Dražice OKCE 100 S Specification sheet

OPERATING AND
INSTALLATION MANUAL
STATIONARY ELECTRIC WATER HEATERS
Družstevní závody Dražice - strojírna s.r.o.
Dražice 69, 294 71 Benátky nad Jizerou
Phone.: [phone]
Fax: +420 / 326 370 980
e-mail: [e-mail]
OKCE 100 S/2.2 kW
OKCE 125 S/2.2 kW
OKCE 160 S
OKCE 200 S
OKCE 250 S
OKCE 300 S
OKCE 400 S
OKCE 500 S
OKCE 750 S
OKCE 1000 S

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CONTENTS
1PRODUCT TECHNICAL SPECIFICATION....................................................................................................... 4
1.1 FUNCTION DESCRIPTION ................................................................................................................... 4
1.2 PRODUCT DESCRIPTION .................................................................................................................... 4
1.3 DESIGN AND GENERAL HEATER DIMENSIONS................................................................................... 5
1.4 TECHNICAL PARAMETERS.................................................................................................................. 9
2OPERATION AND FITTING INSTRUCTIONS............................................................................................... 10
2.1 OPERATING CONDITIONS ................................................................................................................ 10
2.2 ELECTRICAL INSTALLATION.............................................................................................................. 10
2.2.1 WIRING FOR: OKCE 100 S/2.2 kW; OKCE 125 S/2.2 kW;......................................................... 10
2.2.2 WIRING FOR: OKCE 160 S, OKCE 200 S, OKCE 250 S, OKCE 300 S, OKCE 400 S, OKCE 500 S.. 11
2.2.3 WIRING SOLELY FOR: OKCE 300 S, OKCE 400 S, OKCE 500 S, OKCE 750 S, OKCE 1000 S ....... 14
2.2.4 PLUMBING FIXTURE................................................................................................................. 16
2.3 FURTHER INFORMATION................................................................................................................. 17
2.4 FIRST COMMISSIONING................................................................................................................... 17
2.5 HEATER CLEANING AND ANODE ROD EXCHANGE........................................................................... 18
2.6 SPARE PARTS.................................................................................................................................... 19
3OPERATION OF THERMOSTAT................................................................................................................. 19
3.1 SERVICING........................................................................................................................................ 19
3.1.1 OPERATING DEVICES OF TANK OKCE 100-125 S/2,2 kw.......................................................... 19
3.1.2 TEMPERATURE SETTING .......................................................................................................... 20
3.2 MOST FREQUENT FUNCTION FAILURES AND THEIR CAUSES .......................................................... 20
4IMPORTANT NOTICES .............................................................................................................................. 21
4.1 INSTALLATION REGULATIONS.......................................................................................................... 21
4.2 TRANSPORT & STORAGE INSTRUCTIONS ........................................................................................ 22
4.3 DISPOSAL OF PACKAGING MATERIAL AND NON-FUNCTIONING PRODUCT.................................... 22
5 ASSEMBLY GUIDE FOR ZIP-FASTENER INSULATION ................................................................................ 23

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Meaning of pictograms used in the Manual
Important information for heater users.
Abiding by the recommendations of the manufacturer serves to ensure trouble-free
operation and the long service life of the product.
Caution!
Important notice to be observed.
CAREFULLY READ THIS MANUAL BEFORE INSTALLING THE WATER 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 product is not intended to be controlled by
a) people (including children) with reduced physical, sensual or mental capacities, or
b) people with insufficient knowledge and experiences unless supervised by responsible person, or unless
properly instructed by such responsible person.
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%. 80%.
Product’s reliability and safety is proven by tests implemented by the Engineering Test Institute in Brno.
Made in the Czech Republic.

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1PRODUCT TECHNICAL SPECIFICATION
1.1 FUNCTION DESCRIPTION
OKCE S line water heaters use only electricity for heating. Their nominal performance provides sufficient
amount of hot water for flat units, premises, restaurants, and similar establishments.
1.2 PRODUCT DESCRIPTION
OKCE 100-125 S/2,2kW
The heater tank is welded from a steel sheet; it is entirely coated with hot water resistant enamel.
For additional corrosion protection a magnesium anode is mounted in the upper part of the heater
to adjust the electric potential inside the tank, reducing the risk of corrosion. The vessels have outlets
of hot and cold water and a circulation opening welded to them. A flange is welded onto the upper bottom
of the receptacle 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. Electric wiring is placed underneath the plastic removable cover.
Temperature indicator is placed on the heater’s housing. The tank is insulated with 42 mm of polyurethane
foam. The heater housing is made of steel sheet provided with a powder coating.
OKCE 160-250 S
The heater tank is welded from a steel sheet; it is entirely coated with hot water resistant enamel.
For additional corrosion protection a magnesium anode is mounted in the upper part of the heater
to adjust the electric potential inside the tank, reducing the risk of corrosion. The vessels have outlets
of hot and cold water and a circulation opening welded to them. At the heaters on the side
under the plastic cover, there is a cleaning and revision opening ended with a flange; various performance
heating units may be mounted into the opening. The heater includes opening G6/4“ which enables
the assembly of heating unit series TJ G6/4“. Temperature indicator is placed on the heater’s housing.
The tank is insulated with 42 mm of polyurethane foam. The heater housing is made of steel sheet provided
with a powder coating.
OKCE 300-500 S
The heater tank is welded from a steel sheet; it is entirely coated with hot water resistant enamel.
For additional corrosion protection a magnesium anode is mounted in the upper part of the heater
to adjust the electric potential inside the tank, reducing the risk of corrosion. The vessels have outlets
of hot and cold water and a circulation opening welded to them. At the heaters on the side
under the plastic cover, there is a cleaning and revision opening ended with a flange; various performance
heating units may be mounted into the opening. The heater includes opening G6/4“ which enables
the assembly of heating unit series TJ G6/4“. Temperature indicator is placed on the heater’s housing.
The tank is insulated with 50 mm of polyurethane foam. The plastic housing (reinforced with polystyrene) is
fitted on the heater.

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TYP OKCE 100 S/2,2 kW OKCE 125 S/2,2 kW
A902 1067
B893 1058
C144 144
D524 524
L535 635
OKCE 750-1000 S
The heater tank is welded from a steel sheet; it is entirely coated with hot water resistant enamel.
For additional corrosion protection a magnesium anode is mounted in the upper part of the heater
on the side to adjust the electric potential inside the tank, reducing the risk of corrosion. The vessels have
outlets of hot and cold water and a circulation opening welded to them. At the heaters on the side
under the plastic cover, there is a cleaning and revision opening ended with a flange; various performance
heating units with various flanges may be mounted into the opening. Temperature indicator is placed
on the heater’s housing. The tank is insulated with 50 mm of polyurethane foam. The heaters include
thermal insulation.
1.3 DESIGN AND GENERAL HEATER DIMENSIONS
OKCE 100 S/2.2 kW; OKCE 125 S/2.2 kW
Figure 1
①3/4" outer
②3/4" inner
③1/2" inner

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OKCE 160 S
Figure 2
OKCE 200 S, OKCE 250 S
Figure 3
①3/4" outer
②3/4" inner
①3/4" outer
②3/4" inner
③
6/4" inner
TYP OKCE 200 S OKCE 250 S
A1357 1537
B685 685
C79 79
D584 584
E859 1059
F1279 1459
G289 289
H813 813
TYP OKCE 160 S
A1047
B685
C79
D584
E519
F966
G289

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OKCE 400S OKCE 500 S
A1920 1924
B734 779
C79 55
D650 700
E514 380
F1194 1264
G304 287
H1289 1409
I1798 1790
J1005 1040
OKCE 300 S
Figure 4
OKCE 400 S, OKCE 500 S
Figure 5
①3/4" outer
②3/4" inner
③6/4" inner
A 1578
B724
C 79
D 670
F 756
G 304
J897
①1" outer
②3/4" inner
③
1/2" inner
S ll
④6/4" inner

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OKCE 750 S, OKCE 1000 S
Figure 6
OKCE 750S OKCE 1000 S
A2030 2050
B1030 1130
C100 100
D1 910 1010
D2 750 850
D3 225 225
E292 300
F947 955
G382 390
H1147 1155
I1893 1910
J1477 155
K1642 1650
①
2" outer
②
5/4" inner
③
1/2" inner
④
5/4" outer

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1.4 TECHNICAL PARAMETERS
MODEL OKCE 100
S/2,2kW
OKCE 125
S/2.2 kW OKCE 160 S
OKCE 200 S OKCE 250 S
VOLUME [l]
100
125
160
220
259
WEIGHT [kg] 39 45 68 76
MAXIMUM TANK
PRESSURE [MPa]
0,6
MAX WARM
WATER
TEMPERATURE
[°C]
90
HEATING PERIOD
Z 10°C – 60 °C [h]
2,9 3,6 According to TPK type (accessory)
LOAD PROFILE
M
L
L
XL
XL
DAILY ELECTRICITY
CONSUMPTION
[kWh]
6,23 12,12 11,96 19,74/19,67 19,23
MIXED WATER
V40 [l]
133,17 156,44 235,47 309,66 418,23
Table 1
MODEL
OKCE 300 S
OKCE 400 S
OKCE 500 S
OKCE 750 S
OKCE 1000 S
VOLUME [l] 314 395 455 750 1000
WEIGHT [kg] 82 103 121 162 211
MAXIMUM TANK
PRESSURE [MPa]
1
MAX WARM
WATER
TEMPERATURE
[°C]
90
HEATING PERIOD
Z 10°C – 60 °C [h]
Based on selected power input of the built-in unit
LOAD PROFILE XL XXL XXL
DAILY ELECTRICITY
CONSUMPTION
[kWh]
20,09 25,6 25,58
MIXED WATER
V40 [l]
419,08 521,89 640,08
Table 2

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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 power 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 temperature at the place of heater installation must be higher than +2°C; and the room
must not freeze. 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 that the thermostat was set to the maximum operation
temperature of 55oC (setting to position „ECO“) – Figure 19.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 ELECTRICAL INSTALLATION
2.2.1 WIRING FOR:OKCE 100 S/2.2 KW; OKCE 125 S/2.2 KW
Perform the connection according to the scheme. Factory connection must not be changed!
(Figure 8). In the electric wiring casing remove the partition corresponding with the input wire
diameter of φ8 nebo φ10 (Figure 7). The degree of protection of electric parts of the heater is IP 42.
Power input of electric element is 2,200 W.
Figure 7
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 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).

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Wiring diagram:
Figure 8
2.2.2 WIRING FOR:OKCE 160 S, OKCE 200 S, OKCE 250 S, OKCE 300 S, OKCE 400 S,
OKCE 500 S
Water heaters must be equipped with a universal electric heating unit with either set or adjustable
heating element performance. A heating unit consists of a flange, to which one or three wells
for ceramic heating elements and one thermowell are welded (seeFigure 9, Figure 10, Figure 11).
The unit is fixed with 12 screws M12 with spacing 210 mm. In the wiring plastic cover, there is
a thermostat and a safety fuse; heater operation control light; and a lead-in wire bushing.
The sensors must be inserted all the way in; first the thermostat and then the safety
fuse.
The performance of heating unit may be adjusted based on either required heating time or connecting
possibilities of electric energy distribution in the place of use.
Parameters of an electric heating unit for:
OKCE 160 S, OKCE 200, OKCE 250, OKCE 300 S, OKCE 400 S, OKCE 500 S
Type
Performance
(kW)
Voltage (V/Hz)
Build-up
length l (mm)
IP
Protection
Weight
(kg)
Mounting
TPK 210 - 12/2.2 kW
2,2
1 PE-N ~ 230 V/50 Hz
440
IP 44
9
12 x M12
TPK 210 - 12/3-6 kW
3 - 4 - 6
3 PE-N ~ 400 V/50 Hz
440
IP 44
15
12 x M12
TPK 210 - 12/5-9 kW
5 - 7 - 9
3 PE-N ~ 400 V/50 Hz
550
IP 44
18
12 x M12
TPK 210 - 12/8-12 kW
8 - 10 - 12
3 PE-N ~ 400 V/50 Hz
550
IP 44
18
12 x M12
Table 3

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After the heater is connected to electric network, the heating element starts heating water. The element is
turned on and off by a thermostat. Thermostat can be set as per your need within the range from 5°C
to 74°C. We recommend setting service water to maximum temperature of 60°C. This temperature ensures
an optimal operation of the heater, reduces heat losses and saves electricity. 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).
When shutting the heater out for an extended period, in winter you can set
the thermostat to the snowflake sign preventing the water from freezing, or turn off
the inlet of electricity to the heater.
Connection, repairs, and wiring inspections may only be implemented by company
(person) authorised to such activity. Expert connection must be confirmed
on the warranty certificate.
Installations in bathrooms, laundry rooms, rest rooms and showers, must be
in compliance with the valid standard.
Adhere to the protection against electric shock injury according to valid standard.
The heater is connected to the electric network using a solid 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 44.
Heating unit - flanges
OKCE 160 S, OKCE 200, OKCE 250, OKCE 300 S, OKCE 400 S, OKCE 500 S
TPK 210-12/2.2 kW TPK 210-12/3-6 kW
Fastening 12 x M12
Figure 9 Fastening 12 x M12
Figure 10

- 13 -
OKCE 300 S, OKCE 400 S, OKCE 500 S Wiring scheme
TPK 210-12/5-9 kW Heating unit 2.2 kW
TPK 210-12/8-12 kW
Figure 11
Figure 12
Wiring scheme
Heating unit 3-6 kW
The 3-6 kW heating unit allows 4 types of connection based on either required time of heating
or possibilities of electric network in the place of use.
TPK 3-6 kW R ~ 1 kW
To achieve chosen performance of the heating unit,
connect the inlet conductor to L1, L2, L3, and N terminal
board,
and interconnect the clips on the 1-10 terminal board
in accordance with the following schemes:
3 kW 1 PE - N AC 230 V / 50 Hz
3 kW 2 PE - N AC 400 V / 50 Hz
4 kW 3 PE - N AC 400 V / 50 Hz
6 kW 3 PE - N AC 400 V / 50 Hz
Figure 13

- 14 -
Heating unit:
TPK 210-12/5-9 kW
TPK 210-12/8-12 kW
TPK 5-9 kW R ~ 1 kW
TPK 8-12 kW R ~ 1,33 kW
TPK 5-9 kW
5 kW 3 PE - N AC 400 V / 50 Hz
7 kW 3 PE - N AC 400 V / 50 Hz
9 kW 3 PE - N AC 400 V / 50 Hz
TPK 8-12 kW
8 kW 3 PE - N AC 400 V / 50 Hz
10.5 kW 3 PE - N AC 400 V / 50 Hz
12 kW 3 PE - N AC 400 V / 50 Hz
Figure 14
2.2.3 WIRING SOLELY FOR:OKCE 300 S, OKCE 400 S, OKCE 500 S, OKCE 750 S,
OKCE 1000 S
Heating units use
Capacity
Flange size
Time of heating from 10°C to 60°C (hours)
L
mm
8
6
5
4
3
2,5
2
1,5
750
Flange
∅
15
RDU 18-6
RDW 18-7.5
RDW 18-10
RSW 18 -12
RSW -18 -15
flange
∅
22
SE 377-8
SE 378-9.5
SE 377-11
SE 378-14
SE 377-16
SE 378-19
1000
flange
∅
15
RDW 18-7.5
RDW 18-10
RSW 18 -12
RSW 18 -15
flange
∅
22
SE 377-8
SE 378-9.5
SE 377-11
SE 378-14
SE 377-16
SE 378-19
Capacity
Flange size
Time of heating from 10°C to 60°C (hours)
L
Mm
8
6
5
4
3
2,5
2
1,5
300
flange
∅
21
RDU 18 – 2.5
RDU 18 – 3
RDU 18-3.8
RDU 18-5
RDU 18-6
RDW 18-7.5
RDW 18-10
400 flange ∅
21
RDU 18 – 3
RDU 18-3.8
RDU 18-5
RDU 18-6
RDW 18-7.5
RDW 18-10
RSW 18 -12
RSW 18 -15
500
flange
∅
21
RDU 18-3.8
RDU 18-5
RDU 18-6
RDW 18-7.5
RDW 18-10
RSW 18 -12
RSW 18 -15
Table 4

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Typ Výkon Zapojení
Délka tělesa
( mm )
Hmotnost
(kg)
REU 18 - 2,5 2,5 1 PE-N AC 230 V / 50 Hz 450 3
RDU 18 - 2,5 2,5 3 PE-N AC 400 V / 50 Hz 450 3,3
RDU 18 - 3 33 PE-N AC 400 V / 50 Hz 450 3,4
RDU 18 - 3,8 3,8 3 PE-N AC 400 V / 50 Hz 450 3,5
RDU 18 - 5 53 PE-N AC 400 V / 50 Hz 450 3,5
RDU 18 - 6 63 PE-N AC 400 V / 50 Hz 450 3,5
RDW 18 - 7,5 7,5 3 PE-N AC 400 V / 50 Hz 450 3,7
RDW 18 - 10 10 3 PE-N AC 400 V / 50 Hz 450 4
RSW 18 - 12 12 3 PE-N AC 400 V / 50 Hz 530 4
RSW 18 - 15 15 3 PE-N AC 400 V / 50 Hz 630 4,2
SE 377* 8,0-11-16 3 PE-N AC 400 V / 50 Hz 610 8
SE 378* 9,5-14-19 3 PE-N AC 400 V / 50 Hz 610 11,5
* Pouze pro ohřívače 750 a 1000 litrů
Electrical heating units REU, RDU, RDW and RSW can be by reduction flange 210/150 mounted in heaters
with 300,400 and 500 litre volume.
Electrical heating units REU, RDU, RDW and RSW can be by reduction flange 225/150 mounted in heaters
with 750 and 1000 litre volume.
Table 5
Capacity
Time of heating from 10°C to 60°C (hours)
L
864,5 3,5 32,5 2,1 1,8 1,6 1,4
300
TPK
210/2.2
TPK 210/3-6
TPK 210/3-6
TPK 210/5-9
TPK 210/3-6
TPK 210/5-9
TPK 210/8-12
TPK 210/5 - 9
TPK 210/8-12
TPK 210/8-12
Connectio
n
2.2 kW 3 kW 4 kW 5 kW 6 kW 7 kW 8 kW 9 kW 10 kW 12 kW
Table 6
Capacity
Time of heating from 10°C to 60°C (hours)
L
11,3 864,7 43,4 32,6 2,4 2
400
TPK
210/2.2
TPK 210/3-6
TPK 210/3-6
TPK 210/5-9
TPK 210/3-6
TPK 210/5-9
TPK 210/8-12
TPK 210/5 - 9
TPK 210/8-12
TPK 210/8-12
Connectio
n
2.2 kW 3 kW 4 kW 5 kW 6 kW 7 kW 8 kW 9 kW 10 kW 12 kW
Table 7
Capacity
Time of heating from 10°C to 60°C (hours)
L
14,1
9,8
7,5
6
5
4,2
3,7
3,3
3
2,5
500
TPK
210/2.2
TPK 210/3-6TPK 210/3-6TPK 210/5-9TPK 210/3-6TPK 210/5-9TPK 210/8-12 TPK 210/5 - 9TPK 210/8-12 TPK 210/8-12
Connectio
n
2.2 kW
3 kW
4 kW
5 kW
6 kW
7 kW
8 kW
9 kW
10 kW
12 kW
Table 8
Reduction flange 210/150 Reduction flange 225/150
Figure 15
Figure 16

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2.2.4 PLUMBING FIXTURE
Power water connects to pipes with ¾“ 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“. The 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 by standard. Heaters 300 l are supplied
without 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
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 (When assembling the security equipment, follow
the standard). 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 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 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 the recommended drain valve. First, close the water supply
into the heater.
Find necessary pressure values in the below – Table 9. When assembling the security equipment, follow
the standard. For proper safety valve operation, a backflow valve shall 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. At least one demountable joint must be mounted between the tank and every supply pipe.
Adequate piping and fittings with sufficiently dimensioned maximum temperature and pressure values
must be used.

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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 the standard.
SAFETY VALVE
START-UP
PRESSURE
[MPa]
ALLOWABLE
OPERATING
OVERPRESSUR
E 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 9
2.3 FURTHER INFORMATION
300-1000 litre capacity heaters are screwed onto the bottom wooden palette
with M12 screws. When the heater is released from the palette and prior to its putting
into operation, 3 adjustable legs supplied as the product accessories have to be installed.
With these legs, the heater may be positioned vertically to the base, within 10 mm.
2.4 FIRST COMMISSIONING
After connecting the heater to the water main, electrical power system, and after checking the safety valve
(following the instructions attached to the valve), the heater can be put into operation.
Procedure:
a) Check the water main and wiring; Check proper placement of thermostat sensors. The sensors must
be inserted all the way in; first the thermostat and then the safety fuse;
b) Open the hot water valve on the combination faucet;
c) open the cold water inlet valve to the heater;
d) when the water starts flowing through the hot water valve, the filling of the heater is finished
and the valve needs to be closed;
e) If a flange lid leak is discovered, the flange lid bolts need to be tightened;
f) Fasten the electric installation cover;
g) When commencing operation, flush the heater until the cloudiness in the water is gone;
h) Make sure to fill in properly the warranty certificate.

- 18 -
Figure 17
2.5 HEATER CLEANING AND ANODE ROD EXCHANGE
Repetitive water heating causes limestone sediment on both the enamelled tank walls and chiefly
the flange lid. Lime scale settling depends on hardness of heated water, its temperature and on the volume
of hot water used.
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 a company in charge of service affairs deal
with the cleaning and exchanging of the anode. When discharging water from the heater, the mixing valve
battery for hot water must be open in order to avoid creating underpressure that would prevent water
discharge.

- 19 -
To prevent the occurrence of bacteria (e.g. Legionella pneumophila) within stack heating
it is recommended, if absolutely necessary, to increase the temperature of hot service
water (HSW) periodically for a transitional period of time to at least 70
℃
to make use of another way of disinfecting HSW.
2.6 SPARE PARTS
- flange lid - flange lid seal - set of M12 (or M10) bolts
- thermostat and thermal fuse -magnesium anode - insulation flange lid
- control lights with wires - control button - capillary thermometer
for the thermostat
- Heating unit
When ordering spare parts, define the part name, type, and type number from the heater label.
3OPERATION OF THERMOSTAT
3.1 SERVICING
3.1.1 OPERATING DEVICES OF TANK OKCE 100-125 S/2,2 kW
Thermostat's control panel Thermostat knob
Figure 18
Thermostat and no other part of the control panel is not a bearing part which can be used
for any handling with the heater.

- 20 -
Upper limit of temperature
scope (around 80°C)
Antifreeze temperature
(around 8°C)
Lower limit of temperature
scope (around 5°C)
Fixed point on control
panel
Optimum temperature
(around 55°C)
3.1.2 TEMPERATURE SETTING
Water temperature is set by turning the thermostat knob. The desired symbol is adjusted against the fixed
point on the control panel (Figure 19).
Figure 19
Adjusting the thermostat knob to 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 55°C. Select the "ECO“ symbol
as the maximum.
3.2 MOST FREQUENT FUNCTION FAILURES AND THEIR CAUSES
FAILURE SYMPTOM
INDICATOR
SOLUTION
Water is cold
•Light on
•Heating element failure
•Some elements are not
Water is not warm
enough
•Light on
•some element failure
•Failure of a coil in an element
Water is cold
•Light off
•Thermostat failure
•Safety fuse turned off
electricity inlet
•Electric supply outside the
heater interrupted
Temperature of water is
not corresponding with
the temperature set on
•Light on
•Thermostat failure
Table 10