Drazice TO-20 Specification sheet

OPERATING AND

INSTALLATION MANUAL

ELECTRIC ACCUMULATION WATER HEATER

TO - 2060-SMART

Družstevní závody Dražice-strojírna s.r.o.

(Works Cooperative - Dražice - Machine Plant, Ltd.)

Dražice 69, 294 71 Benátky nad Jizerou

tel.: +420 / 326 370 911

fax: +420 / 326 370 980

e-mail: export@dzd.cz

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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 ....................................................................................... 4

1.3 DESIGN AND GENERAL HEATER DIMENSIONS................................................................................... 5

2OPERATION AND FITTING INSTRUCTIONS.................................................................................................6

2.1 OPERATING CONDITIONS .................................................................................................................. 6

2.2 WALL MOUNTING.............................................................................................................................. 6

2.3 PLUMBING FIXTURE........................................................................................................................... 8

2.4 ELECTRIC WIRING ............................................................................................................................ 10

2.4.1 ELECTRIC INSTALLATION GENERAL INFORMATION.................................................................10

2.5 FIRST HEATER COMMISSIONING ..................................................................................................... 10

2.6 PUTTING OUT OF SERVICE, DISCHARGE .......................................................................................... 11

2.7 INSPECTION, MAINTENANCE & CARE FOR THE APPLIANCE............................................................ 12

2.8 MOST FREQUENT FUNCTION FAILURES AND THEIR CAUSES .......................................................... 13

3IMPORTANT NOTICES .............................................................................................................................. 13

3.1 INSTALLATION REGULATIONS.......................................................................................................... 13

3.2 DISPOSAL OF PACKAGING MATERIAL AND FUNCTIONLESS PRODUCT ........................................... 14

4PRODUCT ACCESSORIES .......................................................................................................................... 14

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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.

Made in the Czech Republic.

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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 7°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

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

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. 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. 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.

Data Sheet pursuant to Directive No to see in Table 1.

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Table 1

1.3 DESIGN AND GENERAL HEATER DIMENSIONS

The heater tank is made of a steel plate and tested by 0.9 MPa overpressure. The inner surface of the tank is

provided (except the stainless coil) with anticorrosion protection of enamelled 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

TYPE

TO - 20

UNIT HEAT LOSS [Wh/24h/l]

NOMINAL CAPACITY [l]

TIME OF CONTENT HEATING BY

50°C [hours]

0.5

ELECTRICITY CONSUMPTION FOR

HEATING OF THE CONTENTS FROM

LOAD PROFILE

DAILY ELECTRICITY CONSUMPTION

[kWh]

2.24

MIXED WATER V40 [l]

26.92

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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. It is

recommended to use the product in an indoor environment with air temperatures from

+2°C to 45°C and maximum relative humidity of 80%. 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. Parameters are in Table 2.

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 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 2in 180 mm spacing, and screw firmly a steel hinge

onto the wall. Check its proper vertical positioning. Double check the torque of the suspension bolts on the

heater and suspend the heater. If needed, the suspension bolts can be shifted by 50 mm in vertical direction.

Using the detent support in the bottom part of the heater make sure it runs in parallel with the wall!

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Figure 2

Table 2

TO 20

579

266

502

346

251

180



1/2" outer

PARAMETER

VALUE

RATED PRESSURE [MPa] 0.6

CAPACITY [l] 20

VOLTAGE/FREQUENCY [V/Hz] 230/50

POWER INPUT [W] 2200

DIAMETER OF THE HEATER [mm] 502

HEIGHT OF THE HEATER [mm] 597

WEIGHT [kg] 12

EL. PROTECTION IP 44

HEAT LOSSES/ENERGY

EFFICIENCY

CLASS [kWh/24h]

0.28

TIME OF EL. HEATING FROM

10°C TO 60°C 31

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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 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 50 mm at least.

2.3 PLUMBING FIXTURE

Connection to plumbing fixtures is illustrated on Figure 3.For potential disconnection of the

heater, the service water inlets and outlets must be provided with screw coupling G1/2“. 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 heaters must be equipped with a drain valve.

Each hot service water pressure heater must have a safety valve with a membrane spring. 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 to the right. 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. The cold water inlet of each individually

closable heater must be fitted with a seal, test tap or plug to check the non-return valve, as

well as a non-return valve and safety valve. Heaters with a volume of more than 200 litres

must also be fitted with a pressure gauge.

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 a recommended drain valve. First, close water input into the

heater. Find necessary pressure values in the following Table 3.For proper safety valve

operation, a backflow valve must be mounted on the inlet pipes, preventing spontaneous

heater draining and hot water penetrating back into the water main. When assembling the

security equipment, follow Standards.We recommend that the hot water distribution from

the heater was as short as possible to minimise heat losses.

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Figure 3

SAFETY VALVE

STARTING

PRESSURE

[MPa]

ADMISSIBLE

OPERATING

WATER HEATER

PRESSURE [MPa]

MAX. PRESSURE IN

THE COLD WATER

PIPE [MPa]

0.6

to 0.48

0.7

to 0.546

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 Standards.

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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 with a switch that turns off all network poles and the circuit breaker

(protector).

•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 circuit must contain a breaker disconnecting all poles of the network, and

a 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

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.

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