Viessmann VITOWELL comfort User manual

0
Installation And Operation Manual
STORAGE ELECTRIC WATER HEATER
Contents

1
Contents
Safety-------------------------------------------------------------------------------2
General warnings-------------------------------------------------------------------------------------2
Key to symbols----------------------------------------------------------------------------------------4
General safety norms--------------------------------------------------------------------------------5
Specific safety norms for this appliance---------------------------------------------------------7
Appliance description---------------------------------------------------------8
Appliance profile--------------------------------------------------------------------------------------8
Appliance norms-------------------------------------------------------------------------------------12
Appliance installation--------------------------------------------------------13
Packing list--------------------------------------------------------------------------------------------13
Installation norms (for the installer) ------------------------------------------------------------14
Installing the appliance----------------------------------------------------------------------------15
Installation steps------------------------------------------------------------------------------------16
User instructions--------------------------------------------------------------20
Advice for user---------------------------------------------------------------------------------------20
Control and operating instructions--------------------------------------------------------------21
Wiring diagram and technical parameters----------------------------27
Wiring diagram---------------------------------------------------------------------------------------27
Technical parameters------------------------------------------------------------------------------28
Maintenance instructions---------------------------------------------------30
Maintenance regulations--------------------------------------------------------------------------30
Cleaning the outer parts---------------------------------------------------------------------------30
Safety valves-----------------------------------------------------------------------------------------30
Periodic maintenance------------------------------------------------------------------------------31
Troubleshooting---------------------------------------------------------------32
Fault analysis-----------------------------------------------------------------------------------------33

2
Safety
Safety
General warnings
1. This manual is an integral and essential part of the appliance. It should be
preserved with care and transferred alongside the appliance if the latter is
transferred to another owner or user and/or moved to another location.
2. Carefully read the instructions and warnings contained in this manual. They
provide important information for the safe installation, use and maintenance of your
new appliance.
3. The installation should be performed by a competent person in accordance with
the instructions contained herein.
4. The use of this appliance for purposes other than those specified is strictly
forbidden. The manufacturer is not to be held responsible for any damage due to
improper, incorrect and unreasonable use or due to failure to comply with the
instructions set forth herein.
5. Installation, maintenance and all other interventions must be carried out by a
competent person in full conformity with the applicable legal regulations and the
directions provided by the manufacturer.
6. Incorrect installation can cause personal injury, property damage and damage to
animals. The manufacturer will not be held responsible for such damage.
7. Keep all packing material (clips, plastic bags, polystyrene foam, etc.) out of
children's reach as they are hazardous.

3
Safety
Safety
8. 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 to ensure that they
do not play with the appliance.
9. It is strictly forbidden to touch the appliance barefoot or with wet hands or feet.
10. All repairs should be carried out by a competent person only, using only original
spare parts. Failure to comply with the above instructions could compromise safety
and invalidate all liability on the part of the manufacturer.
11. The appliance electrical connection should be made in accordance with the
related provisions herein.
12. If the device that safeguards against excess pressure is supplied with the
appliance, it must not be tampered with and must be promptly replaced with
appropriate devices if it is not in accordance regulations and legislation.
13. No inflammable items should be left in the vicinity of the appliance.

4
Safety
Safety
Key to symbols
Symbol
Meaning
Failure to comply with this warning implies the risk of personal injury and even
death in some circumstances.
Failure to comply with this warning implies the risk of damage and even serious
damages to property, plants or animals in some circumstances.
It is obliged to keep to the general safety norms and appliance specifications.

5
Safety
Safety
General safety norms
Ref.
Warning
Risk
Symbol
1
The heater must be fitted with
reliable grounding. Do not use the
heater without any reliable
grounding. Do not connect the
grounding wire to the zero line or
water pipe.
Electrocution
2
Do not open or remove the
appliance.
Electrocution from live components;
personal injury from burns due to
overheated components or wounds
caused by sharp edges or
protrusions.
3
DO not use a 13A socket which may
cause your wires to overheat, melt
and fuse together, leading to a short
circuit. It should be wired directly to a
heater switch which is able to
support higher current. The
installation and set-up of the water
heater must be carried out by a
competent person in conformity with
the applicable norms in force and
with any provisions set forth by local
authorities and public health bodies.
Electrocution from a damaged cable
or plug, or socket.

6
Safety
Safety
Ref.
Warning
Risk
Symbol
4
Do not damage the power supply
cable.
Electrocution from live unsheathed
wires.
5
Do not leave anything on top of the
appliance.
Personal injury from an object falling
off the appliance following vibrations
Damage to the appliance or any
objects underneath it due to the
object falling off following vibrations.
6
Do not climb onto the appliance.
Personal injury due to the appliance
falling.
Damage to the appliance or any
objects underneath it due to the
appliance falling off from its place of
installation.
7
Do not attempt to clean the
appliance without first turning it off
and unplugging it or switching the
dedicated switch off.
Electrocution from live components.
8
Install the appliance on a solid wall
that is not subjected to any
vibrations.
Appliance falling due to the wall
giving way, or excessive noise
during operation.
9
Make all electrical connections using
conductors with a suitable section.
Fire due to overheating from
electrical current passing through
undersized cables.

7
Safety
Safety
Ref.
Warning
Risk
Symbol
10
Reset all the safety and control
functions affected by any intervention
performed on the appliance and
make sure they operate correctly
before re-using the appliance.
Damage or shutdown of the
appliance due to out-of-control
operation.
Specific safety norms for this appliance
Ref.
Warning
Risk
Symbol
11
Before handling, empty all
components that may contain hot
water.
Personal injury from burns.
12
Descale the components, in
accordance with the instructions
provided on the “safety data sheet"
of the product used, air the room,
wear protective clothing, avoid
mixing different products, and protect
the appliance and surrounding
objects.
Personal injury due to contact of the
skin or eyes with acidic substances,
inhalation or swallowing of harmful
chemical agents.
Damage to the appliance or
surrounding objects due to corrosion
caused by acidic substances.
13
Do not use any insecticides, solvents
or aggressive detergents to clean the
appliance.
Damage to the plastic and painted
parts.

8
Appliance description
Appliance description
Appliance profile
Cube Series
Cube type C1 (Comfort)：
1 Upper panel 5 Hot water outlet
2 LED 6 Cold water inlet
3 Bottom panel 7 Housing-rear
4 Temperature knob
Model
A
B
C
D
E
15L Cube
C1
390mm
360mm
340mm
100mm
84mm
30L Cube
C1
471mm
439mm
395mm
100mm
100mm

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Appliance description
Appliance description
Cube type P1 (Premium)：
1 Upper panel 5 Hot water outlet
2 LED 6 Cold water inlet
3 Bottom panel 7 Housing-rear
4 Temperature knob
Model
A
B
C
D
E
15L Cube P1
390mm
360mm
340mm
100mm
84mm
30L Cube P1
471mm
439mm
395mm
100mm
100mm

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Appliance description
Appliance description
Cube type D1 (Deluxe)：
1 Upper panel 4 Hot water outlet
2 Bottom panel 5 Cold water inlet
3 Control panel 6 Housing-rear
Model
A
B
C
D
E
15L Cube
D1
390mm
360mm
340mm
100mm
84mm
30L Cube
D1
471mm
439mm
395mm
100mm
100mm

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Appliance description
Appliance description
Slim Series
Slim type C1 (Comfort):
1 Left panel 5 Right panel
2 Magnesium anode connector 6 Temperature knob
3 Hot water outlet 7 LED
4 Cold water inlet 8 Housing-rear
Model
A
B
C
D
E
20L Slim C1
630mm
280mm
280mm
100mm
140mm

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Appliance description
Appliance description
Appliance norms
Implementation norms
IEC60335-1 Safety of household and similar electrical appliances---General
requirements
IEC60335-2-21 Household and similar electrical appliances---Safety---Particular
requirements for storage water heaters

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Appliance installation
Appliance installation
Packing list
All water heaters are shipped with the following items. Please check them before
installation.
No.
Component description
Qty.
1
Water heater
1 set
2
User’s manual
1 copy
3
User service guide
1 copy
4
Expansion tube
2 pcs（Slim：3pcs）
5
Screw
2 pcs （Slim：3pcs）
6
One-way safety relief valve
1 pc
7
Drainage pipe
1 pc
8
Hanging board
1 pc

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Appliance installation
Appliance installation
Installation norms (for the installer)
Follow the general warnings and the safety norms listed at the
beginning of the text and keep to all the instructions given under all
circumstances.
The installation and set-up of the water heater must be carried out by a
competent person in conformity with the applicable norms in force and with
any provisions set forth by local authorities and public health bodies.
The heater must be fitted with reliable grounding. Do not use the heater
without any reliable grounding. Do not connect the grounding wire to the zero
line or water pipe.
The appliance heats water to a temperature below boiling point. It must be linked up
to a mains water supply according to the appliance performance levels and
capacity.
Before connecting the appliance, it is first necessary to:
■Check whether the appliance characteristics (please refer to the data plate) meet
the customer’s requirements.
■Make sure the installation conforms to the IP degree (of protection against the
penetration of liquids) of the appliance according to the applicable norms in force.
■Read the instructions provided on the packaging label and on the appliance data
plate.

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Appliance installation
Appliance installation
Installing the appliance
This appliance is designed to be installed only inside buildings in compliance with
the applicable norms in force.
Furthermore, installers are requested to keep to the following advice in the
presence of:
■Damp:do not install the appliance in closed (unventilated) and damp rooms.
■Sunlight:do not expose the appliance to direct sun rays, even in the presence of
windows.
■Dust/vapor/gas: do not install the appliance in the presence of particularly
dangerous substances such as acidic vapor, dust or those saturated with gas.
■Electrical discharges: do not install the appliance directly on electrical supplies
that aren’t protected against sudden voltage jumps.
In the case of walls made of bricks or perforated blocks, partition walls featuring
limited static, or masonry different in some way from those stated, you first need to
carry out a preliminary static check of the supporting system.
The wall-mounting fastening hooks must be designed to support a weight that is
three times higher than the weight of the water heater filled with water.
Local norms could set forth restrictions regarding the installation in a bathroom
environment. Therefore keep to the minimum distances foreseen by the applicable
norms in force.
The appliance should be installed not too far from the point of use to limit heat
dispersion along the piping.
Allow for a clearance of at least 50 cm to provide access to the electrical
components, thus facilitating the maintenance activities.

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Appliance installation
Appliance installation
Installation steps
1. Installing the expansion-bolt hooks
Cube type
Drill two Φ10mm x 85mm holes in the wall as shown in the figure. Insert the
expansion pipe into the hole, put the screw through the hanging plate, and tighten
the screw with a screwdriver, and the hanging plate direction is vertical upward (as
shown in the figure).
Slim type
Drill three Φ10mm x 85mm holes in the wall as shown in the figure. . Insert the
expansion pipe into the hole, put the screw through the hanging plate, and tighten
the screw with a screwdriver, and the hanging plate direction is vertical upward (as
shown in the figure)

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Appliance installation
Appliance installation
2. Removing the baffle plate
Pry up the plastic baffle plate covering hanging holes with a slotted screwdriver, as
shown in the right figure, and keep hanging holes visible.
3. Hanging the water heater
Lift the water heater, align the square holes on the back with the hooks and attach
them. Then pull down the water heater to ensure the secure installation.
In order to facilitate installation and maintenance operation, space should be left
above and on both sides of the water heater. The distance between the left and right
sides of the water heater should not be less than 150 mm from the wall, and the
distance between the top and the wall or ceiling should not be less than 150 mm.

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Appliance installation
Appliance installation
4. Hydraulic connection
Connect the water heater’s inlet and outlet with pipes or fittings that are able to
withstand temperature in excess of 80°C at a pressure above the working pressure.
Therefore, we advise against the use of any materials which cannot resist such high
temperatures.
Connect the hydraulic line as shown in the figure. The outlet is on the left (red) and
the inlet is on the right (blue). Do not over-tighten the safety valve or alter the
position of the safety valve without authorization. A cold pipe is connected under the
valve and a hot pipe is connected with the valve outlet. (Wrap all hydraulic
connections with PTFE tape.) Fill the appliance with water and check if the appliance
or the hydraulic line leaks. If no leakage is detected, switch on the electricity mains
and start the trial run.
If the network pressure is closed to the rated valve pressure, it will be necessary to
apply a pressure reducer far away from the appliance.
To avoid any possible damage to the mixer units (taps or shower), it is necessary to
drain any impurities from the pipes. Otherwise, impurities may cause damages to the
mixer units.

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Appliance installation
Appliance installation
5. Electrical connection
Before performing any operations, disconnect the appliance from the
electricity mains using the external switch.
For greater safety, authorize qualified personnel to carry out a careful inspection of
the electrical system, ensuring it complies with the applicable norms in force,
because the appliance manufacturer will not be held responsible for any damage
caused by the lack of earthing of the system or for improper wiring.
Check that the supply system is suitable for the maximum power absorbed by the
water heater (please refer to the data plate) and that the cross-section of the
electrical connection cables is suitable and complies with current laws.
The use of multi-plugs, extensions or adaptors is strictly prohibited.
It is strictly forbidden to use the piping from the plumbing, heating and gas systems
for the appliance earthing connection.
6. Starting and testing the appliance
Before powering the appliance, fill the tank up with water.
The filling is carried out by turning on the domestic mains tap and the hot water tap,
until the air is completely released.
Visually check for water leaks, including flanges, and slightly tighten it if necessary.
Turn the knob to adjust the temperature (Eco position recommended). The red color
heating LED keeps on during the water heating process. After the preset working
temperature is reached, the thermostat will stop the heating element automatically.