Dražice OKCE 80, OKC 100, OKC 100/1m2, OKC 125, OKC 125/1m2 Operation And Installation Manual

Operation and Installation Manual

TANK-TYPE WATER HEATERS FOR VERTICAL

MOUNTING

Combined Electric

OKCE 50
OKC 80 OKCE 80
OKC 100 OKC 100/1m2 OKCE 100
OKC 125 OKC 125/1m2 OKCE 125
OKC 160 OKC 160/1m2 OKCE 160
OKC 180 OKC 180/1m2 OKCE 180
OKC 200 OKC 200/1m2 OKCE 200

Družstevní závody Dražice – strojírna s.r.o.

Dražice 69

294 71 Benátky nad Jizerou

Tel.: [phone], fax: [phone]

www.dzd.cz
[e-mail]

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Read carefully the below instructions prior to the installation of 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.

The manufacturer reserves the right for engineering modification of the product.
The product is designed for permanent contact with drinkable water.

Guide Contents

1. FUNCTION DESCRIPTION ............................................................................................................... 2

2. MESSAGE FOR CUSTOMERS .......................................................................................................... 3

3. TECHNICAL DESCRIPTION ............................................................................................................. 3

4. OPERATING ACTIVITY .................................................................................................................... 3

5. SERVICING ......................................................................................................................................... 4

6. WALL MOUNTING ............................................................................................................................ 5

7. PLUMBING FIXTURE........................................................................................................................ 5

8. CONNECTION OF COMBINED HEATER TO HOT WATER HEATING SYSTEM ..................... 6

9. ELECTRIC INSTALLATION ............................................................................................................. 6

10. PUTTING THE HEATER INTO OPERATION ................................................................................. 6

11. HEATER CLEANING AND ANODE ROD EXCHANGE ................................................................ 6

12. IMPORTANT NOTICES ..................................................................................................................... 6

13. FIRE-FIGHTING REGULATIONS FOR INSTALLATION AND USE OF HEATER .................... 7

14. INSTALLATION REGULATIONS .................................................................................................... 7

15. MOST FREQUENT FUNCTION FAILURES AND THEIR CAUSES ............................................. 8

16. PRODUCT ACCESSORIES ................................................................................................................ 8

17. TECHNICAL DATA CHART.............................................................................................................9

18. PICTURES.......................................................................................................................................................10

Environment Type:

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%.

1. FUNCTION DESCRIPTION

The heater is designed for accumulation heating of service water using electricity or thermal energy via an

exchanger (for the combined design only).
Water is heated by an electric element (or a heat exchanger) in an enamelled thermally insulated accumulator 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 (Fig. 1).

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2. MESSAGE FOR CUSTOMERS

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.

Energy saving

Hot utility water reservoir is insulated by means of a 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.

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.

Data sheet pursuant to Directive No 442/2004 and Appendix No 7

3. TECHNICAL DESCRIPTION

The heater tank is made of a steel plate and tested by 0.9 MPa overpressure. The inside of the receptacle 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 and sensors of regulation thermostat and safety fuse are located
in the flange lid. Anode rod is mounted on M8 nut. The water reservoir is insulated by means of polyurethane
foam. Electric wiring is placed underneath the plastic removable cover. The temperature of water can be set using
the thermostat.
In combined versions, a heat exchanger is welded in the pressure tank. The heat exchanger is only intended
for the heating circuit.

4. OPERATING ACTIVITY

a) Water heating by electric energy

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

OKC 80 C 8,9 75 2,5 4,8 0,71
OKC 100; OKC 100 /1m2 C 8,8 95 3 6 0,88
OKC 125; OKC 125 /1m2 C 8,7 120 3,8 8 1,09
OKC 160; OKC 160 /1m2 C 8,7 147 5 9,6 1,33
OKC 180; OKC 180 /1m2 C 7,7 175 5 10,6 1,39
OKC 200; OKC 200 /1m2 B 7 195 5,5 12 1,4
OKCE 50 C 9 51 1,5 3 0,45
OKCE 80 C 8,9 80 2,5 4,8 0,71
OKCE 100 C 8,8 100 3 6 0,88
OKCE 125 C 8,7 125 3,8 8 1,09
OKCE 160 C 8,7 152 5 9,5 1,33
OKCE 180 C 7,7 180 5 10,6 1,39
OKCE 200

B 7 200 5,5 12 1,4

Heat losses

kWh/24hr

Time of content

heating (hours)

Electricity consumption

for heating of the

contents from 15°C to

65°C in kWh

Heater types

Energy

efficiency

class

Heat

losses

Wh/24hr/l

Nominal

capacity (l)

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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.
In combined versions, the stop valve on the inlet to the exchanger has to be closed, which prevents heating
water in the hot water heating system.

b) Service water heating via thermal energy through heat exchanger

Closing valves of the heat exchanger must be opened which ensures heating water flow from the hot water
heating system. Together with a closing valve, it is recommended to install an air outlet valve at the inlet to the
heat exchanger in order to bleed the heat exchanger (Fig. 2) as needed, in particular before the beginning of the
heating season. The time of heating using the heat exchanger depends on the temperature and flow of water in the
hot water heating system. A combined heater is made in universal design – depending on the need of connecting
the closing valves to the heating element either from the right, or from the left (Fig.2).

5. SERVICING

Service devices of heaters of 50 to 200 l capacity are located under the transparent guard of the control panel.

Thermostat knob Electric circuit closing indicator lamp Tipping transparent guard

Temperature setting

Water temperature is set by turning the thermostat knob. The desired symbol is adjusted against the fixed point on
the control panel.

Notice: Adjusting the thermostat selector at 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
60°C.
The maximum value to select is “60“.

Limiting the regulation range; locked settings.

For various safety reasons (unintentional scalding, preventing children or unauthorised person from handling), the
regulation range can be limited, or the setting on the thermostat blocked.
Regulation limited - pull off the thermostat knob (it will be tough at first) and you will find two cylindrical pins

2,15mm on the back side of the knob

- pull off one pin and insert it to the corresponding hole of the selected maximum temperature.

- put the knob back on (to the stop).

Lower temperature range
limit (about 5°C)

Fixed point on the control
panel

Anti-freezing temperature
(about 8°C)

Upper temperature range

limit (about 74°C)

”Ideal” temperature (about
60°C)