Product Technical Specification; Function Description; Operating Activity; Advice For Customers - Drazice OKCV 200 Operating And Installation Manual

1 PRODUCT TECHNICAL SPECIFICATION

1.1 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 the 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 (Figure 7, Figure 8).

1.1.1 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 and 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 at the inlet to the heat exchanger while heating using el.
energy, 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. Along with a closing valve at the inlet to the heat exchanger, it is recommended to install
an air removal valve, in order to bleed the heat exchanger as needed, in particular before the beginning
of the heating season. The time it takes to heat up using the heat exchanger depends on the temperature
and flow of water in the hot water heating system.

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.
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