Dražice OKHE 80-SMART Specification sheet

OPERATING and
INSTALLATION MANUAL
TANK-TYPE WATER HEATER FOR VERTICAL
MOUNTING
OKHE 80,100,125,160-SMART
Družstevní závody Dražice-strojírna s.r.o.
(Works Cooperative - Dražice – Machine Plant, Ltd.)
Dražice 69, 294 71 Benátky nad Jizerou
tel.: +420 / 326 370 911
fax: +420 / 326 370 980
e-mail: [e-mail]

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CONTENTS
1technical specification of product ............................................................................................................5
1.1 Function description .......................................................................................................................5
1.2 ADVICE FOR CUSTOMERS................................................................................................................5
1.2.1 Hot water consumption ..............................................................................................................5
1.2.2Energy saving ..............................................................................................................................5
1.2.3 Emergency power consumption .................................................................................................5
1.3 design and general heater dimensions ...........................................................................................6
2OPERATION AND FITTING INSTRUCTIONS ................................................................................................7
2.1 Operating conditions.......................................................................................................................7
2.2 WALL MOUNTING ...........................................................................................................................8
2.3 PLUMBING FIXTURE ........................................................................................................................8
2.4 Electric wiring..................................................................................................................................9
2.4.1 ELECTRIC INSTALLATION gENERAL INFORMATION .....................................................................9
2.4.2 METHODS OF ELECTRONIC THERMOSTAT CONNECTION..........................................................10
2.5 FIRST HEATER COMMISSIONING ...................................................................................................13
2.6 Putting out of service, discharge ...................................................................................................14
2.7 Inspection, maintenance & care for the appliance .......................................................................14
2.8 MOST FREQUENT FUNCTION FAILURES AND THEIR CAUSES.........................................................15
3. OPERATION OF Thermostat....................................................................................................................15
3.1 OperatinG MODES.........................................................................................................................16
3.1.1 NORMAL ...................................................................................................................................16
3.1.2 HDO ..........................................................................................................................................16
3.1.3 ECO ...........................................................................................................................................16
3.1.4 Smart ........................................................................................................................................16
3.1.5 Smart HDO ................................................................................................................................16
3.1.6 prog/Antifrost ...........................................................................................................................16
3.1.7 Stop...........................................................................................................................................16
3.2 DISPLAY .........................................................................................................................................17
3.3 CONTROL.......................................................................................................................................18
3.3.1 thermostat MODE settinG ........................................................................................................18
3.3.2 STANDARD DISPLAY MODE .......................................................................................................19
3.3.3 setting MODE............................................................................................................................19

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4Important NoticeS ..................................................................................................................................21
4.1 Installation regulations..................................................................................................................21
4.2 Disposal of packaging material and functionless product .............................................................22

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Meaning of pictograms used in Manual
Important information for heater users.
Recommendations of manufacturer, observance of which will ensure trouble-free
operation and long service life of the product.
CAUTION!
Important notice to be observed.
READ CAREFULLY THE BELOW INSTRUCTIONS PRIOR TO THE INSTALLATION THE
HEATER!
Dear Customer,
The Works Cooperative of Dražice – Machine Plant, Ltd., would like to
thank you for your decision to use a product of our brand. With this
guide, we will introduce you to the use, construction, maintenance and
other information on electrical water heaters.
The manufacturer reserves the right for engineering modification of the product. The product is designed
for permanent contact with drinkable water.
It is recommended to use the product in indoor environment with air temperatures from +2°C to 45°C
and a relative humidity up to 80%.
Product’s reliability and safety is proven by tests implemented by the Engineering Test Institute in Brno.
This product contains an electrostatic sensitive component (electronic thermostat). During the
mounting or maintenance of this product please follow general principles described in the EN/IEC
61340 series standard –Electrostatics and related standards.

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1TECHNICAL SPECIFICATION OF PRODUCT
1.1 FUNCTION DESCRIPTION
The heater is designed for accumulation heating of service water using electricity. Water is heated by an
electric element in an enamelled thermally insulated tank. At the time of heating, the element is controlled
by an electronic thermostat E1 that provides multiple operation modes, including comfort functions. The
thermostat carries a display, and setting is performed by means of five keys (arrows + OK). Once the
selected temperature is reached, heating interrupts automatically. Water accumulated in the tank is then
used for the consumption. The tank keeps constant pressure of water from the water main. If the
combination faucet hot water valve is opened, water from the water supply conduit pressed out by cold
water pressure flows out of the heater. Hot water flows out through the top part, and inflowing water
remains in the bottom part of the heater.
1.2 ADVICE FOR CUSTOMERS
1.2.1 HOT WATER CONSUMPTION
Consumption of hot water in households depends on the number of people, amount of
sanitary equipment, length, diameter and insulation of piping in the flat, or on individual
habits of users. The cheapest option of water heating comes at the time when the
electricity rate is reduced.
Find out in what time intervals your electricity supplier provides reduced tariff and,
depending on that information, select relevant volume and power input of the heater so that
your hot water consumption covered the needs of your household.
1.2.2 ENERGY SAVING
Adjust the temperature of the heater's thermostat to that level only that you need to run
your home. Thus you will reduce electricity consumption, as well as the amount of lime
sediments on the walls of the receptacle and on the electric element's pit. To achieve higher
electricity savings use one of the smart operation modes - SMART, SMART HDO (refer to
chapter 3 “Thermostat operation” for more information on the operation modes).
1.2.3 EMERGENCY POWER CONSUMPTION
If no heated water is taken from the tank, a small amount of heat leaks. This loss is
measured for a period of 24 hours at the temperature of 65°C in the heater, and at 20°C in
its ambient area. The resulting value is expressed in [kWh/24h] and indicates the amount of
power needed to maintain the set temperature. Data Sheet pursuant to Directive No
442/2004 Coll. and Annex No 7; see Table 1 .

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MODEL
OKHE 80-
SMART
OKHE 100-
SMART
OKHE 125-
SMART
OKHE 160-
SMART
UNIT HEAT LOSSES [kWh/24hr/l]
6.88
7
6.6
6.77
NOMINAL CAPACITY [l]
80
100
125
155
TIME OF WARMING UP CONTENT OF
TEMPERATURE ∆T=50°C [hours]
2.5
3
3,8
5
ELECTRICITY CONSUMPTION FOR
WARMING CONTENTS FROM 15°C TO 65°C
[kWh]
4.8
6
8
9.5
TOTAL HEAT LOSSES [kWh/24hr]
0.55
0.7
0.87
1.05
Table 1
1.3 DESIGN AND GENERAL HEATER DIMENSIONS
The heater tank is made of a steel plate and tested by 0.9 MPa overpressure. The inside of the tank is
enamelled. A flange is welded onto the bottom of the tank with a flange lid screwed to it. A sealing ring is
inserted between the flange lid and the flange. Thermowells for placing a heating element and sensors of
thermostat and safety fuse are located in the flange lid. Anode rod is mounted on M8 nut. Electric wiring is
placed underneath the plastic removable cover. The temperature of water and other comfort functions can
be set using the electronic thermostat E1. Description of basic parts of the heater –Figure 1. Heater
dimensions - Figure 2 and Table 2.
Figure 1
1
heating element well
2
ceramic heating element 2000W
3
electronic thermostat with external
control and safety fuse
4
electric installation cover-SMART
5
cold water supply pipe
6
thermowell
7
hot water withdrawal pipe
8
Magnesium anode
9
enamelled steel receptacle
10
CFC free polyurethane insulation
11
heater shell

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2OPERATION AND FITTING INSTRUCTIONS
2.1 OPERATING CONDITIONS
The tank shall only be used in accordance with the conditions specified on the performance
plate and in instructions for electric wiring. Besides legally acknowledged national
regulations and standards, also conditions for connection defined in local electric and water
works have to be adhered to, as well as the installation and operation manual. The room, in
which the appliance will be operated, must be frost-free. The appliance has to be mounted
at a convenient place, it means that the appliance must be easily available for potential
necessary maintenance, repair or replacement, as the case may be.
If water is strongly calcareous we recommend that any of the common decalcifying devices
was installed with the appliance, or the thermostat to be set to minimum operation
temperature of 60oC. For proper operation, drinkable water of adequate quality shall be
used. To avoid potential sediments we recommend that the device was installed together
with a water filter.
Figure 2
model
OKHE
80-
SMART
OKHE
100-
SMART
OKHE
125-
SMART
OKHE
160-
SMART
A [mm]
742
887
1052
1237
B [mm]
610
(560)
700
(650)
850
(800)
1050
(1000)
C [mm]
127
(177)
182
(232)
197
(247)
182
(232)
Max
weight
without
water
[kg]
37
42
49
57
Table 2

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2.2 WALL MOUNTING
Prior to the mounting, check the bearing capacity of the wall and the material it is made of,
considering the weight of the heater filled with water. Depending on the wall material,
choose adequate fixtures. Should you have any doubts regarding the wall bearing capacity,
consult the suspension with a building specialist. The minimum diameter of the bolts for
suspending the heater is 12 mm. When mounting the anchor bolts follow the guide
provided by the anchor bolts' manufacturer.
Mount the anchors by the dimensional drawing on Figure 3 in 350 mm spacing, and screw firmly a steel
hinge onto the wall. Check its proper vertical positioning. Double check the torque of the suspension bolts
on the heater and suspend the heater. If needed, the suspension bolts can be shifted by 50 mm in vertical
direction. Using the detent support in the bottom part of the heater make sure it runs in parallel with the
wall!
Figure 3
If the hot water heater is mounted in a tight, small space, or in an intermediate ceiling, etc.,
you have to make sure that the connecting side of the appliance (connections to water
supply, area for electric plugging) remained accessible and no heat accumulation occurs.
Free space of up to 500 mm from the bottom edge of the heater has to be available under
the heater. When mounted directly under the ceiling, the distance from the ceiling has to be
50 mm at least.
2.3 PLUMBING FIXTURE
Power water connects to pipes with 3/4“ thread in the bottom part of the heater. Blue - cold
water supply, red –hot water outlet. For potential disconnection of the heater, the service
water inlets and outlets must be provided with screw coupling Js 3/4“. Safety valve is
mounted on the cold water inlet identified with a blue ring.
Each hot service water pressure heater must have a safety valve with a membrane spring.
Nominal clearance of safety valves is defined in the ČSN 0 60830 standard. The heaters are
not equipped with a safety valve. The safety valve must be easily accessible, as close to the
heater as possible. The inlet pipes must have at least the same clearance as the safety valve.
Safety valves with fixed pressure settings from the manufacturer are used for the assembly.
Starting pressure of a safety valve must be identical with the maximum allowed heater
pressure, and at least 20% higher than the maximum pressure in the water main –see Table
3. If the water main pressure exceeds such value, a reduction valve must be added to the
system. No stop valves can be put between the heater and the safety valve. During the
assembly, follow the guide provided by the safety equipment manufacturer.

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Required pressures –Table 3. We recommend that the hot water distribution from the heater was as short
as possible to minimise heat losses.
Figure 4
Safety valve
starting
pressure [MPa]
Admissible
operating
over-pressure
of water
heater [MPa]
Maximum
pressure in
cold water
pipes [MPa]
0.6
0.6
up to 0.48
Table 3
Heaters must be provided with a discharge valve
mounted on the cold service water inlet to the
heater for potential disassembly or repair. When
assembling the security equipment, follow ČSN 06
0830.
2.4 ELECTRIC WIRING
2.4.1 ELECTRIC INSTALLATION GENERAL INFORMATION
In the electric wiring casing remove the partition corresponding with the input wire diameter of 8 or 10.
(Figure 5). The degree of protection of electric parts of the heater is IP 45. Power input of electric element
is 2000 W.
It is necessary to check the safety valve each time before putting it into operation. It is
checked by manual moving of the membrane from the seat, turning the make-and-break
device button always in the direction of the arrow. After being turned, the button must click
back into a notch. Proper function of the make-and-break device results in water draining
through the safety valve outlet pipe. In common operation, such a check needs to be
implemented at least once a month, and after each heater shutdown for more than 5 days.
Water can drip from the safety valve through the drain pipe; the pipe must be freely open to
the atmosphere, placed vertically and shall be in an environment free of temperatures below
freezing. When draining the heater, use a drain valve. You must first close the water supply
to the heater.

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Figure 5
It is necessary to observe the below requirements during the electric wiring.
Heater is connected to power supply 2 PEN AC 230V/50Hz via a fixed movable
wire/wires (depending on the connection method).
The circuit must contain a breaker disconnecting all poles of the network, and a
circuit breaker (protector).
Installations in bathrooms, lavatories and showers must comply with the ČSN33
2000-7-701 standard.
To adjust the distance from the wall, connect the wire of the external protective
bonding!
Respect the rules of protection against electrical injuries in accordance with ČSN 33
2000-4-41.
2.4.2 METHODS OF ELECTRONIC THERMOSTAT CONNECTION
A Permanent connection without HDO detection
This connection is convenient for households where the cheap and expensive supplied electricity tariff is
not distinguished. Recommended modes for this connection: NORMAL, SMART, ECO, PROG/ANTIFROST.
Figure 6 1-Printed conductor plate 2-Thermal fuse 3-Heating element

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Conductors:
L_LINE –Phase conductor, permanent voltage
N_LINE –Working conductor, permanent voltage
PE _LINE –protective conductor
Clamps:
LT –Phase conductor, thermal fuse
LH –Phase conductor, heating element
LF –Phase conductor, feeding of thermostat
LS –Phase conductor, HDO detector
NF –Permanent voltage working conductor
NS –Non connected
B Permanent connection with HDO detection
This connection is convenient for households with HDO –reduced electricity tariffs, where all modes
are functional - NORMAL, SMART, HDO, SMART HDO, ECO, PROG/ANTIFROST.
CAUTION! In this connection type the desired operating mode has to be selected
correctly. If you intend to heat water by means of HDO only (reduced electricity
tariff), you have to select between the HDO or SMART HDO modes (the expensive
tariff current in these modes is only provided by the supply control electronics,
and its consumption is minimal). If activated, other modes would use an
expensive electricity tariff. COSTS ON WATER HEATING WOULD THUS BE HIGHER!
The advantage of this connection is that the display shows all data except of the
time when the HDO current supply is off (reduced electricity tariff).
Figure 7 1-Printed conductor plate 2-Thermal fuse 3-Heating element
Conductors:
L_LINE –Phase conductor, permanent voltage
L_HDO –Phase conductor, HDO detector
N_LINE –Working conductor, permanent voltage
N_HDO –Working conductor, HDO
PE HDO –Protective conductor, HDO
PE LINE –Protective conductor, permanent voltage
Clamps:
LT –Phase conductor, thermal fuse
LH –Phase conductor, heating element
LF –Phase conductor, feeding of thermostat
LS –Phase conductor, HDO detector
NF –Permanent voltage working conductor
NS –Working conductor in this connection only serves as
an auxiliary clamp for connection of the working HDO
conductor

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C, HDO connection
This connection is convenient for households with HDO –reduced electricity tariffs, and the following
modes are functional: NORMAL (in this case same functionality as in the HDO mode), HDO, SMART, HDO,
ECO and PROG.
The display is active (backlit, the temperature inside the heater is displayed) only when
HDO is supplied. Beyond that time, the data on the display will who when pressing any
key. The display will show the information for 20 seconds and then switches off. At the
time the display backlit is inactive and so is the displaying of the temperature inside the
heater. In this connection, a jumper has to be connected between the clamps LF and LS
(Fig. 8), otherwise the heater will not work!
Figure 8 1-Printed conductor plate 2-Thermal fuse 3-Heating element 4 - Jumper
Conductors:
L HDO –Phase conductor switched by HDO signal
N HDO –Working conductor, HDO
PE HDO –Protective conductor
Clamps:
LT –Phase conductor, thermal fuse
LH –Phase conductor, heating element
LF –Phase conductor, feeding of
thermostat
LS –Phase conductor, HDO detector
NF –Permanent voltage working
conductor
NS –Non connected
Selection of the wiring type has to follow the contractual
conditions between the consumer and electricity supplier (the
power undertaking).

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2.5 FIRST HEATER COMMISSIONING
Before opening the power supply, the tank must be filled with water. The process of first
heating must be executed by licensed professional who has to check it. Both the hot water
outlet pipe and safety armature parts may be hot.
During the heating process the pressurised connection water that increases its volume due
to heating must drip off the safety valve. In non-pressurised connection water drips off the
overflow combination faucet. When heating is finished, the set temperature and the actual
temperature of consumed water should be roughly equal. After connecting the heater to the
water main and electrical power system, and after checking the safety valve (following the
instructions attached to the valve), the heater can be put into operation.
Procedure of putting the heater into operation:
1. Check the water main and wiring. Check proper placement of thermostat and safety fuse sensors.
Electronic thermostat contains two temperature sensors placed on the holder that defines their
exact position in the thermowell. The upper sensor is placed in a 430mm distance, and the lower in
a 120mm from the bottom edge of the thermowell. The accurate position of the sensor is
necessary to ensure proper function of the electronic thermostat, and is defined by the sensor
holder. The safety fuse sensor has to be inserted all the way in the thermowell.
2. Open the hot water valve on the combination faucet.
3. Open the cold water inlet valve to the heater.
4. As soon as the water starts running through the hot water valve, the heater is filled and the valve
can be closed.
5. In case of a leakage (flange lid), we recommend fastening the flange lid bolts.
6. Screw down the electric installation guard.
7. When hot service water heating by electric energy, switch on the power supply.
8. When commencing operation, flush the heater until the cloudiness in the water is gone.
9. Make sure to fill in properly the warranty certificate.

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2.6 PUTTING OUT OF SERVICE, DISCHARGE
If the hot water heater is put out of service for a longer time, or if it is not going to be used it
has to be drained and disconnected from the electric supply network on all poles. The switch
for the supply lead or the fuse cut-outs have to be shut off.
At places with permanent risk of frost the hot water heater must be drained before the cold
season starts if the appliance remains out of service for several days and if the power supply
is disconnected. Alternatively, an antifreeze protection can be activated (refer to the
PROG/ANTIFROST function).
Drainage of service water shall be performed after closing the shut-off valve in the cold
water supply piping (through the discharge valve for safety valve combination), and with
simultaneous opening of all hot water valves of connected fittings. Hot water may outflow
during the drainage! If there is a risk of frost it has to be considered that not only the water
in the hot water heater and in the hot water piping may get frozen but also the water in the
entire cold water supply piping. It is therefore advisable to drain all fittings and piping that
carry water, up to the part where the house water meter is installed (connection of the
house to water main) which is not jeopardised by frost. When the tank is to be used again, it
has to be filled with water and one needs to make sure that the water flowing out at the hot
water valves did not contain any bubbles.
2.7 INSPECTION, MAINTENANCE & CARE FOR THE APPLIANCE
During the heating process the water that increases its volume during the heating must drip
off the safety valve outlet (in non-pressurised connection this water drips off the
combination faucet valve). In full heating (about 65oC) the volumetric water gain is approx.
3% of the tank capacity. The function of the safety valve has to be checked regularly (based
on the information contained in the attached safety valve manual). In common operation,
such a check needs to be implemented at least once a month, and after each heater
shutdown that exceeds 5 days.
Caution! In doing so, the cold water supply pipe and the connection fitting of the tank may
get heated! If the hot water heater does not work, or if hot water is not withdrawn, no
water shall drip off the safety valve. If water drips, then the pressure in the supply piping is
either too high, or the safety valve is defective. Please call a specialised plumber
immediately!
If water contains too many minerals, an expert has to come to remove the scale that forms
inside the tank, as well as free sediments. This has to be performed after one or two years of
operation. The cleaning is carried out through the hole in the flange by: draining the boiler,
dismantling the flange lid and cleaning the tank. A new sealing has to be used for re-fitting.
Since the inside of the heater has special enamel, the surface of which must not get in
contact with a scale removing agent –do not work with a lime pump. Remove the lime layer
with a timber and suck it off, or wipe it off with a clout. After that, the appliance must be
rinsed thoroughly and the heating process is checked the same as during the initial putting in
operation. Do not use any abrasive cleaning agents or dye thinners to clean the outer shell of
the heater (such as cellulose thinner, trichlor, and the like). For cleaning use a wet clout and
add a few drops of liquid cleaning agent for household applications.

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2.8 MOST FREQUENT FUNCTION FAILURES AND THEIR CAUSES
The thermostat is equipped with auto-diagnostics that allows display of some failure modes.
If a failure occurs, the failure symbol shows on the display and the failure code can be looked up in the
menu (Table 4).
Failure code
Err_
Err1
Err2
Err3
Failure description
no failure
bottom sensor failure
upper sensor failure
both sensors failed
Table 4
If one of the temperature sensors fails (Err1 or Err2), the boiler runs in NORMAL mode only (allows
emergency run of the heater), if both sensors fail (Err3), the heating element does not heat.
Other potential failures –Table 5.
Failure symptom
Potential failure cause
Solution
Water is cold
Low temperature is set on the
thermostat (applies to modes
NORMAL, HDO, ECO).
Heating element failure
The thermal fuse is activated
(relevant symbol lights on the
display).
Set higher temperature on
the thermostat.
Seek an authorised service
centre.
Seek an authorised service
centre.
Water is constantly
dripping off the safety
valve
high input pressure
defective safety valve
Use pressure control valve
Replace the valve
Table 5
Do not try to repair the failure yourselves. Seek either expert or service help. It does not take
much for an expert to remove the defect. When making a repair appointment, report the
type and serial number you find on the performance plate of your water heater.
3. OPERATION OF THERMOSTAT
Electronic thermostat for controlling electrical water heaters of DZ Dražice allows multiple operating modes
along with providing comfort functions. The thermostat contains a display and a five-key keyboard that
allows setting of the heater.

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3.1 OPERATING MODES
3.1.1 NORMAL
Mode in which the controller keeps the heater at constant, user defined temperature in the range between
5 to 65°C. A standard thermostat function –keeps the heater constantly warmed up to the set
temperature, same as the existing capillary thermostats.
3.1.2 HDO
The controller keeps the heater at constant, user defined temperature in the range between 5 až 65°C only
when low electricity tariff is detected.
3.1.3 ECO
Same function as in the NORMAL mode, just the maximum reachable temperature is limited to 55°C.
3.1.4 SMART
In this mode the controller passes through two phases in order to save at least 10% of electric power,
comparing to the NORMAL mode. In the first phase (learning mode –only the SMART + NORMAL symbols
are shown on the display) constant temperature of the heater is maintained in one calendar week, and the
control electronics monitors the user's behaviour in terms of water consumption. This information is
recorded and subsequently processed. In the second phase (which starts the following calendar week) the
controller applies the information obtained in the first phase and prepares only such amount of water that
user consumes in relevant time, leaving a certain reserve for case of unexpected water withdrawal. In this
phase water consumption data are collected and evaluated. The obtained information is applied in such
manner to adapt continuously to user's requirements. During this mode, minimum temperature is
maintained automatically at 45°C.
If, during the learning mode (the first 7 days) electricity dropout occurs, the learned data on
hot water consumption will be lost. After electricity re-connection the learning mode is
restarted and new data collected for another 7 days. When this period elapses, the collected
data are kept in the appliance memory and potential electricity dropout will not cause loss
of them.
3.1.5 SMART HDO
The boiler operates in HDO mode but if it detects that the heated water was not used in a day, the
following day it will reduce the temperature automatically. On the contrary, if all the warmed water was
consumed, it increases the temperature and this process is repeated until the heat accumulated in the
heater equals the consumption.
3.1.6 PROG/ANTIFROST
The mode of putting the heater out of operation (holiday programme). Makes sure that the temperature of
water in the heater does not drop below 5°C (electricity supply is necessary).
3.1.7 STOP
Function for switching off the heater. In this mode, the heating element cannot be switched on. Also the
ANTIFROST function is eliminated.

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In addition, in all modes (except STOP) the minimum temperature of 5°C is maintained (if the
temperature drops below this value, the heating element activates. Electricity supply is the
only requirement.
3.2 DISPLAY
The display contains the below listed data (Figure 9):
1. numerical (when setting, the numerical area flashes in second intervals);
2. specifying displayed number / units (temperature, consumed energy in kilowatt-hours, amount of
water available after mixing to 40°C, time and date);
3. displaying selected thermostat mode (NORMAL, SMART, SMART HDO, HDO, ECO and PROG);
4. bar-graph showing the amount of available water after mixing to 40°C (100% = full boiler of water
warmed up to 65°C);
5. status report icons:
oSnowflake symbol –emergency heating using the function –the temperature of the boiler
was below +5°C and water distrubution pipes might get damaged;
oFuse symbol –mechanical thermal fuse was activated;
oHeating symbol - heating element activity;
oErr symbol–failure; the error code is shown on the display.
Figure 9

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The options of display images are described in Table 6.
Data displayed
Description
Current and set
temperature in
boiler
In idle mode, the display does not show current temperature in the boiler, or this
imaging can be achieved with arrows UP / DOWN (symbol °C). If network voltage is
not available, dashes are displayed.
Amount of
available water
mixed to 40°C
Using the UP / DOWN arrows, approximate amount of available water after mixing to
40°C can be displayed after hitting the litre symbol. If no power supply is available, or
it the water temperature in the heater is below 40°C, zero amount shows.
As result of higher single hot water withdrawal a zero amount can be displayed (even
BARGRAPH will not show on the display), despite water warmer than 40°C will flow
out of the heater. This is caused by complex dynamic phenomena that develop when
the boiler is filled with new cold water. Once water stabilises and distributes,
numerical data will be displayed again.
Heating element
activity indication
The symbol on the display indicates activity of the heating element.
Energy
consumption with
resetting option
Using the UP / DOWN arrows approximate amount of consumed electricity after
hitting the kWh symbol can be displayed - the electronics from the element output
and the time of its run counts with the energy consumed from the last reset.
Clock and date
The thermostat contains backed up actual time clock.
“ANTIFROST“
If the boiler is switched off, this function prevents temperature drop below +5°C. If
heating takes place despite that, the snowflake symbol shows on the display if the
temperature drops below +5°C and the ANTIFROST function activates.
Thermal fuse
opening indication
If the mechanical thermal fuse opens, the fuse symbol shows on the display.
Table 6
3.3 CONTROL
The thermostat can be controlled by means of the UP, DOWN, RIGHT, LEFT and OK keys.
Short press is a press shorter than 3 seconds.
Long press is a press longer than 3 seconds.
Simultaneous press is a press of two keys at once that lasts longer than 3 seconds.
3.3.1 THERMOSTAT MODE SETTING
Setting the mode is possible after simultaneous pressing the RIGHT and LEFT keys longer than 3 seconds
(protection against unintended mode switching). Once the set mode symbol starts flashing, you can use the
RIGHT or LEFT keys to switch between the modes.
NORMAL
SMART (If SMART is selected the first week of “learning”, both the NORMAL and SMART symbols
are active on the display and later also the SMART symbol);

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SMART HDO (the SMART and HDO symbols are active on the display).
HDO
ECO
PROG/ANTIFROST
Confirm the selected mode by short pressing OK. If no confirmation by pressing the OK key comes within
thirty seconds from the last pressing of any of the arrows, the newly set mode does not save and the
thermostat returns to normal mode.
STOP mode
oSwitching the boiler off to emergency mode when the heating element cannot switch. The
STOP mode activates by simultaneous pressing the UP and DOWN keys for over 3 seconds.
The “STOP” sign appears on the display. It switches off in the same way.
3.3.2 STANDARD DISPLAY MODE
In this mode, the UP / DOWN arrow keys can be used to switch cyclically in the display mode.
1. current temperature of water in the boiler
2. electricity consumption from the last reset of the counter
3. amount of available water after mixing to 40°C
4. current time
5. current date
6. current year
7. current day of the week (d 1 –d 7)
8. failure (error) code.
The display also shows the amount of available water and icons on the bar-graph: Antifrost activation,
activation of mechanical thermal fuse, activity of heating element and general error report Err (the error
code shows on the display). If no constant power supply is available, the display goes off in 20 seconds
following the power outage. When any key is pressed, it will light up again for 20 seconds.
3.3.3 SETTING MODE
Enter the setting mode by long pressing the OK key.
3.3.3.1 Setting the desired temperature (for modes NORMAL, SMART HDO, HDO &ECO)
Using the UP or DOWN arrows select temperature display (symbol "°C“) and press long the OK key until the
information on the set temperature starts flashing. Using the UP or DOWN keys set the desired
temperature and confirm with short pressing of OK. If no confirmation by pressing the OK key comes within
thirty seconds from the last pressing of any of the arrows, the new temperature does not save and the
thermostat returns to normal mode.
3.3.3.2 Resetting the electricity consumption meter
Using the UP or DOWN arrows select the mode of displaying the electricity consumption (symbol "kWh“)
and long press the OK key until the information on electricity consumption starts flashing. Use the DOWN
key to reset the measured value and confirm by short OK pressing. If no confirmation by pressing the OK
key comes within thirty seconds from the last pressing of any of the arrows, the reset is of no effect and the
thermostat returns to normal mode.
3.3.3.3 Time setting
Using the UP or DOWN arrows select the current time display mode (symbol "time“) and long press the OK
key until the time starts flashing. Using the UP or DOWN keys set the desired time and confirm with short
pressing of OK. Minutes will start flashing; using the UP or DOWN keys set the desired minutes and confirm

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with short pressing of OK. If no confirmation by pressing the OK key comes within thirty seconds from the
last pressing of any of the arrows, the newly set time does not save and the thermostat returns to normal
mode.
3.3.3.4 Date setting
Using the UP or DOWN arrows select the current date display mode (symbol "date“) and long press the OK
key until the first double figure indicating the day starts flashing. Using the UP or DOWN keys set the
desired day and confirm with short pressing of OK. The second double figure will start flashing; using the UP
or DOWN keys set the desired month and confirm with short pressing of OK. If no confirmation by pressing
the OK key comes within thirty seconds from the last pressing of any of the arrows, the newly set date does
not save and the thermostat returns to normal mode.
3.3.3.5 Year setting
Using the UP or DOWN arrows select current year display (symbol "date“) and long press the OK key until
the information on the set year starts flashing. Using the UP or DOWN keys set the desired year and
confirm with short pressing of OK. If no confirmation by pressing the OK key comes within thirty seconds
from the last pressing of any of the arrows, the newly set year does not save and the thermostat returns to
normal mode.
3.3.3.6 Setting a day in week
Using the UP or DOWN arrows select current year display (symbol "date“, sign D1 to D7 on the display) and
long press the OK key until the information on the set day starts flashing. Using the UP or DOWN keys set
the current day (D1 = Monday, (D2 = Tuesday), and confirm with short pressing of OK. If no confirmation by
pressing the OK key comes within thirty seconds from the last pressing of any of the arrows, the newly set
day does not save and the thermostat returns to normal mode.