1.8.3. Circulating pump The circulating pump is controlled via the DDC control. As a result it must be connected via the connection terminals provided in the control panel. During domestic water heating (stratified buffer storage), the circulating pump is switched off by the DDC control. Particular attention must be paid during installation to ensuring that the pump shaft is installed horizontally. The installation regulations of the manufacturers must be followed! The controller output for the recirculation pump is designed for a connected load of 1 A/230 V. If the circulating pump used is more powerful than this, the owner must install a coupling relay in between. The circulating pump is only allowed to be started after it has been filled and bled. Even short periods of dry running can cause damage to the pump. Before the circulating pump is taken into operation, make sure there are no impurities in the transfer station by flushing it with hot water; this is to prevent the circulating pump from blocking after long periods without operation. 1.8.4 Electric circuit diagram All electronic connections of the electrical modules and components used are pre-installed centrally in the control panel on connection terminals. The electrical circuit diagram contained in the product documentation shows the corresponding pin assignments. The electrical circuit diagram illustrates all of the wiring within the control panel. The completed wiring of the DDC controller to the connection terminals of the control panel depends on the particular requirements for the required equipment. If additional connection terminals are required, they can be retrofitted. Electrical connection work must be performed by qualified electricians. 28 Quick reference guide | Standardised heat transfer station
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