Drazice OKC 80 Specification sheet

OPERATION AND
INSTALLATION MANUAL
TANK-TYPE WATER HEATERS FOR VERTICAL
MOUNTING
Kombinované Elektrické
OKC 80 OKCE 50
OKC 100 OKC 100/1 m2 OKCE 80
OKC 125 OKC 125/1 m2OKCE 100
OKC 160 OKC 160/1 m2 OKCE 125
OKC 180 OKC 180/1 m2OKCE 160
OKC 200 OKC 200/1 m2OKCE 180
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]

- 2 -
CONTENTS
1TECHNICAL SPECIFICATION OF PRODUCT .................................................................................................4
1.1 FUNCTION DESCRIPTION ................................................................................................................... 4
1.2 ADVICE FOR CUSTOMERS .................................................................................................................. 4
1.2.1 HOT WATER CONSUMPTION ..................................................................................................... 4
1.2.2 ENERGY SAVING......................................................................................................................... 4
1.2.3 EMERGENCY POWER CONSUMPTION ....................................................................................... 5
1.3 DESIGN AND GENERAL HEATER DIMENSIONS................................................................................... 6
2OPERATION AND FITTING INSTRUCTIONS............................................................................................... 10
2.1 OPERATING CONDITIONS ................................................................................................................ 10
2.2 WALL MOUNTING............................................................................................................................ 10
2.3 PLUMBING FIXTURE......................................................................................................................... 11
2.4 ELECTRIC WIRING ............................................................................................................................ 12
2.4.1 ELECTRIC INSTALLATION GENERAL INFORMATION.................................................................12
2.5 CONNECTION OF INDIRECT HEATER TO HOT WATER HEATING SYSTEM ........................................ 13
2.6 FIRST HEATER COMMISSIONING ..................................................................................................... 14
2.7 PUTTING OUT OF SERVICE, DISCHARGE .......................................................................................... 15
2.8 INSPECTION, MAINTENANCE & CARE FOR THE APPLIANCE............................................................ 16
2.9 MOST FREQUENT FUNCTION FAILURES AND THEIR CAUSES .......................................................... 17
3OPERATION OF THERMOSTAT................................................................................................................. 17
3.1 OPERATING MODES......................................................................................................................... 17
3.1.1 SERVICING................................................................................................................................ 17
3.1.2 TEMPEATURE SETTING ............................................................................................................ 18
3.1.3 LIMITING THE REGULATION RANGE; LOCKED SETTINGS......................................................... 18
4IMPORTANT NOTICES .............................................................................................................................. 19
4.1 INSTALLATION REGULATIONS.......................................................................................................... 19
4.2 DISPOSAL OF PACKAGING MATERIAL AND FUNCTIONLESS PRODUCT ................................................. 20
5 PRODUCT ACCESSORIES .......................................................................................................................... 20

- 3 -
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.

- 4 -
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 (Figure 6).
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
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.
Hot utility water reservoir is insulated by means of a first-class polyurethane foam with zero
Freon content. 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 heat exchanger.

- 5 -
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 -
see Table 1.
HEAT TYPES
ENERGY
EFFICIENCY
CLASS
HEAT
LOSSES
Wh/24 hr/l
NOMINAL
CAPACITY
(l)
TIME OF
CONTENT
HEATING
(hours)
ELECTRICITY
CONSUMPTION
FOR HEATING
OF THE
CONTENTS
FROM 15°C TO
65°C IN kWh
HEAT
LOSSES
kWh/24 hr
OKC 80
75
2.5
4.8
OKC 100; OKC
100/1 m295 36
OKC 125; OKC
125/1 m2120 3.8 8
OKC 160; OKC
160/1 m2147 5 9.6
OKC 180; OKC
180/1 m2175 5 10.6
OKC 200; OKC
200/1 m2195 5.5 12
OKCE 50
51
1.5
3
OKCE 80
80
2.5
4.8
OKCE 100
100
3
6
OKCE 125
125
3.8
8
OKCE 160
152
5
9.5
OKCE 180
180
5
10.6
OKCE 200
200
5.5
12
Table 1

- 6 -
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 receptacle 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
regulation thermostat and safety fuse are located 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 the
plastic removable cover. The temperature of water can be set using the thermostat. In combined versions,
a heat exchanger is welded in the pressure tank. The heat exchanger is only intended for the heating
circuit.

- 7 -
Technical description: 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(Figure 1, Table 2, Table 4)
Figure 1
Table 2
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

- 8 -
Technical description: OKCE 50, OKCE 80, OKCE 100, OKCE 125, OKCE 160, OKCE 180, OKCE 200 (Figure
3, Table 3, Table 4)
Figure 2
TYPE
OKCE 50
OKCE 80
OKCE 100
OKCE 125
OKCE 160
OKCE 180
OKCE 200
A
561
736
881
1046
1235
1187
1287
B*
556
731
876
1041
1230
1182
1282
C
448 615 765 765 1005 793 793
D
524
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 3

- 9 -
TYPE OKC 80 OKC 100 OKC 125 OKC 160 OKC 180 OKC 200
OKC
100/1m
2
OKC
125/1m
2
OKC
160/1m
2
OKC
180/1m
2
OKC
200/1m
2
OKCE
50
OKCE
80
OKCE 100
OKCE
125
OKCE
160
OKCE
180
OKCE
200
CAPACITY K / E l 51 75 / 80 95 / 100 120 / 125 147 / 152 175 / 180 195 /200
MAX OPERATING
OVERPRESSURE IN THE
TANK
MPa 0.6 0.6
MAXIMUM OPERATING
OVERPRESSURE IN THE
EXCHANGER*
MPa - 1
ELECTRIC CONNECTION V 1 PE-N 230V/50Hz
POWER INPUT W 2000 2200
EL. PROTECTION IP 45
MAX TEMPERATURE OF
HSW
°C 80
RECOMMENDED HSW
TEMPERATURE
°C 60
HEIGHT OF THE HEATER mm 561 736 881 1046 1235 1187 1287
DIAMETER OF THE HEATER mm 524 524 524 524 524 584 584
MAX WEIGHT OF THE
HEATER WITHOUT WATER
kg 30 42/36 52/58/42 58/64/48 66/72/58 72/77/72 78/83/76
TIME OF EL. HEATING
FROM 10°C TO 60°C
hour 1.5 2.5 33.8 5 5 5.5
HEAT LOSSES/ENERGY
EFFICIENCY CLASS
kWh/24h
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 AT FLOW OF 720
l/hr
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 AT FLOW OF 310
l/hr
min - 50 48 55 75 77 86
TYPE
OKC
100/1m
2
OKC
125/1m
2
OKC
160/1m
2
OKC
180/1m
2
OKC
200/1m
2
EXCHANGER HEAT
SURFACE
m2- - 1.08 1.08 1.08 1.08 1.08
RATED THERMAL OUTPUT
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
* The OKCE series heaters do not have a heat exchanger
Table 4

- 10 -
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 edge of the heater was
placed at least 600 mm above the floor (
Figure 1, Figure 2). 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 (Figure 4). 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.

- 11 -
2.3 PLUMBING FIXTURE
Connection of heaters to plumbing fixtures is illustrated on Figure 4and Figure 6. 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. 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. 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.
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.
Figure 3

- 12 -
Required pressures – Table 5.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
0.7
0.7
up to 0.56
1
1
up to 0.8
Table 5
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.
2.4 ELECTRIC WIRING
2.4.1 ELECTRIC INSTALLATION GENERAL INFORMATION
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

- 13 -
•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
authorised to such activity.
•Expert connection must be confirmed on the warranty certificate.
•The heater is connected to the 230 V/50 Hz electric network using a fixed moving
conductor with a switch that turns off all network poles and the circuit breaker
(protector).
•Installations in bathrooms, laundromats, rest rooms, and showers, norm must be
obeyed.
•The degree of protection of electric parts of the heater is IP 45.
•Respect the rules of protection against electrical injuries in accordance with norms.
Figure 5
2.5 CONNECTION OF INDIRECT HEATER TO HOT WATER HEATING
SYSTEM
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.

- 14 -
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 (Figure 6) 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 (Figure 6).
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
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.

- 15 -
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 also the installation to
the hot water heating system. Check proper placement of thermostat sensors; The sensors in
the thermo well have to be inserted all the way.
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 commencing operation, flush the heater until the cloudiness in the water is gone.
8. 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.
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.

- 16 -
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.

- 17 -
2.9 MOST FREQUENT FUNCTION FAILURES AND THEIR CAUSES
Potential failures – Table 6
FAILURE SYMPTOM
LED
SOLUTION
Water is cold
•is on
•is not on
•the temperature set on the
thermostat is too low
•heating element silure
•no supply voltage
•termostat silure
•safety termostat shut off
probably due to failed
operation termostat
Water is not warm
enough
•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
•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.
3OPERATION OF THERMOSTAT
3.1 OPERATING MODES
3.1.1 SERVICING
Service devices of heaters of 50 to 200 l capacity are located under the transparent guard of the control
panel. (Figure 7).

- 18 -
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“.
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).
Lower temperature range
limit (about 5°C)
Fixed point on the control
panel
“Anti-freezing” temperature
(about 8°C)
Upper temperature range
limit (about 74°C)
”Ideal” temperature
(about 60°C)
To block the setting
Regulation limited

- 19 -
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.
4IMPORTANT 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 0.48 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.
-All electric installation handling, adjustment and replacement of the regulation elements shall only
be performed by an authorised service company.
-The thermal fuse must not be turned off! In case of thermostat defect, the thermal fuse interrupts
electric power input to the heating element if the water temperature in the heater exceeds 90 °C.
-As an exception, the thermal fuse may also switch off due to water overheating caused by
overheating the hot water heating system boiler (in case of a combined heater).
-We recommend you operate the heater with one type of energy.
Both the electric and water installation must follow and meet the requirements and
regulations relevant in the country of use!

- 20 -
4.2 DISPOSAL OF PACKAGING MATERIAL AND FUNCTIONLESS
PRODUCT
A service fee for providing return and recovery of packaging material has
been paid for the packaging in which the water heater was delivered. The
service fee was paid pursuant to Act No 477/2001 Coll., as amended, at EKO-
KOM a.s. The client number of the company is F06020274. Take the water
boiler packages to a waste disposal place determined by the town. When the
operation terminates, disassemble and transport the discarded and
unserviceable heater to a waste recycling centre (collecting yard), or contact
the manufacturer.
5PRODUCT ACCESSORIES
The product is supplied with a safety valve, 2 – 4 fastening screws M 12x30, 2-4 washers φ13 (OKCE version
has them mounted in the hinges on the heater) and a thermometer. The above parts are packed and placed
in the packaging in the top part of the heater.
It is in your own interest to check the completeness of the accessories.
2-2014