Nibe DRAZICE TO - 20.1 Specification sheet

OPERATING AND
INSTALLATION MANUAL
ELECTRIC WATER HEATER
TO –20.1
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 75 °C. We recommend setting service water to max temperature of “OPTIMUM”. 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 –20.1 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 “OPTIMUM” 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 5 °C and 75°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
Upper temperature
range limit (about 75°C)
"Ideal" temperature
(about 55°C)
Lower limit of temp.
scope (around 5°C)
"Anti-freezing" temperature
(about 10°C)