Bedienungsanleitung Thermona THERM EL 15 (Seite 22 von 37) (Englisch)

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Electric boiler operation is very simple and fast and does not require any special qualification. The boiler can

be nevertheless controlled only by adults who have been demonstrably explained the boiler function and

operation. This demonstration must be performed by the worker who carried out the installation and set the

boiler into operation.

 If the display is turned on, the control supply voltage is fed to the boiler.

 Set the room thermostat (or other control element) to the required temperature.

 Display the current heating water temperature by pressing the Arrow Up button. To switch on the boiler

press the O/I button in the heating temperature setting section. Concurrently, the circular pump is

switched on which runs for the period defined by the set parameters. The heating function is indicated

by the LED pilot light in the left section of the control panel = “HEATING”.

 After the set temperature has been reached, the automatic controlling system gradually switches off the

heating bodies in order to maintain the heating water temperature within the range specified by the

parameters.

 First heating: maintain the highest possible service temperature of the heating medium in the system for

the first four hours. The system must be carefully deaereated while in operation to rid it reliably off the

remaining air after the previous bleeding in the cold state. When the system cools down, refill it with

water.

 If a power outage (or MRC signal interruption) occurs, the boiler is shut down. When the power supply

is renewed, the electric boiler restarts its operation.

 No objects can be placed on the jacketing or inside the electric boiler. Cleaning of the electric boiler

external surface is recommended only by a damp cloth.

 It is recommended to bleed the heating system regularly and remove the deposited impurities by

discharging small amounts of the liquid through the discharge cock assuring that also sediments at the

bottom of the boiler vessel are washed out.

 Switch off the boiler after the end of the heating season by the circuit breaker. It is recommended to

start the boiler for roughly 30 seconds every month to spin the pump outside the heating season.

 Minimum water pressure at the circular pump inlet must be 5 kPa (the water temperature must not

exceed 75°C).

 Check whether the air charge pressure specified on the expansion vessel label is sufficient for the

heating system (system static height of 5 m corresponds to the air charge pressure of 50 kPa, 10 m =

100 kPa, 15 m = 150 kPa) prior to the boiler connection to the heating system.

Setting the pressure in the expansion vessel

When the system is filled with the heat carrier and properly vented, write down the displayed system water

pressure value. Correct the air charge pressure in the expansion vessel to the same value by bleeding. Adjust the

system pressure value to at least 10 kPa by filling more water into the system. If the air charge pressure in the

expansion vessel is not correctly adjusted, similar defects – big changes in pressure during operation – occur as

in the case of an insufficiently rated expansion vessel.

♦ Maintenance

Regular maintenance is very important for a reliable operation and high durability of the boiler and its

components. The user is recommended to contact the manufacturer via a local authorized service organization

and ensure regular inspections after every year of operation (which is one of the conditions for warranty

acknowledgement). Service engineer will also carry out an inspection of the control and safety elements of the

boiler. To safeguard faultless heating system service, it is necessary to regularly check the initial water pressure

in the cold state. Shall any drop in pressure occur, the heating system must be replenished with water.

The outer jacketing can be cleaned by a dishcloth dipped in soap-suds and subsequently dried.

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Thermona THERM EL 15 Seite 22

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