Burnham RTC Brochure
for Commercial Boiler Applications
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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.
3-way
Diverting
Valve
Boiler
Circulator
RTC
Return Temperature Control
Includes:
Outdoor Reset option
LCD display of return
water temperature
Return Sensor
Monitors Boiler Return
Water Temperature
Maintains
Minimum 135°F
Return Water
Temperature
1
RTC RETURN TEMPERATURE CONTROL
Why Boiler Protection?
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.
Outdoor Reset Option
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.
Features Include:
• 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
Standard Equipment
Basic RTC Kit
3 x 12 Nipple with Tapping
24 Vac Actuator
3-way Valve
J-Box
Mounting Bracket
RTC Kit with Outdoor Reset
Basic RTC Kit with additional
items below:
917-14 Universal Sensor for Mixing
070 Outdoor Sensor
2
Additional Components
Boiler Circulator
one required per RTC kit
(not included)
Flange Kits for 3-way valves
available in 2-1/2” to 5” sizes
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