Ariston VLS Flat 50 User manual

Technical Manual
Storage Electric Water Heaters - VLS
Date of issue: 29
th
July 2011
Updating date: 10
th
November 2011 Version: v_2 1
Because of continuing product improvements, Ariston Thermo reserves the right to change specifications without prior notice.

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Table of contents
1. General information
1.1 Main features by version
1.2 Differences among versions
1.3 Technical drawings
1.4 Product dimensions
1.5 Technical stickers
2. Components
2.1 Packaging content
2.2 Tanks
2.3 Heating elements
2.4 Mg anode
2.5 Power board, connections and probes
2.6 HMI
3. Working modes and additional functions
3.1 Main features by version
3.2 Programming
3.3 ECO
3.4 ECO PLUS
3.5 Anti bacteria
4. Troubleshooting and maintenance
4.1 Displayed faults
4.2 Malfunctioning
4.3 Routine maintenance

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1. General information
1.1 Main features by version
VLS
The most common version: half size, double comfort.
Characterized by the “SHOWER READY” icon on the button HMI,
this appliance is able to ensure hot water for the first shower in
the fastest way, half time versus traditional water heater. The
ECO function, learning by end user habits, allows to save energy
consumption and money expenses … all in only 270 mm deep.
Available in: Italy, East Europe, Iberian Peninsula, Balkans, North
Africa.
VLS PREMIUM
The TOP version: fashion design and programmable comfort.
Characterized by the rotational LCD display on the soft touch
HMI and by the front panel available in seven different colors,
this appliance is able to ensure the same performance and
functioning modes of VLS.
Moreover the end user can program the desired temperature
and the time at which hot water has to be ready.
Available in: East Europe.

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1.2 Differences among versions
VLS VLS PREMIUM
Capacities
50 litres
yes
yes
80 litres
yes
yes
100 litres
yes
yes
Design
Button HMI
yes
no
Soft touch HMI
no
yes
Front panel
no
7 colours available
Electronic
control
Power board
yes
yes
HMI board
yes
with LCD display
Heating element
HE1 (1’500 W, 230 V)
yes
yes
HE2 (1’000 W, 230 V)
yes
yes
Protection
Mg anode (30
50 l)
n° 2 (22 x 110)
n° 2 (22 x 110)
Mg anode (80
100 l)
n° 2 (25,5 x 190)
n° 2
(25,5
x
190)
Safety valve
8 bar
8 bar
Power cable
ELCB
no (standard cable)
no (standard cable)
Functions
Anti
bacteria
disabled by default
disabled by default
ECO
yes
yes
ECO PLUS
no
yes
Programming
no
yes
Markets
Italy
yes
no
East Europe
yes
yes
Iberian Peninsula
yes
no
Turkey
yes
no
Balkans
yes
no
North Africa
yes
no

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1.3 Technical drawings
VLS VLS PREMIUM
1.4 Product dimensions
All the dimensions are measured in mm.

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1.5 Technical stic ers
Multi position installation sticker
The product may be installed either vertically or
horizontally.
Warning: In the horizontal installation, rotate the
appliance clockwise so that the water pipes are on
the left (cold inlet water pipe at the bottom).
Front panel assembly explanation sticker
The PREMIUM versions could be personalized with
seven different colours front panel. The sticker
explains how to do this assembly.

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2. Components
2.1 Pac aging content
Into the packaging, the following items are included:
FLAT Water Heater version choosen (power cable is already installed);
Only in PREMIUM versions, basic front panel to be mounted;
Safety valve (8 bar) to be installed on cold water inlet pipe (note: this component must be replaced
with a device in compliance with the EN 1487:2002, if this standard is mandatory in your Country);
Instruction manual.
2.2 Tan s
Tanks tailored design and serie connection between
them in order to reach the highest level of heat
stratification and the lowest depth size.
Same tanks flange for all the range: 5 bolts.
Same tanks diameter for all the range: 220 mm.
Different length by capacity.
Spare parts of these items are not available!
2.3 Heating elements
HE1 HE2
All the range is equipped with two heating
elements: the HE1 (red coloured), closer to the hot
water outlet pipe, is used to ensure hot water for
the first shower in the fastest way while the HE2
(blue coloured), closer to the cold water inlet pipe,
is used to maximize the comfort.
2.4 Mg anode
The Mg anode prevents corrosion of the tank and
the heating element.
Each tank is equipped with a specific anode
according to its capacity.

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2.5 Power board, connections and probes
main power board (PCB)
power cable (PCB HE1: red; PCB HE2: blue)
HE1 probe with cable (width = 8 mm)
HE2 probe with connector (width = 6,5 mm)
HE2 probe cable
Sensor Test Table (ohmic resistance values as a function of temperature)
T [ C]
R [kΩ]
T [ C]
R [kΩ]
T [ C]
R [kΩ]
T [ C]
R [kΩ]
T [ C]
R [kΩ]
T [ C]
R [kΩ]
40
195,7
10
42,5
20
12,1
50
4,2
80
1,7
110
0,8
35
148,2
5
33,9
25
10,0
55
3,5
85
1,5
115
0,7
30
113,3
0
27,2
30
8,3
60
3,0
90
1,3
120
0,6
25
87,6
5
22,0
35
6,9
65
2,6
95
1,1
125
0,5
20
68,2
10
17,9
40
5,8
70
2,2
100
1,0
15
53,6
15
14,7
45
4,9
75
1,9
105
0,9

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If the PCB has to be replaced, it’s mandatory to set the jumpers present on the geniune spare part as a
function of the product capacity, following logical schemes below:
FLAT 50 litres
FLAT 80 litres
FLAT 100 litres
2.6 HMI
VLS
Buttons: ON/OFF, “ECO”, +/
Icons: “WAVES” (40 °C, 50 °C, 60 °C, 70 °C, 80 °C),
“SHOWER READY”
VLS PREMIUM
LCD display
“SET” knob
Buttons: ON/OFF, “MODE”, “ECO”
Icons: “WAVES”

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3. Working modes and additional functions
3.1 Main features by version
Press the ON/OFF button to switch on/off the appliance.
VLS
Working
During the heating phase, the
“WAVES” icon
corresponding to the
temperature reached by the water so far remain light in a fixed manner; all
subsequent “WAVES” icons (up to the set temperature) flash progressively.
Whatever the temperature set by the user, the “SHOWER READY” icon lights
up when there is sufficient hot water for at least one shower (40 litres of
water mixed at 40 °C).
How to change
the hot water set point
Press +/
buttons in order to increase/decrease the set
point (40 °C
80 °C):
the select set point value is displayed by fixed light waves and temperature.
Default settings
Hot water set
point = 70 °C
Anti bacteria function deactivated
ECO function deactivated
VLS PREMIUM
Working
During the heating phase, the
“WAVES” icons
on display side are switched on
and the temperature reached by the water so far is shown on the LCD display.
Whatever the temperature set by the user, the “shower ready” symbol is
shown on the LCD display when there is sufficient hot water for at least one
shower (40 litres of water mixed at 40 °C).
How to change
the hot water set point
(MANUAL mode)
Turn the “SET” knob clockwise/anticlockwise
in order to increase/decrease
the set point (40 °C 80 °C): the select set point value is shown flashing on
the LCD display; to confirm the displayed value, press the “SET” knob.
Default settings
Hot water set
point = 70 °C
Anti bacteria function deactivated
ECO function deactivated
In any setting procedure (except for the local time), if the user does not perform any actions for 5 seconds,
the last settings are stored in the appliance memory. If the product is disconnected by the power mains for
a long period, all the settings are stored into the appliance memory (except for the local time).
3.2 Programming
Only for PREMIUM versions, Programming modes are alternative to the MANUAL mode.
The functions “Programming 1” (“P1” symbol lit on the LCD display), “Programming ” (“P ” symbol lit on
the LCD display) and “Programming 1 and ” (“P1” and “P ” symbols lit on the LCD display) can be used to
programme 1 or time bands for the day on which hot water is required.
VLS PREMIUM
How to change
the working mode
Press the
“MODE
” button
to select
a different operating mode (the mode is
indicated by the flashing of the corresponding symbol/symbols on the display).
Functions are selected on a cyclic basis, in the following order: “P1”  “P2” 
“P1 and P2”  “MANUAL”  “P1”  etc.