Return Temperature Stabilizer

RTS FEATURES• Improved casting flow• Eliminates hot spots• Integral solution• Non-mechanical (No

added pumps, valves, orcontrols)

• No adjustments or settings• No increased pump head

loss• Easy to install• No maintenance

“Boiler Thermal Shock” can be loosely definedas a sudden thermal change that occurs withinthe boiler causing rapid and uneven expansionand contraction of a boiler’s structure. Theproblem of thermally induced stress has beenapparent for many years, particularly in hotwater heating systems. Several conditions cancontribute to boiler stress and reduced lifeexpectancy. In recent years the problem hasbecome more common as energy saving meas-ures have been increased. All involve introducingexcessively low temperature water or cool waterat high flow rates into a hot boiler. The term“shock” suggests a sudden impact type failure,which in the vast majority of cases is far fromwhat actually happens. Most failures of this typeoccur over a period of time, sometimes material-izing within as short a time frame as a fewweeks, but often a considerably longer time period ensues before damage is detected. BoilerThermal Shock was the challenge until now.

THE SOLUTION

Return Temperature Stabilizer is nowstandard equipment on all Smith 28 and28HE (900 – 4629MBH) water boilers.Smith has developed this integral systemthat evenly distributes return water

Return Temperature Stabilizer

throughout all the boiler sections. RTSpromotes flow and temperature equaliza-tion that results in minimal temperaturedifferentials, effectively eliminating widetemperature variations that are associatedwith thermal shock and decreased boilerlife. RTS is an integral component withno moving parts and will not interferewith prioritized building managementcontrol systems.

Modular Slide in Installation

Low Delta T

R E T U R N T E M P E R A T U R E S T A B I L I Z E R

A MESTEK COMPANY

SmithCAST IRON BOILERS

Westcast, Inc., 260 North Elm Street, Westfield, MA 01085(413) 562-9631 • FAX: (413) 562-3799

www.smithboiler.com

BASIC GUIDELINES WOULD BE:RTS efficiently protects from thermal shock, however the boiler cannot be operated as a condensing boiler.

Correct position assured with alignment tab. A removable elbow or section of pipe must be attachedto the back section return port to allow for RTSremoval should removal be required.

1. The boiler shall reach and maintain a minimumoutlet water temperature of 140˚ F within 10 minutesof burner operation.

Typical piping arrangement

RTSB-1

2. For low water temperature hydronic systems such aswater source heat pumps and snow melt, the minimumoutlet water temperature shall reach and maintain 160˚ Fwithin 10 minutes of burner operation.

SIOM-100