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Burnham boiler return temperature control ( rtc )
The Burnham Commercial RTC Return Temperature Control provides an economical and effective means of boiler
protection from thermal shock and sustained condensing operation. The RTC monitors the boiler return water temperature and operates a 3-way diverting valve and boiler circulator to maintain a minimum return temperature of 135 F or greater. An outdoor reset function is also available to reset the system water temperature based on outdoor air temperature. Studies indicate that resetting the boiler and system water temperature increases efficiency and reduces operating costs. The controls is available in two configurations: Basic RTC Kit and RTC kit with Outdoor Reset Control.
Outdoor Reset option LCD display of return water temperature
Monitors Boiler Return Water Temperature
Today s demands for comfort and efficiency require greater attention to the temperature and volume of return water to the boiler. Many premature boiler failures can be traced to these two uncontrolled variables. Operating below minimum temperatures and flow rates creates thermal shock conditions and flue gas condensation issues, each of which can shorten the life expectancy of a boiler. Other factors that affect return temperature and flow include:
snow melt and radiant flooring applications
complex system integration and control
outdoor reset and warm weather shutdown
misunderstanding the protection value of primary/secondary systems
conversion of steam or gravity flow systems to pumped water systems, while retaining the original oversized distribution systems
The concept of boiler protection has existed for many years. However, the primary focus in hydronic systems is often the demand and delivery design characteristics. Frequently, little attention is given to the heat source the boiler.
Controlling Return Temperatures
The Burnham Commercial RTC Return Temperature Control provides an economical and effective means of boiler protection from thermal shock and sustained condensing operation. By expanding the "boiler envelope" to incorporate a 3-way valve and flow control system, the RTC Return Temperature Control maintains a minimum return water temperature of 135 F or greater.
The RTC system is supplied as a kit and can be incorporated into most hydronic hot water applica-tions with minimal modifications to the system design and operation. It provides a simple means for boiler protection and an opportunity to increase operational efficiency.
The addition of the outdoor reset option provides additional energy savings by modulating the system supply water temperature based upon outdoor air temperature. This allows the system to closely match the heating needs of the building regardless of weather conditions.
Indoor/Outdoor Reset Control
Thermal Shock and Flue Gas Condensation Protection
Maintains Minimum Return Water Temperature
Simple Self-Diagnostic Test Sequence with Error Messages
Adjustable Boiler Pump Purge
Off-Season Built-in Pump and Valve Exerciser
24 Vac Floating Motor Actuator on 3-way Valve
3 x 12Nipple with Tapping 24 Vac Actuator 3-way Valve
Basic RTC Kit with additional items below:
917-14 Universal Sensor for Mixing
Boiler Circulator one required per RTC kit (not included) Flange Kits for 3-way valves available in 2-1/2" to 5" sizes
