Nibe DRAZICE TO-20 Specification sheet

OPERATING AND
INSTALLATION MANUAL
ELECTRIC WATER HEATER
TO - 20
Družstevní závody Dražice-strojírna s.r.o.
Dražice 69, 294 71 Benátky nad Jizerou
tel.: +420 / 326 370 911
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................................................................................... 5
2 OPERATION AND FITTING INSTRUCTIONS................................................................................................. 6
2.1 OPERATING CONDITIONS .................................................................................................................. 6
2.2 WALL MOUNTING.............................................................................................................................. 6
2.3 PLUMBING FIXTURE........................................................................................................................... 7
2.4 ELECTRIC WIRING .............................................................................................................................. 9
2.4.1 ELECTRIC INSTALLATION GENERAL INFORMATION................................................................... 9
2.5 FIRST HEATER COMMISSIONING ..................................................................................................... 10
2.6 PUTTING OUT OF SERVICE, DISCHARGE .......................................................................................... 10
2.7 INSPECTION, MAINTENANCE & CARE FOR THE APPLIANCE............................................................ 11
2.8 MOST FREQUENT FUNCTION FAILURES AND THEIR CAUSES .......................................................... 12
3 IMPORTANT NOTICES.............................................................................................................................. 12
3.1 INSTALLATION REGULATIONS.......................................................................................................... 12
3.2 DISPOSAL OF PACKAGING MATERIAL AND FUNCTIONLESS PRODUCT ........................................... 13
4 PRODUCT ACCESSORIES .......................................................................................................................... 13

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CAREFULLY READ THIS MANUAL BEFORE INSTALLING THE WATER HEATER!
Dear Customer,
Družstevní závody Dražice - strojírna s.r.o., 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 %.
Product’s reliability and safety is proven by tests implemented by the Engineering Test Institute in Brno.
Made in the Czech Republic.
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.

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1TECHNICAL SPECIFICATION OF PRODUCT
1.1 FUNCTION DESCRIPTION
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 max temperature of 60 °C. This temperature ensures
the optimal operation of the heater. 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 12 °C (set the “snowflake” symbol on the thermostat selector)
to avoid its freezing.
1.2 ADVICE FOR CUSTOMERS
1.2.1 HOT WATER CONSUMPTION
With its design, the electric accumulation heater TO - 20 is suitable for installations
in bathrooms, lavatories, kitchens or near sanitary units of panel flats, and complies with the
requirements of Standards, with the IP 44 protection class. Its benefit is that it heats up water
by power in an unlimited all-day time range. The time of heating service water to the
recommended temperature of 60 °C is about 31 minutes.
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.
1.2.2 ENERGY SAVING
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.
1.2.3 EMERGENCY POWER CONSUMPTION
According to current legislation, the standby consumption is stated in the value of annual
consumption of electric energy (kWh), which is measured according to the corresponding load
profile and calculated according to the formulas and requirements of EU Regulation
No. 812/2013.

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1.3 DESIGN AND GENERAL HEATER DIMENSIONS
The heater tank is made of a steel plate and tested by 1.5 multiple of operation pressure value. The inner
surface of the tank is provided (except the stainless coil) with anticorrosion protection of enameled glaze.
In the bottom part of the tank there are wells for placing the heating, regulation and safety element of the
water heater (heating element with right thread G 5/4", thermostat sensor and thermal fuses).
A thermometer is installed in the top part of the heater that transmits information on heating the volume
of service water. The heater tank is provided with a highly valuable polyurethane insulation which ensures
minimum heat losses.
Electric wiring is placed in the bottom part of the heater, under an easily removable guard of the heater
(by loosening two screws on that guard). Temperature of water can be set by a thermostat within the range
between 0 °C and 74°C, using the symbols on the thermostat selector button Figure 1. Cold water inflow
is indicated with a blue ring, hot water outflow is indicated with a red ring. All steel parts are protected
against corrosion with paint and galvanic coating. To ensure anticorrosion protection, the heating element
head is provided with an anode rod that dissolves when the heater is in operation and has to be replaced
after 3 years of operation (depending on the aggressiveness of water).
Figure 1

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2OPERATION AND FITTING INSTRUCTIONS
2.1 OPERATING CONDITIONS
The tank shall only be used in accordance with the conditions specified on the performance plate
and in instructions for electric wiring. Besides legally acknowledged national regulations
and standards, also conditions for connection defined in local electric and water works have to
be adhered to, as well as the installation and operation manual. The room, in which
the appliance will be operated, must be frost-free. The appliance has to be mounted
at a convenient place, it means that the appliance must be easily available for potential
necessary maintenance, repair or replacement, as the case may be.
If water is strongly calcareous, we recommend that any of the common decalcifying device was
installed with the appliance, or the thermostat to be set to the minimum operation temperature
of 60 °C. For proper operation, drinkable water of adequate quality shall be used.
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. We recommend entrusting wall mounting and anchoring to a specialist
company or discussing the anchorage with an expert.
Figure 2
TO 20
A
579
B
263
D
502
E
357
H
240
K
98
R
180

1/2" outer

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TO 20
VOLUME
l
20
MAX OPERATING OVERPRESSURE IN THE TANK
bar
6
ELECTRICAL CONNECTION
-
1/N/PE ~ 230 V / 50 Hz
INPUT
W
2200
EL. PROTECTION
-
IP 44
MAX OPERATING TEMPERATURE OF HOT WATER
(HW)
°C
80
RECOMMENDED HOT WATER (HW)
TEMPERATURE
°C
60
HEIGHT OF THE HEATER
mm
579
HEATER DIAMETER
mm
502
MAX WEIGHT OF THE HEATER WITHOUT WATER
kg
12
TIME OF EL. HEATING FROM 10°C TO 60°C *
hours
0.5
MIXED WATER V40
l
26.14
LOAD PROFILE
-
S
ENERGY EFFICIENCY CLASS
-
A
ENERGY EFFICIENCY
%
38
ANNUAL CONSUMPTION OF ELECTRIC ENERGY
kWh
485
Table 1
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.
When mounted directly under the ceiling, the distance from the ceiling has to be 100 mm
at least
2.3 PLUMBING FIXTURE
The safety valve can be mounted both in vertical and horizontal position in the indicated
direction of cold water flow. Safety valve is mounted on the cold water inlet identified with
a blue ring.
The heater must be equipped with a membrane, spring-loaded safety valve. Safety valves with
fixed pressure settings from the manufacturer are used for the assembly. Each individually
lockable heater must be fitted with a cap on the cold water inlet, a test valve or a stopper to
check the operation of the check valve, with a drain valve, a check valve and a safety valve
(Figure 3). The safety valve with a check valve is supplied with the heater.

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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.
Find necessary pressure values in the below - Table 2.
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 3
Table 2
SAFETY VALVE STARTING
PRESSURE [MPa]
ADMISSIBLE OPERATING
WATER HEATER
PRESSURE [MPa]
MAX. PRESSURE IN THE
COLD WATER PIPE [MPa]
0.6
0.6
to 0.48

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2.4 ELECTRIC WIRING
2.4.1 ELECTRIC INSTALLATION GENERAL INFORMATION
The electric wiring scheme is attached to the water heater on the inner side of the removable front guard
(Figure 4).
The degree of protection of electric parts of the heater is IP 44. Power input of electric element is 2200 W.
It is necessary to observe the below requirements during the electric wiring:
•The heater is connected to the 230V/50Hz electric network using a fixed moving conductor.
•Connection, repairs, and wiring inspections may only be implemented by a company
(person) authorized to such activity. Expert connection must be confirmed on the warranty
certificate
•The circuit must contain circuit breaker (protector).
•In order to enhance the protection of connection in bathrooms and shower inserts pursuant
to Standard, the appliance is provided with a grounding terminal for connecting
with a yellow-green protective conductor on minimum section 4 mm2.
•To adjust the distance from the wall, connect the wire of the external protective bonding!
•Respect the rules of protection against electrical injuries in accordance with Standards.
•Access to the electric part of the heater is enabled only upon disconnecting the heater from
power supply and unscrewing the guard of the heater.
Figure 4
If the supply cord is damaged, it must be replaced by a company (person) authorized to such
activity in order to avoid a hazard.

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2.5 FIRST HEATER COMMISSIONING
Before opening the power supply, the tank must be filled with water. The process of first heating
must be executed by licensed professional who has to check it. Both the hot water outlet pipe
and safety armature parts may be hot.
During the heating process the pressurized connection water that increases its volume due to
heating must drip off the safety valve. In non-pressurized connection water drips off the
overflow combination faucet. When heating is finished, the set temperature and the actual
temperature of consumed water should be roughly equal. After connecting the heater to the
water main and electrical power system, and after checking the safety valve (following
the instructions attached to the valve), the heater can be put into operation.
Procedure of putting the heater into operation:
1. Check the wiring and water supply; check correct position of the thermostat sensors, they have to
be inserted all the way. 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. Prior to putting the heater into operation, screw on the front heater guard which closes the access
to the electric compartment of the heater.
6. When hot service water heating by electric energy, switch on the power supply.
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.
2.6 PUTTING OUT OF SERVICE, DISCHARGE
If the hot water heater is put out of service for a longer time, or if it is not going to be used it
has to be drained and disconnected from the electric supply network. 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 jeopardized by frost. When the tank is to be used again, it has to be filled with water
and one needs to make sure that the water flowing out at the hot water valves did not contain
any bubbles.
2.7 INSPECTION, MAINTENANCE & CARE FOR THE APPLIANCE
During the heating process the water that increases its volume during the heating must drip off
the safety valve outlet (in non-pressurized connection this water drips off the combination
faucet valve). In full heating (about 74 °C) 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.
Attention! 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 specialized plumber immediately!
Repetitive water heating causes limestone sediment on both the enameled 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 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 the water from draining.

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2.8 MOST FREQUENT FUNCTION FAILURES AND THEIR CAUSES
Table 3
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.
3IMPORTANT NOTICES
3.1 INSTALLATION REGULATIONS
-Without a confirmation of performed electrical and plumbing fixture issued by an authorized
company the warranty certificate shall be void.
-You have to apply for approval of a local power supplier to connect the heater.
-All hot water outlets must be provided with a combination faucet.
-It is not allowed to handle the thermostat in any manner whatsoever, aside from temperature
resetting with a control button.
-All electric installation handling, setting, and regulation feature exchange, may only be implemented
by an authorized 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!
We would like to emphasize that the heater must not be connected to power supply if work
involving flammable liquids (petrol, spot remover) or gases, etc., is performed nearby.
FAILURE SYMPTOM
LED
SOLUTION
Water in tank is cold
•Light on
•Heating element failure
Water in the tank is not
warm enough
•Light on
•Heating element failure
Water in the tank is cold
•Light off
•Thermostat failure - the safety
fuse turned off electricity supply
•Power supply outside the heater
discontinued
Water in the tank does not
correspond with
temperature set
•Thermostat failure

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3.2 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 center (collecting yard), or contact the manufacturer.
4PRODUCT ACCESSORIES
The product is supplied with a safety valve G1/2", screws 6 x70 mm - 2 pcs, plastic dowels 12x60 mm - 2 pcs.
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.
30-8-2021