Drazice OKC 80 Specification sheet

OPERATION AND
INSTALLATION MANUAL
TANK-TYPE WATER HEATERS
FOR VERTICAL MOUNTING
4 kW/400 V
Combined Electric
OKC 80 OKCE 80
OKC 100 OKC 100/1m2 OKCE 100
OKC 125 OKC 125/1m2 OKCE 125
OKC 160 OKC 160/1m2 OKCE 160
OKC 180 OKC 180/1m2 OKCE 180
OKC 200 OKC 200/1m2 OKCE 200
Družstevní závody Dražice - strojírna s.r.o.
Dražice 69, 294 71 Benátky nad Jizerou
tel.: +420 / 326 370 990
fax: +420 / 326 370 980
e-mail: [email protected]

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CONTENTS
1TECHNICAL SPECIFICATION OF PRODUCT.................................................................................................4
1.1 FUNCTION DESCRIPTION ..................................................................................................................4
1.2 ADVICE FOR CUSTOMERS .................................................................................................................5
1.2.1 HOT WATER CONSUMPTION ....................................................................................................5
1.2.2 ENERGY SAVING........................................................................................................................5
1.2.3 EMERGENCY POWER CONSUMPTION.......................................................................................5
1.3 DESIGN AND GENERAL HEATER DIMENSIONS ..................................................................................6
2OPERATION AND FITTING INSTRUCTIONS ..............................................................................................11
2.1 OPERATING CONDITIONS ...............................................................................................................11
2.2 WALL MOUNTING...........................................................................................................................11
2.3 PLUMBING FIXTURE........................................................................................................................12
2.4 ELECTRIC WIRING ...........................................................................................................................14
2.4.1 ELECTRIC INSTALLATION GENERAL INFORMATION.................................................................14
2.5 CONNECTION OF INDIRECT HEATER TO HOT WATER HEATING SYSTEM ........................................15
2.6 FIRST HEATER COMMISSIONING ....................................................................................................16
2.7 PUTTING OUT OF SERVICE, DISCHARGE..........................................................................................16
2.8 INSPECTION, MAINTENANCE & CARE FOR THE APPLIANCE ............................................................17
2.9 MOST FREQUENT FUNCTION FAILURES AND THEIR CAUSES ..........................................................18
3. OPERATION OF THERMOSTAT ................................................................................................................19
3.1 OPERATING MODES........................................................................................................................19
3.1.1 SERVICING...............................................................................................................................19
3.1.2 TEMPEATURE SETTING ...........................................................................................................19
3.1.3 LIMITING THE REGULATION RANGE; LOCKED SETTINGS.........................................................20
4 IMPORTANT NOTICES .............................................................................................................................20
4.1 INSTALLATION REGULATIONS.........................................................................................................20
4.2 DISPOSAL OF PACKAGING MATERIAL AND FUNCTIONLESS PRODUCT............................................21
3 PRODUCT ACCESSORIES .........................................................................................................................21

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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.

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1TECHNICAL SPECIFICATION OF PRODUCT
1.1 FUNCTION DESCRIPTION
The heater is designed for accumulation heating of service water using electricity or thermal energy via an
exchanger (for the combined design only). Water is heated by an electric element (or a heat exchanger) in
an enamelled thermally insulated accumulator at the time defined by the power supplier. The element is at
the time of heating controlled by a thermostat the temperature of which can be adjusted continuously
(within the range between 5°C and 74°C). Once the selected temperature is reached, heating interrupts
automatically. Water accumulated in the tank is then used for 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 water flowing in remains in the bottom part of the heater. Pressure principle
allows hot water withdrawal at any place from the heater.
a) Water heating by electric energy
After the heater is connected to electric network, the heating element starts heating water. The element is
turned on and off by a thermostat. After reaching the temperature set, the thermostat switches off the
electric circuit and thus discontinues water heating. The control light signals if the element is in operation
(light is on) or if it is off (the light goes out). In case of longer operation without using the heated volume,
the thermostat has to be set to position 5°C to 8°C (set the “snowflake” symbol on the thermostat selector)
to avoid its freezing, or electricity supply to the heater has to be switched off. In combined versions, the
stop valve on the inlet to the exchanger has to be closed, which prevents heating water in the hot water
heating system.
b) Service water heating via thermal energy through heat exchanger
Closing valves of the heat exchanger must be opened which ensures heating water flow from the hot water
heating system. Together with a closing valve, it is recommended to install an air outlet valve at the inlet to
the heat exchanger in order to bleed the heat exchanger as needed, in particular before the beginning of
the heating season. The time of heating using the heat exchanger depends on the temperature and flow of
water in the hot water heating system. A combined heater is made in universal design –depending on the
need of connecting the closing valves to the heating element either from the right, or from the left.

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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.
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.

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Data Sheet pursuant to Directive No - see Table 1.
HEATER TYPES
ENERGY
EFFICIENC
Y CLASS
HEAT
LOSSES
(kWh/
24hr/l)
NOMINA
L
CAPACIT
Y (l)
TIME OF
CONTEN
T
HEATING
(hours)
ELECTRICITY
CONSUMPTIO
N FOR
HEATING OF
THE
CONTENTS
FROM 15°C TO
65°C (kWh)
HEAT
LOSSES
(kWh/
24h)
OKC 80
75
1.1
4.8
OKC 100; OKC
100/1m2
95
1.5
6
OKC 125; OKC
125/1m2
120
2
8
OKC 160; OKC
160/1m2
147
2.4
9.6
OKC 180; OKC
180/1m2
175
2.7
10.6
OKC 200; OKC
200/1m2
195
3
12
OKCE 80
80
1.1
4.8
OKCE 100
100
1.5
6
OKCE 125
125
2
8
OKCE 160
152
2.4
9.5
OKCE 180
180
2.7
10.6
OKCE 200
200
3
12
Table 1
1.3 DESIGN AND GENERAL HEATER DIMENSIONS
The heater receptacle is made of a steel plate and tested by 0.9 MPa overpressure. The inside of the
receptacle is enamelled. A flange is welded onto the lower bottom of the receptacle with a flange lid
screwed onto it. A sealing ring is inserted between the flange lid and the flange. Thermo wells for
thermostat sensors and thermometer installation are placed in the flange lid. Anode rod is mounted on M8
nut. The water reservoir is insulated by means of polyurethane foam. Electric wiring is placed underneath

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the plastic removable cover. The temperature of water can be set using the thermostat. Heat exchanger(s)
is/are welded onto the pressure tank.
Description of basic parts of the heater –Figure 1, Figure 2. Heater dimensions –(Figure 1, Figure 2) and
(Table 3, Table 4)
TYPE
OKC 80
OKC 100
OKC 125
OKC 160
OKC 180
OKC 200
OKC
100/1m2
OKC
125/1m2
OKC
160/1m2
OKC
180/1m2
OKC
200/1m2
OKCE
80
OKCE
100
OKCE
125
OKCE
160
OKCE
180
OKCE
200
CAPACITY K / E
l
75/80
95/100
120/125
147/152
175/180
195/200
MAX. OPERATING
OVERPRESSURE IN THE
TANK
MPa
0.6
MAXIMUM OPERATING
OVERPRESSURE IN THE
EXCHANGER*
MPa
1
ELECTRIC CONNECTION
3 PE-N 400V/50Hz
POWER INPUT
W
4000
EL. PROTECTION
IP 45
MAX TEMPERATURE OF
HSW
°C
80
RECOMMENDED HSW
TEMPERATURE
°C
60
HEIGHT OF THE HEATER
mm
736
881
1046
1235
1187
1287
DIAMETER OF THE
HEATER
mm
524
524
524
524
584
584
MAX WEIGHT OF THE
HEATER WITHOUT
WATER
kg
42/36
52/58/
42
58/64/
48
66/72/
58
76/82/
72
81/88/
76
TIME OF EL. HEATING
FROM 10°C TO 60°C
hod
1.1
1.5
2
2.4
2.7
3
HEAT LOSSES/EN. CLASS
kWh/24h

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* The OKCE series heaters do not have a heat exchanger.
Table 2
TYPE
OKC 80
OKC 100
OKC 125
OKC 160
OKC 180
OKC 200
EXCHANGER HEAT
SURFACE
m2
0.41
0.68
0.68
0.68
0.68
0.68
RATED THERMAL
OUTPUT AT HEATING
WATER TEMPERATURE
OF 80°C AND FLOW 720
l/h
W
9000
17000
17000
17000
17000
17000
TIME OF HEATING BY
EXCHANGER FROM 10°C
TO 60°C
min
32
23
28
35
40
45
RATED THERMAL
OUTPUT AT HEATING
WATER TEMPERATURE
OF 80°C AND FLOW 310
l/h
W
7000
9000
9000
9000
9000
9000
TIME OF HEATING BY
EXCHANGER FROM 10°C
TO 60°C
min
50
48
55
75
77
86
TYPE
OKC
100/1m2
OKC
125/1m2
OKC
160/1m2
OKC
180/1m2
OKC
200/1m2
EXCHANGER HEAT
SURFACE
m2
-
1.08
1.08
1.08
1.08
1.08
RATED THERMAL
SURFACE AT HEATING
WATER TEMPERATURE
OF 80°C AND FLOW 720
l/h
W
-
24000
24000
24000
24000
24000
TIME OF HEATING BY
EXCHANGER FROM 10°C
TO 60°C
min
-
14
17
23
26
28

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OKC 80, OKC 100, OKC 125, OKC 160, OKC 180, OKC 200,
OKC 100/1m2, OKC 125/1m2, OKC 160/1m2, OKC 180/1m2, OKC 200/1m2
Table 3
TYPE
OKC 80
OKC 100
OKC 125
OKC 160
OKC 180
OKC 200
OKC 100/1m2
OKC 125/1m2
OKC 160/1m2
OKC 180/1m2
OKC 200/1m2
A
736
881
1046
1235
1187
1287
B*
731
876
1041
1230
1182
1282
C
615
765/636
765/801
1005
793
793
D
524
524
524
524
584
584
E
501
651/701
651/701
651/701
685
685
F
-
- / 551
- / 551
- / 831
- / 895
- / 895
G
G3/4"
G3/4" / G1"
G3/4" / G1"
G3/4" / G1"
G3/4" / G1"
G3/4" / G1"
H
-
- / G3/4"
- / G3/4"
- / G3/4"
- / G3/4"
- / G3/4"
I
211
211
211 / 261
211/261
245
245
J
-
-
-
720/815
600
600
*Distance from the upper heater's edge to the end of the water inlet and outlet tubes. Check the B and N
dimensions before drilling. The values behind the slash apply to heaters with a 1.08 m2 exchanger.
Upper and lower hinge 160,180,
200L 4 anchor bolts
Dimensions 450mm and E Check
before drilling
Upper hinge and support
80-125L 2 anchor bolts
Figure 1

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Figure 2
TYP
OKCE 80
OKCE
100
OKCE
125
OKCE 160
OKCE 180
OKCE
200
A
736
881
1046
1235
1187
1287
B*
731
876
1041
1230
1182
1282
C
615
765
765
1005
793
793
D
524
524
524
524
584
584
E
-
-
-
720
600
600
*Distance from the upper heater's edge to the end of the water inlet and outlet
tubes.
Table 4
Upper and lower hinge
160,180, 200L
4 anchor bolts
Dimensions 450mm and E
Check before drilling
Upper hinge and
support
80-125L
2 anchor bolts

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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.
We would like to emphasise that the heater must not be connected to power supply if
work involving flammable liquids (petrol, spot remover) or gases, etc., is performed
nearby.
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.
2.2 WALL MOUNTING
Prior to mounting, check the loading capacity of the wall and, depending on the type of
masonry, choose a suitable anchorage material, or reinforce the wall, if needed. The water
heater shall only be mounted in vertical position so that the lower side of the heater was
placed at least 600 mm above the floor (Figure 3). In combined heaters, elbows have to be
attached to the heating water inlet and outlet and, by turning them, the mounting either
from the right or from the left has to be determined. With regard to various types of carrying
masonry and broad assortment of special anchorage material available at the market, we do
not provide heaters with this material. The anchorage system has to be selected
individually, depending on the conditions. We recommend an authorised company perform
mounting on the wall and anchorage, or discuss the anchorage with a professional.
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 600 mm from the bottom edge of the heater has to be available under
the heater.

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Figure 3
2.3 PLUMBING FIXTURE
Connection of heaters to plumbing fixtures is illustrated on Figure 4. 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 membrane spring loaded with a safety
valve. Nominal clearance of safety valves is defined in the standards. The heaters are not
equipped with a safety valve. The safety valve must be easily accessible, as close to the
heater as possible. The input pipes must have at least the same clearance as the safety valve.
The safety valve is placed high enough to secure dripping water drain by gravity. We
recommend mounting the safety valve onto a branch pipe. This allows easier exchange
without having to drain the water from the heater. Safety valves with fixed pressure settings
from the manufacturer are used for the assembly. Starting pressure of a safety valve must be
identical to the maximum allowed heater pressure, and at least 20% higher than the
maximum pressure in the water main (Table 5). If the water main pressure exceeds such
value, a reduction valve must be added to the system. No stop valves can be put between

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We recommend that the hot water distribution from the heater was as short as possible to
minimise heat losses.
Required pressures:
Table 5
the heater and the safety valve. During the assembly, follow the guide provided by the safety
equipment manufacturer.
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 to the right. 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 may be
dripping off the drain pipe of the safety valve; the pipe must be open into the air, pointed
down; environment temperatures must not drop below zero. When draining the heater, use
a recommended drain valve. First, close water input into the heater. Find necessary pressure
values in the following table. For proper safety valve operation, a backflow valve must be
mounted on the inlet pipes, preventing spontaneous heater draining and hot water
penetrating back into the water main. We recommend that the hot water distribution from
the heater was as short as possible to minimise heat losses.
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
0.7
0.7
up to 0.56
1
1
up to 0.8

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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 Standards.
Figure 4
2.4 ELECTRIC WIRING
2.4.1 ELECTRIC INSTALLATION GENERAL INFORMATION
The electric wiring scheme is attached to the water heater on the side of the electric
installation guard (see also Figure 5).
Connection, repairs, and wiring inspections may only be implemented by a company
(person) authorised to such activity.
Expert connection must be confirmed on the warranty certificate.
The heater is connected to the 400 V/50 Hz electric network using a fixed moving
conductor with a switch that turns off all network poles and the circuit breaker
(protector).
The degree of protection of electric parts of the heater is IP 45.
Respect the rules of protection against electrical injuries in accordance with
Standards.
0 - Air outlet valve
U –Shut-off valve
P1 - Safety valve with backflow flap
P2 - Safety valve for heating circuit
M - Manometer
Z –Test valve
V - Drain valve

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Figure 5
2.5 CONNECTION OF INDIRECT HEATER TO HOT WATER HEATING
SYSTEM
It is recommended to install stop valves on the heating water inlet and outlet (for
possible dismantling of the heater). The valves have to be as close to the heater as
possible to avoid higher thermal losses (Figure 6).
Figure 6

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2.6 FIRST HEATER COMMISSIONING
After connecting the heater to the water supply, the hot water heating system, the
electric network, and after testing its safety valve (based on the valve manual attached),
the heater may be put into operation. 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 both water and electric installation; for combined heaters, check the installation to a hot
water heating system. Check proper placement of operating and safety thermostat sensors. The
sensors must be inserted all the way in; first the operating and then the safety thermostat.
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. Fasten the electric installation cover.
7. In case of service water heating by electric energy, turn on the electricity (for combined heaters,
the heating water valve at the heating water entry to heating insert must be closed).
8. When heating service water with electric energy from the hot water heating system, turn the
electricity off and open the valves of heating water input and output, possibly de-aerate the
exchanger.
9. When commencing operation, flush the heater until the cloudiness in the water is gone.
10. Make sure to fill in properly the warranty certificate.
2.7 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.

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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.
2.8 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. Repetitive water heating causes limestone
sediment on both the tank walls and chiefly the flange lid. The sedimentation depends on
the hardness of water heated, its temperature, and amount of hot water consumed.
We recommend checking and cleaning the tank from scale and eventual replacement of
the anode rod after two years of operation. The anode life is theoretically calculated for two
years of operation; however, it changes with water hardness and chemical composition in
the place of use. Based on such an inspection, the next term of anode rod exchange may be
determined. Have the company in charge of service affairs clean and exchange the anode.
When discharging water from the heater, the combination faucet valve for hot water must
be open in order to avoid creating under pressure that would prevent water discharge. 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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2.9 MOST FREQUENT FUNCTION FAILURES AND THEIR CAUSES
Potential failures –Table 6
FAILURE SYMPTOM
LED
SOLUTION
Water is cold
LED is on
the temperature set on the
thermostat is too low
heating element failure
Water is cold
LED is not on
no supply voltage
thermostat failure
safety thermostat shut off
probably due to failed
operation thermostat
Water is not warm
enough
LED is on
failure of one of the coils in
the element (contains 2)
Temperature of water is
not corresponding
defective thermostat
Water is constantly
dripping of the safety
valve
LED is not on
input pressure too high
faulty safety valve
Table 6
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.

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3. OPERATION OF THERMOSTAT
3.1 OPERATING MODES
3.1.1 SERVICING
Service devices of heaters of 80 to 200 l capacity are located under the transparent guard of the control
panel. (Figure 7).
Thermostat knob Electric circuit closing indicator lamp Tipping plastic guard
Figure 7
3.1.2 TEMPEATURE SETTING
Water temperature is set by turning the thermostat knob. The desired symbol is adjusted against the fixed
point on the control panel - Figure 8.
Figure 8
Adjusting the thermostat selector at the left backstop does not mean permanent shutoff of
the heating element. When the heater is in use without blocking the daily rate, we do not
recommend the temperature to be set above 65°C. The maximum value to select is “60“.
Lower temperature range
limit (about 5°C)
Fixed point on the control
panel
“Anti-freezing” temperature
(about 8°C)
“Anti-freezing” temperature
(about 8°C)
Upper temperature range
limit (about 74°C)
”Ideal” temperature
(about 60°C)
”Ideal” temperature
(about 60°C)

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3.1.3 LIMITING THE REGULATION RANGE; LOCKED SETTINGS
For various safety reasons (unintentional scalding, preventing children or unauthorised person from
handling), the regulation range can be limited, or the setting on the thermostat blocked (Figure 9).
Figure 9
To limit regulation
-off the thermostat knob (it will be tough at first) and you will find two cylindrical pins Ø2,15mm on
the back side of the knob,
-pull off one pin and insert it to the corresponding hole of the selected maximum temperature,
-put the knob back on (to the stop).
To block the setting
-set the selected temperature pull off the thermostat knob without changing the setting, there are
two pins on the back side of the knob,
-pull off both of them and fit them to the holes corresponding with the selected temperature so that
the gap between the pins was without a hole, and the position was opposite the set temperature.
4 IMPORTANT NOTICES
4.1 INSTALLATION REGULATIONS
Without a confirmation of performed electrical installation issued by an authorised company, the
warranty certificate shall be void.
Check and exchange the Mg anode regularly.
You have to apply for approval of a local power supplier to connect the heater.
No stop valves can be put between the heater and the safety valve.
If the overpressure in the water main exceeds 0.6 MPa, a pressure control valve must be mounted
before the safety valve.
All hot water outputs must have a combination faucet.
Before filling the heater with water for the first time, it is recommended to fasten the flange
connection nuts of the tank.
It is not allowed to handle the thermostat, aside from temperature resetting with a control button.
To block the setting
Regulation limited