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Technical Data Manual
Model Nos. and pricing: see Price List
VITOGAS 050
Cast iron hot water heating boiler
550 to 1050 MBH / 161 to 308 kW
Vitogas 050
RS Series
Gas-/Propane-Fired Boiler
cast iron construction
atmospheric
single- or two-stage burners
Heating input: 550 to 1050 MBH
5167 455 v1.2 01/2004
161 to 308 kW
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Product Information
Vitogas 050
For commercial applications, be it new
construction or retrofit, the Vitogas 050,
RS Series is the mid-efficiency, quality
decision. The Vitogas 050 is economical in
two ways - initial investment and
operational cost.
The benefits at a glance:
H High operational reliability and a long
service life due to special high-grade gray
cast iron with lamellar graphite and
uniform heat transfer to avoid stress
fractures.
H Large diameter, stainless steel burners
provide quiet, reliable performance;
combustion efficiency of 85%.
H Optimal operation due to wide water
passageways and a wet-base, sectional
design.
H Although the heat exchanger block is fully
factory assembled, it may be shipped in
section blocks for field assembly to
accommodate tighter handling.
H Problem-free transport into
difficult-to-access boiler rooms due to cast
iron sectional design.
Heat exchanger surfaces of special
high-grade gray cast iron for high
operational reliability and a long
service life
2
5167 455 v1.2
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Technical Data
Technical data
Boiler Model Model No. RS-8 RS-11 RS-14
CSA input full load
partial load
CSA output full load
partial load
Combustion efficiency % 85 85 85
Heat exchanger surface area ft
Cast iron sections 8 11 14
Burners 7 10 13
Manifold pressure
Natural gas full load
partial load
Propane gas full load
partial load “w.c. Not available in 2-stage configuration
Max. gas supply pressure
Dimensions
Depth
Width
Height
Overall dimensions
Total depth
Total width
Total height
– Height 1 (control unit in
position for operation)
– Height 2 (control unit in
position for servicing)
Weight, boiler with insulation, lbs
burners and packaging kg
Boiler water content USG
Max. operating pressure psig
Boiler connections
Boiler supply and return
Boiler drain
Gas supply connection Ø”
Vent pipe collar Ø” inches
*1
Combustion results are based on a heating system supply temperature of 167°F / 75°C, return 140°F / 60°C.
*2
For two-stage boilers only.
*3
Partial load manifold pressure is factory preset. Any attempt to readjust in the field will render boiler warranty null and void.
*4
If the gas supply pressure is higher than the maximum permissible value, a separate field supplied gas regulator must be installed
upstream of the boiler gas train.
*1
*1
MBH
kW
*2
MBH
kW
MBH
kW
*2
MBH
kW
2
2
m
“w.c.
*3
“w.c.
“w.c.
*4
“w.c. 14 14 14
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
ltr
kPa
Ø”
550
161
372
109
468
137
316
93
99
9.2
3.5
1.3
10
34¾
883
36¼
921
53¾
1366
47
1195
36¼
921
60¼
1531
73½
1867
1280
582
20
77
60
414
800
234
541
158
680
199
460
135
141
13.1
3.5
1.3
10
34¾
883
49½
1255
53¾
1366
47
1195
49½
1255
60¼
1531
73½
1867
1709
777
28
106
60
414
2
2
(male thread)
Ø”
¾
¾
1 1¼ 1¼
(male thread)
Ø” mm
10
250
12
300
1050
308
710
208
893
261
604
177
182
16.9
3.5
1.3
10
34¾
883
62¼
1582
53¾
1366
47
1195
62½
1588
60¼
1531
73½
1867
2138
972
35
134
60
414
14
350
2
¾
"
For information regarding other Viessmann System Technology componentry, please reference documentation of the respective product.
5167 455 v1.2
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Technical Data
FGC
Height 2
Height
Height 1
Legend
BD Boiler Drain
BWR Boiler Water Return
BWS Boiler Water Supply
FGC Flue Gas Collar
GC1 Main Gas Connection
GC2 Pilot Gas Connection
PC Pilot Cover Plate
PRV Pressure Relief Valve Connection
PRV
PC
BD
Total width
BWS
GC2
GC1
BWR
15¾”/400 mm
Depth
Total depth
4½”
110 mm
52½” / 1335 mm
50½” / 1284 mm
32½” / 830 mm
19” / 481 mm
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5167 455 v1.2
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Technical Data
Standard Equipment / Boiler Control Alternatives
Recommended Minimum Service Clearances Minimum Clearances to Combustibles
min.
24”
610 mm
min.
24”
610 mm
Installation
Never install the boiler in a confined space
with only the minimum service clearances
on all sides as above.
Top clearance:
min.
48”
1220 mm
min.
48”
1220 mm
min.
24”
610 mm
Top Rear Left Right Floor
18” 6” 6” 6” Non-combustible
Never install the boiler on combustible
flooring.
Standard Equipment
Note:
Boiler controls and burners are purchased
separately. Please see Price List for details.
The cast iron sections can be shipped as one
block or split as requested by the customer
and are shipped together with
1- carton with boiler jacketry, burner tray,
--and mid panel with electronic componentry
1- carton with draft hood
1- set of boiler ID hardware (coding card and
--technical literature)
1- carton of installation fittings (50 psig
--pressure relief valve, air vent, pressure
--gage, drain valve, and installation fittings)
1- cleaning brush
1- carton with boiler control unit
Boiler Control Alternatives
Vitotronic 100, KK10
enhanced boiler control
for high temperature heating systems
Vitotronic 100, KW10
enhanced boiler control
for modulating temperature heating systems
with indoor/outdoor system control
Vitotronic 200, KW2
for multiple temperature heating systems
with or without a mixing valve
with indoor/outdoor digital boiler and heating
system control
Vitotronic 300, KW3
for multiple temperature heating systems
with two mixing valves
with indoor/outdoor digital boiler and heating
system control
5167 455 v1.2
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System Design Considerations
System Design Considerations
The Vitogas 050 is designed for closed loop,
forced circulation hot water heating systems
only.
Boiler selection
The boiler model size should be based on an
accurate heat loss calculation of the
building. The boiler selected must be
compatible with the connected radiation.
Vent damper or wall vent system
Wherever possible, vertically vent the boiler
with a properly sized chimney which meets
all local and national codes. See section
entitled “Chimney”.
Viessmann strongly recommends the
purchase of a vent damper to reduce
standby losses, improve seasonal efficiency,
and thereby preserve our environment.
If chimney venting is not possible, order a
wall vent system from Viessmann and do
not order a vent damper.
Water quality
Treatment for boiler feed water should be
considered in areas of known problems,
such as where a high mineral content and
hardness exist. In areas where freezing
might occur, an antifreeze may be added to
the system water to protect the system.
Please adhere to the specifications given by
the antifreeze manufacturer. Do not use
automotive silicate based antifreeze. Please
observe that an antifreeze/water mixture
may require a backflow preventer within the
automatic water feed and influence
components such as diaphragm expansion
tanks, radiation, etc. A 40% antifreeze
content will provide freeze-up protection to
-10°F / -23°C. Do not use antifreeze other
than specifically made for hot water heating
systems. System also may contain
components which might be negatively
affected by antifreeze. Check total system
frequently when filled with antifreeze.
Advise system operator/ultimate owner that
system is filled with a glycol mix.
The heating contractor must provide an
MSDS (Material Safety Data Sheet) for the
antifreeze used to the system
operator/ultimate owner.
6
Chimney
For proper operation of the Vitogas boiler, all
products of combustion must be safely
vented to the outdoors, while ensuring that
flue gases do not cool prematurely.
It is critical that the chimney system be
properly designed and sized to handle the
relatively cool flue gas temperatures which
the Vitogas boiler produces.
Flue gases which cool too quickly and
produce condensation lead to damages if
the chimney diameter is too large and the
chimney system is not well insulated.
If a calculated chimney diameter lies
between two values, the larger diameter
should be selected.
Intermediate vent section
The intermediate (vertical and horizontal)
section of venting between the boiler vent
pipe collar and the chimney must be of the
identical diameter as the vent connection of
the boiler. Use the shortest possible path
between the boiler and the chimney. A
maximum of two elbows may be installed in
the intermediate section. Avoid the use of
two level 90° elbows.
The intermediate section must be sealed
pressure tight at the boiler vent pipe collar
and at the chimney connection. Ensure any
test port for combustion values is sealed as
well.
The chimney connection length between the
boiler vent pipe collar and the chimney must
be installed with insulation. We recommend
consulting a reputable chimney installer for
advice in project-specific circumstances.
Oxygen diffusion barrier
underfloor tubing
The boiler warranty does not cover leaks
resulting from corrosion caused by the use
of underfloor plastic tubing without an
oxygen diffusion barrier. Such systems must
have the non-oxygen diffusion barrier tubing
separated from the boiler with a heat
exchanger. Viessmann recommends the use
of underfloor plastic tubing with an oxygen
diffusion barrier.
Low water cut-off
A low water cut-off may be required by local
codes. If boiler is installed above the
radiation level, a low water cut-off device of
approved type must be installed in all
instances. An approved type low water
cut-off device must be provided by the
heating contractor. Do not install an
isolation valve between the boiler and the
low water cut-off.
Combustion air supply
The boiler must not be located in areas or
rooms where chemicals containing chlorine,
bromine, fluorine, or other corrosive
chemicals are stored. Examples include
refrigerants, bleach, paint, paint thinner, hair
spray, cleaning solvents, water softener
salt, etc. The combustion air must not be
contaminated with the above mentioned, or
other aggressive or corrosive chemicals.
Boiler should never be installed in areas
where excessive dust, high humidity, or risk
of frost exist. Ensure adequate ventilation
and supply of fresh combustion air.
Consult Viessmann with uncertainties in
regard to a suitable boiler installation
location.
This boiler/burner unit needs clean fresh air
for safe operation and must be installed so
that there are provisions for adequate
combustion and ventilation air. For natural
gas or propane, use the “Natural Gas
Installation Code CAN/CSA-B149.1 or
B149.2” (Canada), or “National Fuel Gas
Code ANSI Z223.1” (USA), and/or
provisions of local codes.
The sizing methods outlined in the above
codes must be used when installing a round
duct to supply combustion air from the
outside. Observe local jurisdictional
requirements.
System layout
The boiler water temperature limit is factory
set to 167°F / 75°C.
The boiler water temperature limit can be
increased by altering the adjustable high
limit to increase the supply water
temperature.
To minimize piping losses of the system
however, we recommend that the radiation
and domestic hot water production in the
system be designed for a 158°F / 70°C
boiler supply water temperature (new
systems).
Warranty excerpts
Our warranty does not cover damages
resulting from the following:
– installation or service by unqualified and
not licensed personnel
– corrosion caused by flue gas condensation
due to low boiler water and/or return
water temperatures
– operation with contaminated fill and
supplementary feed water
For detailed warranty information, please
read warranty sheet supplied with product.
5167 455 v1.2
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Installation Examples
Installation Examples
Important!
These examples depict possible piping layouts for Viessmann product equipped with Viessmann System Technology. For boiler and tank
combinations, please install only the feasible combinations listed in the Price List.
These are simplified conceptual drawings only! Piping and necessary componentry must be field verified.
Proper installation and functionality in the field is the responsibility of the heating contractor.
Without a mixing valve
with Vitotronic 100
Model KK10 or KW10 control
Heating circuit
Spring-loaded flow check valve
Circulation pump
Pressure relief valve
Precharged expansion tank
Gas connection
The installation of the check valve to restrict
gravity circulation in the heating supply pipe
prevents uncontrolled heat flow to the heating
system by gravity during priority switching of
domestic hot water heating or during summer
operation.
5167 455 v1.2
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Page 8
Installation Examples
Without a mixing valve,
and with domestic hot water production
with Vitotronic 100
Model KK10 or KW10 control
Heating circuit
Spring-loaded flow check valve
Circulation pump
Pressure relief valve
Precharged expansion tank
Domestic hot water storage tank
(indirect-fired)
DHW Pump Module
Gas connection
The installation of the check valve to restrict
gravity circulation in the heating supply pipe
prevents uncontrolled heat flow to the heating
system by gravity during priority switching of
domestic hot water heating or during summer
operation.
8
5167 455 v1.2
Page 9
With a 4-way mixing valve to regulate heating circuit,
and with domestic hot water production
with Vitotronic 200
Model KW2 control
Installation Examples
Heating circuit
Spring-loaded flow check valve
Circulation pump
Pressure relief valve
Precharged expansion tank
Domestic hot water storage tank
(indirect-fired)
4-Way mixing valve
Gas connection
The installation of the check valve to restrict
gravity circulation in the heating supply pipe
prevents uncontrolled heat flow to the heating
system by gravity during priority switching of
domestic hot water heating or during summer
operation.
5167 455 v1.2
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Page 10
Installation Examples
With two low-temperature circuits with mixing valves,
one high temperature circuit without mixing valve,
and with domestic hot water production
with Vitotronic 300
Model KW3 control,
combined with two Mixing Valve Actuator Accessory Kits
10
Heating circuit
Spring-loaded flow check valve
Circulation pump
Pressure relief valve
Expansion tank
Domestic hot water storage tank
(indirect-fired)
3-Way mixing valve
Gas connection
The installation of the check valve to restrict
gravity circulation in the heating supply pipe
prevents uncontrolled heat flow to the heating
system by gravity during priority switching of
domestic hot water heating or during summer
operation.
5167 455 v1.2
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5167 455 v1.2
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Printed on environmentally friendly
(recycled and recyclable) paper.
Viessmann Manufacturing Company (U.S.) Inc.
45 Access Road
Warwick, Rhode Island • 02886 • USA
Tel. (401) 732-0667 • Fax (401) 732-0590
www.viessmann-us.com • mail@viessmann-us.com
12
Viessmann Manufacturing Company Inc.
750 McMurray Road
Waterloo, Ontario • N2V 2G5 • Canada
Tel. (519) 885-6300 • Fax (519) 885-0887
www.viessmann.ca • mail@viessmann.ca
Technical information subject to change without notice
5167 455 v1.2
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