Viessmann Vitocell 200 Cylinder User guide

Design, Installation,
User & Servicing
Instructions
An unvented hot water storage
appliance complying with the
requirements of Building Regulations
Approved Document G3 and
manufactured in accordance with
BS EN 12897, the specication for
unvented water storage vessels.
In the interest of continuously
improving the Vitocell 200 Cylinder
range, Viessmann reserve the right to
modify the product without notice, and
in these circumstances this booklet,
which is accurate at the time of printing,
should be disregarded.

Page 2
Section Page
DESIGN
Description 3
Technical Data 6
System Details 8
INSTALLATION
Installation 10
Commissioning 20
USER INSTRUCTIONS 21
SERVICING
Servicing and Maintenance 22
Fault Finding 23
Spare Parts List 26
ADDENDIX
Addendix A 27
Addendix B 28
Notes 29
BENCHMARK
Commissioning Checklist 30
Service Record 31
ISSUE 22: JANUARY 2016
These instructions should be read in conjunction with the installation/servicing
instructions issued by the manufacturer of the heat source being used.
Any installation must be in accordance with the relevant requirements of the Gas
Safety Regulations, Building Regulations, I.E.E. Wiring Regulations and the Water Fitting
Regulations (England and Wales) or Water Byelaws (Scotland). It should be read in
accordance with the relevant recommendations of the following:
BS 6798; BS EN 12828, BS EN 12831, BS EN 14336; BS 5546;
BS 5440:1; BS 5440:2; CP 331:3
BS EN 806-1 to 5, BS EN 8558:2011: BS EN 1458-1:2011 and BS 7593:2006
Viessmann Vitocell 200 Cylinder is covered by Section G3 of the Building Regulations
(England and Wales) Technical Standard P3 (Scotland) and Building Regulation P5
(Northern Ireland. Compliance can be achieved via a Competent Person Self Certication
Scheme or noticaton of installation to the Local Authority Building Control Department.
It must be installed by a competent person as dened by the relevant regulations.
Manufacturers notes must NOT be taken as over-riding statutory obligations.
This appliance is not intended for use by persons (including children) with reduced
physical, sensory or mental capabilities, or lack of experience and knowledge unless
they have been given supervision or instruction concerning use of the appliance by
a person responsible for their safety. Children should be supervised at all times to
ensure they do not play with the appliance.
This information is provided to assist generally in the selection of equipment.
Responsibility for selection and specication of our equipment must however remain
that of our customer and any experts or consultants concerned with the installation(s).
Please note: that we do not therefore accept any responsibility for matters of design
selection or specication, for the eectiveness of an installation or system containing
one of our products unless specically requested to do so in writing.
All goods are sold subject to our conditions of sale which are set out at the rear of this
specication. In the interest of continuously improving the Viessmann Vitocell 200
Cylinder range, Viessmann Limited reserve the right to modify the product without
notice, and in these circumstances this booklet, which is accurate at the time of printing,
should be disregarded. An updated set of instructions will be produced and supplied
with new appliances and will be made available for other appliances on request.
This product is approved by Advantica where it is sold as a package with a
Viessmann boiler.
ViessmannVitocell 200 cylinders are produced under an ISO 9001:2008 Quality
Management System approved by BSI.
Benchmark places responsibilities on both manufacturers and installers.The purpose is to
ensure that customers are provided with the correct equipment for their needs, that it is
installed, commissioned and serviced in accordance with the manufacturers instructions
by competent persons and that it meets the requirements of the appropriate Building
Regulations. The Benchmark Checklist can be used to demonstrate compliance with
Building Regulations and should be provided to the customer for future reference.
Installers are required to carry out installation, commissioning and servicing work in
accordance with the Benchmark Code of Practice which is available from the Heating
and Hot Water Industry Council who manage and promote the Scheme. Visit www.
centralheating.co.uk for more information.
CONTENTS

Page 3
DESCRIPTION
DESIGN
Supplied By: Viessmann Ltd
Maximum inlet pressure to
Pressure reducing valve 12 bar
Operating pressure (PRV setting) 3 bar
Expansion vessel charge pressure 3 bar
Expansion relief valve setting 4.5 bar
Opening pressure of P & T Relief Valve 6 bar
Opening temperature of P & T Relief Valve 92-95°C
Energy cut-out thermostat setting 85°C
Max. working pressure - Primary heat exchanger (Indirect models) 6 bar
Max. working pressure - Solar heat exchanger (Solar models) 10 bar
Immersion heater rating 3kW, 240V AC
All cylinders are manufactured in accordance with the requirements of BS EN 12897
The tundish must be positioned so that it is visible to the occupant and is away from
electrical devices.
Components supplied with Viessmann Vitocell 200 cylinders
• Cold water inlet PRV combination valve/expansion relief
• Pressure and temperature relief valve
• Tundish
• 3kW Immersion heater including control and cut out thermostats
• Expansion vessel/mounting bracket/exible hose
• Cylinder temperature sensor and retaining clip (ZK00539)
• Technical/user product literature
Optional Extras
• Control thermostat
• Energy cut-out thermostat
• Energy cut-out motorised valve
(Note: Please refer to tables 1 and 2 on pages 6-9 to conrm the quantity of immersion
heaters supplied with the unit)
In any situation where the volume of heated pipework (eg. secondary circulation pipes
or manifold pipework for multiple units) exceeds 10 litres, then an additional expansion
vessel must be tted to accommodate the extra expansion volume.
Handling Before Installation
Viessmann Vitocell 200 Cylinder must be handled with care and stored the correct
way up in a dry place. Any manual handling/lifting operations will need to comply
with the requirements of the Manual Handling Operations Regulations issued by the
H.S.E. The appliance can be moved using a sack truck on the rear face although care
should be taken and the route should be even. In apartment buildings containing a
number of storeys we would recommend that the appliances are moved vertically
in a mechanical lift. If it is proposed to use a crane, expert advice should be obtained
regarding the need for slings, lifting beams etc.
A specic manual handling assessment is shown in Appendix B at the rear of this
manual.
Maintenance
Modifications should not be made to this
product. Replacement parts, including immersion
heaters, should be purchased from Viessmann
Limited, or agents approved by them. Unvented
hot water storage vessels need regular routine
checks, and these are detailed below. It is for
this reason that this manual must always be left
with the Viessmann Vitocell 200 Cylinder.
It is essential that these checks be carried out
at the time of boiler maintenance by a qualied
installer:
1. Manually open the relief valves in turn, and
check that water is discharged from the
valves and runs freely through the tundish
and out at the discharge point. Ensure that
the valves re-seat satisfactorily. (Note - the
water may be very hot).
2. It is important to check that the discharge
pipework is carrying the water away
adequately. Check for blockages etc. if it is
not.
3. Turn the mains water o and remove and
clean the strainer element in the Pressure
Reducing Valve.
4. Check the charge pressure in the expansion
vessel and repressurise if required
5. Re-ll the system and ensure that all relief
valves have re-seated.
6. The Benchmark Service Record should be
updated at each service.
7. Check the water pressure downstream of the
combination valve is 3 bar in static condition.
8. Check and if necessary, descale the heat
exchanger in hard water areas ie. above
200ppm (mg/l).
Note:
The cylinder is factory tted with a temperature
& pressure relief valve that must not be used for
any other purpose or removed.
The cylinder is factory tted with immersion
heaters with thermal cut outs. Immersions
without thermal cut outs must not be tted.

Page 4
DESIGN
DESCRIPTION
Introduction
Viessmann Vitocell 200 Cylinder is a range
of unvented hot water storage cylinders,
manufactured in the latest high quality duplex
stainless steel. They are designed to provide
mains pressure hot water and are supplied as a
package which complies with Section G3 of the
Building Regulations. The appliance is extremely
well insulated using high density HCFC free foam
insulation with an ozone depleting potential
(ODP) of zero and a global warming potential
(GWP) of 1. It is tted with all necessary safety
devices and supplied with all the necessary
control devices to make installation on site as
easy as possible.
ViessmannVitocell 200 Cylinder is available
in two basic variants:
1. Viessmann Vitocell 200-V Cylinder - For
use with gas or oil boilers (Figure 1). Vitocell
200 Cylinders must not be used with solid
fuel boilers or steam as the energy source.
2. ViessmannVitocell 200-B Solar Cylinder
- For providing hot water by solar gains
and gas or oil boilers (Figure 2). Unvented
cylinders must not be used with solid fuel
boilers or steam as the energy source.
Viessmann Vitocell 200-V Cylinder
Viessmann Vitocell 200-V Cylinder is an
unvented hot water storage cylinder and is
provided with a high eciency internal primary
coil which is designed for use with a gas or oil
boiler and is suitable for both open vented and
sealed pumped primary systems.
When used with a sealed heating system the
boiler must incorporate its own energy cut-out
overheat thermostat.
Viessmann Vitocell 200-V Cylinder models are
listed in Table 1 on Page 6 & 7.
Pipework is not supplied by manufacturer,
but to be supplied and tted by installer.
Viessmann Vitocell 200-V Cylinder
Figure 1

Page 5
DESIGN
DESCRIPTION
Pipework is not supplied by manufacturer,
but to be supplied and tted by installer.
Viessmann Vitocell 200-B Solar Cylinder
Viessmann Vitocell 200-B Solar Cylinder is an
unvented hot water storage cylinder and is
provided with a high eciency internal primary
coil which is designed for use with a gas or oil
boiler and is suitable for both open vented and
sealed pumped primary systems.
When used with a sealed heating system the
boiler must incorporate its own energy cut-out
overheat thermostat.
A high eciency second solar coil is positioned
below the primary coil to ensure maximum
benet of solar gain energy.
ViessmannVitocell 200-B Solar Cylinder models
are listed in Table 1 on Page 6 & 7.
Note:
The cold supply elbow c/w drain tapping
must be tted as shown in gs 1, 2, 3 and 4.
A exible hose can then be connected to the
drain tapping and, providing the hose runs
below the lowest level of the cylinder, then
all the water contents can be drained out by
syphonic action. (The cold feed pipe dips
internally to the base of the cylinder.)
Viessmann Vitocell 200-B Solar Cylinder
Figure 2

Page 6
DESIGN
TECHNICAL DATA
A
C
Vitocell 200-V
D
H
F
E
I
J
B
G
D
Vitocell 200-B Solar
N
G
P
I
E
K
J
A
B
M
L
C
Table 1
Model
Product Stock Code
Energy Eciency Class
Heat Loss
Capacity (Total Volume)
Weight - Empty
Weight - Full
Pressure Regulator 3 bar inlet
group c/w balance cold supply,
expansion vessel connection and
expansion valve set at 4.5 bar
Expansion Vessel size.
Pre-charged to 3 bar
Overall Height
Overall Diameter
Pressure & Temperature
Relief Valve 6bar 95°C
22mm Secondary
Return Tapping
On Peak Immersion
Heater - High Level
Cold Feed 22mm
Compression Connection
O Peak Immersion
Heater - Low Level
Volume of On Peak Water
Heated
Dual Control & Overheat Stat
Extra Stat Pocket
For Boiler Use If Required
22mm Primary Return
Compression Connection
22mm Primary Flow Compression
Connection
22mm Solar Return
Compression Connection
22mm Solar Flow
Compression Connection
Dual Control & Overheat Stat
Solar Pocket Solar Pocket
kW Rating of Primary Coil
Surface Area of
Primary Heater Coil
Pressure Loss Across
Primary Heater Coil
Surface Area of
Solar Heater Coil
Pressure Loss Across Solar Heater
Coil
Heat Up Time from 15°C to 60°C
(applies to Primary Heat Source only)
Dedicated Solar Volume
Watts Litres kg kg bar Litres A=mm mm B=mm C=mm D=mm E=mm F=mm Litres G=mm H=mm I=mm J=mm K=mm L=mm M=mm N=mm P=mm kW m2bar m2bar min Litres
Vitocell 200-V
90 7572707 B 35 90 19 109 3 12 745 550 490 n/a 352 367 n/a 40 367 367 223 312 n/a n/a n/a n/a n/a 16.5 0.59 0.165 n/a n/a 17 n/a
120 7572708 B 44 120 22 142 3 12 930 550 678 n/a 352 367 n/a 67 367 367 223 312 n/a n/a n/a n/a n/a 18 0.59 0.165 n/a n/a 21 n/a
150 7572709 B 51 150 26 176 3 18 1120 550 865 n/a 392 442 n/a 92 407 407 223 392 n/a n/a n/a n/a n/a 18.5 0.68 0.191 n/a n/a 25 n/a
180 7572710 B 54 180 28 208 3 18 1305 550 1053 n/a 432 442 n/a 116 447 447 223 392 n/a n/a n/a n/a n/a 19 0.78 0.216 n/a n/a 30 n/a
210 7572711 C 65 210 33 243 3 24 1495 550 1241 1127 432 442 n/a 145 482 482 223 392 n/a n/a n/a n/a n/a 25.6 1.37 0.297 n/a n/a 32 n/a
250 7572712 C 75 250 38 288 3 24 1745 550 1491 1377 927 522 512 109 577 577 223 472 n/a n/a n/a n/a n/a 27.1 1.37 0.297 n/a n/a 36 n/a
300 7572713 C 85 300 44 344 3 35 1992 550 1720 1577 1077 522 512 130 677 677 223 522 n/a n/a n/a n/a n/a 24.9 1.37 0.297 n/a n/a 38 n/a
Vitocell 200-B Solar
210 7572714 C 65 210 35 245 3 24 1495 550 1240 1127 723 437 n/a 95 888 n/a 758 1018 223 352 419 1000 233 18.5 0.68 0.191 0.680 0.191 35 101
250 7572715 C 75 250 40 290 3 24 1745 550 1491 1377 785 522 n/a 115 970 n/a 820 1120 223 472 539 1180 294 19 0.78 0.216 0.970 0.241 38 107
300 7572716 C 85 300 46 346 3 35 1992 550 1720 1577 910 522 n/a 140 1095 n/a 945 1245 223 472 539 1367 300 20.5 0.78 0.216 0.970 0.241 41 125

Page 7
DESIGN
TECHNICAL DATA
4
0
,0
0
º
4
5
,
00º
3
5
,00º
2
5,
0
0
º
1
5
,
0
0
º
NOTES
1. Not all models - see table 1.
2. Recovery times based on Primary
Coil/I.H. duty (ie. assumes the boiler
output is adequate).
3. All connections are supplied with
compression fittings for direct
connection to copper pipework.
4. The diagrams shown are generic.
For exact product specification
refer to the table eg. the number
of immersion heaters varies
depending on model.
5. Heat up and recovery times based
on 0.25 l/s primary ow rate and at
82°C ow temperature.
Table 1
Model
Product Stock Code
Energy Eciency Class
Heat Loss
Capacity (Total Volume)
Weight - Empty
Weight - Full
Pressure Regulator 3 bar inlet
group c/w balance cold supply,
expansion vessel connection and
expansion valve set at 4.5 bar
Expansion Vessel size.
Pre-charged to 3 bar
Overall Height
Overall Diameter
Pressure & Temperature
Relief Valve 6bar 95°C
22mm Secondary
Return Tapping
On Peak Immersion
Heater - High Level
Cold Feed 22mm
Compression Connection
O Peak Immersion
Heater - Low Level
Volume of On Peak Water
Heated
Dual Control & Overheat Stat
Extra Stat Pocket
For Boiler Use If Required
22mm Primary Return
Compression Connection
22mm Primary Flow Compression
Connection
22mm Solar Return
Compression Connection
22mm Solar Flow
Compression Connection
Dual Control & Overheat Stat
Solar Pocket Solar Pocket
kW Rating of Primary Coil
Surface Area of
Primary Heater Coil
Pressure Loss Across
Primary Heater Coil
Surface Area of
Solar Heater Coil
Pressure Loss Across Solar Heater
Coil
Heat Up Time from 15°C to 60°C
(applies to Primary Heat Source only)
Dedicated Solar Volume
Watts Litres kg kg bar Litres A=mm mm B=mm C=mm D=mm E=mm F=mm Litres G=mm H=mm I=mm J=mm K=mm L=mm M=mm N=mm P=mm kW m2bar m2bar min Litres
Vitocell 200-V
90 7572707 B 35 90 19 109 3 12 745 550 490 n/a 352 367 n/a 40 367 367 223 312 n/a n/a n/a n/a n/a 16.5 0.59 0.165 n/a n/a 17 n/a
120 7572708 B 44 120 22 142 3 12 930 550 678 n/a 352 367 n/a 67 367 367 223 312 n/a n/a n/a n/a n/a 18 0.59 0.165 n/a n/a 21 n/a
150 7572709 B 51 150 26 176 3 18 1120 550 865 n/a 392 442 n/a 92 407 407 223 392 n/a n/a n/a n/a n/a 18.5 0.68 0.191 n/a n/a 25 n/a
180 7572710 B 54 180 28 208 3 18 1305 550 1053 n/a 432 442 n/a 116 447 447 223 392 n/a n/a n/a n/a n/a 19 0.78 0.216 n/a n/a 30 n/a
210 7572711 C 65 210 33 243 3 24 1495 550 1241 1127 432 442 n/a 145 482 482 223 392 n/a n/a n/a n/a n/a 25.6 1.37 0.297 n/a n/a 32 n/a
250 7572712 C 75 250 38 288 3 24 1745 550 1491 1377 927 522 512 109 577 577 223 472 n/a n/a n/a n/a n/a 27.1 1.37 0.297 n/a n/a 36 n/a
300 7572713 C 85 300 44 344 3 35 1992 550 1720 1577 1077 522 512 130 677 677 223 522 n/a n/a n/a n/a n/a 24.9 1.37 0.297 n/a n/a 38 n/a
Vitocell 200-B Solar
210 7572714 C 65 210 35 245 3 24 1495 550 1240 1127 723 437 n/a 95 888 n/a 758 1018 223 352 419 1000 233 18.5 0.68 0.191 0.680 0.191 35 101
250 7572715 C 75 250 40 290 3 24 1745 550 1491 1377 785 522 n/a 115 970 n/a 820 1120 223 472 539 1180 294 19 0.78 0.216 0.970 0.241 38 107
300 7572716 C 85 300 46 346 3 35 1992 550 1720 1577 910 522 n/a 140 1095 n/a 945 1245 223 472 539 1367 300 20.5 0.78 0.216 0.970 0.241 41 125

Page 8
DESIGN
SYSTEM DETAILS
Viessmann Vitocell 200-V Cylinder
Basic Appliance
1. Hot water draw o (22mm) compression
2. Temperature& pressurerelief valve92-95°/6bar
3. Hot water secondary return 22mm
(not tted to smaller sizes, see table 1)
4. Immersion heater 1¾” BSP 3kW
5. 22mm cold supply compression
6. Immersion heater 1¾” BSP 3kW
7. Dual control/overheat stat pocket (22mm)
8. Boiler control sensor pocket (spare)
9. Primary return (22mm)
10. Primary ow (22mm))
Part G3 loose components supplied in a
separate box
A. Combination inlet group incorporating
pressure reducing valve, strainer, check
valve, balanced cold take off point,
expansion relief valve and expansion vessel
connection points.
B. Potable expansion vessels c/w exible hose
and wall bracket
C. Tundish
D. Wiring junction box for primary system
E. Cylinder temperature sensor and xing clip
(part number ZK00539)
Optional components available
A. Dual control thermostat and combined
overheat thermostat
B. Two port (22mm) zone valve for
primary circuit
1
2
3
4
7
5
6
9
8
10
Typical arrangement of component kit shown tted to the appliance for clarity
Pipework to be supplied and tted by installer.

Page 9
DESIGN
SYSTEM DETAILS
7
9
3
11
6
12
12
1
2
8
4
5
10
Viessmann Vitocell 200-B Solar Cylinder
Basic Appliance
1. Hot water draw o (22mm) compression
2. Temperature& pressurerelief valve92-95°/6bar
3. Hot water secondary return 22mm
(not tted to smaller sizes, see table 1)
4. Immersion heater 1¾” BSP 3kW
5. 22mm cold supply
6. Dual control/Overheat stat pocket (solar)
7. Primary return (22mm)
8. Primary ow (22mm)
9. Dual control/Overheat stat pocket (boiler)
10. Solar coil return to panel collector (22mm)
compression
11.
Solar coil ow from panel (22mm) compression
12. Solar thermostat pocket
Part G3 loose components supplied in a
separate box
A. Combination inlet group incorporating
pressure reducing valve, strainer, check valve,
balanced cold take o point, expansion relief
valve and expansion vessel connection points.
B. Potable expansion vessels c/w exible hose
and wall bracket
C. Tundish
D. Wiring junction box for primary system
E. Cylinder temperature sensor and xing clip
(part number ZK00539)
Optional components available
A. Dual control thermostat and combined
overheat thermostat (x2)
B. Two port (22mm) zone valve for
primary circuit
Typical arrangement of component kit shown tted to the appliance for clarity
Pipework to be supplied and tted by installer.

Page 10
INSTALLATION
INSTALLATION
General Design Considerations
The cupboard footprint needs to be at least 650mm square for units.
The base chosen for the cylinder should be level and capable of supporting the weight
of the unit when full of water as shown in General Data. The discharge pipework for
the safety valves must have a minimum fall of 1 : 40 from the unit to a safe discharge
point. All exposed pipework and ttings on the cylinder should be insulated, and the
unit should NOT be xed in a location where the contents could freeze.
In new systems, pipes should be insulated to comply with building regs, the maximum
permissible heat loss is indicated in the table opposite, and labelled accordingly as follows:
i. Primary circulation pipes for domestic hot water circuits should be insulated
throughout their length, subject only to practical constraints imposed by the need
to penetrate joists and other structural elements.
ii. All pipes connected to hot water storage vessels, including the vent pipe, should
be insulated for at least 1 metre from their points of connection to the cylinder (or
they should be insulated up to the point where they become concealed).
In replacement systems, whenever a boiler or hot water storage vessel is replaced in
an existing system, any pipes that are exposed as part of the work or are otherwise
accessible should be insulated as recommended for new systems, or to some lesser
standard where practical constraints dictate.
The pipe connecting the boiler ow to the appliance must not be less than 22mm
copper or equivalent.
Further guidance on converting heat loss limits to insulation thickness for specic
thermal conductivities is available inTIMSA“HVAC guidance for achieving compliance
with Part L of the Building Regulations”.
Model Selection Guide
Max hot water demand
Max number
of bed spaces
(Bedrooms)
Litres
1 shower room Bedsit (0) 90
1 bathroom 2 (2) 120
1 bathroom 4 (3) 120
1 bathroom + separate shower room 6 (4) 150
1 bathroom + 2 separate shower rooms or 2
bathrooms 7 (5) 180
2 bathrooms + separate shower room 7 (5) 210
2 bathrooms + 2 separate shower rooms 7 (5) 250
3 bathrooms + 2 separate showers rooms 9 (6) 300
Solar Model Selection Guide
Max hot water demand Bedrooms Litres
1 bathroom + 1 shower room 1-3 210
1 bathroom + 2 shower rooms 2-4 250
2 bathrooms + 1 shower room 3-4 300
Insulation of pipework
Pipe outside
diameter
Maximum
heat loss
15mm 7.89W/m
22mm 9.12W/m
28mm 10.07W/m
35mm 11.08W/m
Mains Water Supply
Existing properties with a 15mm supply will be
satisfactory provided the local mains pressure
is good, but should be confined to single
bathroom properties. For new properties where
simultaneous demand is required to more than
one bathroom or a bathroom and one or more
en-suites, the communication and service
pipe into the dwelling should be a minimum
of 22mm (usually in the form of a 25mm MDPE
supply). The optimum performance is achieved
if the inet pressure is 3 bar dynamic. However,
the ViessmannVitocell 200 cylinder will function
with lower inlet pressures, but this will reduce the
performance. For optimum performance, 30L per
minute incoming mains ow should be present,
however the Viessmann Vitocell will work at lower
ow rates, although performance will be aected.
Normally Viessmann Vitocell 200 Cylinder
provides well in excess of 40 litres/min in most
conditions. Flow rates for ALL mains pressure
systems are subject to district pressures and
system dynamic loss. Particularly on larger
properties with more than one bathroom, the
pipe sizes should be calculated in accordance
with BS EN 806-3:2006 and BS 8558:2011.
Model Selection
The suggested model sizes are based on
typical hot water usage. For high specication
dwellings an increase of one model size should
be considered.

Page 11
INSTALLATION
INSTALLATION
General Restrictions
a. The highest hot or cold water draw o point should not exceed 10 metres above the
Pressure Reducing Valve.
b. An ascending spray type bidet or any other appliance with a Class 1 back-syphonage
risk requiring a type A air gap should not be used.
c. Viessmann Vitocell 200 Cylinder should not be used where steam is the primary
heating medium, or in a situation where maintenance is likely to be neglected.
d. Unvented cylinders are not suitable for use with solid fuel boilers.
e. If the supply to the mixer ttings (other than a dual outlet type) is not taken
from the balanced supply the system will become over pressurized and cause the
pressure relief valve to discharge. Over time this could also cause the premature
failure of the appliance itself which will not be covered by the warranty,
f. In larger properties with a number of bathrooms/en-suites and long pipe runs
we would recommend that the balanced cold supply is provided with its own
pressure reducing valve and is not taken from the balanced cold connection on the
combination valve. In this case it will also be necessary to t a small expansion vessel
on the balanced cold water system to accommodate the pressure rise caused by the
increase in temperature of the balanced cold water.
g. Check the performance requirements of the terminal ttings with regard to ow/
pressure are suitable.
h. In relation to potable water systems, expansion vessels shall be installed in a
vertical orientation and located so that the length of the connecting pipe work is
kept to a minimum.
Shower Fittings
Aerated taps are recommended to prevent splashing. Any type of shower mixing valve
can be used as long as both the hot and cold supplies are mains fed. However, all mains
pressure systems are subject to dynamic changes particularly when other hot and cold
taps/showers are opened and closed, which will cause changes in the water temperature
at mixed water outlets such as showers. For this reason and because these are now no
more expensive than a manual shower we strongly recommend the use of thermostatic
showers with this appliance. These must be used in 3 storey properties where the impact
on pressure/temperature of opening another tap in the system is greater than normal.
The shower head provided must also be suitable
for mains pressure supplies.
Pipe Layout
In all mains pressure installations it is important to
remember that the incoming cold supply must be
shared between all terminal fittings. It is important
that a 22mm supply is brought to the appliance and
a 22mm take-off is continued at least to the bath.
If there are two baths, 28mm pipework should be
considered. One metreof smaller diameterpipework,
or flow restrictors, should be provided on the final
connection to all outlets so as to balance the water
available. In any event the distribution pipework
should generally be in accordance with BS EN806-1
to 5.
Plastic Pipework
This appliance is suitable for use with plastic
pipework as long as the material is recommended
for the purpose by the manufacturer and is installed
fully in accordance with their recommendations.
Secondary Hot Water Circulation
Some models are tted with a secondary return
tapping as standard (see table 1 for details).
If fitted, an extra expansion vessel may be
necessary. A non-return valve MUST be FITTED
near the return connection. No valve or terminal
fitting should be installed between the non
return valve and the cylinder. (See schematic
arrangement on page 13.) All pipes kept hot by
the secondary circulation should be insulated.
INCOMING COLD SUPPLY
M
DC
DC
DC
TO
EXTERNAL
TAP
SINK
WATER SOFTENER (IF NECESSARY)
WM or DWM
WHB W.C.
DC
DC
SH
DHW
WHB
WC BATH
SCV SCV
P&T
ERV/NRV
PRV
DCV
Note:
Cold supplies to single taps must be
taken from the mains cold water
system.
Cold supplies to mixer taps must be
taken from the balanced cold water
connection on the combination
valve.

Page 12
INSTALLATION
INSTALLATION
Typical Discharge Pipe Arrangement
15 mm
discharge
pipe
Expansion
relief valve
Typical Discharge Pipe Arrangement
Dotted line showing
alternative route with
single tundish being used
600 mm max.
P & T
Relief
Valve
300 mm
min.
22 mm metal pipe with continuous
fall up to 9m equivalent length (D2).
NOTES:
The discharge will consist of scalding
waterand steam. Asphalt, roong felt
and non-metallic rainwater goods may
be damaged by such discharges.
It is not acceptable to discharge straight
into a soil pipe.
Discharge below
xed grating
Fixed Grating
Trapped gully
Pressure & Temperature/expansion Relief
Valve Pipework
The relief valve should be installed to discharge
in accordance with G3 of the Approved
Document of the Building Regulations and
should be piped to where it is visible, but will
not cause danger to persons or damage to
materials.
The following information is taken from
Approved Document G3 of the Building
Regulations and is provided to assist with
the design and installation of the discharge
pipework. However, the information is not
exhaustive and reference should always be
made to Approved Document G3 of the Building
Regulations. The nal decision regarding any
arrangements rests with Building Control and
it is recommended that their advice is sought
if you have any concerns regarding this aspect
of the installation.
The two safety valves will only discharge
water under fault conditions. When operating
normally water will not be discharged.
The tundish should be vertical, located in the
same space as the unvented hot water storage
system and be tted as close as possible and
within 600mm of the safety device e.g. the
temperature relief valve.
The discharge pipe (D2) from the tundish should
terminate in a safe place where there is no risk
to persons in the vicinity of the discharge, be
of metal and:
a) Be at least one pipe size larger than the
nominal outlet size of the safety device unless
its total equivalent hydraulic resistance
exceeds that of a straight pipe 9m long
i.e. discharge pipes between 9m and 18m
equivalent resistance length should be at
least two sizes larger than the nominal outlet
size of the safety device, between 18 and
27m at least 3 sizes larger, and so on. Bends
must be taken into account in calculating
the ow resistance. Refer to the table and
the worked example.
An alternative approach for sizing discharge
pipes would be to follow BS EN 806-2:2005
Specication for design installation, testing
and maintenance of services supplying water
for domestic use within buildings and their
curtilages.
b) Have a vertical section of pipe at least
300mm long, below the tundish before any
elbows or bends in the pipe work.
c) Be installed with a continuous fall.
WORKED EXAMPLE
The example below is for G1/2 temperature relief valve with a discharge pipe (D2)
having 4 elbows and length of 7m from the tundish to the point of discharge.
From the table below:
Maximum resistance allowed for a straight length of 22mm copper discharge pipe
(D2) from a G1/2 temperature relief valve is: 9m subtract the resistance for 4 x 22mm
elbows at 0.8m each = 3.2m.
Therefore the maximum permitted length equates to: 5.8m.
5.8m is less than the actual length of 7m therefore calculate the next largest size.
Maximum resistance allowed for a straight length of 28mm pipe (D2) from a G1/2
temperature relief valve equates to: 14m.
As the actual length is 7m, a 28mm (D2) copper pipe will be satisfactory.
Sizing of copper discharge pipe‘D2’ for a temperature relief valve
with a G1/2 outlet size (as supplied)
Size of discharge
pipework
Maximum length of
straight pipe
(no bends or elbows)
Deduct the gure below
from the maximum
length for each bend or
elbow in the discharge
pipe
22mm Up to 9m 0.8m
28mm Up to 18m 1m
35mm Up to 27m 1.4m

Page 13
INSTALLATION
INSTALLATION
d) It is preferable for the discharge to be visible at both the tundish and the nal point
of discharge but where this is not possible or practically dicult there should be
clear visibility at one or other of these locations. Examples of acceptable discharge
arrangements are:
1. Ideally below the xed grating and above the water seal in a trapped gulley.
2. Downward discharges at a low level; i.e. up to 100mm above external surfaces
such as car parks, hard standings, grassed areas etc are acceptable providing that
where children play or otherwise come into contact with discharges, a wire cage
or similar guard is positioned to prevent contact whilst maintaining visibility.
3. Discharges at a high level; e.g. into metal hopper and metal down pipe with the
end of the discharge pipe clearly visible (tundish visible or not) or onto a roof
capable of withstanding high temperature discharges of water and 3m from
any plastic guttering systems that would collect such discharges.
4. Where a single pipe serves a number of discharges, such as in blocks of ats,
the number served should be limited to not more than 6 systems so that any
installation can be traced reasonably easily. The single common discharge pipe
should be at least one pipe size larger than the largest individual discharge
pipe to be connected. If unvented hot water storage systems are installed
where discharges form safety devices may not be apparent i.e. in dwellings
occupied by blind, inrm or disabled people, consideration should be given to
the installation of an electronically operated device to warn when discharge
takes place.
Safety
The safety devices supplied or tted on aViessmann Vitocell 200 Cylinder are selected
for their suitability for the temperatures and pressures involved. They must not be
changed, removed or by-passed and it is essential that only genuine replacement parts
supplied or approved by Viessmann Limited are used. This includes the immersion
heaters, which must incorporate an energy cut-out. All parts are available to approved
installers from Viessmann Limited. Where the boiler and cylinder are supplied as a
package we have Advantica approval.
Combination Inlet Group
Combines elements 1, 2 and 3 below.
1. Pressure Reducing Valve - This must be xed
near the cylinder. The cold water supply
to any mixer taps/showers must be taken
from the cold water tapping of this valve
to ensure balanced hot and cold pressures.
This valve is factory set to ensure the correct
operating pressure for the Viessmann
Vitocell 200 Cylinder.
2. Non Return Valve - This is integral with the
pressure reducing valve to prevent backow
of hot water towards cold water draw o
points.
3. Cold Water Expansion Relief Valve - This safety
device is preset at the factory and will relieve
excess cold water pressure resulting from a
fault condition.
P&T Relief Valve
Tundish
Hot Outlet
To Drain
PRV
ERV NRV
Stop
Tap
Kitchen
Cold
Tap Combination
Valve
Balanced
Cold
Outlets
Immersion Heater
Expansion
Vessel
Boiler
Return
Boiler
Flow
2 Port Valve
Secondary
Return Circuit
Schematic Diagram
Non Return
Valve
Pump

Page 14
Temperature/Pressure Relief Valve
This safety device is also pre-set at the factory and relieves before the temperature
reaches 100°C. It is also a Pressure Relief Valve, and is pre-set to 6 bar.
Immersion Heaters
These are 3kW 240V AC heaters
and incorporate a thermostat and
a manually reset energy cut-out
which operates at 85°C. They have
incalloy elements to prolong their
life expectancy in aggressive water
conditions. Please refer to table 1 to
clarify how many o peak and on peak
immersions are included with the unit
you require.
Where it is intended that units are
tted to opeak circuits, then suitable
controllers such as the Horstmann o
peak electric time controller will be
required. External wiring to the immersion heaters must be in accordance with the
relevant IEE Wiring Regulations and the circuit must be protected by a suitable fuse
and a double pole isolating switch.
The correct method of terminating the wiring to the immersion heater is shown above.
Usage of the product in non-domestic commercial applications can be extremely
intensive and stressful to various components. We recommend that titanium
immersion heaters are tted in such situations, rather than the incoloy heater
supplied as standard. Titanium immersion heaters oer superior strength, weight
and a smoother nish which enable them to better withstand the extreme stress
and temperature uctuation often encountered within non-domestic environments
and situations where water quality is poor – ensuring improved performance and
extended operational life.
INSTALLATION
INSTALLATION
Safety
Cut-out
Thermostat
Immersion Heater Wiring
E
L
N
Line Strainer
This is integral within the combination inlet
group to reduce the likelihood of contaminants
fouling the valve seat. Following installation
this line strainer must be cleaned and replaced.
This needs to be carried out on a regular basis. as
part of the annual maintenance/service check.
Tundish
This is to allow the discharge from any Relief
Valve to be seen. It must be tted away from
any electrical devices. See page 12 for discharge
pipework details.
Safety
The immersion heaters must be earthed and
they must be isolated from the mains before
the cover is removed on every occasion.
Replacement immersion heaters should be
obtained from Viessmann Limited.
Solar Thermistors / sensors
Care must be taken to ensure that the solar probes
are fully inserted into the pockets provided. A
xing clip is supplied.
Important
Failure to follow the drain down procedure will
invalidate the warranty. (see page 20)
NEVER drainthecylinder ofhot waterandthen
close all cylinder inlets and outlets.
REASON as the air remaining in the cylinder
cools the pressure inside the
cylinder will fall below atmospheric
and cause damage to the cylinder.
NEVER close the cold main and drain the
cylinder via any tap connected to it.
REASON as the water drains, the pressure
inside the cylinder may decrease
below atmospheric and this may
cause damage to the cylinder.
In line with good plumbing practice, use of
excessive ux should be avoided.
Gate Valve
All our cylinders are tested to BS EN 12897 at
15 l/min at which they exceed the minimum
requirements for heat up performance and reheat
in less time than the maximum reheat times.
If a ow rate above 25 l/min is present in the
primary cylinder heating circuit, a gate valve can
be tted in this circuit to reduce the owrate. This
may be required if ow noises become apparent.
If two Viessmann Vitocell 200 Cylinders are coupled together the secondary inlet and
outlet pipes must be balanced. The units must be tted on the same level.
Note:No valvesmust be ttedbetweentheexpansion vesseland the storagecylinder(s).
I.V.
Combination Valve
I.V.

Page 15
INSTALLATION
INSTALLATION
Heating/primary Systems
The boiler and primary/heating systems should
be sized and installed in accordance with BS
EN 12828:2003, BS EN 12831:2003 & BS EN
14336:2004.
Safety
Viessmann Vitocell 200 Cylinder is tted with a
CombinedTemperature/Pressure ReliefValve to
cope with any increase in system temperature
and pressure above the design limitations,
when used with boilers up to 45kW output,
which is the maximum allowed by section G3
of the Building Regulations. The primary water
temperatures should be controlled as outlined
below.
Primary Circuit
The cylinder primary circuit must be pumped. No
further controls or safety devices are required for
an all-Viessmann installation. Any other make of
boiler may require a limit thermostat and 2 port
valve to be tted.
Sealed Primary Circuit
Any boiler used must be tted with an over
temperature cut-out. Unvented primary circuits
may be filled or replenished by means of a
temporary connection between the circuit and
a supply pipe provided a ‘Listed’ double check
valve or some other no less eective backow
prevention device is permanently connected
at the inlet to the circuit and the temporary
connection is removed after use. Alternatively,
a CA device can be used, which will allow the
system to be permanently connected to the
cold mains supply. The primary system can
then be topped up, when required, in the same
way as an open vented system tted with an
F&E Cistern.
Schematic Open Vented Primary System
Boiler
Pump
150mm max.
Warming/Overow
Pipe
F & E Cistern
Minimum
distance as
required by
boiler
manufacturers
instructions
Motorised Valve
Motorised Valve
Schematic Sealed Primary System
Boiler
Motorised Valve
Motorised Valve
Expansion
Vessel
Gauge
Safety Valve
Pump

Page 16
INSTALLATION
INSTALLATION
A Optional outside temperature sensor for weather compensated operation
B Optional Open Therm device
C Connecting plug and terminal block
D Remove the link 1 - L if external mains voltage switching is required for central
heating control
E Mains power connecting lead into the boiler
F Connection for external mains voltage switching for central heating control
5 Connection for cylinder temperature sensor
4-Pipe System
If the Vitocell 200 is installed with a Viessmann
Vitodens condensing system boiler then it is
recommended to install the system to a 4-pipe
system as shown in the diagram opposite.
ViessmannVitodens system boilers operate on a
sealed primary circuit and are factory tted with
an integral diverter valve, PRV and expansion
vessel, and a suitable energy cut-out device to
comply with G3 requirements. If any Vitodens
system boiler is installed with a Vitocell 200,
please use the DHW cylinder sensor (ZK00539).
All Viessmann Vitodens System boilers have an
on-board diverter valve and 4-pipe connections.
The outer pipes are for the central heating
circuit, and the inner pipes are for the cylinder
heat exchanger coil circuit. The built-in diverter
valve gives domestic hot water priority and may
be under the control of a Viessmann cylinder
temperature sensor.
If this Viessmann Vitodens System boiler is
connected correctly to a Vitocell 200 or 300
unvented water cylinder as a 4 pipe boiler and
controlled by aViessmann cylinder temperature
sensor, it does not require additional safety
devices such as a cylinder limit thermostat or
2 port valve.
Note: This does not apply if either the boiler
or the cylinder or the controls are exchanged
for other makes or models.
The cylinder temperature sensor connects to
red minature spade terminals numbered 5 on
the boiler wiring loom - not the pcb. Look for
a coil of wire at the lower rear of a Vitodens
100-W or to the left of the pcb on a Vitodens
200-W. Fixing clips for this and the solar sensor
are included.
Gas condensing boiler:
• For Viessmann DHW cylinders:
Cylinder temperature sensor (plug on the
cable harness outside the control unit)
Hydraulic schematics of a Viessmann 4-pipe installation
Note
It is recommended that the
cylinder coil output is >10 kW to
prevent long hot water re-heat periods.
Domestic hot water has priority.
Energy cutout devices tted in the
Viessmann boiler
Boiler
Wiring plan for connecting the cylinder temperature
sensor to aViessmann system boiler

Page 17
Schematic Solar System With Viessmann Boiler As Solar Controller
Solar Pumping Station
Solar Panel
Expansion
Vessel
Solar
Controller
INSTALLATION
INSTALLATION
A typical arrangement of a solar system incorporating aViessmann Vitocell 200-B Solar
Cylinder appliance is shown above. All components in a solar primary system must
be marked or identiable in such a way that their design pressure and temperature
can be readily determined.
A pressure relief valve to control the risk of over-pressure in system components
should be tted. A termination from a pressure relief valve should minimise the risk
of damage to persons or materials. Suitable locations are into a high temperature
receptacle, an internal gully or externally at ground level. High level termination from
walls or on roofs could cause injury to people or animals below if the valve were to
release scalding water and steam.
The pipe leading to the safety device and the collector should be of rigid and non-
deformable construction, without any possibility of restriction or blockage by any other
tted component. A more detailed diagram of our recommended arrangement for a
typical solar system is shown on page 18.
The solar pocket provided accommodates a 6mm diameter sensor which, with the
sensor located in the solar collector (or in the ow pipe immediately adjacent to the
collector), will provide the information required by the Vitosolic 100 controller.
All our cylinders are tested to BS EN 12897 at 15 l/min primary ow at which they
exceed the minimum requirements for heat up performance and reheat in less time
than the maximum reheat times.
In situations where excessive ow primary rates above 25 l/min are present, t a
regulating valve in the cylinder primary circuit.
If the solar controller can cause the cylinder temperature to exceed 80°C, then a Solar
tempering valve must be tted to the domestic hot water outlet of the cylinder. This
must limit the hot water temperature to a maximum of 60°C. (ref building regulations
part G3 3.63). Suitable plumbing congurations for installing this valve are shown
on page 18.

Page 18
INSTALLATION
INSTALLATION
Mixed HW out
Mains CW in
Figure 1: Cold port of the blending valve connected to mains supply
NOT ALLOWED
Mixed HW out
Mains CW in
Figure 3: Cold port of the blending valve connected to mains supply
to the vessel after the inlet control group
Mixed HW out
Mains CW in
Non-Return Valve (must be tted)
Figure 2: Cold port of the blending valve connected to balanced cold
supply - NON-RETURN VALVE MUST BE FITTED
Fitting Blending Valves To The Unvented
Viessmann Vitocell Appliances
When tting a blending valve to the unvented
appliances, it is important that the installation
does not contravene the G3, WRC and Health
and Safety directives or the manufacturers
recommendations. If this is the case, then
the warranty should be null & void. The key
requirements to comply with these regulations
are: -
1. Any fitting or material in contact with
potable water (e.g. a blending valve) must
be approved by WRC or an equivalent body.
2. Connections or wiring arrangements must
not bypass any safety devices.
3. Any expansion due to heating must not be
allowed to expand back into the cold mains.
4. The settings of any safety devices must not
be tampered with or adjusted.
The diagrams opposite shows how the
blending valve can be piped onsite.
Figure 1 shows the cold water port of the
blending valve connected to the mains cold
water supply before the inlet control group.
This arrangement is completely unacceptable
and illegal because: -
• the water is allowed to expand in to mains
cold water supply.
• the vessel will be charged to the incoming
mains supply which may be considerably
higher than the working pressure of the
vessel.
If this arrangement is used then the warranty
will not be valid.
Figure 2 shows the cold water port of the
blending valve connected to the balanced
cold water outlet. This arrangement will only
be acceptable if a WRAS approved non-return
valve is tted, otherwise: -
• during the heating cycle, the water will
expand back into the mains supply, as the
regulating valve must not be relied upon
to act as a check valve under all operating
conditions.
• depending upon the characteristics of the
blending valve, hot water may also ow from
the balanced cold water taps.
Figure 3 shows the cold port of the blending
valve connected to the cold water supply to the
vessel after the inlet control group. This should
be the preferred method. It is recommended
that the installer should ensure that there is no
gravity circulation in the pipework connected to
the cold port. If necessary, this can be achieved
by tting a non-return valve or using a thermal
trap.
✗

Page 19
INSTALLATION
INSTALLATION
1 98765432 10
T
1 bar
Solar
Pumping
Station
C1 2 C1
+ C
o
+ C
o
L N
230 VAC 5 amp
Mains Supply
Viessmann
Vitocell 200-B
Solar Cylinder
TAnti Gravity
Check Valve
Pressure
Relief Valve
Anti Gravity
Check Valve
Standard 10 way
wiring junction box
(Not supplied)
No isolation valve
should be installed
between the solar
circuit and the safety
valve (pressure relief
valve)
Vitosolic 100 Type SD1
212019181716
LNR1NR2N
1514131211109654321
S1 S2 S3 PWM 145
Red/White Brown/Blue
Pocket 6
Dual Thermostat
Set the control
thermostat to maximum
Pocket 12
Solar Cylinder Temperature Sensor
Pocket 9 Sensor
ZK00539 for boiler
Solar
Coil
Boiler
Coil
Collector temperature sensor S1
Pocket numbers as on Page 9
Schematic Showing Solar Wiring Requirements

Page 20
INSTALLATION
COMMISSIONING
Commissioning
Connections can come loose in transit, and all should be checked before installation.
The 90 degree elbow tted on the hot draw o needs to be positioned and tightened
by installer.
The control thermostat of the immersion heaters for direct heating of our cylinders
are set at 60°C. The control thermostat for indirect heat exchanger heat up of our
cylinders are usually set at between 60°C - 65°C. During commissioning the actual
temperature that the cylinder reaches when the thermostat(s) operate should be
tested and adjusted so that it achieves a minimum of 60°C. This temperature needs
to be achieved on a regular basis.
Check the pressure on the air side of the expansion vessel = 3 bar. This must be done
when the water in the cylinder is free to expand in atmospheric pressure or the cylinder
and relevant pipe work is empty.
Check that the drain cock is closed, and open all the cold and hot water taps and other
terminal ttings. Allow the system to ll with water, and to run until there is no air left
in the system. Close the taps and inspect the system closely for leaks.
Manually open the Relief Valves one by one and check that water is discharged and
run freely through the tundish and out at the discharge point. The pipework should
accept full bore discharge without overowing at the tundish, and the valve should
seat satisfactorily.
In line with good plumbing practice, use with excessive ux should be avoided. When
soldering above the cylinder, ensure ux/solder does not contaminate the cylinder
below, since this can cause corrosion. Flushing should be done performed as per BS
EN 806:4 2010 section 6.2.
Allow the cylinder to heat to normal working temperature, then thoroughly ush the
domestic hot and cold water pipework through each tap.
NOTE: If this appliance is to be installed in other than a single domestic dwelling ie. in
an apartment block or student ats etc., the hot and cold water system will need to be
disinfected in accordance with BS EB 806:4 2010 section 6.3 and the Water Regulations.
Because the Viessmann appliance is stainless steel, the use of chlorine as the
disinfection agent can cause damage unless the appliance is adequately ushed and
relled with the mains water immediately on completion of the disinfection procedure.
Damage caused through a failure to do this
adequately will not be covered by the warranty.
For the above reasons we recommend the use
of a non chlorine dased disinfectant such as
Fernox LP Sterox as manufactured by Cookson
Electronics when carrying out disinfection of
systems incorporating these appliances.
Remove the lter from the combination inlet
group clean and replace. Rell the system and
open all hot taps until there is no air in the pipe
work. ENSURE CYLINDER IS DRAINED PRIOR
TO CHECKING OR REMOVING FILTER FROM
THE COMBINATION INLET GROUP.
Allow the cylinder to heat to normal working
temperature with whatever heat source is to be
used, and check again for leaks. The pressure
relief valve or the P&T valve should not operate
during the heating cycle. If the P&T valve
operates before the pressure relief valve due
to high pressure, check that the inlet control
group is tted correctly.
The boiler/heating systems should be lled and
commissioned in accordance with good practice
following the guidance in BS 7593:2006/the
boiler manufacturers instructions.
NOTE
At the time of commissioning, complete all
relevant sections of the Benchmark Checklist
located on the inside back pages of this
document.
This must be completed during commissioning
and left with the product to meet the warranty
conditions.
IMPORTANT - DRAIN DOWN PROCEDURE
1 Switch o both the boiler and the immersion heater
2 Open the nearest hot tap and run all hot water until cold, then close it
3 Close the incoming cold main at the stop tap
4 Hold open the pressure and temperature relief valve until water stops
discharging into the tundish and leave it open
5 Open the cold taps starting from the highest point and working down to
the lowest tap, leaving them open
6 When the cold taps have stopped draining, open the hot taps starting from
the highest and working down to the lowest tap
7 Open the drain cock and ensure the pressure and temperature relief valve
is held open until the cylinder is empty