Viessmann VITOROND 200 Instruction manual

Product may not be exactly as illustrated.
Viessmann North America offers the side-mounted control option only.
This trademark is registered with the U.S. Patent and Trademark Office.
Technical Data Manual
Model Nos. and pricing: see Price List
V
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VI
II
IT
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Triple-pass hot water heating boiler
49 to 1 96 MBH / 144 to 321 kW
Vitorond 200
VD2A Series
Oil-/Gas-fired boiler
triple-pass sectional cast iron design
with Eutectoplex heat transfer surface and Therm-Control integrated
low temperature protection logic
for operation with modulating water temperatures
Heating input: 49 to 1 96 MBH
144 to 321 kW
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Product Information
2VITOROND 200, VD2A
VITOROND 200
The Vitorond 2 is a triple-pass sectional
cast iron oil-/gas-fired boiler for commercial
heating applications.
Its Eutectoplex heat exchanger provides high
operational reliability and a long service life,
while the triple-pass design ensures
efficient, low-emission combustion.
The VD2A Series features Therm-Control
integrated low-temperature protection logic
and a redesigned return water distribution
system for a simplified design and system
integration.
he benefits at a glance:
HEfficient and reliable operation. Modulated
boiler water temperatures help conserve
energy by closely matching system output
to actual demand. Viessmann system
controls ensure consistent, maximum
system efficiency.
Combustion efficiency up to:
- oil 87.7%.
....................................................
- gas 84.8%...................................................
Thermal efficiency up to:
- oil 87.9%.....................................................
- gas 85.2%...................................................
HSimplified design and system integration
with Therm-Control integrated
low-temperature protection logic,
eliminating the need for a low-temperature
protection package or shunt pump.
No minimum boiler return water
temperature when used with Viessmann
Vitotronic controls.
HSimplified water connection. Wide water
galleries and a large water content provide
excellent natural circulation and a reliable
heat transfer. No minimum heating water
flow rate required.
HHigh operational reliability and a long service
life are achieved by the special Eutectoplex
gray cast iron heat exchanger. A uniform
heat transfer and controlled water flow,
together with inherent characteristics of the
cast iron sections, eliminate stress fractures,
counteract the formation of condensate and
extend the lifecycle of the boiler.
HLow environmental impact thanks to
low-emission combustion achieved by the
boiler’s triple-pass design.
HProblem-free transport into
difficult-to-access boiler rooms thanks to
sectional construction and low weight of
individual sections. The Fastfix system
facilitates a quick and easy installation.
HSimple, quick assembly of the individual
cast iron sections with new
tongue-and-groove system with silicone
sealant. The gasket seal is secured in
place by the double groove, and therefore
not subject to mechanical stresses.
HEasy cleaning access facilitated by a
hinged left- or right-swing combustion
chamber door providing easy access to all
three flue gas passageways from the front
of the boiler, reducing side clearance.
HEfficient and safe operation of the heating
system with Vitotronic digital boiler and
heating system controls. Tailored to suit
every requirement, these controls cover all
known control strategies and applications.
Standardized LON BUS enables complete
integration into building management
systems. Optional integration into the
Vitocontrol control panel.
HConsistent and reliable DHW production
with indirect-fired Vitocell 1 steel or
Vitocell 3 stainless steel tanks.
Tanks may be combined into multiple-tank
batteries for applications requiring larger
quantities of hot water.
HComprehensive standard equipment saves
valuable time in installation and sourcing
of product. The supply and return header
system is pre-built for left or right
connections and positions components
properly.
HBoilers, controls, domestic hot water
tanks, and heating system components
are design-matched to work together. All
components are compatible and are
therefore quickly and easily installed.
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Product Information
Cross-Section
VITOROND 200, VD2A 3
Viessmann North America offers the side-mounted control option only.
AExtremely effective 4” / 1 mm
thick insulation
BThird pass
CVitotronic control - intelligent and
easy to install, operate and service
DBurner door insulation
ELow-emission burner (Weishaupt or
Riello)
FSecond pass
GEutectoplex heat exchanger surface
constructed from homogeneous
special gray cast iron
HCombustion chamber
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Technical Data
4VITOROND 200, VD2A
echnical Data
Boiler model VD2A- 125 160 195 230 270
Input (oil)*1MBH 49 628 765 9 2 1 59
kW 144 184 224 264 31
Input (gas)*1MBH 5 8 65 792 934 1 96
kW 149 19 232 274 321
Output (oil/gas)*2MBH 433 553 672 794 932
kW 127 162 197 232 272
Combustion efficiency (oil) % 87.7 87.3 87.3 87.3 87.3
Combustion efficiency (gas) % 84.7 84.8 84.8 84.8 84.8
hermal efficiency (oil) % 87.9 87.6 87.4 87.3 87.2
hermal efficiency (gas) % 85.2 85.1 84.8 84.8 84.7
Number of cast iron sections 4 5 6 7 8
Cast iron block dimensions*3
Length (dimension f)
Width (dimension c)
Height (dimension b)
in
mm
in
mm
in
mm
26½
67
31
79
35
884
33
84
31
79
35
884
39¾
1 1
31
79
35
884
46½
118
31
79
35
884
53¼
135
31
79
35
884
Cast iron section dimensions*3
Front section (with combustion
chamber door)(dimension j)
Intermediate section
(dimension i)
Rear section (with flue gas
collar)
in
mm
in
mm
in
mm
35 x 31 x 11½
885 x 79 x 29
34 x 26¾ x 6¾
86 x 68 x 17
35 x 34 x 1 ½
885 x 86 x 27
Dimensions (with insul.
jacket)*3
Total length (dimension g)
Total width with side-
mounted Vitotronic NR2
control (dimension e)
Total width (dimension d)
Total height with boiler base
(dimension h)
Total height with supply
header (dimension a)
in
mm
in
mm
in
mm
in
mm
in
mm
35¾
9 5
4 ½
1 3
34
86
39½
1 7
58½
1485
42¼
1 75
4 ½
1 3
34
86
39½
1 7
58½
1485
49
124
4 ½
1 3
34
86
39½
1 7
58½
1485
55½
141
4 ½
1 3
34
86
39½
1 7
58½
1485
62¼
158
4 ½
1 3
34
86
39½
1 7
58½
1485
Weight
Front section (with combustion
chamber door)
Intermediate section
Rear section (with flue gas
collar)
Cast iron heat exchanger block
Overall weight
(complete with jacket,
without burner)
lbs
kg
lbs
kg
lbs
kg
lbs
kg
lbs
kg
352
16
22
1
242
11
1122
51
12 1
545
352
16
22
1
242
11
1353
615
1441
655
352
16
22
1
242
11
1584
72
1675
76
352
16
22
1
242
11
176
8
1874
85
352
16
22
1
242
11
1991
9 5
2127
965
*1 Input ratings are based on AN I Z21.13a*C A 4.9a-2007 - Gas Fired team and Hot Water Boilers;
C A B140.7-05 - Oil Burning Equipment - team and Hot Water Boilers;
C A B140.0-03 - Oil Burning Equipment - General Requirements;
UL 726 - 7th ed. - Oil-Fired Boiler Assemblies;
and UL 795 - Commercial Industrial Gas Heating Equipment.
*2Output ratings are based on the IBR BT -2000 “method to determine efficiency of commercial space heating boilers”.
*3 Inch dimensions are rounded to the nearest ¼”.
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Technical Data
VITOROND 200, VD2A 5
echnical Data
Boiler model VD2A- 125 160 195 230 270
Boiler water content USG
ltr
32
122
41
154
49
186
57
217
66
249
Max. boiler temperature*4
(= fixed high limit)
°F
°C
25
121
25
121
25
121
25
121
25
121
Max. allow. operating
pressure*5 psig 85 85 85 85 85
Boiler connections*6
Boiler supply and return
Drain valve - sediment faucet
in
in 2½
¾
2½
¾
2½
¾
2½
¾
2½
¾
Heating surface area
Flue gas side ft.2
m253 4.9
7
6.5
85
7.9
1 2
9.5
117
1 .9
Water side ft.2
m243 4.
57
5.3
71
6.6
85
7.9
99
9.2
Flue gas
– Temperature (gross)*7
– Flue gas mass flow rate
With minimum heating input
and a 2-stage burner
(operation of stage 1)
– Temperature
– Flue gas mass flow rate at
minimum input rate
°F
°C
lbs/h
kg/h
°F
°C
lbs/h
kg/h
365
185
47
213
257
125
282
128
365
185
6 2
273
257
125
362
164
365
185
732
332
257
125
439
199
365
185
864
39
257
125
516
234
365
185
1 14
457
257
125
6 4
274
Standby loss
based on max. heating input
and hot water supply and
return temperatures of
167 / 14 °F
75 / 6 °C
% .4 .38 .28 .25 .25
Vent pipe collar outer ∅*8 in
mm
8
2
8
2
8
2
8
2
8
2
Flue gas resistance “w.c. .26 .38 .4 .48 .64
Flue gas volume
of combustion chamber and
flue gas passageways
ft.3
m34.9 9 .139
6. 39
.171
7.169
.2 3
8.299
.235
9.429
.267
Required flue draft
Category I
Pa
“w.c.
Positive pressure
Category III
Pa
“w.c.
2
. 8
2
. 8
2
. 8
2
. 8
2
. 8
*4 The maximum supply operating temperature (= max. adjustable high limit) lies approx. 27°F / 15°C below the fixed high limit setting.
*5 May be less in some Canadian provinces.
*6 Connections for boiler connection kit (standard equipment).
*7 Combustion results are based on 13.0% CO2with fuel oil #2 and 10% CO2with natural gas, as well as
a system supply temperature of 167°F / 75°C, and a system return temperature of 140°F / 60°C.
Measured flue gas temperature with a combustion air temperature of 68°F / 20°C and a boiler water temperature of 176°F / 80°C.
*8 Vent pipe collar diameter does not automatically indicate vent/chimney size. See page 20 for different venting options (categories).
"The combustion burner head material must be suitable for temperatures of at least 932°F / 500°C.
"For information regarding other Viessmann ystem Technology componentry, please reference documentation of respective product.
5354 787 v1.2

Technical Data
6VITOROND 200, VD2A
Legend
BD Boiler drain, ¾”
BWR Boiler water return
BWS Boiler water supply
CO Clean-out opening
FGC Flue gas collar
SG Sight glass
LWCO Low water cut-off
Burner Installation
The burner must be fitted to the
burner plate; installations direct to
the boiler door are not feasible.
Viessmann supplies a pre-drilled end
burner plate in accordance with the
supplied burner dimensions.
Note
For mounting burners with blast
tube diameters over 6” / 15 mm,
the door insulation (refractory
material) can be cut to the required
size.
The blast tube must protrude from
the thermal insulation on the boiler
door.
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a
b
c
d
eg
BWS
BWR
FGC
LWCO
f
h
64” / 1623 mm*1
18¼” / 465 mm
18¼” / 465 mm
31¼” / 795 mm
38” / 97 mm
6¾” /
17 mm
*1 Dimension includes sub-base.
Please note: Inch dimensions are rounded to the nearest ¼”.
Fig. 1
i
j
Viessmann North America offers the
side-mounted control option only. Refer to
the side-mounted control dimension on
page 4.
Attention
25¼” / 64 mm
18¼” / 465 mm
∅6” / 15 mm
275 mm
1 7/8” /
Please note: Inch dimensions are rounded to the nearest ¼”.
5” / 125 mm
Fig. 2

Technical Data
Legend
SS Safety supply - connection to pressure relief valve
LWCO Low water cut-off
TG Temperature gauge
BWS Boiler water supply
LWCO
BWS
SS
TG
*1Single
Aquastat
(optional)
*1Dual
Aquastat
(optional)
95/8” / 245 mm
95/8” / 245 mm
57/8” / 148 mm 7¾” / 195 mm
193/8” / 49 mm
Please note: Inch dimensions are rounded to the nearest 1/4”.
Fig. 3
VITOROND 200, VD2A 7
Boiler Connection Kit (Standard Equipment)
*1
Boiler must be controlled via Viessmann
Vitotronic herm-Control logic in order to
prevent the formation of flue gas
condensation at all local site return water
temperatures. Consult your local Viessmann
echnical Representative for other possible
control options.
5354 787 v1.2
IMPOR AN

Technical Data
8VITOROND 200, VD2A
Clearances to Combustibles
Boiler model VD2A- 125 160 195 230 270
Top 6” / 15 mm
Sides 6” / 15 mm
Flue (oil) 9” / 229 mm
Flue (gas) 6” / 15 mm
Front 6” / 15 mm
Floor non-combustible
HAvoid air contamination by halogenated
hydrocarbons (e.g. as in sprays, paints,
solvents and cleaning agents)
HAvoid very dusty conditions
HAvoid high levels of humidity
HProtect against frost and ensure good
ventilation
Otherwise, the system may suffer faults and
damage. In rooms where air contamination
through halogenated hydrocarbons may
occur, install the boiler only if adequate
measures can be taken to provide a supply
Maintain 1” air clearance from uninsulated
hot water pipes to combustible material.
Boiler must not be installed on combustible
floor material.
Recommended Minimum Service Clearances
The combustion chamber door is factory
assembled to hinge on the left-hand side.
A right-hand hinge is feasible by rebuilding
the door hinge hardware.
Boiler
model
VD2A-
125 160 195 230 270
a1in
mm
47¼
12
55
14
63
16
71
18
79
2
b2Dependent on burner model
Inch dimensions are rounded to the nearest
¼”.
1Minimum clearance in front of boiler
2Burner height [plus 8” (2 mm) for door
clearance to wall].
Front clearances (dimension “a”) will allow
for easy removal of flue gas turbulator
inserts, as well as for full insertion of bristle
brush for heat exchanger cleaning.
Minimum side clearance of 20” / 500 mm
must be maintained for side-mounted
Vitotronic control.
5354 787 v1.2
IMPOR AN
IMPOR AN
2 ” /
5 mm
2 ” / 5 mm
24” /
6 mm
17 mm
17” /
43 mm
8” / 2 mm
Fig. 4
6¾” /
Top View
IMPOR AN

Technical Data
VITOROND 200, VD2A 9
Waterside Flow
The Vitorond 2 boiler is designed for closed loop, forced
circulation, hot water heating systems only.
The recommended water flow rate through the Vitorond 2
is based on a temperature difference of between 2 °F and
4 °F / 11°C and 22°C (see table below). When a balancing
valve is used for proper balancing and water flow through the
boiler, the valve should be installed 5 pipe diameters from any
fittings and 1 pipe diameters from circulation pumps to allow
for laminar flow.
The consulting engineer or contractor should review the
system design if more balancing valves are required to
properly balance the system.
Viessmann can supply TA (Victaulic) balancing valves upon
request. The balancing should be carried out by a certified
balancing firm prior to boiler start-up. Please contact
Viessmann for your closest certified balancing firm.
VD2A-125 and VD2A-16
VD2A-195
VD2A-23 and VD2A-27
Recommended Flow Rates
Boiler model VD2A- 125 160 195 230 270
2 °F ∆t*1
4 °F ∆t
11°C ∆t
22°C ∆t
GPM
GPM
ltrs/s
ltrs/s
43
21
2.7
1.3
55
27
3.4
1.7
67
33
4.2
2.1
79
39
5.
2.5
92
46
5.8
2.9
*1 ∆t= temperature difference
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34 5 8 1 15 2 25 3
35
18 22
13 118866
44 132
5
8
1
15
2
25
3
35
5
4
8
1
4
6
2
3.2
32
4
2
16
14
12
1
8
624
7
28
mbar
”W.C.
m3/h
USG/min
Flow rate
Pressure drop
A B C
Fig. 5

Technical Data
1 VITOROND 200, VD2A
Burner Calibration
Weishaupt burners / Riello burners
A Vitorond 2 , VD2A boiler with a high-performance gas burner installed can achieve a
thermal efficiency of up to 85.2%, and up to 87.9% if equipped with a #2 oil burner as
follows:
Gas-fired
1 % volume CO2, 28 °F / 138°C net stack temperature, CO in ppm < 5
Oil-fired
13% volume CO2, 3 °F / 149°C net stack temperature, smoke spot - 1
(on the Bacharach Scale)
ee separate instructions supplied with the burner.
The maximum input published for each boiler size must not be exceeded.
Model Flue gas
resistance
mbar “w.c.
VD2A-125
VD2A-16
VD2A-195
VD2A-23
VD2A-27
.65
.95
1.
1.2
1.6
.26
.38
.4
.48
.64
Burner manufacturer
Weishaupt or Riello
Burner/Gas train approval
Standard approvals are CSA (for Canada) and UL (for U.S.). IRI and FM approved equipment
is also available - please inquire.
Electrical requirements
Weishaupt W Series and Riello burners are available in 12 VAC, single-phase, in a 6 Hz
configuration. It is generally acceptable to use voltages within ten percent of the supply
voltage. Available voltage inside boiler room must be provided at time of order. Ensure
appropriate disconnect means and overcurrent protection.
Natural gas pressure
Natural gas pressures and heating values as provided by the gas utilities vary greatly across
North America. Select the appropriate gas train accordingly. Low pressure gas trains have a
maximum input of 14 ”w.c.; high pressure gas trains have a maximum pressure of 5 psig.
Minimum gas pressures apply - please inquire. Gas pressures and heating values at site
must be provided at time of order.
5354 787 v1.2

Technical Data
VITOROND 200, VD2A 11
New Casting Design and herm-Control Functionality
A specific, matching boiler control is part of the standard equipment of the Vitorond 2 , VD2A.
Boiler protection is assured by the following:
- Therm-Control logic
- Control of a shunt pump
- Flow rate reduction in the heating circuits
- Constant return temperature control
The cast iron mid-sections were re-designed
to increase the heat exchanger surface area
and water volume, and the number of cast
iron sections was reduced by one section.
Together with the redesigned return water
distribution system and the Therm-Control
low-temperature protection logic, this
eliminates the need for a minimum return
water temperature.
The larger water volume and increased
width of the flue passages also ensure even
heating of the water and reduced burner
cycling.
A new tongue-and-groove system with
silicone sealant replaces the fiber-rope seal
between sections used with the VD2 Series.
Redesigned Return Water Distribution System
System return water enters the cast iron
sections of the VD2A boiler via a return
water distribution tube now located at the
top of the cast iron block (see Fig. 8).
Heated supply water flows at the bottom of
the cast iron block towards the rear section
and upward to the supply connection. The
return water temperature is elevated when
passing through the rear cast iron section
where the supply water flows upward to the
boiler supply connection.
The pre-heated return water is then
distributed to the cast iron sections through
two upward-pointing openings in the
distribution tube at each section. The size of
the opening is proportional to the amount of
heat input of each cast iron section. In each
section the return water flows downward
and mixes with heated water. Once fully
heated, the supply water flows through the
bottom of the cast iron block up the rear
section and out the boiler supply to the
system.
The even temperature distribution ensured
by this design reduces the thermal stress on
the heat exchanger and, in conjunction with
the Vitotronic Therm-Control logic, prevents
the formation of flue gas condensate at all
return water temperatures, eliminating the
need for a shunt pump or return temperature
elevation provided by a Low Temperature
Protection (LTP) Package.
5354 787 v1.2
Fig. 6
VD2 cast iron section
Fig. 7
VD2A cast iron section
Fig. 8
Boiler supply
Boiler return
Therm-Control sensor
Return water distribution tube
Fig. 8

Technical Data
12 VITOROND 200, VD2A
herm-Control Low- emperature Protection Logic
Fig. 9
A specific, matching boiler control is part of
the standard equipment of the Vitorond
2 , VD2A. Boiler protection is assured by
the following:
HTherm-Control logic
HControl of a shunt pump
HFlow rate reduction in the heating
circuits
HConstant return temperature control
Therm-Control is an integrated
low-temperature protection logic provided by
the Vitotronic, GC1 control.
The control uses a Therm-Control
temperature sensor specifically positioned in
the casting close to the boiler return (shown
in Fig. 8 on page 11) to capture the thermal
state of the boiler (i.e. the temperature of
the system return mixed with the boiler
water) and react as early as possible. The
Therm-Control Logic shuts off the system
pump (and, if applicable, closes the mixing
valve) and brings the burner to full fire until
the boiler minimum setpoint temperature is
reached during start-up, preventing the
formation of flue gas condensation and
allowing for maximum heat transfer to the
system.
This ensures steady supply temperatures
with only minimal fluctuations, and
eliminates the need for a shunt pump or
return temperature elevation provided by a
Low Temperature Protection (LTP) Package.
Example:
Take a heating system with one heating
circuit and a mixing valve.
In the start-up phase, the set Therm-Control
temperature is not achieved at the
Therm-Control sensor.
The mixing valve downstream of the boiler
receives a signal via the control to reduce
the flow rate and to operate the burner at
full fire (Phase 1 shown in Fig. 9). The boiler
temperature and that captured by the
Therm-Control sensor now rapidly rise. The
mixing valve opens when the set
temperature is exceeded at the
Therm-Control sensor, and the flow rate (in
this example 5 %) inside the boiler is
steadily increased (Phase 2).
The return water temperature rises after
a certain time has elapsed which is a
function of the system water volume. As the
return temperature rises, the mixing valve
opens further until the maximum flow rate
(1 %) is achieved. Now the control will
modulate the burner firing rate to achieve
the required setpoint (burner modulation),
and weather-responsive boiler water
temperature modulation will take place.
5354 787 v1.2
Phase 1 -
tart-up
condition
Phase 2 -
tart-up
condition
Phase 3 -
Operating
condition
%
flow
rate
5 %
flow
rate
1 %
flow
rate

Standard Equipment
VITOROND 200, VD2A 13
Standard Equipment
Note:
Boiler controls and burners are purchased separately. Please see Price List for details.
HThe cast iron sections are delivered as a
block or loose individual units on skids.
HThe combustion chamber door with
burner plate comes mounted on the front
section.
HThe flue gas collector, with two
inspection opening covers (fastened with
screws), is mounted on the rear section.
1 carton containing supply header
1 carton containing insulation panels and
cleaning brushes
1 carton containing the boiler control
1 carton containing installation fittings with
safety header
Standard equipment includes:
– Boiler base with leveling bolts
– Connection piping with counter flanges and
gaskets
– Turbulators are packed in a bag and placed
inside the combustion chamber
When cast iron sections are delivered as
individual units:
– Push nipples, high temperature silicone and
linseed oil with graphite based sealant are
packed in a carton and placed inside the
combustion chamber
Ensure specific regional, provincial, or
state requirements, such as fuel train and
additional safety control requirements
etc., are known before the product order
is placed, to determine proper burner
selection and pricing.
5354 787 v1.2
IMPOR AN

Boiler Control Alternatives
14 VITOROND 200, VD2A
Boiler Control Alternatives
For single-boiler installations:
Vitotronic 100, GC1
– Electronic boiler control unit for a constant
boiler water temperature or
weather-compensated operation in
conjunction with a Vitocontrol panel with
Vitotronic 3 -K (type MW1S) or an
external control unit
– For two-stage or modulating burners
– With control unit for DHW primary system
with mixing valve assembley or as an
alternative to the control of a constant
return temperature with a regulated
three-way valve
– With internal diagnostic system
– A function extension to default the set boiler
water temperature via - 1 V input can be
connected (optional)
External demand:
– Enable boiler/open butterfly valve
– Burner stage 1 ON
– Burner stage 1 and 2 ON
– Isolation valve “close”
Provide a potential free contact for each
demand.
Connect the potential free contacts to plug-in
connectors aVD and/or aVH.
Vitotronic 300, GW2*1
– Weather-compensated, digital boiler and
heating circuit control unit
– For single-boiler systems
– For up to 2 heating circuits with mixing
valve
– For two-stage or modulating burners
– With time switch offering individual and
7-day programs
– Programming unit with plain text prompts
– With separately adjustable periods and
heating curves
– With control for DHW primary systems
with mixing valve assembly or alternatively,
for the control of a constant return
temperature with a regulated three-way
valve
– With internal diagnostic system
– A function extension to default the set boiler
water temperature via - 1 V input can be
connected (optional)
An extension kit is required for each heating
circuit with mixing valve. The LON
communication module is required to enable
communication.
For multiple-boiler installations:
Vitotronic 100, GC1*1
Digital boiler control systems for modulating
boiler and common supply temperature
control.
– Electronic boiler control unit
– For two-stage or modulating burners
– Optional communication via LON
Vitocontrol*1
– Weather-compensated cascade control unit
for multi-boiler systems with up to 4 boilers
with the Vitotronic 1 (type GC1)
– For up to 2 heating circuits with mixing
valve
– With time switch offering individual and
7-day programs
– Programming unit with plain text prompts
– With control unit for DHW primary
systems with mixing valve assembly
– With lead boiler selection
– Optional communication via LON
– With integral diagnostic system and
additional functions
– A function extension to default a set system
flow temperature via a - 1 V input can
be connected (optional)
An extension kit is required for each heating
circuit with mixing valve
*1 ee respective product manuals for details. Please inquire with your Viessmann Representative for further assistance.
5354 787 v1.2

Boiler Control Alternatives
VITOROND 200, VD2A 15
Boiler Control Alternatives (continued)
Vitocontrol equipment for multiple-boiler system
Vitotronic 100, GC1
– Electronic boiler control unit
– For two-stage or modulating burners
– Optional communication via LON
Vitotronic 300-K, MW1
– Weather-compensated cascade control unit
for multi-boiler systems with up to 4 boilers
with the Vitotronic 1 , GC1
– For up to 2 heating circuits with mixing
valves
– With time switch offering individual and
7-day programs
– Programming unit with plain text prompts
– With DHW thermostat
– With control unit for DHW primary systems
with mixing valve assembly
– With lead boiler selection
– Optional communication via LON
– With integral diagnostic system and
additional functions
– A function extension to default a set system
flow temperature via a -1 V input can be
connected (accessories)
An extension kit is required for each heating
circuit with mixing valve.
Legend
AUp to 4 boilers with a
Vitotronic 1 , GC1
BOutside temperature sensor
CVitocontrol control panel with
Vitotronic 3 -K, MW1S
DFlow temperature sensor
Custom control panels
For single- or multiple-boiler installations:
Custom control panels for residential or
commercial applications are designed and
manufactured by Viessmann to suit any
customer’s specific requirements. Custom
control panels can have features such as
pool heating, hot tub heating, snow melting,
telephone tie-in, integration with Building
Management Systems, as well as several
other functions. Please inquire.
Please ote:
The control of the Vitorond 200, VD2A
boiler can be mounted either on the left- or
right-hand side of the boiler.
Please specify control location at the time of
order.
5354 787 v1.2
Fig. 10
A
B
C
DD

Boiler Control Alternatives
16 VITOROND 200, VD2A
Single-Boiler System: Vitorond 200, VD2A with herm-Control
Applications
Heating system with manifold installed close
to the boiler. The boiler water flow rate
must be able to be reduced.
Main components
Single boiler system with:
HVitorond 2 , VD2A, 125 to 27 .
HVitotronic 3 , GW2 model or Vitotronic
1 , GC1 model with Vitocontrol panel
and integral weather-compensated
Vitotronic 2 -H, HK1S / HK3S model or
Vitotronic 1 , GC1 model and external
weather-compensated control unit.
HTherm-Control for operating boilers
without low temperature return package.
Function description
The Therm-Control will affect the heating
control unit(s) or the heating circuit pump(s),
if the factory-set temperatures are not
reached at the Therm-Control temperature
sensor. In the start-up phase (e.g. during
commissioning or after a night or weekend
shutdown), the boiler water flow rate must
be reduced by at least 5 %.
The boiler is protected to an optimum level
when using the Vitotronic 3 , GW2 model
or if the heating circuits are regulated via a
Vitotronic 2 -H connected to the boiler
control unit. No additional on-site protective
measures are required.
When it is impossible to reduce the boiler
water flow rate, e.g. in older systems, we
recommend contacting Viessmann for other
possible piping layouts.
No minimum return water temperature
needs to be maintained. Shunt pumps and/or
boiler circuit pumps/costly mixing valves are
not required for elevating the return
temperature.
DHW heating
The DHW is heated up when the actual
temperature falls below the DHW
temperature selected for the tank
temperature sensor, subject to tank heating
being enabled by the time switch.
The boiler water temperature is raised to the
set DHW temperature +2 K / 36ºF and the
tank primary pump is started, if the boiler
water temperature is 7 K / 12.6ºF above the
actual DHW temperature.
The heating circuit pumps M2 and M3 are
closed, subject to absolute priority being
enabled, if the heating circuits are regulated
via the Vitotronic. Subject to modulating
priority, the heating circuit pumps M2 and
M3 remain switched ON and the mixing
valves M2 and M3 are closed far enough for
the set boiler water temperature for tank
heating to be achieved.
Heating operation
Depending on the control unit used, the flow
temperature of heating circuits can be
operated in modulating mode, subject to the
outside temperature. The boiler water
temperature is regulated 8 K / 14.4ºF higher
than the set flow temperature.
Wiring Diagram: Single-Boiler System, Vitorond 200, VD2A with herm-Control
The Therm-Control wiring in heating
systems with heating circuit control units, is
not connected to the boiler control unit via
the LON.
Required coding:
Change “4C” to “2” - use the plug-in
connector sÖA1 to close the downstream
mixing valve. Change “ D” to “1” - the
Therm-Control acts on the mixing valve of
the downstream heating circuits (for
Vitotronic 2 and 3 , delivered
condition).
Legend
AContactor relay, field supplied
sÖA1 Closing mixing valves (Vitotronic 1 ,
GC1)
AContactor relay, field supplied
BDownstream heating circuit control
unit
Switching contact closed:
signal for close mixing valve(s)
CPower connection 12 VAC 6 Hz
DJunction box, field supplied
5354 787 v1.2
Fig. 11
AA
C
D
A
B

Boiler Control Alternatives
VITOROND 200, VD2A 17
Installation Example: Single-Boiler System, Vitorond 200, VD2A with herm-Control
Fig. 12
AHeating circuit with mixing valves
BDHW tank
Plug
!Outdoor temperature sensor
(only for Vitotronic 2 and 3 )
?M2 Flow temperature sensor, mixing
valve (only for the Vitotronic
3 )
?M3 Flow temperature sensor, mixing
valve
§Boiler water temperature sensor
%DHW tank temperature sensor
(accessory for the Vitotronic 1 )
aJATherm-Control temperature
sensor
sÖM2 Heating circuit pump, mixing
valve (only for Vitotronic 3 )
sÖM3 Heating circuit pump, mixing
valve (only for Vitotronic 3 )
sÖA1 Closing the mixing valves with
external heating circuit control
units
sA DHW primary pump
sK DHW circulation pump (only for
the Vitotronic 2 and 3 )
fA Burner (stage 1)
gSM2 Mixing valve motor (only for
Vitotronic 3 )
gSM3 Mixing valve motor (only for
Vitotronic 3 )
lÖ Burner
(burner stage 2 / mod.)
Please refer to the control
manuals Vitotronic 100, GC1
and Vitocontrol- , VD2/CT3.
5354 787 v1.2

Boiler Control Alternatives
18 VITOROND 200, VD2A
Multi-Boiler System: Vitorond 200, VD2A with herm-Control
Applications
Heating system with manifold installed close
to the boiler. The boiler water flow rate will
be reduced via the motorized butterfly valve.
Main components
Multi-boiler system with:
HVitorond 2 , VD2A, 125 to 27 .
HVitotronic 2 -H and
-Vitotronic 1 , GC1, for every boiler in a
multi-boiler system
and
Vitotronic 3 -K, MW1, one required for
multi-boiler systems
or
-Vitotronic 1 , GC1, for every boiler in a
multi-boiler system
and
Vitocontrol control panel and integral
weather-compensated control unit
Vitotronic 3 -K, MW1S
-external, weather-compensated cascade
control unit with tank thermostat
HTherm-Control for operating boilers
without return temperature elevating
package.
Function description
The Therm-Control will regulate the
motorized butterfly valves or the heating
circuit control unit(s), if the factory-set
temperatures are not reached at the
Therm-Control temperature sensor. In the
starting phase (e.g. during commissioning or
after a night or weekend shutdown), the
boiler water flow must be proportionally
reduced.
Reduce the flow rate via the heating mixing
valve using the Vitotronic 3 -K, MW1 or
when regulating the heating circuits via a
Vitotronic 2 -H connected to the boiler
control unit. No additional protection
measures are required on-site.
No minimum return temperature needs to be
maintained.
No shunt pumps and/or boiler circuit
pumps/costly mixing valves are required for
raising the return temperature.
DHW heating
DHW is heated up when the actual
temperature falls below the DHW
temperature selected for the tank
temperature sensor, subject to tank heating
being enabled by the time switch. The boiler
water temperature is raised to the set DHW
temperature +2 K / 36ºF and the tank
primary pump is started, if the boiler water
temperature is 7 K / 12.6ºF above the actual
tank temperature.
The heating circuit pumps M2 and M3 are
switched OFF and the mixing valves M2 and
M3 are closed, subject to absolute priority
being enabled, if the heating circuits are
regulated via the Vitotronic.
Heating operation
Depending on the control unit used, the flow
temperatue of heating circuits can be
operated in modulating mode, subject to the
outside temperature. The boiler water
temperature is regulated 8K / 14.4ºF higher
than the set-point.
5354 787 v1.25354 787 v1.2

Boiler Control Alternatives
VITOROND 200, VD2A 19
Installation Example: Multi-Boiler System, Vitorond 200, VD2A with herm-Control
Fig. 13
LON LON connection (available connections with terminator)
AHeating circuit with mixing valves
BDHW tank
Plug
!Outdoor temperature sensor
(only for Vitotronic 3 -K)
?Flow Flow temperature sensor,
common heating flow (only for
the Vitotronic 3 -K)
?M2 Flow temperature sensor, mixing
valve (only for the Vitotronic
3 -K)
?M3 Flow temperature sensor, mixing
valve (only for the Vitotronic
3 -K)
?Flow temperature sensor
Vitotronic 2 -H
§Boiler water temperature sensor
%DHW tank temperature sensor
(only for Vitotronic 3 -K)
aJATherm-Control temperature
sensor
sÖM2 Heating circuit pump, mixing
valve (only for Vitotronic 3 -K)
sÖM3 Heating circuit pump, mixing
valve (only for Vitotronic 3 -K)
sÖ Heating circuit pump Vitotronic
2 -H
sK DHW circulation pump (only for
the Vitotronic 3 -K)
fÖ Power supply, 12 VAC
6 Hz
Install the main isolator in
accordance with regulations
fA Burner (stage 1)
gSA1 Motorized butterfly valve
gSM2 Mixing valve motor (only for
Vitotronic 3 -K)
gSM3 Mixing valve motor (only for
Vitotronic 3 -K)
gSM3 Mixing valve motor, Vitotronic
2 -H
lÖ Burner
(burner stage 2 / mod.)
aVD/aVH External connections
Please refer to the control
manuals Vitotronic 100, GC1
and Vitocontrol- , VD2/CT3.
5354 787 v1.2

System Design Considerations
2 VITOROND 200, VD2A
System Design Considerations
Burner Calibration
With 2-stage and fully modulating
burners, ensure that the chimney is
compatible with the lower flue gas
temperatures associated with partial load
conditions set on the burner.
Never operate boiler without an installed
venting system which safely vents all
products of combustion to the outdoors.
The vent system must comply with all
applicable local and/or national codes.
Vitorond 2 , VD2A boilers are Category I
and III boilers as defined in ANSI Z21.13
when used with natural gas and LP. Venting
systems shall be sized and constructed in
accordance with approved engineering
methods (ASHRAE, HVAC Systems and
Equipment Handbook, Chapter 31
“Chimney, Gas Vent, and Fireplace
Systems”) including the chimney and boiler
manufacturer’s instructions.
In Canada
For gas-fired boilers install venting system in
accordance with all applicable local codes.
In the absence of local codes, follow
national codes CAN/CSA B149.1 or .2 or
latest edition.
For oil-fired boilers follow CSA B-139 or
latest edition.
In U.S.A.
For gas-fired boilers connecting to gas vents
or chimneys, vent installations shall be in
accordance with Venting of Equipment of
the National Fuel Gas Code, ANSI Z223.1 or
applicable provisions of the local building
codes.
For oil-fired boilers follow NFPA 31. Always
use latest code editions.
Venting (option #1)
The Vitorond 2 , VD2A boiler is approved
as a Category I appliance and must be
vented accordingly.
Chimney
For proper operation of the Vitorond 2 ,
VD2A 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 to handle the relatively
cool flue gas temperatures produced by the
Vitorond 2 , VD2A boiler.
If the chimney system lacks sufficient
insulation and/or the chimney diameter is
too large, corrosive and damaging
condensation will result due to flue gases
cooling too quickly. If a calculated chimney
diameter lies between two values, the larger
diameter should be selected.
The chimney connection length between the
boiler vent pipe collar and the chimney must
be installed with insulation.
Vent pipe collar diameter does not
automatically indicate vent/chimney size.
We recommend consulting a reputable
chimney installer for advice in
project-specific circumstances.
When installing the Vitorond 2 , VD2A
boiler, it is necessary to install a barometric
draft regulator in the chimney/vent for
proper operation of the boiler.
Install the barometric draft regulator within
5 to 7 ft. / 1½ to 2 m from the breeching
outlet located at the rear of the boiler.
Barometric draft regulator type
For natural gas or propane applications, use
a double-acting type. For #2 fuel oil
applications, use a single-acting type.
Barometric draft regulator diameter
The barometric draft regulator must be the
same diameter opening as the chimney for
which the vent is sized.
For example, a 14” chimney would require a
14” barometric draft regulator. Do not size
the barometric draft regulator to the
breeching outlet of the boiler, unless the
chimney is also intended to be of that
diameter.
he size of the flue gas outlet on the boiler
does not automatically determine the
horizontal breeching, or the actual chimney
diameter. he chimney size must be
designed for the actual boiler model and its
input.
Venting (option #2)
The Vitorond 2 boiler is a Category III
positive pressure non-condensing boiler.
Each boiler must be vented individually.
The vent system must be properly designed
and suitable materials must be selected. The
chimney must be gas tight.
Use an AL29-4C® special stainless steel
venting system (UL/ULC listed for Category
III) for single-wall vertical venting of the
Vitorond 2 boiler.
For more details on the positive pressure
venting option, see the Viessmann
installation instructions for the positive
pressure venting system.
The following manufacturers may be
contacted for suitable stainless steel
chimneys:
Pro ech Systems Inc.
26 Gansevoort Street
Albany, NY 122 2
Tel.: [phone]
Fax: [phone]
Toll free: 1-8 -766-3473
Selkirk Metalbestos
Selkirk Canada Corporation - head office
375 Green Road
Stoney Creek, ON L8E 4A5
Tel.: [phone]
Fax: [phone]
Toll free:1-8 -263-93 8
Security Chimneys
Division of Security Chimneys Ltd.
2125 Monterey
Laval, PQ H7L 3T6
Tel.: (45 ) 973-9999
Fax: (45 ) 973-2222
Toll free: 1-8 -667-3387
5354 787 v1.2
When installing or insulating (overhead)
piping or venting, do not stand on top
panel of boiler. Advise other trades
accordingly!
WARNING he Vitorond 200, VD2A boiler is not
approved for side wall venting.
CAU ION
IMPOR AN
Barometric draft regulator