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
ww w.c om me rc ia lc as ti ro n. co m
RTC Kit Selection Chart
SELECT BOILER SIZE BASED ON ∆ T
(1)
(4)
VALVE
SIZE
(1) (2)
BASIC
RTC KIT
PART #
— V903 1.0 NPT" 60160851 60160861 17
— V904 1.25 NPT" 60160852 60160862 17
V903
V904
V905
V1104
V906, V907, V908
V1105, V1106
V909, V910, V911
V1107, V1108, V1109
V912
V1110, V1111, V1112, V1113
V1114, V1115
V1116, V1117, V1118
V1119, V1120
V1121, V1122, V1123
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.
V905, V906
V1104, V1105
V907, V908, V909
V1106, V1107, V1108
V910, V911, V912
V1109, V1110, V1111
V1112, V1113, V1114
V1115, V1116, V1117
V1118 V1119, V1120
V1121, V1122, V1123
— 4.0" FLG 60160858 60160868 80
— 5.0" FLG 60160859 60160869 93
1.5 NPT" 60160853 60160863 20
2.0 NPT" 60160854 60160864 24
2.5" FLG
2.5" FLG
(3)
60160855 60160865 47
(3)
60160856 60160866 47
3.0" FLG 60160857 60160867 55
RTC KIT w/
OUTDOOR RESET
PART #
APPROXIMATE
SHIPPING
WEIGHT20° ∆ T 40° ∆ T
RTC Return Temperature Control Specification
1. 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.
2. The control shall have a 120V power supply with a built in 24V transformer to power a floating action type actuator.
3. The control shall provide a 24V 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
240 seconds, exercising of pump and diverting valve, error messages when it detects a malfunction and an adjustable
actuator motor speed setting of 30 to 230 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.
3
ww w.c om me rc ia lc as ti ro n. co m
1/8
1/3
1/3
1/2
3/4
3/4
(1)
Std.
Std.
Std.
Std.
Std.
4
4
5
5
5
Std.
Std.
4
4
5
5
5.5
5.5
5.25
5.375
5.25
5.5
5.5
5.5
5.875
6
6.5
6.5
5.625
6
(1)
1/6
3300
1/6
3400
2/5
3200
2/5
3200
2/5
3200
1/2
1750
1/2
1750
1
1750
1
1750
1
1750
2/5
3200
2/5
3200
1/2
1750
1/2
1750
1
1750
1
1750
3/4
1150
3/4
1150
3/4
1150
3/4
1150
3/4
1150
1
1150
1
1150
1
1150
1.5
1150
1.5
1150
1.5
1150
1.5
1150
1
1150
1.5
1150
BELL & GOSSETT
1725
1750
1750
1
1750
1750
1750
1
1750
1
1750
1
1750
1
1750
1
1750
1
1750
1750
1
1750
1
1750
1
1150
1
1150
1
1150
1
1150
1
1160
1
1160
1
1160
1
1160
1
1160
1160
1160
1160
1160
2
1160
2
1160
PL-36-1.5"
PL-75-2"
PL-130-2"
PL-130-2"
PL-130-2"
Ser. 60, Mod. 610-2
Ser. 60, Mod. 610-2
Ser. 80, Mod. 3x3x7B
Ser. 80, Mod. 3x3x7B
Ser. 80, Mod. 3x3x7B
PL-130-2"
PL-130-2"
Ser. 60, Mod. 610-2
Ser. 60, Mod. 610-2
Ser. 80, Mod. 3x3x7B
Ser. 80, Mod. 3x3x7B
Ser. 80, Mod. 4x4x7
Ser. 80, Mod. 4x4x7
Ser. 80, Mod. 5x5x7
Ser. 80, Mod. 5x5x7
Ser. 80, Mod. 5x5x7
Ser. 80, Mod. 5x5x7
Ser. 80, Mod. 5x5x7
Ser. 80, Mod. 5x5x7
Ser. 80, Mod. 5x5x7
Ser. 80, Mod. 5x5x7
Ser. 80, Mod. 5x5x7
Ser. 80, Mod. 5x5x7
Ser. 80, Mod. 6x6x7
Ser. 80, Mod. 6x6x7
20° ∆ T Circulator Sizing
(1)
BOILER
SIZE
V903A
V904A
V905A
V906A
V907A
V908A
V909A
V910A
V911A
V912A
V1104
V1105
V1106
V1107
V1108
V1109
V1110
V1111
V1112
V1113
V1114
V1115
V1116
V1117
V1118
V1119
V1120
V1121
V1122
V1123
TOTAL
GPM
MODEL # IMP " HP RPM MODEL # IMP " HP RPM MODEL # IMP " HP RPM MODEL # IMP " HP RPM
35
IL 111
48
1615
65
1611
81
KV2006
96
111
134
153
171
190
107
128
152
173
194
215
233
250
273
296
313
335
358
374
396
417
433
455
1635
1635
KV3006
KV3006
KV3006
KV3007
67
KV2606
86
KV2006
1635
KV3006
KV3006
KV3007
KV3007
KV3007
KV3007
KV4007
KV4007
KV5007
KV5007
KV5007
KV5007
C13009
C13009
C14007
C14007
C14007
TACO
N/A
4.7
4.5
4.3
4.5
4.9
4.7
5.0
5.3
5.6
4.7
4.5
4.8
4.4
5.0
5.5
5.5
6.0
6.2
5.6
5.8
5.7
5.5
5.8
5.9
6.3
6.5
6.6
6.7
6.9
1-1/2
1-1/2
1-1/2
1-1/2
1. For any motor over 1/3 hp, use additional relay for single phase power. Use motor starter for 3 phase power.
1/25
1/8
1/8
1/7
1/6
1/4
1/4
1/4
1/3
1/2
1/8
1/6
1/6
1/4
1/3
1/4
1/2
3/4
3/4
3/4
1
1
1
1
1
1
1
1
1
1
3250
3250
1725
1725
1725
1750
1725
1725
1725
1750
1725
1725
1725
1725
1725
1725
1750
1750
1750
1750
1750
1750
1750
1160
1160
1160
1160
1160
1160
1160
(1)
BELL & GOSSETT
NRF-33
PL-36
PL-36
PL-45
PL-75
PL-75
PL-130-2"
PL-130-2"
PL-130-2"
PL-130-2"
PL-1361-1/2"
PL-75
PL-75
PL-130-2"
PL-130-2"
PL-130-2"
PL-130-2"
Ser. 60, Mod. 610-2
Ser. 60, Mod. 610-2
Ser. 60, Mod. 610-2
Ser. 80, Mod. 3x3x7B
Ser. 80, Mod. 3x3x7B
Ser. 80, Mod. 3x3x7B
Ser. 80, Mod. 3x3x7B
Ser. 80, Mod. 3x3x7B
Ser. 80, Mod. 3x3x7B
Ser. 80, Mod. 3x3x7B
Ser. 80, Mod. 3x3x7B
Ser. 80, Mod. 3x3x7B
Ser. 80, Mod. 3x3x7B
Std.
Std.
Std.
Std.
Std.
Std.
Std.
Std.
Std.
Std.
Std.
Std.
Std.
Std.
Std.
Std.
Std.
5.5
5.5
5.5
(1)
1/5
2950
1/6
3300
1/6
3300
1/6
3300
1/6
3400
1/6
3400
2/5
3200
2/5
3200
2/5
3200
2/5
3200
1/6
3300
1/6
3400
1/6
3400
2/5
3200
2/5
3200
2/5
3200
2/5
1/2
1/2
1/2
1
1
1
1
1
1
1
1-1/2
1-1/2
1-1/2
3200
1750
1750
1750
1750
1750
1750
1750
1750
1750
1750
1750
1750
1750
4
4
4
5
5
5
5
5
5
5
40° ∆ T Circulator Sizing
(1)
BOILER
SIZE
V903A
V904A
V905A
V906A
V907A
V908A
V909A
V910A
V911A
V912A
V1104
V1105
V1106
V1107
V1108
V1109
V1110
V1111
V1112
V1113
V1114
V1115
V1116
V1117
V1118
V1119
V1120
V1121
V1122
V1123
TOTAL
GPM
MODEL # IMP " HP RPM MODEL # IMP " HP RPM MODEL # IMP " HP RPM MODEL # IMP " HP RPM
17
24
32
40
48
56
67
76
86
95
33
43
53
64
76
86
97
108
117
125
137
148
156
168
179
187
198
209
217
228
007
0010
111C
121C
120C
1611
122C
121C
131
1635
111
120
120
121
131
121
1635
1635
1635
1635
1635
KV3006
KV3006
KV3007
KV3007
KV3007
KV3007
KV3007
KV3007
KV3007
TACO
N/A
N/A
N/A
N/A
N/A
4.1
N/A
N/A
N/A
4.5
N/A
N/A
N/A
N/A
N/A
N/A
4.5
4.8
4.9
5.2
5.5
4.9
5.1
5.9
5.6
5.6
5.7
5.9
6.1
6.3
1. For any motor over 1/3 hp, use additional relay for single phase power. Use motor starter for 3 phase power.
UPS32-40/4
UPS32-80/4
UPS40-80/4
UPS40-80/4
UPS50-80/4
UPS50-80/2
TP80-40/4
TP100-40/4
TP100-40/4
TP100-80/4
UPS40-80/4
UPS40-80/4
UPS50-80/4
UPS50-80/2
TP100-40/4
TP100-40/4
—
—
—
UPS80-160/2
—
—
—
—
—
—
—
—
—
—
UPS32-40/4
UPS32-40/4
UPS32-40/4
UPS32-80/2
UPS32-80/2
UPS40-80/4
UPS40-80/4
UPS40-80/4
UPS40-80/4
UPS50-80/4
UPS32-40/4
UPS32-80/2
UPS32-80/2
UPS40-80/4
UPS40-80/4
UPS40-80/4
UPS50-80/4
UPS50-80/4
UPS50-80/4
UPS50-80/4
UPS50-80/4
UPS50-160/2
UPS50-160/2
UPS50-160/2
UPS100-40/4
UPS100-40/4
UPS100-40/4
UPS80-160/2
UPS80-160/2
UPS80-160/2
GRUNDFOS
3.39
2.52
4.86
4.86
4.97
2.91
3.73
4.10
4.10
5.24
4.86
4.86
4.97
2.91
4.1
4.1
—
—
—
3.56
—
—
—
—
—
—
—
—
—
—
GRUNDFOS
3.39
3.39
3.39
2.52
2.52
4.86
4.86
4.86
4.86
4.97
3.39
2.52
2.52
4.86
4.86
4.86
4.97
4.97
4.97
4.97
5.03
4.1
3.57
3.57
3.57
3.57
3.57
3.57
3.57
3.57
(1)
1/3
1667
1/2
3400
1/2
1587
1/2
1587
3/4
1607
3/4
3426
1/2
1750
1
1750
1
1750
2
1750
1/2
1587
1/2
1688
3/4
1694
3/4
3426
1
1750
1
1750
—
—
—
—
—
—
3
3513
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
(1)
1/3
1594
1/3
1667
1/3
1712
1/2
3400
1/2
3400
1/2
1450
1/2
1587
1/2
1587
1/2
1688
3/4
1607
1/3
1667
1/2
3281
1/2
3400
1/2
1587
1/2
1688
1/2
1688
3/4
1694
3/4
1694
3/4
1607
3/4
1694
1/2
1694
1
3395
3
3395
3
3513
3
1712
3
1712
3
1712
3
3513
3
3513
3
3513
E-10
E-16
S-46
S-46
4380 3x3x6
4380 3x3x6
4380 3x3x6
4380 4x4x6
4380 4x4x6
4380 4x4x6
S-45
4380
4380 3x3x6
4380 3x3x6
4380 4x4x6
4380 4x4x6
4380 4x4x6
4380 4x4x6
4380 4x4x6
4380 4x4x6
4380 4x4x6
4380 5x5x8
4380 6x6x8
4380 6x6x8
4380 6x6x8
4380 6x6x8
4380 6x6x8
4380 6x6x8
4380 6x6x8
4380 6x6x8
S-25
S-25
E-8
S-35
S-46
S-45
S-46
4380 3x3x6
4380 3x3x6
4380 3x3x6
E-8
S-35
S-45
S-45
S-46
S-46
4380 3x3x6
4380 3x3x6
4380 3x3x6
4380 3x3x6
4380 4x4x6
4380 4x4x6
4380 4x4x6
4380 4x4x6
4380 4x4x6
4380 4x4x6
4380 4x4x6
4380 4x4x6
4380 4x4x6
4380 4x4x6
ARMSTRONG
ARMSTRONG
Full
Full
4.25
4.25
5.04
5.567
5.23
4.971
5.371
4.891
3.875
4.529
5.418
5.057
4.983
5.01
4.91
5.149
5.78
5.9
6
7.03
5.662
5.72
5.774
5.811
5.16
5.319
5.3
6.56
2.75
2.75
Full
3.375
3.375
3.875
3.875
4.998
4.667
5.019
Full
3.375
3.875
3.875
4.25
4.25
5.147
5.579
5.119
5.0
4.569
4.92
5.168
5.520
4.654
4.808
5.03
5.21
6.19
5.520
(1)
1/6
1/6
1/3
1/3
1/3
1/2
1/3
1/2
1/2
1/2
1/4
1/3
1/2
1/3
1/2
1/2
1/2
1/2
3/4
3/4
3/4
1.5
1.5
1.5
1.5
1.5
1.0
1.0
1.0
1.0
(1)
1/6
1/12
1/6
1/6
1/4
1/4
1/3
1/3
1/3
1/3
1/6
1/6
1/4
1/4
1/3
1/3
1/3
1/2
1/3
1/3
1/3
1/2
1/2
3/4
1/3
1/3
1/2
1/2
1/2
3/4
1800
1200
1200
1200
1200
1200
1200
1200
1200
1200
1800
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
1800
1800
3600
1800
1800
1800
1800
1200
1200
1200
3600
1800
1800
1800
1800
1800
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
©2011 Burnham Commercial - Lancaster, PA
Form No. PL81465701000-9/07-5Ms Printed in the U.S.A.
www.burnhamcommercialcastiron.com
Phone: 1-888-791-3790
2
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