Viessmann Vitodens 100-W Instruction manual

VITODENS 100-W 
Gas-fired wall-mounted condensing boiler
37 to 118 MBH / 10.8 to 34.6 W
Vitodens 100-W
WB1B Series
Gas-Fired Wall-Mounted Condensing Boiler
with modulating stainless steel MatriX cylinder
burner and stainless steel Inox-Radial heat exchanger
for room air independent operation
(using a direct vent system) or room
air dependent operation
Technical Data Manual
Model Nos. and pricing: see Price List
Vitodens 100-W, WB1B
with preinstalled coaxial vent pipe adaptor)

This trademar is registered with the U.S. Patent and Trademar Office.
5369 277 v1.5 01/2010

Product Information
2
VITODENS 100-W
Equipped with a Viessmann stainless steel
heat exchanger for lasting performance and
reliability and a modulating MatriX cylinder
gas burner, the Vitodens 100-W
wall-mounted condensing boiler is the perfect
combination of value, quality and Viessmann
technology.
The benefits at a glance:
HOutstanding efficiency of 95.2 % A.F.U.E.
on all models.
HLasting performance
with Viessmann-made SA240 316Ti
stainless steel Inox-Radial heat exchanger
constructed to ASME Section IV and CSA
B51.
HLow-emission
with fully-modulating stainless steel
MatriX cylinder burner. Factory calibration
eliminates adjustments in the field.
< 29 ppm NOx(at 3% O2)
< 40 ppm CO (at 3% O2)
HControl variety
Integrated boiler control interfaces with
any level of external control - from room
thermostat to outdoor reset and more.
HCompact, lightweight design
and zero clearance to combustibles ma e
it a great choice for limited-space
installations.
HExtremely quiet operation;
quieter than most refrigerators.
< 50 dBA (at 1 meter / 3.3 ft.)
HEasy installation, service and maintenance
with all pipe connections located at the
bottom and serviceable components easily
accessible from the front.
HMultiple venting options
- Horizontal or vertical sealed combustion
coaxial vent system (factory supplied).
- Horizontal, vertical or hybrid sealed
combustion double-pipe vent system
(field supplied).
- Horizontal or vertical single-wall vent
system (field supplied).
HSuitable for high altitude levels
of up to 10,000 ft. / 3,000 m without
deration.
HBuilt-in automatic frost protection
allows boiler to be shut off for an
extended period of time while protecting it
against freeze-up.
HLimited lifetime warranty
in residential applications.
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Product Information
Cross-Section
3
Legend
Stainless steel MatriX cylinder burner
Inox-Radial stainless steel heat
exchanger
Burner blower
Gas and hydronic connections
Boiler control
Standard Equipment:
Wall-mount boiler and installation fittings
c/w 30 psi pressure relief valve, pressure
gage, gas shut-off valve, two fill/drain
valves, all mounting hardware, outdoor
temperature sensor, and LP conversion it.
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C
DE
B
A
Product may not loo exactly as illustrated.

Technical Data
4
Technical Data
Standard heating boiler
Boiler Model Model No. WB1B 26 WB1B 35
Natural gas and LPG
CSA input
CSA output/DOE*1
heating capacity
MBH
W
MBH
W
37-91
10.8-26.7
34-83
9.9-24.3
37-118
10.8-34.6
34-108
9.9-31.6
Net I=B=R rating*2 MBH 72 94
Heat exchanger surface area ft.2
m2
10.23
0.86
10.23
0.86
Min. gas supply pressure
Natural gas
LPG
“w.c.
“w.c.
4
10
4
10
Max. gas supply pressure*3
Natural gas and LPG “w.c. 14 14
A.F.U.E. %94.0 94.0
Weight lbs
g
78
34.1
78
34.1
Shipping weight lbs
g
95
43
95
43
Boiler water content USG
ltr
0.87
3.3
0.87
3.3
Boiler max. flow rate*4 GPM
ltr/h
6.2
1400
6.2
1400
Max. operating pressure
at 210ºF / 99ºC
psig
bar
45
3
45
3
Boiler water temperature
– Adjustable high limit (AHL) range
– space heating (steady state)
– DHW production (set-point)
– Fixed high limit (FHL)
ºF / ºC
ºF / ºC
ºF / ºC
86 to 176 / 30 to 80
172 / 78
210 / 99
Boiler connections
Boiler heating supply and return NPTM (male) “
Pressure relief valve NPTF (female) “
Drain valve (male thread)
¾
¾
¾
¾
¾
¾
Dimensions
Overall depth
Overall width
Overall height
inches
mm
inches
mm
inches
mm
141/8
360
15¾
400
28½
725
141/8
360
15¾
400
28½
725
*1 Output based on 140ºF / 60ºC, 120 ºF / 49ºC system supply/return temperature.
*2 Net I B R 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 “Maximum Flow Rates” on pages 15 to 17 in this manual.
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Vitodens 100-W
5
Standard heating boiler
Boiler Model Model No. WB1B 10-26 WB1B 10-35
Gas supply connection NPTF “ ¾ ¾
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
127 / 53
90 / 32
167 / 75
131 / 55
90 / 32
172 / 78
Flue gas value
Mass flow rate (of flue gas)
– at rated full load
– at rated partial load
Available draught
lbs/h
g/h
lbs/h
g/h
Pa
mbar
79.2
36.0
33.0
15.0
100
1.0
100.1
45.5
33.0
15.0
100
1.0
Flue gas temperature sensor
limit ºF / ºC 230 / 110 230 / 110
Average condensate
flow rate*6
with natural gas
– TS/TR=122/86ºF / 50/30 ºC USG/day
ltr/day
1.95-2.3
8-9
2.5-2.8
9.4-10.5
Condensate connection*7 hose
nozzle
∅in 1 1
Boiler flue gas connection*8 ∅
in/mm 23/8/60 23/8/60
Combustion air supply
connection*8
outer
∅in/mm 4/100 4/100
Noise level at 1 meter)
– at full load
– at partial load
(dB)
(dB)
47
40
49
42
High altitude factory set)*9
ft. / m 0-5,000 / 0-1,500 0-5,000 / 0-1,500
*5 Measured flue gas temperature with a combustion air temperature of 68°F / 20°C.
*6 Based on typical boiler cycles, including partial load conditions.
*7 Requires 1” / 25 mm tubing. See Vitodens 100-W Installation Instructions for details.
*8 For an overview of venting options refer to the appendix starting on page 19. For detailed information refer to the Vitodens Venting
System Installation Instructions.
*9 For 5,000 to 10,000 ft / 1,500 to 3,048 m operation, a coding address change is required. Refer to the Installation and Service
Instructions for details.
"For information regarding other Viessmann System Technology componentry, please reference documentation of respective product.
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Vitodens 100-W
6
Vitodens 100-W, WB1B 26/35
without piping connections
Connections Vitodens 100-W,
WB1B 10-26, 10-35
Legend
Connections
Condensate drain, plastic hose
Ø 1” / 25mm
Boiler water supply, NPT ¾” (male
thread)
Gas connection, NPT ¾” (male thread)
Boiler water return, NPT ¾” (male
thread)
ECombustion air opening for double pipe
system
FCombustion air opening for co-axial
system
Dimensions
a See fig. 2 for dimensions
b 15¾” / 400 mm
c 25/8” / 68 mm
d 28½” / 725 mm
e 47/8” / 123 mm
f 61/8” / 156 mm
g 141/8” / 360 mm
h 5” / 125 mm
j 97/8” / 250 mm
11/4” / 31 mm
m 77/8” / 200 mm
n 31/8” / 80 m
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a
b
ee
f
g
h
B
A
DC
nn
m
E F E
j
c
d
Fig. 1 Front view Top view
Side view

Vitodens 100-W
7
Vitodens 100-W, WB1B 26/35
with piping connections
Piping connections for Vitodens
100-W, WB1B 10-26 and 10-35
factory supplied)
Legend
BWR Boiler water return, ¾”
BWS Boiler water supply, ¾”
BD Boiler drain
BF Boiler fill
GC Gas connection, ¾” NPTM
(male thread)
PRV Pressure relief valve
PG Pressure gage
VC Venting connection
CAI Combustion air inlet connection
(optional)
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14” /
355mm
15¾” /
400mm
2
7
/
8
” / 73mm
12” / 300mm
2
5
/
8
”/
68 mm
6” /
152mm 4
7
/
8
” /
123mm
4
7
/
8
” /
123mm
VC
CAI CAI
PG
Fig. 2
28½” / 725 mm
32½” / 826 mm
PRV
BD
GC BF
BWS
BWR
Fig. 3

Vitodens 100-W/Technical Data
8
Recommended Minimum Service Clearances Minimum Clearances to Combustibles
Top Front Rear Left Right Vent pipe*1
0 0 AL,
CL
0 0 0 0
AL Alcove
CL Closet
*1Refer to the Installation Instructions of the
Vitodens Venting System for details.
Note:
The Vitodens 100-W boiler has passed the
zero inches vent clearance to combustibles
testing requirements provided by the boiler
Harmonized Standard ANSI Z21.13. CSA
4.9.2005 and therefore is listed for zero
clearance to combustibles when vented
with a single wall special venting system
(AL-29-4C material) or UL/ULC-listed CPVC
gas vent material. The zero inches vent
clearance to combustibles for the Vitodens
100-W boiler supercedes the clearance to
combustibles listing that appears on the
special venting system label.
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Front
12”/305 mm
Top
12”/305 mm
0”/mm
28”/700 mm
Side
0”/mm
Bac
Side
Fig. 4
12”/300 mm*1
4”/100 mm
28”/
700 mm
¼”/5 mm ¼”/5 mm¼”/5 mm
Fig. 5

Technical Data/Heating Circuit Pumps
9
Waterside Flow boiler circuit)
The Vitodens 100-W is designed only for closed loop, forced
circulation hot water heating systems.
Pressure drop primary circuit) of Vitodens 100-W
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 on page 13) or if system flow rate is unknown, Viessmann strongly
recommends the installation of a low-loss header. See page 13 for low-loss header information.
Heating Circuit Pumps
Recommended heating pumps with Vitodens 100-W, WB1B 10-26, 10-35:
HGrundfos 15-58 (3-speed)
HTaco 00R
or equivalent
Refer to the graph above for the proper
waterside boiler friction loss calculations.
Pump selection must be based on accurate
system flow and pressure drop calculations
incl. DHW sizing).
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0 500 1000 1500
0
1
2
3
4
5
6
0
3.3
6.6
9.8
13.1
16.4
19.7
ft.
2000 ltr. / hr.
7
8
23
26
Flow rate (USGPM)
Supply head pressure (ft. water)
0 2.2 4.4 6.6 8.8 GPM
m
A low-loss header must be used when the system flow
rate exceeds the maximum or falls below the minimum
flow rate of the Vitodens 100-W boiler. 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 strongly recommends and
prefers the use of a low-loss header over closely spaced
tees.
Please see page 13 for details.
IMPORTANT

DHW Production/Wall Mounting
10
Domestic Hot Water Production via DHW Storage Tank
Vitodens 100-W boilers can be used in
conjunction with the stand-alone DHW
storage tan s offered by Viessmann (a
separate DHW controller should be field
supplied). All Viessmann DHW storage
tan s sold in North America are available in
“Vitosilver” finish only.
Size and select the DHW storage tan based
on the forecast DHW consumption of the
building in question.
For further technical information on DHW
storage tan s, see the Vitocell-V Technical
Data Manuals.
Wall Mounting Information
The Vitodens 100-W (model WB1B 10-26
and 10-35) comes with a template, which
allows you to easily mar the location of the
screws for the mounting brac et and the
location of the flue gas pipe on the wall
(Viessmann coaxial PPS vent system only).
The connection to the heating circuits must
be made on site (installation fittings are
supplied in the Installation Fittings pac age
supplied with the boiler).
Legend
Mounting template
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Fig. 6

Condensate Connection/Neutralization Unit
11
Condensate Connection
Install the condensate drain pipe (Ø 7/8” /
22mm) with a suitable gradient (min. 2.5%).
Discharge condensate from the boiler into
the drainage system, either directly or (if
required) via a neutralization unit
(accessory).
Condensate connection for Vitodens 100-W
Hmodel WB1A 8-24, 8-30
The condensate drain of the Vitodes 100-W
boiler is equipped with a built-in siphon trap
in order to eep flue gases from being
discharged via the condensate drain.
Discharge tubing
Pipe ventilation must take place between
the siphon trap and the neutralization unit if
applicable).
Condensate Drainage and Condensate 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 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, chec 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 100-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 100-W boiler is lower than the
drain, a condensate pump must be used.
Only corrosion-resistant materials may 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
lea age.
Please note that other requirements may
apply depending on local regulations and/or
project-specific details.
It is advisable to contact your local
waterwor s 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 100-W condensing boiler.
Condensate
(effluent)
s
u
b
s
t
a
n
c
e
s
Values measured
in mg/ltr
(
e
f
f
l
u
e
n
t
)
substances Vitodens 100
Lead
Cadmium
Chromium
Copper
Nic el
Zinc
Tin
< 0.01
< 0.005
< 0.01
< 0.01
< 0.01
< 0.05
< 0.05
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Fig. 7
IMPORTANT

Venting Options / Electrical Connection
12
Vitodens 100-W Venting Options
For an overview of venting options refer to the appendix starting on page 19. For detailed
information refer to the Vitodens Venting System Installation Instructions.
Electrical Connection
All electrical connections are made to the
boiler’s integrated power pump module (120
VAC/60 Hz). Use disconnect means and
power service switch as per local code
requirements.
Control Unit
Function and construction
The control is integrated into the Vitodens
100-W boiler.
HIntegrated diagnostic system
HFor room temperature-dependent
operation, an external control or a room
temperature thermostat may be connected
HTo control DHW temperature, a separate
DHW controller may be connected
HExternal heat demand
H0-10 V (field wiring)
HViessmann outdoor temperature sensor
(field wiring)
HOpen Therm (field wiring)
The control unit consists of:
HLCD Display
HSelector dial for boiler water temperature
adjustment
HSelector dial for service setting
HTemperature adjustable high limit
HBoiler temperature sensor
HBurner fault display
HBurner fault reset
HPressure gage
HFuse
Boiler temperature sensor
The boiler temperature sensor is connected
to the control unit and built into the boiler.
Frost protection
Frost protection is continuously active. The
burner is switched ON when the boiler
water temperature reaches 41°F / 5°C and
is switched OFF again when the boiler water
temperature reaches at least 59 °F / 15°C
(but not more than 68°F / 20°C).
For details on the control, please
refer to the Vitodens 100-W
Operating Instructions.
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Vitodens 100-W Accessories
13
Accessories for the Vitodens 100-W
Neutralization Unit for Single-Boiler
Applications
with neutralizing granulate
for Vitodens 100-W, WB1B 10-26, 10-35
Part No. 7134 231
Low-Loss Header
–Type 80/50
Part No. 7134 791
(max. flow rate 17.6 GPM / 4 m3/h)
–Type 120/80
Part No. 7134 792
(max. flow rate 35.2 GPM / 8 m3/h)
A low-loss header offers additional benefits
not provided by a pair of closely spaced
tees. Viessmann strongly recommends and
prefers the use of a low-loss header over
closely spaced tees. When used in
conjunction with the Vitodens 100-W boiler,
the low-loss header acts as hydraulic brea ,
decoupling boiler and system circuits from
each other (no sensor required). It is
recommended to use the low-loss header in
applications in which the total system flow
rate exceeds the maximum or falls below
the minimum flow rate of the Vitodens
100-W boiler. For maximum boiler flow
rates, see the table on page 9 in this
manual.
Viessmann strongly recommends the use of
a low-loss header in cases where the
system head and flow rates are un nown.
In addition, the low-loss header helps
eliminate air and debris [D] from the heating
system. See Fig. 10 and 11 for an
illustration of the principle of operation.
Product does not look exactly as illustrated.
The low-loss header is available in the
following sizes. Select the size based on the
maximum system flow rate of your
application.
Model No. Max. system flow rate
Type 80/50 17.6 GPM / 4 m3/h
Type 120/80 35.2 GPM / 8 m3/h
Legend
AB Air Bleed
BR Boiler Return
BS Boiler Supply
BY Bypass (with laminar flow)
D Debris and/or air
DV Drain Valve
SR System Return
SS System Supply
TS Viessmann Temperature Sensor (not
used)
SW Sensor Well
T1 Boiler supply temperature
T2 Boiler return temperature
T3 System supply temperature
T4 System return temperature
Vprimary Boiler circuit flow rate
Vsecondary Heating circuit flow rate
Vbypass Bypass flow rate
Qprimary Heat supplied by boiler
Qsecondary Heat consumed by system
Vprimary < Vsecondary
T1 > T3
T2 = T4
Qprimary = Qsecondary
T1 ±176°F / 80°C
Vsecondary=Vprimary+Vbypass
When installing a low-loss header, system
mixed supply temperature T3) must be
calculated as follows:
T3=T1 ×V
primary
+T4 V
bypass
V
secondary
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310 mm DN 40
145 mm
Fig. 8
Fig. 9
DV
BS
SS
SR
BR
TS
BY
AB
D
SW
Fig. 10 Low-loss header design
T1
T2
Vprimary Vsecondary
T3
T4
T4Vbypass
Fig. 11 Principle of Operation
IMPORTANT

Standard Equipment/How the Vitodens 100-W Operates.../
Installation Examples
14
Standard Equipment
The Vitodens 100-W gas-fired condensing
boiler with Inox-Radial heat exchanger
surfaces, modulating stainless steel MatriX
cylinder gas burner
c/w
Hinstallation fittings with 30 psig
pressure relief valve, air vent and
pressure gauge
Htwo fill/drain valves
Hall mounting hardware
The boiler comes fully piped and prewired.
Venting material coaxial) is to be
supplied by Viessmann only. Side wall
vent installations must include Viessmann
protective screen!
Wall mounting componentry
The following wall mounting components
are supplied with the Vitodens 100-W
boiler:
HMounting brac et
HMounting bolts
HInstallation fittings
HScrews for mounting brac et on
– wood studs (2” x 4”)
– metal studs
– bric /concrete wall
How the Vitodens 100-W boiler
operates...
The Vitodens 100-W boiler uses a premix
combustion system, which is designed to
deliver a certain air-gas mixture to the
burner for complete combustion. The gas
is injected upstream of the blower. The
burner and heat exchanger are part of a
forced-draft design.The benefits of
forced-draft systems are lower
component temperatures, direct air-fuel
connection (premix) for improved mixing,
and longer service life of the boiler due to
mild to moderate ambient conditions.
The MatriX cylinder burner, blower and
the combination gas valve are factory
calibrated and pre-adjusted. A pneumatic
lin between combustion air and gas
flows guarantees optimal boiler
performance at all firing rates. Blower
speed is automatically increased or
decreased based on heat demand,
thereby regulating the amount of
combustion air drawn. The pneumatic lin
between air and gas introduces the
required amount of gas for optimal
combustion to meet the current heat
demand, based on a linear relationship
between ∆
∆∆
∆P air and ∆
∆∆
∆P gas.
Installation Examples
The examples on the following pages
depict possible piping layouts of the
Vitodens 100-W boiler.
Please note that the following examples
are simplified conceptual drawings only!
Piping and necessary componentry must
be field verified. A low water cut-off
LWCO) must be installed where required
by local codes. Proper installation and
functionality in the field is the
responsibility of the heating contractor.
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IMPORTANT

Installation Examples
15
System Layout 1
Vitodens 100-W, WB1B 10-26, 10-35 with one heating circuit
System Layout 1 - Alternate Option
Legend
AV Air vent
PRV Pressure relief valve
Vitodens 100-W
Room thermostat
Heating circuit
Heating circuit pump (field
supplied)
Expansion tan
Pressure Activated By-Pass
Please note:
Heating circuit Cin the examples should
be designed to 30ºF to 40ºF / 16.7ºC to
22.2ºC. For lesser delta T design, system
layout designer must use one of the
examples (3 or 4) on the following pages.
Ensure that a pressure activated
by-pass is installed if there are system
component s) in Cthat may isolate
the flow to the pump D.
Please note!
The use of a low-loss header is
recommended if the water flow rate is
less than 1.7 GPM / 400 ltr/h or more
than 6.2 GPM / 1400 ltr/h.
The low-loss header is available as
accessory part.
Maximum Flow Rates
Model WB1B 10-26 10-35
∆
∆∆
∆t
Output Btu/h 83,000 108,000
30 ºF rise (GPM) 5.5 ----
35 ºF rise (GPM) 4.7 6.2
40 ºF rise (GPM) 4.2 5.4
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PRV
AV
*


Fig. 12
F
T--T
PRV
AV
*
F
i
g
.
1
3


F
T--T
IMPORTANT

Installation Examples
16
System Layout 2
Vitodens 100-W, WB1B 10-26, 10-35 with...
– DHW storage tan
– low-loss header
– one heating circuit
Primary pump must pump into
the boiler as illustrated).
AV Air vent
PRV Pressure relief valve
TPV Temperature and pressure relief
valve
Vitodens 100-W gas-fired
condensing boiler
External boiler/DHW controller (field
supplied)
Heating circuit
Heating circuit pump (field supplied)
DHW storage tan
DHW tan temperature aquastat or
sensor
DHW circulating pump (field
supplied)
Low-loss header
Expansion tan
Primary pump (boiler circuit, field
supplied) with low-loss header only
Please note!
The use of a low-loss header is
recommended if the water flow rate is
less than 1.7 GPM / 400 ltr/h or more
than 6.2 GPM / 1400 ltr/h.
The low-loss header is available as
accessory part.
Maximum Flow Rates
Model WB1B 10-26 10-35
∆
∆∆
∆t
Output Btu/h 83,000 108,000
30ºF rise (GPM) 5.5 ----
35ºF rise (GPM) 4.7 6.2
40ºF rise (GPM) 4.2 5.4
DHW supply and return piping between boiler DHW connections and the Viessmann DHW tank connections, shall be a minimum of
1” nominal pipe diameter irrespective of the ¾” DHW connection outlet sizes provided on the boiler and the DHW tank). This
ensures that the head of the pump is fully utilized to overcome the resistance of the DHW heat exchanger coil and to provide
sufficient water flow to the boiler heat exchanger. In non-Viessmann DHW tank applications, perform, in addition to the above,
accurate calculations for DHW tank coil pressure drop versus boiler pump head to ensure sufficient water flow to the boiler heat
exchanger. Failure to heed the above instructions may cause boiler short-cycling and inadequate DHW supply.
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AV
PRV
TPV
Y
Y

Fig. 14

IMPORTANT
IMPORTANT

Installation Examples
17
System Layout 3
Vitodens 100-W, WB1B 10-26, 10-35 with DHW storage tan and one heating circuit
Primary pump must pump into
the boiler as illustrated).
AV Air vent
PRV Pressure relief valve
TPV Temperature and pressure relief
valve
Vitodens 100-W gas-fired
condensing boiler
External boiler/DHW controller (field
supplied)
Heating circuit
Heating circuit pump (field supplied)
DHW storage tan
DHW tan temperature aquastat or
sensor
DHW circulating pump (field
supplied)
Closely spaced tees, 4xpipe Ø
or 12” / 305mm*
Expansion tan
Primary pump (boiler circuit, field
supplied) with low-loss header only
*A low-loss header offers additional
benefits not provided by a pair of
closely spaced tees. Viessmann strongly
recommends and prefers the use of a
low-loss header over closely spaced tees.
Please see page 13 for details.
Please note!
The use of a low-loss header is
recommended if the water flow rate is
less than 1.7 GPM / 400 ltr/h or more
than 6.2 GPM / 1400 ltr/h.
The low-loss header is available as an
accessory part.
Maximum Flow Rates
Model WB1B 10-26 10-35
∆
∆∆
∆t
Output Btu/h 83,000 108,000
30 ºF rise (GPM) 5.5 ----
35 ºF rise (GPM) 4.7 6.2
40 ºF rise (GPM) 4.2 5.4
DHW supply and return piping between boiler DHW connections and the Viessmann DHW tank connections, shall be a minimum of
1” nominal pipe diameter irrespective of the ¾” DHW connection outlet sizes provided on the boiler and the DHW tank). This
ensures that the head of the pump is fully utilized to overcome the resistance of the DHW heat exchanger coil and to provide
sufficient water flow to the boiler heat exchanger. In non-Viessmann DHW tank applications, perform, in addition to the above,
accurate calculations for DHW tank coil pressure drop versus boiler pump head to ensure sufficient water flow to the boiler heat
exchanger. Failure to heed the above instructions may cause boiler short-cycling and inadequate DHW supply.
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AV
PRV
TPV
Y
Y
4xpipe Ø
or 12” / 305mm

Fig. 15
IMPORTANT
IMPORTANT

18
System Design Considerations
IN THE COMMONWEALTH OF MASSACHUSETTS...
-this product shall be installed by a licensed plumber or gas fitter.
-the flexible connector (if used) may not exceed 36”.
-any level type shutoff used must be of tee handle type.
Boiler location
As a direct vent appliance, the
Vitodens 100-W may be installed for room
air independent operation (sealed
combustion) regardless of size and ventilation
method of the room in which it is located.
The Vitodens 100-W may be installed, for
example, in the main living area of a house,
in non-ventilated utility rooms, cupboards,
closets and alcoves with no clearance
required from combustible materials, as well
as in attics with a direct outlet for the flue
gas/fresh air system. Follow all local and
national codes.
Flue gas system
Viessmann coaxial PPS (Polypropylene -
flame retardent) concentric flue gas/fresh air
systems and two-pipe stainless steel/CPVC
systems for room air independent operation
(sealed combustion) and side wall venting
are tested to ANSI Z21.13 - CSA 4.9 -
2007 standards and are certified together
with the Vitodens 100-W boiler as a
constructional unit. The Vitodens 100-W
boiler may also be vented vertically or
horizontally, using a metallic AL29-4C®
special stainless steel, or non-metallic CPVC
single-wall, room air dependent venting
system (UL/ULC listed for category IV).
For a more detailed description of the direct
vent and single-wall vent system, please
refer to the Vitodens Venting System
Installation Instructions.
Flue gas temperature protection
Viessmann coaxial PPS (Polypropylene -
flame retardent) flue pipes used for the
Vitodens 100-W are rated for max. flue gas
temperatures of up to 248 °F/120 °C.
Flue gas temperature protection is also
included although the maximum permissible
flue gas temperature will not be exceeded in
any operating condition or in the event of
malfunctioning.
Low water cut-off
A low water cut-off may be required by
local codes. If the boiler is installed above
the radiation level, a low water cut-off
device of approved type must be installed in
all instances. An approved low water cut-off
device that meets government and local
regulations must be provided by the heating
contractor. Do not install an isolation valve
between the boiler and the low water
cut-off. The Vitodens 100-W boiler has a
built-in flow switch, which may be accepted
by local codes in lieu of a low water cut-off.
System layout
HThe max. boiler water temperature for ...
–space heating is 180°F / 82°C.
–DHW production is 172°F / 78°C.
To minimize distribution losses,
Viessmann recommends that the heating
and domestic hot water systems be based
on a maximum boiler supply temperature
of 158 °F/70 °C.
HDue to the low return temperatures
required for gas condensing, avoid the use
of mixing valves in the heating circuit
whenever possible. If mixing valves are
required, e.g. for multi-circuit systems or
underfloor heating systems, only 3-way
mixing valves may be used.
Do not use 4-way mixing valves in a
system with condensing boilers.
Water connections
Vitodens 100-W boilers can be used in any
fully pumped hot water heating system.
Minimum system pressure is 0.8 bar/12 psig.
Chemical corrosion protection products
Corrosion does not typically occur in sealed
heating systems which have been correctly
installed and are correctly operated.
Many manufacturers of plastic pipes
recommend the use of chemical additives.
In this case, only commercially available
corrosion protection products that have
been approved for boilers with domestic hot
water heating via single-wall heat
exchangers (instantaneous plate heat
exchangers or DHW tan s) may be used.
Underfloor heating systems
For underfloor heating systems Viessmann
recommends the use of plastic tubing with
an oxygen diffusion barrier in order to
prevent the diffusion of oxygen through
tubing. If plastic tubing without an oxygen
diffusion barrier is used in underfloor
heating systems, Viessmann recommends
that such systems be separated from the
boiler with a heat exchanger.
Oxygen diffusion barrier
underfloor tubing
The boiler warranty does not cover lea s
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.
Water quality
Treatment for boiler feed water should be
considered in areas of nown 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 bac flow preventer within the
automatic water feed and influence
components such as diaphragm expansion
tan s, radiation, etc. Maximum antifreeze
content is 50% for the Vitodens 100-W
boiler. Do not use antifreeze other than
specifically made for hot water heating
systems. The system may also contain
components which might be negatively
affected by antifreeze. Chec 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 a
MSDS (Material Safety Data Sheet) for the
antifreeze used to the system
operator/ultimate owner.
Warranty
Our warranty does not cover damages
resulting from the following:
– installation or service by unqualified and
unlicensed personnel.
– attempting to perform any repair wor on
the boiler other than that mentioned in the
boiler literature.
– tampering with or attempting to readjust
the factory settings of the combination
gas valve
– lea s resulting from corrosion caused by
the use of underfloor plastic tubing
without an oxygen diffusion barrier.
For detailed warranty information, please
read warranty sheet supplied with product.
5369 277 v1.5

Appendix
19
Vitodens 100-W Venting Alternatives
Venting Alternatives Vent System Diameter
Viessmann Coaxial PPs Vent 1Stainless Steel Vent 2CPVC Vent 3Type
Max. Equivalent Length EqL) 60/100 80/125 100/150 3” 4” 2” 3” 4” Diameter
Horizontally Vented EqL 82 / 25 98 / 30 118 / 36 164 / 50 200 / 61 86 / 26 164 / 50 200 / 61 ft. / m
Vertically Vented EqL 82 / 25 98 / 30 118 / 36 164 / 50 200 / 61 86 / 26 164 / 50 200 / 61 ft. / m
See Page(s) 20-21 22-23 24-25 Page
Horizontal Intake /
Vertically Vented EqL — — — 164 / 50 200 / 61 —164 / 50 200 / 61 ft. / m
See Page(s) 26 26 Page
Select vent material based on vent configuration, preferred material, and necessary
maximum equivalent length.
Always follow Viessmann venting installation instructions.
- Do not common vent Vitodens 100-W with any other appliance.
- Layouts on the following pages are for illustrative purposes only.
- Do not use Price List for installation purposes. This is not a design tool.
1Sealed combustion, coaxial vent material to be supplied by Viessmann only.
2Stainless steel vent material must be ULC/UL listed, stainless steel AL29-4C® for Category IV boilers.
Suggested sources: Flexmaster Canada Ltd. / Z-Flex (US) Inc., Heat-fab, ProTech Systems Inc., or Security Chimneys Int’l.
3CPVC vent material must be ULC/UL listed, for Category IV boilers. Suggested source: IPEX Inc.
"
Boiler standard working pressure: 30 psig; maximum: 45 psig. For 45 psig, order optional PRV 9549 944.
"
Do not include first 90° elbow in equivalent vent length calculations (this applies to all vent materials).
Standard Equipment:
Wall-mount boiler and installation fittings c/w 30 psig
pressure relief valve, pressure gage, gas shut-off
valve, two fill/drain valves, all mounting hardware,
outdoor temperature sensor, and LP conversion it.
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Appendix
20
Coaxial PPs Vent System
Vent System 1Vent System Diameter
V
e
n
t
S
y
s
t
e
m
60/100 80/125 100/150 Diameter
Horizontally Vented Maximum Equivalent
Length (EqL)
82 / 25 98 / 30 118 / 36 ft. / m
Room Air
Independent Operation Basic Horizontal Vent Kit
Venting pieces can be ordered
individually, or as a convenient
it using the Order No. to the
right; Basic Vent Kit includes
one of each of the items num-
bered 2to 5, and two
Mounting Clips 6.
7424 119 — — Order No.
1Boiler Vent Pipe Adaptor
60/100
included with boiler
B
A
A
Adaptor, coaxial
60/100 to 80/125
(not shown)
Adaptor, coaxial
60/100 to 100/150
(not shown)
—
—
7424 112
—
—
7424 113
Order No.
Order No.
290° Elbow
EqL=1.6ft. / 0.5m
7424 094 7424 095 7424 096 Order No.
C
o
m
b
u
s
t
i
o
n
A
i
r
I
n
t
a
e
A
3Straight Pipe 2
3.3ft. / 1m
7424 091 7424 092 7424 093 Order No.
C
o
m
b
u
s
t
i
o
n
A
i
r
I
n
t
a
e
Flue Gas Outlet
B
A
4Vent Termination
2.6ft. / 0.8m
7424 100 7424 101 7424 102 Order No.
5Protective Screen 17134 237 Order No.
6Mounting Clip 2(each) 7424 109 7424 110 7424 111 Order No.
Other Available Vent Pieces
not shown in illustration above
Sliding Coupling
1.25ft. / 0.4m
7424 106 7424 107 7424 108 Order No.
Straight Pipe 2
1.6ft. / 0.5m
7424 088 7424 089 7424 090 Order No.
45° Elbow (Set of 2)
EqL=1.0ft. / 0.3m
7424 097 7424098 7424 099 Order No.
1PPs coaxial vent material must be ULC S-636 certified for Category IV boilers. Do not mix non-ULC S-636 with ULC S-636 venting.
Side wall venting installation must include Viessmann Protective Screen!
2Order 1Mounting Clip for each straight length of vent pipe installed.
"
Do not include first 90° elbow in equivalent vent length calculations (this applies to all vent materials).
"
Amaximum of 5elbows may be installed in the vent system; do not exceed maximum equivalent vent length.
"
Always follow Viessmann venting installation instructions 5368 815.
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