units. Understanding the problems associated with vacuum units, moisture, service accessibility, tagging and identification will give us the tools to better decide when to insulate. Click here to learn more about insulating condensate receiver or boiler feed unit.

Spotlight on ESP Steam Specialties

Take a closer look at ESP-PLUS Steam Specialty product selection and engineering tools.

Click here for online product selection

Click here for helpful engineering steam calculators

Bell & Gossett Domestic Pump Hoffman Specialty McDonnell & Miller