Viessmann Vitodens 200-W System Instruction manual

Technical Data Manual
VITODENS
r
200-W
5461 883 - 02 04/2015
Model Nos. and pricing: see Price List
For Natural Gas and Liquid Propane Gas
Gas-fired wall-mounted condensing boiler
12 to 125 MBH (3.5 to 37 kW)
Product may not be exactly as shown
Vitodens 200-W
Series B2HB, Models 19, 26 and 35
Gas-Fired Wall-Mounted Condensing Boiler
with modulating MatriX cylinder burner for
room air independent operation (using a
direct vent system) or room air dependent
operation.
H

Vitodens 200-W, B2HB 19 to 35 Technical Data
5461 883 - 02
2
Product Information
Vitodens 200-W
2
Equipped with the industry’s first intelligent combustion
management system and powerful control technology,
the new generation Vitodens 200-W gas-fired wall-mount
condensing boiler delivers unparalleled performance,
reliability and comfort.
The benefits at a glance:
■ Best value in its class with new industry-leading
technology and the most standard features.
■ Highest Efficiency up to 98% at full modulation and up
to 95% A.F.U.E.
■ Lasting performance with industry-leading Viessmann
made SA240 316 Ti stainless steel Inox-Radial heat
exchanger constructed to CSA B51 and ASME Section IV.
■ Low Emission Combustion with Viessmann made
stainless steel MatriX cylinder burner. Factory calibrated.
■ Fast Installation and Reduced Maintenance with Lambda
Pro, industry-first intelligent combustion management
system: Adjusts automatically to gas type and quality.
No fuel conversion kit required.
■ Powerful and User-friendly
Viessmann Vitotronic on-board multi-function outdoor
reset boiler and system control for multi-temperature
space and DHW heating.
■ Greater Venting Flexibility with increased vent length
up to 180 ft. (55 m) and multiple venting options.
- Horizontal or vertical sealed combustion coaxial
venting (field supplied).
- Horizontal, vertical or hybrid sealed combustion
double-pipe venting (field supplied).
- Horizontal or vertical single-wall venting (field
supplied).
■ Compact, Esthetic Product Design and zero clearance
to combustibles.
■ Extremely Quiet Operation; quieter than most
refrigerators.
■ True High-Altitude Operation up to 10,000 ft. (3,000 m)
with simple electronic adjustment.
■ Efficiency up to 98% through intensive condensation.
The flue gas temperature is only approximately 9-27ºF
(5-15ºC) above boiler return temperature (see chart
below).

Vitodens 200-W, B2HB 19 to 35 Technical Data
3
5461 883 - 02
Product Information
3
Cross-Section
Product may not be exactly as shown
The flue gas temperature is only approximately 9-27ºF
(5-15ºC) above boiler return temperature (see chart
below).
AInox-Radial heat exchanger made from stainless steel
– for high operational reliability and a long service life.
Large heating output in the smallest of spaces
B Modulating MatriX cylinder burner for extremely
clean combustion and quiet operation
CVariable speed combustion fan for quiet and
economical operation
DGas and water connections
EDigital boiler control unit
Delivered condition
Wall mounted gas condensing boiler with Inox-Radial heat
exchanger, modulating MatriX cylinder burner for natural
gas and LPG, plus wall mounting bracket. Vitotronic 200
for weather-compensated operation. Preset for operation
with natural gas. Fully plumbed and wired. White epoxy-
coated casing.
Vitodens 200-W B2HB 19, 26, 35

Vitodens 200-W, B2HB 19 to 35 Technical Data
5461 883 - 02
4
Technical Data
Technical Data
4
Boiler Model No. 200-W B2HB 19 26 35
Natural Gas / Liquid Propane Gas
CSA input
CSA output/DOE *1
heating capacity
Net AHRI rating *2
MBH
(kW)
MBH
(kW)
MBH
(kW)
12-68
(3.5-20)
11-64
(3.2-19)
55
(16)
19-94
(5.5-27)
18-89
(5-26)
76.5
(22)
19-125
(5.5-37)
18-117
(5-34)
102
(30)
Heat exchanger surface area ft.2
(m2)
12.96
(1.2)
12.96
(1.2)
12.96
(1.2)
Min. gas supply pressure
Natural gas
Liquid propane gas
“w.c.
“w.c.
4
10
4
10
4
10
Max. gas supply pressure *3
Natural gas
Liquid propane gas
“w.c.
“w.c.
14
14
14
14
14
14
A.F.U.E. % 95 95 95
Weight lbs
(kg)
110
(50)
110
(50)
110
(50)
Boiler water content USG
(L)
1.02
(3.88)
1.02
3.88)
1.02
3.88)
Boiler max. flow rate *4 GPM
(L/h)
6.2
(1400)
6.2
(1400)
6.2
(1400)
Max. operating pressure
at 210ºF (99ºC)
psig
(bar)
45
(3)
45
(3)
45
(3)
Boiler water temperature
- Adjustable high limit (AHL) range
space heating (steady state)
DHW production
- Fixed high limit (FHL)
ºF
(ºC)
ºF
(ºC)
ºF (ºC)
68 to 165
(20 to 74)
165
(74)
210 (99)
68 to 165
(20 to 74)
165
(74)
210 (99)
68 to 165
(20 to 74)
165
(74)
210 (99)
Boiler connections
Boiler heating supply and return
Pressure relief valve
Drain valve
Boiler supply/return for
indirect-fired DHW storage tank
(field supplied)
Gas valve connection
NPTM”
NPTF”
(male
thread)
NPT”
NPTF”
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
*1 Output based on 140ºF (60ºC), 120ºF (49ºC) system supply/return temperature.
*2 Net AHRI rating based on piping and pick-up allowance of 1.15.
*3 If the gas supply pressure exceeds the maximum gas supply pressure value, a separate gas pressure regulator
must be installed upstream of the heating system.
*4 See “Waterside Flow” starting on page 8 in this manual.

Vitodens 200-W, B2HB 19 to 35 Technical Data
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5461 883 - 02
Technical Data
5
Technical Data
Boiler Model No. 200-W B2HB 19 26 35
Dimensions
Overall depth
Overall width
Overall height
inches
(mm)
inches
(mm)
inches
(mm)
15.7
(400)
17¾
(450)
41
(1040)
15.7
(400)
17¾
(450)
41
(1040)
15.7
(400)
17¾
(450)
41
(1040)
Flue gas *5
Temperature (at boiler return
temperature of 86ºF (30ºC)
- at rated full load
- at rated partial load
Temperature (at boiler return
temperature of 140ºF (60ºC)
ºF (ºC)
ºF (ºC)
ºF (ºC)
113 (45)
95 (35)
154 (68)
113 (45)
95 (35)
154 (68)
113 (45)
95 (35)
154 (68)
Max. condensate flow rate *6
with natural gas and
TS/TR=122/86ºF (50/30ºC) USG/h
(L/h)
0.66
(2.5)
0.97
(3.7)
1.21
(4.6)
Condensate connection *7 hose
nozzle
Ø in ¾-1¾-1¾-1
Boiler flue gas connection *8 Ø
in (mm) 23/8(60) 23/8(60) 23/8(60)
Combustion air supply
connection (coaxial)
outer
Ø in (mm) 4 (100) 4 (100) 4 (100)
Sound Rating
- at maximum input
- at minimum input
dB
dB 41
35
48
36
51
36
*5 Measured flue gas temperature with a combustion air temperature of 68°F (20°C).
*6 Based on maximum input rate.
*7 Requires 1 inch (25 mm) tubing. See the Installation Instructions of the Vitodens 200-W, B2HB for details.
*8 For side wall vent installations (coaxial system):
Do not exceed max. equivalent length specified in the Installation Instructions of the Vitodens 200-W, B2HB
Venting System.
Do not attempt to common-vent Vitodens 200-W with any other appliance.
Side wall co-axial vent installation must include Viessmann protective screen!
For details refer to the Installation Instructions for the Vitodens 200-W, B2HB Venting System.
For information regarding other Viessmann System Technology componentry, please reference documentation
of respective product.
Note: For high altitude installation at 10,000 ft. the input for model B2HB 19 to 35 will have an altitude
de-ration of 21%.

Vitodens 200-W, B2HB 19 to 35 Technical Data
5461 883 - 02
6
Dimensional Information
Models 200-W, B2HB 19, 26, 35
Legend
ABoiler Supply
BGas Connection, ¾” NPTF
C Boiler Return
D Recommended height (single boiler system)
E Condensate drain
FCombustion air intake (left or right)
G Combustion air intake (through co-axial)

Vitodens 200-W, B2HB 19 to 35 Technical Data
7
5461 883 - 02
Minimum Clearances
7
Recommended Minimum Service Clearances
Minimum Clearances to Combustibles
AL= Alcove
CL= Closet
*1 Refer to the Installation Instructions of the Vitodens
200-W, B2HB Venting System for details.
Note:The Vitodens boiler has passed the zero inches
vent clearance to combustibles testing requirements
dictated by the Harmonized Standard ANSI Z21.13.
CSA 4.9.2000 and therefore is listed for zero
clearance to combustibles when vented with a
single wall special venting system (AL-29-4C
material). The zero inches vent clearance to
combustibles for the Vitodens boiler supercedes
the clearance to combustibles listing that appears
on the special venting system label.
Top Front Rear Left Right Vent
pipe *1
0 0 AL, CL 0 0 0 0

Vitodens 200-W, B2HB 19 to 35 Technical Data
5461 883 - 02
8
Typical System Flow Rates
Waterside Flow
Waterside Flow (primary circuit)
Boiler maximum flow rate 6.2 GPM (1400 L/h)
Boiler maximum flow rate 6.2 GPM (1400 L/h)
Boiler maximum flow rate 6.2 GPM (1400 L/h)
The Vitodens 200-W, B2HB is designed for closed loop,
forced circulation hot water heating systems only. Use
standard friction loss method for pipe sizing. Observe
boiler maximum and minimum flow rate limitations. If
system flow rate exceeds boiler maximum flow rate
(as stated above), falls below the minimum flow rate
or if system flow rate is unknown, Viessmann strongly
recommends the installation of a low-loss header.
An alternative method may be used, such as primary
secondary piping using closely spaced tees.
A low-loss header offers additional benefits not provided
by a pair of closely spaced tees. Viessmann therefore
strongly recommends and prefers the use of a low-loss
header over closely spaced tees. See pages 25 and 26
for low-loss header information. Once the low-loss header
is connected, the built-in low-loss header logic of the
Vitodens 200-W boiler ensures the required rt across the
system through the sensory communication between the
low-loss header and the boiler.
Model B2HB 26 1 boiler
Output (NG/LPG)
MBH 88
rt for NG/LPG
20ºF (11ºC) rise GPM (L/h) 8.8 (1999)
25ºF (14ºC) rise GPM (L/h) 7.0 (1599)
30ºF (17ºC) rise GPM (L/h) 5.9 (1332)
35ºF (19.5ºC) rise GPM (L/h) 5.0 (1142)
40ºF (22ºC) rise GPM (L/h) 4.4 (999)
Pressure drop (primary circuit) for
Vitodens 200-W, B2HB 19, 26, 35
For sizing an on-site circulation system.
Max. flow rate: 6.2 GPM (1400 L/h)
Model B2HB 19 1 boiler
Output (NG/LPG)
MBH 64
rt for NG/LPG
20ºF (11ºC) rise GPM (L/h) 6.4 (1453)
25ºF (14ºC) rise GPM (L/h) 5.1 (1163)
30ºF (17ºC) rise GPM (L/h) 4.3 (969)
35ºF (19.5ºC) rise GPM (L/h) 3.7 (830)
40ºF (22ºC) rise GPM (L/h) 3.2 (727)
Model B2HB 35 1 boiler
Output (NG/LPG)
MBH 117
rt for NG/LPG
20ºF (11ºC) rise GPM (L/h) 11.7 (2657)
25ºF (14ºC) rise GPM (L/h) 9.4 (2126)
30ºF (17ºC) rise GPM (L/h) 7.8 (1771)
35ºF (19.5ºC) rise GPM (L/h) 6.7 (1518)
40ºF (22ºC) rise GPM (L/h) 5.9 (1328)
Flow rate
Supply head pressure (water)

Vitodens 200-W, B2HB 19 to 35 Technical Data
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5461 883 - 02
System Flow Rates
9
Heating Circuit / Boiler Pumps
Viessmann offers a variety of Grundfos heating circuit/
boiler pumps which meet typical Vitodens system
installation requirements (see “Heating circuit pump
(field supplied)” or “Boiler pump (field supplied)” in the
Installation Examples starting on page 28). See tables
below for recommended pumps. Refer to the graph
on page 8 for the proper waterside boiler friction loss
calculations. The following pumps have been selected
based on boiler heat exchanger head loss and boiler piping
to a low-loss header.
IMPORTANT
Pump selection must be based on accurate system flow
and pressure drop calculations (includes DHW sizing).
Model B2HB 19 B2HB 26 B2HB 35
Flow rate
20ºF rt GPM (L/h) 6.4 (1453) -- --
25ºF rt GPM (L/h) 5.1 (1163) -- --
30ºF rt GPM (L/h) 4.3 (969) 5.9 (1332) --
35ºF rt GPM (L/h) 3.7 (830) 5.0 (1142) --
40ºF rt GPM (L/h) 3.2 (727) 4.4 (999) 5.9 (1328)
Flow limitation GPM (L/h) 6.2 (1400) 6.2 (1400) 6.2 (1400)
Recommended boiler pumps Grundfos UPS 15-58 (3-speed), Taco 0015, Wilo Star S 21 FX
Before using the following pumps for a DHW tank
application, find out the proper pressure drop through the
tank, the required temperature difference through the coil
and system piping head loss of the domestic hot water.
Low-Loss Header Application
Sizing of Low-Loss Header in a Residential Single-Boiler Application
*1For system rt < 20° F use low-loss header sizes for rt 20° F.
*2Low-Loss temperature sensor - is included with the boiler for use in a single boiler application.
Boiler
Model
No. of
Boilers
Boiler
Max.
Flow
Rate
GPM
(L/h)
Typical System Flow Rates Viessmann
Low-loss
Temp.
Sensor
Required*2
rt*1 °F
(°C)
20
(11.0)
25
(14.0)
30
(17.0)
35
(19.5)
40
(22.0)
B2HB
19
1 6.2
(1400)
System Flow
Rate
LLH Required
LLH Model
GPM
(L/h)
6.4
(1453)
Yes
80/60
5.1
(1163)
Optional
80/60
4.3
(969)
Optional
80/60
3.7
(830)
Optional
80/60
3.2
(727)
Optional
80/60
Included
B2HB
26
1 6.2
(1400)
System Flow
Rate
LLH Required
LLH Model
GPM
(L/h)
8.8
(1999)
Yes
80/60
7.0
(1599)
Yes
80/60
5.9
(1332)
Optional
80/60
5.0
(1142)
Optional
80/60
4.4
(999)
Optional
80/60
Included
B2HB
35
1 6.2
(1400)
System Flow
Rate
LLH Required
LLH Model
GPM
(L/h)
11.7
(2657)
Yes
80/60
9.4
(2126)
Yes
80/60
7.8
(1771)
Yes
80/60
6.7
(1518)
Yes
80/60
5.9
(1328)
Optional
80/60
Included

Vitodens 200-W, B2HB 19 to 35 Technical Data
5461 883 - 02
10
DHW Production
Domestic Hot Water Production
Legend
DR Boiler heating return for domestic hot water
production
DS Boiler heating supply for domestic hot water
production
HR Heating Return
HS Heating Supply
BD Boiler Drain
BR Boiler Return
BS Boiler Supply
GC Gas Connection
PRV Pressure Relief Valve
BF Boiler Fill
PG Pressure Gage (not shown)
*1See page 45 for alternate DHW connection.
*2Temperature guage
An adequately sized pre-charged expansion tank must be
used. See Installation Examples for details.
IMPORTANT
Vitodens 200-W boilers can be used in conjunction
with the stand-alone DHW storage tanks offered by
Viessmann.
All Viessmann DHW storage tanks sold in North America
are available in “Vitosilver” finish only.
Size and select the DHW storage tank based on the
forecasted DHW consumption of the building in question.
For further technical information on DHW storage tanks,
see the Vitocell-V Technical Data Manuals.
For the connection of a stand-alone DHW tank, installation
fittings (field supplied), an external circulating pump for
DHW production (field supplied) and a DHW temperature
sensor (optional equipment, see Viessmann Price List for
order information) are required.
Note:Install the temperature guage (supplied) anywhere
in the supply piping near the boiler (not shown).
*1DHW
Connections
(Field Supplied)
*2

Vitodens 200-W, B2HB 19 to 35 Technical Data
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5461 883 - 02
DHW Recirculation
Domestic Hot Water Recirculation
DHW recirculation lines increase the level of comfort and
convenience of the domestic hot water supply and reduce
water consumption.
These advantages directly derive from the immediate
availability of domestic hot water at all draw points.
Poor insulation of the DHW recirculation line, however,
can result in considerable heat loss. Viessmann therefore
recommends that effective insulation be provided and
used for DHW recirculation lines of 23 ft. (7 m) in length
or longer.
Vitocell-V stand-alone DHW storage tank
Legend
DCW Domestic Cold Water
DHW Domestic Hot Water
TPV Temperature and Pressure Relief Valve
(on tank - not shown)
R DHW Recirculation Line
RP DHW Recirculation Pump

Vitodens 200-W, B2HB 19 to 35 Technical Data
5461 883 - 02
12
Wall Mounting
Mounting Bracket
1. Remove the external accessories connection box
cover.
2. Loosen the screws at the bottom of the boiler
(do not remove completely).
3. Remove the front encloser panel (lift up and pull
away from the boiler).
4. Mount boiler onto the mounting bracket and connect
boiler to the installation fittings.
5. Ensure the boiler is securely mounted.
CAUTION
Whichever mounting method is used, ensure that the
bracket is tightly and securely fastened to wall. Failure
to secure boiler properly could cause boiler to loosen,
posing a severe safety hazard.
Fitting the wall mounting bracket
See the installation instructions applicable to the
mounting bracket on each type of material.
Models B2HB 19, 26, 35
CAUTION
The boiler must be level both vertically and horizontally
to ensure proper draining of the condensate.

Vitodens 200-W, B2HB 19 to 35 Technical Data
13
5461 883 - 02
Frame Mounting
Boiler Stand for B2HB 19 to 35
The boiler stand is used for free-standing installation of a
single boiler within the mechanical room.
When using the boiler stand, ensure that the stand is
securely fastened to the floor (recommended concrete
expansion anchors are Hilti model KB-TZ ex 4 or
equivalent.
The Vitodens 200-W, model B2HB does not come with
a mounting template. The wall location for the frame,
mounting bracket and all vents must be field calculated.
Boiler mounting bracket and frame
1. Attach the wall mounting bracket (supplied with the
boiler) to the boiler mounting frame using the supplied
hardware. Ensure that the wall mounting bracket is
level.
2. Move the rack into position and secure to the floor
(and to the wall if needed).

Vitodens 200-W, B2HB 19 to 35 Technical Data
5461 883 - 02
14
Frame Mounting
Models B2HB 19, 26, 35
1. Remove the external accessories connection box
cover.
2. Loosen the screws at the bottom of the boiler
(do not remove completely).
3. Remove the front encloser panel (lift up and pull
away from the boiler).
4. Mount boiler onto the mounting bracket and ensure
the boiler is securely mounted. Then install the
holding bracket to the frame on top of the boiler.
5. Connect the boiler to the installation fittings.
CAUTION
The boiler must be level both vertically and horizontally
to ensure proper draining of the condensate.

Vitodens 200-W, B2HB 19 to 35 Technical Data
15
5461 883 - 02
Condensate Connection/Neutralization Unit
Condensate Connection
Install the condensate drain pipe with a suitable gradient.
Discharge condensate from the boiler into the drainage
system, either directly or (if required) via a neutralization
unit (accessory).
Pipe ventilation must take place between the siphon trap
and the neutralization unit (if applicable).
Condensate Connection for Vitodens
200-W, models B2HB 19, 26, 35
IMPORTANT
Condensate Drainage and Neutralization
The condensate formed both in the condensing boiler
and in the flue gas pipe must be discharged into the
public sewage system in accordance with all applicable
local regulations. The condensate produced by a gas-fired
heating system has a pH value between 3 and 4.
Some local codes may require the use of a separate
neutralization unit to treat the aggressive and corrosive
nature of the condensate. With a neutralization unit
installed, all condensate from the boiler and the flue gas
pipe enters into the neutralization unit where it is treated
and released into the public sewage system with a safe
pH value of above 6.5.
The use of neutralization granulate (performing the
neutralizing process) is dependent on the operation of the
heating system. To determine the required refill amount,
check granulate level several times during the first year
of operation. In some cases one granulate fill may last
an entire year.
Contact Viessmann to order a neutralization unit for the
Vitodens 200-W boiler.
See Viessmann Price List for order information.
The condensate discharge outlet to the drainage system
connection must be clearly visible. It must be installed
with a suitable gradient and provided with a stench trap.
If the condensate outlet of the Vitodens 200-W boiler is
lower than the drain, a condensate pump must be used.
Only corrosion-resistant materials must be used for
condensate drainage purposes (e.g. braided hose).
Do not use galvanized materials or materials containing
copper for piping, couplings etc. The condensate drain
must have a trap to prevent flue gas leakage.
Please note that other requirements might apply
depending on local regulations and/or project-specific
details.
It is advisable to contact your local waterworks office
(authority responsible for waste water regulations)
well before commencing with the installation of the
neutralization unit in order to establish details of local
regulations that apply.
The following table shows the concentration of (effluent)
substances (e.g. heavy metals) contained in the waste
water from the Vitodens 200-W condensing boiler.
Condensate (effluent)
substances
Values measured in mg/L
Vitodens 200-W
Lead
Cadmium
Chromium
Copper
Nickel
Zinc
Tin
< 0.01
< 0.005
< 0.01
< 0.01
< 0.01
< 0.05
< 0.05

Vitodens 200-W, B2HB 19 to 35 Technical Data
5461 883 - 02
16
Venting Options/Electrical Connection/Control
Venting Options
For detailed information refer to the Installation Instructions for the Vitodens 200-W, B2HB Venting System.
Power Supply
The Vitodens 200-W requires a standard 120 VAC power
outlet 15A fuse protected circuit. Refer to the installation
instructions shipped with the boiler for wiring details, or
reference the “Overview of Electrical Connections” on
pages 38 and 39 of this manual.
Power Supply Connection of Accessories
The power supply connection of accessories can be made
directly at the boiler control. The connection is activated
and deactivated with the system on/off switch.
The mixing valve accessory kit and the Vitosolic control
(if used) will require a separate 120 VAC power supply
from the wall receptacle.
Wire cabling required for:
■Outdoor temperature sensor
■Vitotronic 200-H, HK1B mixing valve control
■Accessory kit for heating circuit with mixing valve
■Vitotrol 200 remote control
■Vitotrol 300 remote control
■Remote switching of operating mode
■Remote disable
■Alarm output
Vent Connection, (with optional
air intake openings on sides)
for models B2HB 19, 26, 35
Electrical Connections

Vitodens 200-W, B2HB 19 to 35 Technical Data
17
5461 883 - 02
Boiler Control
On-Board Vitotronic 200, HO1B Control
Modular structure
The control unit is integrated into the boiler. The control
unit comprises a standard unit, electronics modules and
a programming unit.
Standard unit:
■ON/OFF switch
■Optolink laptop interface
■Operating and fault indicators
■Reset button
■ Fuses
Programming unit:
■Easy operation through:
– Plain text display with graphic ability
– Large font and black & white depiction for good
contrast
– Context-sensitive help text
– Removable programming unit; can be mounted
on the wall with separate accessory
■With digital time switch
■Control keys for:
– Navigation
– Confirmation
– Help and additional information
– Menu
■Setting the:
– Room temperature
– Reduced room temperature
– DHW temperature
– Heating program
– Time programs for central heating, DHW heating
and DHW recirculation
– Economy mode
– Party mode
– Holiday program
– Heating curves
– Codes
– Actuator tests
– Test mode
■Displaying the:
– Boiler water temperature
– DHW temperature
– Operating details
– Diagnostic details
– Fault messages

Vitodens 200-W, B2HB 19 to 35 Technical Data
5461 883 - 02
18
Frost protection
■The frost protection function will be started when the
outside temperature drops below approx. 34°F (1°C).
With the frost protection function, the heating circuit
pump will be switched ON and the boiler water is
maintained at a lower temperature of approx. 68°F
(20°C).
The DHW tank will be heated to approx. 68°F (20°C).
■The frost protection function will be stopped when the
outside temperature rises above approx. 37°F (3°C)
(default settings).
Summer Operation
Heating program “w”
The burner is only activated upon a call for domestic hot
water from the DHW storage tank (controlled by DHW
tank temperature sensor).
Design and Function
Boiler Control
Control Characteristics
PI characteristics with modulating output.
Time Switch
Digital time switch.
■Individual and 7-day program
■Automatic daylight savings time changeover
■Automatic function for DHW heating and DHW
recirculation pump
■Time, day and standard switching times for space
heating, DHW heating and the DHW recirculation
pump are factory-set
■Switching times are individually programmable,
i.e. up to four switching periods per day
Shortest switching interval: 10 minutes
Power backup: 14 days.
Functions
■Weather-compensated control of the boiler water
and/or flow temperature
■Control of one heating circuit without mixer and two
heating circuits with mixer
■Control of one heating circuit without mixer and two
heating circuits with mixer
■Demand-dependent heating circuit pump and burner
off control
■Adjustment of a variable heating limit
■Anti-seizing pump protection
■Integral diagnostic system
■Maintenance display
■DHW temperature control with priority
■Control of solar DHW heating and central heating
backup in conjunction with the solar control module,
type SM1
■Display of the solar energy yield
■Auxiliary function for DHW heating (short-term
heating to a higher temperature)
■Slab curing program
■0-10V External signal input
Setting the Operating Programs
The heating system frost protection (see
frost protection function) applies to all heating programs.
You can select the following heating programs with the
program keys:
■Heating and DHW
■DHW only
■Standby mode
External heating program changeover.

Vitodens 200-W, B2HB 19 to 35 Technical Data
19
5461 883 - 02
Boiler Control
Design and Functions (continued)
Heating Curve Adjustment (slope and shift)
The control unit regulates the boiler water temperature
(= supply temperature of heating circuit without
mixing valve) and the supply temperature of the heating
circuit with mixing valve (in conjunction with the
accessory mixing valve extension kit) according to the
outdoor temperature. The boiler water temperature is
automatically raised by 0 to 72 F / 0 to 40 K higher than
the currently required set supply termperature (in the
factory default setting the differential temperature
is 14.4 F / 8 K). See Service Instructions for coding
address “9F” in coding level 2.
The supply temperature that is required to achieve a
given room temperature depends on the heating system
and the thermal insulation of the building that is being
heated.
The adjustment of the two heating curves is used to
match the boiler water temperature and the supply
temperature to these conditions. The boiler water
temperature is limited upwards by the fixed high limit
and the temperature set for the electronic high limit.
The supply temperature cannot rise above the boiler
water temperature.
Technical Data
Rated supply voltage: 120 VAC
Rated frequency: 60 Hz
Rated current: 12 A
Max. ambient temp.
- at operation: 32 to 104ºF (0 to 40ºC)
Installation in living spaces or
boiler rooms (standard
ambient conditions)
- when storing
or transporting: -4 to +158ºF (-20 to +70ºC)
Max. operating temp.
setting (space heating):
Models B2HB 19-35 165ºF (74ºC)
DHW production:
Models B2HB 19-35 165ºF (74ºC)
Setting fixed high limit: 210ºF (99ºC)
(not adjustable)
Adjustment range of
DHW tank set-point
temperature: 50 to 154ºF (10 to 68ºC)
Heating curve settings
- Heating curve slope: 0.2 to 3.5
- Heating curve shift: -12 to +33ºC
-13 to 40 K
Legend
ALow temperature heating system,
e.g. radiant floor heating
BMedium temperature heating system,
e.g. cast iron radiation, staple-up radiant floor heating
CHigh temperature heating system,
e.g. fintube radiation, fan coils
Boiler water or supply temperature
Room
set-point
temperature Outdoor temperature

5461 883 - 02
20
Vitodens 200-W, B2HB 19 to 35 Technical Data
Sensors (supplied)
Boiler Temperature Sensor
The boiler temperature sensor is connected at the control
unit for weather-responsive operation and is built into the
boiler.
Specification sensor type: Viessmann NTC 10K ohms
at 77ºF (25ºC)
Max. ambient temp.
- at operation: 32 to 266ºF (0 to 130ºC)
- when storing
or transporting: - 4 to+158ºF (-20 to+70ºC)
Outdoor Temperature Sensor
Sensor location:
- North or northwest wall of building
- 6.6 to 8.2 ft. (2 to 2.5 m) above ground or in case
of a multi-storey building approximately halfway up
the second floor
Electrical connection:
- 2-wire cable, max. cable length 115 ft. (35 m)
with a wire size of min. AWG 16 copper
- Cable to the outdoor sensor must not be laid near
line voltage wiring (120/240 V)
Max. ambient temp.
- at operation: 32 to 194ºF (0 to 90ºC)
- when storing
or transporting: - 4 to+158ºF (-20 to+70ºC)
DHW Tank Temperature Sensor
(immersion temperature sensor)
Supplied with:
- Cable length approx. 13 ft. (3.75 m), ready to plug in
- All pipe connections are field supplied.
Specification
Max. ambient temp.
- at operation: 32 to 194ºF (0 to 90ºC)
- when storing
or transporting: - 4 to+158ºF (-20 to+70ºC)
- Sensor type: Viessmann NTC
10K ohms @ 77ºF (25ºC)
Accessories
Immersion Temperature Sensor
To capture the low loss temperature
(if low-loss header is used)
Specification
Lead length fully wired: 12 ft. (3.75 m),
Permissable ambient temp.
- during operation: 32 to 194°F (0 to 90°C)
- when storing
or transporting: - 4 to+158° F (-20 to+70° C)