Drazice OKCE 50 Specification sheet

OPERATION AND
INSTALLATION MANUAL
TANK-TYPE WATER HEATERS FOR VERTICAL
MOUNTING
Electric water heaters
OKCE 50
OKCE 80 OKHE 80
OKCE 100 OKHE 100
OKCE 125 OKHE 125
OKCE 160 OKHE 160
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
1 TECHNICAL 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 ....................................................................................... 4
1.3 DESIGN AND GENERAL HEATER DIMENSIONS................................................................................... 6
2 OPERATION AND FITTING INSTRUCTIONS................................................................................................. 8
2.1 OPERATING CONDITIONS .................................................................................................................. 8
2.2 WALL MOUNTING.............................................................................................................................. 8
2.3 PLUMBING FIXTURE........................................................................................................................... 9
2.4 ELECTRIC INSTALLATION.................................................................................................................. 11
2.4.1 GENERAL INFORMATION FOR ELECTRIC INSTALLATION ......................................................... 11
2.5 CONNECTION OF HEATER TO HOT WATER HEATING SYSTEM ........................................................ 12
2.6 FIRST HEATER COMMISSIONING ..................................................................................................... 12
2.7 PUTTING OUT OF SERVICE, DISCHARGE .......................................................................................... 13
2.8 INSPECTION, MAINTENANCE & CARE FOR THE APPLIANCE............................................................ 14
2.9 MOST FREQUENT FUNCTION FAILURES AND THEIR CAUSES .......................................................... 15
3 OPERATION OF THERMOSTAT................................................................................................................. 16
3.1 SERVICING........................................................................................................................................ 16
3.1.1 SERVICE HEATER DEVICES........................................................................................................ 16
3.1.2 TEMPERATURE SETTING .......................................................................................................... 16
4 IMPORTANT NOTICES .............................................................................................................................. 17
4.1 INSTALLATION REGULATIONS.......................................................................................................... 17
4.2 DISPOSAL OF PACKAGING MATERIAL AND MALFUNCTIONING PRODUCT ..................................... 17
5 PRODUCT ACCESSORIES .......................................................................................................................... 18

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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. Water is heated by
an electric element in an enamelled thermally insulated tank 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.
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
Hot utility water reservoir is insulated by means of top-quality polyurethane foam with zero
CFCs 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 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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TYPE
OKCE
50
OKCE
80/
OKCE
100/
OKCE
125/
OKCE
160/
OKCE
180
OKCE
200
OKHE
80
OKHE
100
OKHE
125
OKHE
160
CAPACITY
l
51
80
100
125
152/155
180
200
MAX OPERATING
OVERPRESSURE IN
THE TANK
MPa
0.6
MAX OPERATING
OVERPRESSURE IN
EXCHANGER*
MPa
-
1
ELECTRIC
CONNECTION
V
1 PE-N 230V/50Hz
INPUT
W
2000
2200
EL.PROTECTION
IP 45
MAX HSW
TEMPERATURE
°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
36/37
42
48/49
58
72
76
EL.HEATING TIME
FROM 10°C to 60°C
hour
1.5
2.5
3
3.8
5
5
5.5
Table 1

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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, thermostat
sensors and safety fuses are located in the flange lid. An anode rod is mounted onto the M8 nut. Electric
wiring is placed underneath the plastic removable cover. Description of basic parts of the heater -Figure 1.
Heater dimensions - Figure 2 and Table 2.
1.
Thermometer
2.
heating element well
3.
ceramic heating element 2000W
4.
service thermostat with external control and
safety fuse
5.
electric installation cover
6.
cold water supply pipe
7.
thermowell
8.
hot water withdrawal pipe
9.
Mg anode
10.
enamelled steel receptacle
11.
polyurethane insulation
12.
heater shell
Figure 1

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Technical description: OKCE 50 –200, OKHE 80 - 160
Figure 2
OKCE 50
OKCE 80/
OKHE 80
OKCE
100/
OKHE 100
OKCE 125/
OKHE 125
OKCE 160/
OKHE 160
OKCE 180
OKCE 200
A
572
742/740
887/885
1052/1050
1240/1235
1189
1289
B
569
742/741
887/886
1054/1051
1237/1236
1178
1280
C
455
597/581
747/731
762/761
1020/1004
813
798
D
524
524/516
524/516
524/516
524/516
584
584
E
-
-
-
-
-
600
600
F
14
14/15
14/15
14/15
14/15
14
14
G
116
116/115
116/115
116/115
116/115
116
116
Table 2
Upper suspension
and support
50-160L
2 anchor bolts
Upper and lower
suspension 180, 200 I
4 anchor bolts
Dimensions 450mm
and E
Double check before
drilling

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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 minimum operating
temperature of 60oC (setting to position “60“) - Figure 8. 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 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 2 in 450 mm spacing. Double check the torque
of the suspension bolts on the heater and suspend the heater. Using the detent support in the bottom part
of the heater make sure it runs in parallel with the wall!
Figure 3

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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.
If the water heater is mounted in enclosed areas, inter-ceilings, built-in structures and
recesses, ensure sufficient access to service fittings, electrical terminal boards, anodes and
manholes. Minimum spacing from manhole is 600 mm.
2.3 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 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. 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 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.
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.

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Please find necessary pressure values in the below Table 3. For proper safety valve operation, a backflow
valve (Figure 4) 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. 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.
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 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
the standard.
Figure 4

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2.4 ELECTRIC INSTALLATION
2.4.1 GENERAL INFORMATION FOR ELECTRIC INSTALLATION
Perform the connection according to the scheme. Factory connection must not be changed! (Figure 6
).
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.
Figure 5
It is necessary to observe the below requirements during the electric wiring.
Heater is connected to power supply 3 PEN AC 400V/50Hz via a fixed movable wire.
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 standard.
To adjust the distance from the wall, connect the wire of the external protective
bonding!
Adhere to the rules of protection against electrical injuries as advised
in the standard.
Figure 6

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2.5 CONNECTION OF HEATER TO HOT WATER HEATING SYSTEM
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.
________ Hot water
- - - - - - - - Cold water
Figure 7
2.6 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.
Before fist putting into service or after a longer shutdown the appliance has to be rinsed
out and flushed yet before heating is activated. Before heating starts, the tank must
be completely filled with water and the system properly flushed and vented. First heating
of the tank has to be watched.

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Procedure of putting the heater into operation:
1. Check the water main and wiring. 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. Screw down the electric installation guard.
7. When hot service water is heated 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.
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 (water can be also drained
through safety valve; for that purpose, the safety valve is turned to the "Check" position).
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
put in service again, it has to be ensured that it is filled with water and the water flowing
out at the hot water valves is free of bubbles.

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2.8 INSPECTION, MAINTENANCE & CARE FOR THE APPLIANCE
During the heating process the water that increases its volume during the heating must
visibly drip off the safety valve outlet (in non-pressurised connection this water drips
off the combination faucet valve). In full heating (about 74°C) the volumetric water gain is
approx. 3.5 % of the tank capacity. The function of the safety valve has to be checked
regularly. If the safety valve control knob is lifted or turned to the “Control” position,
the water must flow out easily, without any obstacles, from the safety valve element
to the outfall line. In common operation, such a check needs to be carried out 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 water pressure in the supply
piping is either too high (if higher than 5.5 bars, a pressure control valve has to be fitted), 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 –dismantle the flange
lid and clean the tank. A new sealing has to be used for re-fitting. Since the inside of the
heater has special enamel, which must not get in contact with the 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 (such as liquid sand, chemicals - acid, alkaline) or dye thinners (such as cellulose
thinner, trichlor, and the like) to clean the outer shell of the heater. For cleaning use a wet
clout and add a few drops of liquid cleaning agent for household applications. 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. If the anode is only blocked with sediments clean its surface and, if used up,
mount a new one. Have the company in charge of service affairs clean and exchange
the anode. When draining water from the heater, the combination faucet valve for hot water
must be open, preventing occurrence of under-pressure in the heater tank which would stop
water from draining.

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2.9 MOST FREQUENT FUNCTION FAILURES AND THEIR CAUSES
FAILURE SYMPTOM
CONTROL LIGHT
SOLUTION
Water is cold
light on
The temperature set on the
thermostat is too low;
heating element failure
Water is cold
light off
No supply voltage;
Thermostat failure
Safety thermostat shut off
probably due to failed
operation thermostat
Water is not warm
enough
light on
Failure of one of the coils in
the element (2x 1000W)
Temperature of water is
not corresponding with
the temperature set on
the control
Defective thermostat
Water is constantly
dripping off the safety
valve
light off
high input pressure
defective safety valve
Table 4
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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3OPERATION OF THERMOSTAT
3.1 SERVICING
3.1.1 SERVICE HEATER DEVICES
The service devices are located under the plastic guard of the control panel (Figure 8).
Thermostat knob Electric circuit closing indicator lamp Tipping plastic guard
Figure 8
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 9).
Figure 9
Adjusting the thermostat selector 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 65°C. Select the "60“ symbol as the minimum.
temperature range lower
limit (around 5°C)
fixed point on control panel
“antifrost temperature”
(around 8°C)
pevný bod na ovládacím
panelu
teplota „proti zamrznutí“
(kolem 8°C)
temperature range upper
limit (around 74°C)
„ideal“ temperature
(around 60°C)
„optimální“ teplota
(kolem 60°C)

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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.
Both the electric and water installation must follow and meet the requirements and
regulations relevant in the country of use!
4.2 DISPOSAL OF PACKAGING MATERIAL AND MALFUNCTIONING
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.

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5PRODUCT ACCESSORIES
The product is supplied together with a safety valve 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.
12-2-2015