Bedienungsanleitung Sorel MTDC (Seite 17 von 33) (Englisch)

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The priority for the first storage is thus set under priority S2 and for the 2. storage under priority S3.

Tmax Pool / Tmax Pool HE

Switch-off temperature at heat exchanger sensor. If this value is exceeded at the specified sensor, the controller turn off the affiliated

pump or the valve. If this value on the sensor is undershot and the other conditions are fulfilled, the controller will turn on the pump or

the valve.

Temperature values which are set too high can lead to scalding or damage to the system. Scalding protection must be

provided by the customer!

Priority temperature

Temperature threshold for absolute priority charge. In systems with two storage tanks charging of the lower-priority storage tank will

never take place until this temperature at sensor of the higher-priority storage tank is exceeded.

Loading time

Interruption of charging into the lower priority storage. The charging of the lower-priority storage is interrupted after the settable time in

order to check whether the collector has reached a temperature level that allows charging in the higher- priority storage. If so, the pri-

ority storage tank is charged. If not, the increase is measured (See " Increase " on page 17), to check if charging of the priority storage

will be possible shortly.

Increase

Extension of the charging pause due to temperature increase. For precise setting of the charging priorities for systems with multiple

storage tanks, the necessary temperature increase of the collector at which the interruption of the charging into the lower-priority stor-

age tank is extended by one minute is set here. The interruption is extended because the temperature increase of the collector is

expected to enable charging in the higher-priority storage tank soon. As soon as ΔT conditions are met, the priority storage tank is

charged.

If the rise in temperature falls below the set value, then the charging of the lower-priority storage tank is enabled again.

5. Protective Functions

The 'Protective functions‘ can be used by specialists to activate and set various

protective functions.

By no means does the controller replace the safety appliances on site!

System protection

Priority protection function

The system protection should prevent an overheating of the components installed in the system through the forced shut down of the

solar circulation pump. If the value “AS Ton” on the collector has been exceeded for 1 Min. the pump will be turned off and not turn on

again in order to protect the collector, for example, from steam. The pump will only be switched on again, when the collector tem-

perature falls below “SP Toff”.

With the system protection (on), there are increased standstill temperatures in the solar collector and therefore an increased

pressure in the system. The operating manuals from the system components must be observed.

Collector protection

Priority protection function

The collector protection prevents the collector from overheating. A forced switching of the pump makes sure that the collector is cooled

through the storage. If the value “KS Ton” is exceeded on the collector, the pump will be turned on in order to cool the collector. The

pump is shut down if the value “KS Toff” on the collector is not met or the value “KS Tmax Sp.” on the storage is exceeded.

System protection has priority over collector protection! Even if the switch requirements for the collector protection are

present, the solar circulation pump is turned off once “AS T on” is reached. Normally the values from the system protection

(depending on the maximum temperature of the storage or other components) are higher than the collector protection.

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Sorel MTDC Seite 17

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