Viessmann VITOCELL 300W Service manual

Installation, Operating
and Service Instructions
5813 312 - 01 02/2018
for use by heating contractor
Vitocell 300-V, EVIB
Single coil, indirect-fired domestic hot water storage tank
119 USG (450 L) capacity
Read and save these instructions
for future reference.
IMPORTANT
Please file in Service Binder
Product may not be exactly as shown
VITOCELL r 300 -W, 300-V
Vitocell 300-W, EVIA
Single coil, indirect-fired domestic hot water storage tank
42 USG (160 L) capacity
Vitocell 300-V, EVIA
Single coil, indirect-fired domestic hot water storage tank
53 USG (200 L) capacity
Vitocell 300-V, EVIA
Single coil, indirect-fired domestic hot water storage tank
79 USG (300 L) capacity

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5813 312 - 01
Vitocell 300-W/V, EVIA/EVIB Installation, Operating and Service
Safety, Installation and Warranty Requirements
Introduction
Please ensure that these instructions are read and understood before commencing installation. Failure to comply with
the instructions listed below and details printed in this manual can cause product/property damage, severe personal
injury, and/or loss of life. Ensure all requirements below are understood and fulfilled (including detailed information
found in manual subsections).
CAUTION
The heat transfer medium must be either potable water
or contain only substances which are recognized as safe
by the U.S. Food and Drug Administration.
The Pressure of the heat transfer medium must be
maintained less than the normal minimum operating
pressure of the potable water system
Licensed professional heating contractor
The installation, adjustment, service and maintenance
of this equipment must be performed by a licensed
professional heating contractor.
Please see section entitled
“Important Regulatory and Installation
Requirements”.
Product documentation
Read all applicable documentation before commencing
installation. Store documentation near product in a
readily accessible location for reference in the future
by service personnel.
For a listing of applicable literature,
please see section entitled “Important
Regulatory and Installation Requirements”.
Advice to owner
Once the installation work is complete, the heating
contractor must familiarize the system operator/
ultimate owner with all equipment, as well as safety
precautions/requirements, shutdown procedure, and
the need for professional service annually before the
heating season begins.
Warranty
Information contained in this and
related product documentation must
be read and followed. Failure to do
so renders the warranty null and void.
In solar applications
Heat transfer medium
CAUTION
The heat transfer medium must
be water or other non-toxic fluid having a toxicity rating
or class of 1, as listed in clinical toxicology of commercial
products, 5th edition.
This tank version is not suitable for steam heating
applications.
The pressure of the heat transfer medium must be
limited to a max. of 30 psig by an approved safety
or relief valve.

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5813 312 - 01
Vitocell 300-W/V, EVIA/EVIB Installation, Operating and Service Contents
Safety, Installation and Warranty Requirements..............2
Licensed professional heating contractor ....................2
Product documentation ............................................2
Advice to owner .....................................................2
Warranty ...............................................................2
Important Regulatory and Installation Requirements....... 4
Codes....................................................................4
Mechanical room ....................................................4
Working on the equipment .......................................4
Instructing the system user ......................................5
Initial startup..........................................................5
Operation ...............................................................5
Technical literature .................................................5
About These Instructions ............................................6
Product Information....................................................6
Tank Setup ...............................................................6
42 and 53 USG (160 and 200 L) Tank Connections ...... 7
79 USG (300 L) Tank Connections ............................. 7
119 USG (450 L) Tank Connections ........................... 8
42 and 79 USG (160 and 300 L) Tank Installation........ 8
42 and 53 USG (160 and 200 L) Tank Installation........ 9
79 USG (300 L) Tank Installation............................. 10
119 USG (450 L) Tank Installation .......................... 11
Boiler Water Connections (heat exchanger connection).......14
Domestic Water Connections.....................................15
42 and 79 USG (160 and 300 L) Pressure Drop Information ..17
119 USG (450 L) Pressure Drop Information................18
Initial Startup...........................................................19
Domestic Hot Water Production .................................19
Temperature and Pressure Relief Valve........................20
Shutdown ...............................................................20
Service and Cleaning ................................................21
Necessary Tools.......................................................21
Service Procedures ..................................................21
Shut Down Heating Systems .....................................22
Check all Connections .............................................22
Ensure Proper Operation of all Safety Devices ............ 22
Clean Outside of Tank ..............................................22
Place System in Operation Again...............................22
Cleaning the Inside of the 42 and 79 USG
(160 and 300 L) Tanks ................................................23
Cleaning the Inside of the 119 USG (450 L) Tanks.......24
Vitocell 300-W/V, EVIA 42 and 53 USG (160 and 200 L)...25
Vitocell 300-V, EVIA 79 USG (300 L) ..............................26
Vitocell 300-V, EVIB 119 USG (450 L)..............................27
Installation Set 42 and 53 USG (160 and 200 L)................30
Installation Set EVIA 79 USG (300 L)...............................30
Installation Set EVIB 119 USG (450 L) ..............................30
Maintenance Record.................................................31
Introduction
Safety
General Information
Installation
Additional Information
Operation
Service
Parts
Maintenance
Page

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5813 312 - 01
Vitocell 300-W/V, EVIA/EVIB Installation, Operating and Service
WARNING
If the heating system itself is to be filled with Glycol or
any other antifreeze, the system fill must be of non-toxic
or food grade antifreeze. In any circumstance, a non-toxic
fluid must be used. Ensure a copy of the Safety Data
Sheet (SDS) is supplied to the operator/ultimate owner
of the system. The use of Viessmann supplied “Tyfocor-
HTL” solar fill is recommended for the solar heating
circuit.
Codes
The installation of indirect-fired hot water storage tanks
in boilers and solar system application might be governed
by individual local rules and regulations for this type of
product, which must be observed. Always use latest
editions of codes.
THIS TANK MEETS NSF/ANSI 372 FOR LOW LEAD CONTENT.
In the Commonwealth of Massachusetts, all plumbing
work must be done by a licensed plumber or gas-fitter
and for gas installations, all gas piping must be done by
a licensed gas-fitter.
Mechanical room
Ensure the mechanical room complies with the
requirements of the system design guideline and/or
Technical Data Manual (available from your Viessmann
sales representative).
The tank must be installed in a mechanical room which
is never subject to freezing temperatures.
Ensure water in tank is drained if not in use and danger
of freezing exists in the mechanical room.
Working on the equipment
The installation, adjustment, service, and maintenance
of this equipment must be done by a licensed professional
heating contractor who is qualified and experienced in
the installation, service, and maintenance of hot water
heating systems. There are no user serviceable parts on
this equipment.
Ensure main power supply to equipment, the heating
system, and all external controls has been deactivated.
Close main oil or gas supply valve. Take precautions to
avoid accidental activation of power during service work.
Please carefully read this manual prior to attempting
installation. Any warranty is null and void if these
instructions are not followed.
This product must be installed observing not only the
information and instruction provided in the pertinent
product literature (see list on the following page), but
also all local, provincial/state plumbing and building
codes, as they apply to this product and all periphery
equipment.
For information regarding other Viessmann System
Technology componentry, please reference
documentation of the respective product (available from
your Viessmann sales representative).
We offer frequent installation and service seminars to
familiarize our partners with out products. Please inquire.
The completeness and functionality of field supplied
electrical controls and components must be verified
by the heating contractor. These include low-water
cut-offs, flow switches (if used), staging controls,
pumps, motorized valves, air vents, thermostats,
temperature controls, etc.
Safety
Important Regulatory Requirements
CAUTION
The heating coil which is assembled with a rubber seal
and glue in the tank is sensible to high temperatures.
Exercise caution when welding and brazing: be sure not
to exceed a temperature of 302°F (150°C) in the NPT
fittings area.

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5813 312 - 01
Vitocell 300-W/V, EVIA/EVIB Installation, Operating and Service Safety
Important Regulatory Requirements (continued)
Technical literature
Literature applicable to all aspects of the Vitocell:
- Technical Data Manual
- Installation, Operating and Service Instructions
Leave all literature at the installation site and advise the
system operator/ultimate owner where the literature
can be found. Contact Viessmann for additional copies.
Instructing the system user
The installer of the system is responsible to ensure the
system operator/ultimate owner is made familiar with the
system functioning, its activation, and its shut-down.
The operator/ultimate owner should also be instructed to
complete and mail the warranty registration form in order
to be eligible for limited warranty.
Initial startup
Initial start-up must be performed by a qualified heating
contractor. Completion of the Maintenance Record by the
heating contractor is also required.
The following topics must be covered:
Proper system operation sequence.
Explain the equipment as well as the need for combustion
air. Demonstrate an emergency shut-down, what to do
and what not.
Explain that there is no substitute for proper maintenance
to help ensure safe operation.
The Maintenance Record is located on page 31 of this
manual.
Failure to abide by all the requirements set out in the
technical literature renders warranty null and void.
Operation
Please carefully read the operation and service sections of
this manual prior to operation.
The installer of the system is responsible to ensure the
system operator/ultimate owner is made familiar with the
system functioning, its activation, and its shut-down.
The operator/ultimate owner should also complete and
mail the warranty registration form in order to be eligible
for limited warranty.

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5813 312 - 01
Vitocell 300-W/V, EVIA/EVIB Installation, Operating and Service
About These Instructions
Product Information
Take note of all symbols and notations intended to draw attention to potential hazards or important product information.
These include “WARNING”, “CAUTION”, and “IMPORTANT”. See below.
Warnings draw your attention to the presence of
potential hazards or important product information.
Cautions draw your attention to the presence of
potential hazards or important product information.
Helpful hints for installation, operation or maintenance
which pertain to the product.
This symbol indicates that additional, pertinent
information is to be found.
This symbol indicates that other instructions must be
referenced.
WARNING
Indicates an imminently hazardous situation which, if
not avoided, could result in substantial product/property
damage, serious injury or loss of life.
CAUTION
Indicates an imminently hazardous situation which, if not
avoided, may result in minor injury or product/property
damage.
IMPORTANT

Vitocell 300-W, EVIA 42 USG (160 L) capacity
Vitocell 300-V, EVIA 53 USG (200 L) capacity
Vitocell 300-V, EVIA 79 USG (300 L) capacity
Vitocell 300-V, EVIB 119 USG (450 L) capacity
Indirect-fired domestic hot water storage tank with one
heat exchanger coil for use with hot water heating boilers,
residential/commercial heating plants, and low-temperature
heating systems.
This tank version is not suitable for steam heating
applications.
General Information
- Position tank carefully and remove packaging.
- Leave adequate clearance to the wall or other objects
enabling easy access to the pressure relief valve.
- Install tank(s) on flooring or foundation capable of
supporting the weight of the tank(s) filled with water.
Recommended service clearances
Rear in. (mm) 18 (460)
Sides May be reduced if rear pipe connections can
be reached with less clearance
in. (mm) 12 (300)
Top in. (mm) 12 (300)
Front in. (mm) 29 (730)
Minimum clearances to combustibles
All sides in. (mm) 0 (0)
Floor combustible
CAUTION
Install the DHW tank in a frost-protected and draft-free
room. Otherwise it must be drained when not in use, in
order to reduce the risk of damages caused by freezing.
Tank Setup

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5813 312 - 01
Vitocell 300-W/V, EVIA/EVIB Installation, Operating and Service
42 and 53 USG (160 and 200 L) Tank Connections
Installation
Legend
DHW Domestic Hot Water supply
RT Recirculation tapping (DHW)
TS DHW temperature sensor for boiler control
BWS Boiler Water Supply
BWR Boiler Water Return
DCW/D Domestic Cold Water supply/Drain
* Optional for Solar applications only.
Supplied component sizes Quantity
Part Size
ACap 1 in. NPT 1
BTee 1 in. NPT 1
C Reducer bushing 1 to cin. NPT 1
D Temperature and
pressure relief valve
cin. NPT 1
E Solar elbow* 1 in. NPT 1
Connections Size
BWS, BWR
DHW, DCW/D, RT
in. (male NPT)
in. (male NPT)
1
1
Legend
DHW Domestic Hot Water supply
RT Recirculation tapping (DHW)
TS DHW temperature sensor for boiler control
BWS Boiler Water Supply
BWR Boiler Water Return
DCW/D Domestic Cold Water supply/Drain
* Optional for Solar applications only.
Supplied component sizes Quantity
Part Size
ACap cin. NPT 1
BTee cin. NPT 1
C Solar elbow* 1 in. NPT 1
D Temperature and
pressure relief valve
cin. NPT 1
79 USG (300 L) Tank Connections
Connections Size
BWS, BWR
DHW, DCW/D, RT
in. (male NPT)
in. (male NPT)
1
c

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5813 312 - 01
Vitocell 300-W/V, EVIA/EVIB Installation, Operating and Service
119 USG (450 L) Tank Connections
Installation
* Optional for Solar applications only.
Legend
DHW Domestic Hot Water supply
RT Recirculation Tapping (DHW)
TS Clamp (behind the thermal insulation) for tank
Temperature Sensor or temperature controller
BWS Boiler Water Supply
BWR Boiler Water Return
DCW/D Domestic Cold Water supply/Drain
Supplied component sizes Quantity
Component Size
ACap 1 in. NPT 1
BTee 1ain. NPT 1
CReducer bushing 1ato cin. NPT 1
DTemperature and
pressure relief valve
cin. NPT 1
ESolar elbow* 1 in. NPT Optional
42 and 79 USG (160 and 300 L) Tank Installation
IMPORTANT
The temperature sensor for solar operation is included in
the solar control unit package.
The brass elbow with sensor well is available as an option
and must be used when solar connection is required.
Never wrap insulating tape around the sensor. Do not
install solar tank sensor anywhere other than the brass
elbow with sensor well.
1. For solar operation, install the sensor well into the
brass elbow and connect the assembly to the solar
return line.
2. Insert the temperature sensor until it bottoms out
inside the sensor well.
Temperature sensor installation for solar operation
Connections Size
BWS, BWR, RT
DHW, DCW/D
in. (male NPT)
in. (male NPT)
1
1a

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5813 312 - 01
Vitocell 300-W/V, EVIA/EVIB Installation, Operating and Service
42 and 53 USG (160 and 200 L) Tank Installation
Installation
Tank levelling
1. Level the DHW tank with its leveling bolts.
IMPORTANT
Do not extend the leveling bolts beyond an overall
length of 1½ in. (35 mm).
IMPORTANT
Never wrap insulating tape around the sensor.
1. Remove cover screw and remove top cover.
2. Route the sensor cable through the strain relief to
the sensor well.
3. Attach the strain relief to the sensor well.
4. Push the DHW #5 or temperature controller sensor.
to the bottom of the well.
5. Snug the strain relief screw. Do not overtighten to
damage the cable.
6. Insert the thermometer sensor Binto tank cap hole
and secure with the wing nut.
Temperature sensor installation (when using Viessmann
controls).
IMPORTANT
Due to the length of the stainless steel well 17fin.
(449 mm), care must be taken to ensure that the sensing
bulb of the sensor is inserted and pushed to the end of
the stainless steel well.
7. Reinstall top cover and secure with top cover screw.
Note: The tank comes with insulation jacket installed.
The temperature sensor well is installed and will
accept a supplied Viessmann 10K NTC sensor
with a Viessmann boiler or Viessmann control.
Note: For control by others the sensor bulb should be
ain. (6 mm) in diameter or cut out opening Aon
the flange insulation and push the high limit safety
cut-out sensor Binto the clamping bracket and
secure with supplied wing nut.

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5813 312 - 01
Vitocell 300-W/V, EVIA/EVIB Installation, Operating and Service
79 USG (300 L) Tank Installation
Installation
Fitting the flange cover
Installing the sensor well and the cylinder temperature sensor
Note: The sensor retainer is in the sensor well.
1. Remove the sensor retainer.
2. Fit the sensor to the outside of the sensor retainer
contact spring (not in the groove).
Note: The sensor must sit flush with the front of the spring.
3. Insert the sensor retainer with sensor into the
sensor well as far as it will go.

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5813 312 - 01
Vitocell 300-W/V, EVIA/EVIB Installation, Operating and Service Installation
119 USG (450 L) Tank Installation
CAUTION
The thermal insulation must not come in contact with
open flames. Exercise extreme caution when welding
and soldering.
1. Fit the thermal insulation blanket below the tank prior
to the installation of the tank itself.
Setting the DHW tank and fitting the thermal insulation
mat at the bottom
All necessary parts for enclosure assembly are packaged
in a separate carton.
1. Guide the thermometer sensor through the cover
strip and insert the thermometer.
Note: The cover strip is held in its vertical position
by the straight capillaries. This is necessary
for the rest of the installation.
2. Insert the upper thermometer sensor as far as it
will go into the hole in the tank cap.
3. Use clips to secure the thermometer sensor
against being pulled out.
4. Route the bottom thermometer sensor capillaries
to the back of the tank body.
5. Screw the nuts onto the threaded studs. Do not
tighten.
6. Push the clamps onto the threaded studs and
align.
7. Tighten the nuts.
8. Depending on where the sensor is being fitted:
Insert the thermometer sensors and tank
temperature sensors into clamp Aas far as they
will go.
Note: HNever wrap insulating tape around the
sensors.
HWhen the thermal insulation is being
fitted, the tank temperature sensor leads
are routed outwards through the apertures
(slots) in the rear cover strip.
HThe tank includes one (1) thermometer.
Fitting the thermometer sensor and tank temperature sensor

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5813 312 - 01
Vitocell 300-W/V, EVIA/EVIB Installation, Operating and Service
Installation
119 USG (450 L) Tank Installation (continued)
Fitting the thermal insulation jacket
Note:
HEnsure that no fleece remnants enter the DHW
tank through the tank connections.
H2 people are required for the following work.
1. At the back of the tank: Attach 6 clip fastenings
to the edges of the right and left sections of the
insulation jacket and lay the thermal insulation
jacket around the tank body.
Note: Leave the clip fasteners in the first notch.
2. At the front of the tank: Attach 6 clip fasteners
to the edges of the right and left sections of the
thermal insulation jacket.
3. Push the clip fasteners at the back of the tank
as close together as possible.
4. Push the clip fasteners at the front of the tank
as close together as possible.
Fitting the cover strips
1. Fit the thermal insulation jacket evenly around the
tank body by patting it.
2. Mount the front cover strip and flange cover.
3. Fit the rear cover strip.

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5813 312 - 01
Vitocell 300-W/V, EVIA/EVIB Installation, Operating and Service
Fitting the tank temperature sensor elbow for solar
operation (optional)
1. Seal threaded elbow and sensor well (accessories)
into the heating water return connection (solar
return).
2. Insert the tank temperature sensor (part of
solar control unit standard delivery) into the sensor
well as far as it will go and secure it against
slipping out.
Installation
119 USG (450 L) Tank Installation (continued)
Fitting the cover
Note: The soft side of the thermal insulation must rest
against the tank body.
Legend
A Cap with Viessmann logo
IMPORTANT
Never wrap insulating tape around the sensor. Do not
install solar tank sensor anywhere other than the brass
elbow with sensor well.

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5813 312 - 01
Vitocell 300-W/V, EVIA/EVIB Installation, Operating and Service
Boiler Water Connections (heat exchanger connection)
Legend
A Solar collector
B High limit safety cut-out
C Filling valve
D Solar-Divicon
E Vitocell 300-W, 300-V
F Individual DHW tank heating system
GAnti-scald tempering valve
1. For boiler water supply temperatures over 203°F (95°C):
Remove plastic supply and return grommets
(grommets are left-threaded).
2. Pipe supply line with an incline and install an air vent
valve at the highest point.
3. For boiler water supply temperatures over 230°F
(110°C):
Install a type-tested high limit safety cut-out, if no other
has previously been installed in this system. For this
purpose, install a dual thermostat (high limit thermostat
and high limit safety cut-out).
4. Close off test nipples which are not used for the
installation of a probe or sensor.
Recommended piping for solar application with an additional tank
WARNING
Due to the potentially high DHW temperatures generated
by the solar heating system, the domestic hot water
temperature must be limited to a maximum of 140ºF
(60ºC) by installing a anti-scald tempering valve. The
tempering valve does not completely eliminate the risk
of scalding at the tap. The installation of a mixing tap is
recommended.
Installation
Note: Tee with sensor well for solar return must be
ordered separately.

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5813 312 - 01
Vitocell 300-W/V, EVIA/EVIB Installation, Operating and Service Installation
Domestic Water Connections
Note: - Connect all pipe work with detachable fittings.
- Seal connections that are not required with brass
caps.
- Equip the DHW circulation pipe with circulation
pump, check valve and time switch. Gravity
operation is only feasible to a limited degree.
- Always install DHW group of tanks with
connected DHW circulation.
1. Pipe together boiler and tank as illustrated. Connections
must be accessible for service (use factory supplied
adaptors).
2. Insulate domestic hot water supply piping.
Legend
A Spring-loaded flow check valve
B Discharge pipe
C Anti-scald tempering valve (field supplied)
SV Shut-off valve
FV Flow check valve
PR Pressure reducing valve
D Drain
DCW Cold water supply lines
PGC Pressure gage connection
E Precharged expansion tank (required where backflow
preventer is installed; check local plumbing codes
and requirements)
BP1 Backflow preventer
BP2 Backflow preventer
T&P Temperature and pressure relief valve
DW Water filter
DHW Domestic hot water supply
RP Recirculation pipe
RPU Recirculation pump
IMPORTANT
This is a simplified conceptual drawing only! Piping and
necessary componentry must be field verified. Proper
installation and functionality in the field are the responsibility
of the heating contractor.

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5813 312 - 01
Vitocell 300-W/V, EVIA/EVIB Installation, Operating and Service
Installation
Domestic Water Connections (continued)
WARNING
The valve test lever must be operated at least once per
year by the owner to ensure that waterways are clear.
A licensed professional heating contractor shall reinspect
the T&P valve at least once every three years. Failure
to inspect can result in unsafe temperature or pressure
build-up, which can result in death, serious injury or
substantial product/property damage.
Proper installation of the T&P valve shall include all of the
following:
- The T&P valve shall be installed in the pipe connection
point as shown in this manual.
- The discharge line from the T&P valve shall be 7 ¾ in.
(19 mm) and run to a safe place of discharge
approximately 1 ft. (305 mm) above the floor, close to
a floor drain.
- The discharge line must be as short as possible and
pitch downward from the T&P valve and terminate plain
not threaded.
Always ensure the use of type approved devices.
Safety devices include the following components:
- Isolation valves
- Drain valve
- Pressure reducing valve
where required by local jurisdiction
- Drinking water filter
where required by local jurisdiction
- Backflow preventer
Where backflow preventers are required, a domestic
water expansion tank installation is required in the
cold water inlet piping before the cold water enters
the tank. The backflow device must be installed
according to the manufacturer’s installation
instructions. Observe local codes and regulations.
- Tempering valve
A tempering valve must be field installed where
storage tank (domestic hot water temperature)
exceeds local restricted temperatures or 140°F
(60°C). Check code requirements.
IMPORTANT
In situations where a booster pump is used to maintain
DHW pressure, Viessmann strongly recommends the
installation of an oversized large expansion tank to
ensure longer, less frequent pump cycles with less
severe pressure gradients. If possible, use flexible piping
before and after booster pump to isolate system piping
from vibration and shocks.
WARNING
The discharge line for the T&P valve must be oriented to
prevent scalding of attendants.
- Do not route discharge line directly to the outdoors.
- Do not install any type of valve or restriction of any
kind between the tank and the T&P valve, or
between the T&P valve and the discharge line outlet.
- Temperature and pressure relief valve
A temperature and pressure relief valve (T&P valve)
is supplied with the tank. The heating contractor must
install the valve on each tank in a method meeting
code requirements.
If local codes require a different relief valve, consult
Viessmann Manufacturing for a substitute valve.
The tank is approved for 150 psig. Maximum operating
pressure is 150 psig.
The T&P valve supplied with the tank is tested under
ANSI Z21.22 Code for Relief Valves and Automatic
Gas Shut-off Devices for Hot Water Supply Systems.
T&P Valve set pressure 150 psig
CSA discharge capacity 205 MBH*
Relief temperature 210°F (99°C)
Inlet thread c” male
Outlet thread c” female
*105 MBH for 42 USG (160 L)

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5813 312 - 01
Vitocell 300-W/V, EVIA/EVIB Installation, Operating and Service
42 to 79 USG (160 to 300 L) Pressure Drop Information
Additional Information
Pressure drop on the heating water side Pressure drop on the domestic hot water (DHW) side
Legend
A42 and 53 USG (160 and 200 L) capacity
B79 USG (300 L) capacity
Legend
A42 and 53 USG (160 and 200 L) capacity
B79 USG (300 L) capacity
Pressure Drop
Heating Water Flow Rate
DHW Flow Rate
Pressure Drop

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5813 312 - 01
Vitocell 300-W/V, EVIA/EVIB Installation, Operating and Service
119 USG (450 L) Pressure Drop Information
Additional Information
Pressure drop on the heating water side Pressure drop on the domestic hot water (DHW) side
Legend
A119 USG (450 L) capacity
Legend
A119 USG (450 L) capacity
Pressure Drop
Heating Water Flow Rate
DHW Flow Rate
Pressure Drop

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5813 312 - 01
Vitocell 300-W/V, EVIA/EVIB Installation, Operating and Service Operation
Domestic Hot Water Production
Ensure the instructions and requirements
of the boiler control and system accessories
are observed.
Domestic hot water production can occur via heating
boiler, a remote heating plant or low temperature heating
via bivalent operation.
The maximum heating supply temperature is 320°F
(160°C), the maximum operating pressure is 150 psig on
the tank.
Domestic hot water production
1. Set the desired domestic hot water temperature
(140°F (60°C) for example) on the operating control
of the heating system.
2. The supply temperature for domestic hot water
production is set on the heating system operating
control. It should be approximately 27°F (15°C)
above the desired domestic hot water temperature.
3. For your personal safety, we recommend the
installation of a tempering valve to restrict the entry
of excessively hot domestic hot water into the system.
Hire a qualified heating contractor.
IMPORTANT
Domestic hot water may be preheated or heated to
temperatures over 113°F (45°C) depending on system
energy output and temperature characteristics.
WARNING
Domestic hot water temperatures over 125°F (52°C)
can cause severe burns instantly or death from scalds.
Children, disabled and elderly are at highest risk of being
scalded. Feel water before bathing or showering.
Temperature limiting valves are available and must be
used where domestic hot water storage tank temperature
exceed 140°F (60°C).
Initial Start-up
1. Fill tank with domestic drinking water.
2. Check heating side and domestic water side adaptors
for leaks. Tighten if necessary.
3. Ensure that DHW tank temperature sensor is properly
inserted into the mounting clamp.
4. Verify proper operation of temperature and pressure
relief valve (T&P valve).
5. Activate power supply.

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5813 312 - 01
Vitocell 300-W/V, EVIA/EVIB Installation, Operating and Service
Shutdown
Temperature and Pressure Relief Valve
If domestic hot water production is not desired and the
risk of freezing temperatures in the mechanical room
exists, please contact your heating contractor.
HEnsure there is never any type of valve or restriction
of any kind between the tank and the temperature and
pressure relief valve (T&P valve), or between the T&P
valve and the discharge line outlet.
The discharge line must be oriented to enable
unobstructed and visible flow of discharge water
toward a floor drain.
HIf you observe water being released out of the
discharge pipe of the temperature and pressure relief
valve, contact your heating contractor immediately.
HThe valve test lever must be operated at least once
per year by the heating contractor to ensure that
waterway are clear. A licensed professional heating
contractor shall reinspect the T&P valve at least once
every three years. Failure to inspect can result in
unsafe temperature or pressure build-up, which can
result in substantial product/property damage, serious
personal injury or loss of life.
WARNING
The possibility of mineral build-up on the T&P valve seat
exists. Report dripping or discharges from the T&P valve
to the heating contractor immediately.
Operation