for Commercial Boiler Applications

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The Burnham Commercial RTC Return Temperature Control provides an economical and effective means of boilerprotection 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 effi-ciency and reduces operating costs. The controls is available in two configurations: Basic RTC Kit and RTC kit with Outdoor Reset Control.

Return SensorMonitors Boiler Return Water Temperature

RTCReturn Temperature Control

Includes: Outdoor Reset option LCD display of return water temperature

3-way Diverting

ValveBoiler

Circulator

MaintainsMinimum 135°F

Return Water Temperature

1

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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 TemperaturesThe 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.

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

RTC RETURN TEMPERATURE CONTROL

Basic RTC Kit 3 x 1� Nipple with Tapping �4 Vac Actuator 3-way ValveJ-BoxMounting Bracket

Standard Equipment

RTC Kit with Outdoor ResetBasic RTC Kit with additional items below:

917-14 Universal Sensor for Mixing070 Outdoor Sensor

Additional Components Boiler Circulator one required per RTC kit (not included) Flange Kits for 3-way valves available in �-1/�” to 5” sizes

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 OptionThe 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 heat-ing 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

• �4 Vac Floating Motor Actuator on 3-way Valve

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RTC Kit Selection Chart (1)

SELECT BOILER SIZE BASED ON ∆ T (4) VALVE SIZE

(1) (2)

BASIC RTC KITPART #

RTC KIT w/OUTDOOR RESET

PART #

APPROXIMATESHIPPING WEIGHT20° ∆ T 40° ∆ T

— V903 1.0 NPT" 60160851 60160861 17

— V904 1.�5 NPT" 6016085� 6016086� 17

V903V904

V905, V906V1104, V1105

1.5 NPT" 60160853 60160863 �0

V905V1104

V907, V908, V909V1106, V1107, V1108

�.0 NPT" 60160854 60160864 �4

V906, V907, V908V1105, V1106

V910, V911, V91�V1109, V1110, V1111

�.5" FLG (3) 60160855 60160865 47

V909, V910, V911V1107, V1108, V1109

V111�, V1113, V1114V1115, V1116, V1117

�.5" FLG (3) 60160856 60160866 47

V91�V1110, V1111, V111�, V1113

V1118 V1119, V11�0V11�1, V11��, V11�3

3.0" FLG 60160857 60160867 55

V1114, V1115V1116, V1117, V1118

— 4.0" FLG 60160858 60160868 80

V1119, V11�0V11�1, V11��, V11�3

— 5.0" FLG 60160859 60160869 93

1. Requires addition of a boiler circulator, to be provided by installer. See back page for circulator selection. 2. Pipe size varies on application – Refer to I & O Manual for details. 3. The 2.5” valves have diferent Cv values. Refer to the I & O Manual for details.4. RTC can be used on other Burnham Commercial products. Consult factory for application.

RTC Return Temperature Control Specification1. The Burnham RTC Return Temperature Control is a CSA certified microprocessor based control that will control boiler return water temperature to prevent thermal shock and flue gas condensation.

�. The control shall have a 1�0V power supply with a built in �4V transformer to power a floating action type actuator.

3. The control shall provide a �4V floating output signal to modulate a three-way or a four-way diverting valve based on a signal from the return temperature sensor mounted in the return piping to the boiler.

4. The control shall have an LCD display to view system status and operating information.

5. The control shall have a non-volatile memory to monitor supply and return water temperatures and boiler run times.

6. The control shall have a boiler minimum setting of 135°F and shall not be programmable any lower than 135°F.

7. The control shall have a warm weather shut down feature, a heat demand input, boiler contact and pump contact.

8. The control must receive a heat demand before it can operate. When the demand is removed, the diverting valve shall fully close before it is allowed to respond to the new heat demand.

9. The control shall have a test sequence to ensure proper component operation, an adjustable pump post purge of zero to �40 seconds, exercising of pump and diverting valve, error messages when it detects a malfunction and an adjustable actuator motor speed setting of 30 to �30 seconds.

10. The control shall have the ability to operate with an outdoor reset function. This requires the use of a mixed water sensor and an outdoor air sensor.

20° ∆ T Circulator Sizing (1)

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©�011 Burnham Commercial - Lancaster, PA�

www.burnhamcommercialcastiron.comForm No. PL81465701000-9/07-5Ms Printed in the U.S.A.

BOILER SIZE

TOTALGPM

TACO (1) BELL & GOSSETT (1) GRUNDFOS (1) ARMSTRONG (1)

MODEL # IMP " HP RPM MODEL # IMP " HP RPM MODEL # IMP " HP RPM MODEL # IMP " HP RPMV903AV904AV905AV906AV907AV908A V909AV910AV911AV91�A

3548658196111134153171190

IL 11116151611

KV�00616351635

KV3006KV3006KV3006KV3007

N/A4.74.54.34.54.94.75.05.35.6

1/81/31/31

1/�3/41111

17�5175017501750175017501750175017501750

PL-36-1.5"PL-75-�"

PL-130-�"PL-130-�"PL-130-�"

Ser. 60, Mod. 610-�Ser. 60, Mod. 610-�

Ser. 80, Mod. 3x3x7BSer. 80, Mod. 3x3x7BSer. 80, Mod. 3x3x7B

Std.Std.Std.Std.Std.44555

1/61/6�/5�/5�/51/�1/�111

330034003�003�003�0017501750175017501750

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11

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PL-130-�"PL-130-�"

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Std.Std.4455

5.55.55.�55.3755.�55.5

�/5�/51/�1/�11

3/43/43/43/43/41

3�003�001750175017501750115011501150115011501150

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3.8754.5�95.4185.0574.9835.014.91

5.1495.785.96

7.03

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1-1/�1-1/�1-1/�

11601160116011601160

Ser. 80, Mod. 5x5x7Ser. 80, Mod. 5x5x7Ser. 80, Mod. 5x5x7Ser. 80, Mod. 5x5x7Ser. 80, Mod. 5x5x7

5.55.5

5.8756

6.5

11

1.51.51.5

11501150115011501150

—————

—————

—————

—————

4380 6x6x84380 6x6x84380 6x6x84380 6x6x84380 6x6x8

5.66�5.7�5.7745.8115.16

1.51.51.51.51.0

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417433455

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6.55.6�5

6

1.51

1.5

115011501150

———

———

———

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5.3195.3

6.56

1.01.01.0

1�001�001�00

1. For any motor over 1/3 hp, use additional relay for single phase power. Use motor starter for 3 phase power.

BOILER SIZE

TOTALGPM

TACO (1) BELL & GOSSETT (1) GRUNDFOS (1) ARMSTRONG (1)

MODEL # IMP " HP RPM MODEL # IMP " HP RPM MODEL # IMP " HP RPM MODEL # IMP " HP RPMV903AV904AV905AV906AV907AV908A V909AV910AV911AV91�A

17�43�40485667768695

0070010111C1�1C1�0C16111��C1�1C131

1635

N/AN/AN/AN/AN/A4.1N/AN/AN/A4.5

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NRF-33PL-36PL-36PL-45PL-75PL-75

PL-130-�"PL-130-�"PL-130-�"PL-130-�"

Std.Std.Std.Std.Std.Std.Std.Std.Std.Std.

1/51/61/61/61/61/6�/5�/5�/5�/5

�950330033003300340034003�003�003�003�00

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3.393.393.39�.5��.5�4.864.864.864.864.97

1/31/31/31/�1/�1/�1/�1/�1/�3/4

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S-�5S-�5E-8S-35S-46S-45S-46

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�.75�.75Full

3.3753.3753.8753.8754.9984.6675.019

1/61/1�1/61/61/41/41/31/31/31/3

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334353647686971081171�5137148156168179187198�09�17��8

1111�01�01�11311�1

16351635163516351635

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N/AN/AN/AN/AN/AN/A4.54.84.95.�5.54.95.15.95.65.65.75.96.16.3

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PL-130-�"PL-130-�"PL-130-�"PL-130-�"

Ser. 60, Mod. 610-�Ser. 60, Mod. 610-�Ser. 60, Mod. 610-�

Ser. 80, Mod. 3x3x7BSer. 80, Mod. 3x3x7BSer. 80, Mod. 3x3x7BSer. 80, Mod. 3x3x7BSer. 80, Mod. 3x3x7BSer. 80, Mod. 3x3x7BSer. 80, Mod. 3x3x7BSer. 80, Mod. 3x3x7BSer. 80, Mod. 3x3x7BSer. 80, Mod. 3x3x7B

Std.Std.Std.Std.Std.Std.Std.4445555555

5.55.55.5

1/61/61/6�/5�/5�/5�/51/�1/�1/�1111111

1-1/�1-1/�1-1/�

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Full3.3753.8753.8754.�54.�55.1475.5795.1195.0

4.5694.9�5.1685.5�04.6544.8085.035.�16.195.5�0

1/61/61/41/41/31/31/31/�1/31/31/31/�1/�3/41/31/31/�1/�1/�3/4

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40° ∆ T Circulator Sizing (1)

1. For any motor over 1/3 hp, use additional relay for single phase power. Use motor starter for 3 phase power.

Phone: 1-888-791-3790

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