Hydraulic Components

SDC / DHC

 

 

NOTE In this control mode, the loading temperature offset for the tank is to be selected so that the heat generator does not switch off before the heating circuits are enabled. A parallel shift of at least 10 K should be set so that this function can operate correctly.

Parallel operation based on weather conditions

Above the set outside frost protection limit, hot water provision is carried out in priority mode; in case of active frost protection there is a switch-over to parallel mode.

Priority mode with intermediate heating

With this setting hot-water circuit loading is limited to a maximum of 20 minutes in order to provide for a 10-minute long intermediate heating. The loading procedure is continued at the end of the intermediate heating. Hot-water loading and intermediate heating are carried out in an alternating order until hot-water tank loading is finished.

Priority isolating circuit

Hot-water loading is carried by means of a three-way switch-over valve; the heating circuit pump is also the hot-water circuit loading pump. At the end of the hot-water loading and at the expiration of the extended time the three-way switch-over valve is changed back to heating mode.

The heating circuit pump is connected at output direct heating circuit pump and the three-way valve to output tank loading pump in this case.

NOTE If there is no hot-water demand (standby), the valve is switched to the hot-water tank (relay output closed).

External mode (request does not act on heating generator and heating circuit)

In external mode, hot-water loading is switched only according to the set switching differentials. There is no heat demand for the heat generator. There is no tank priority mode for the heating circuits. The parameters boiler parallel shift, tank discharge protection, pump extended running time and boiler start-up protection no longer act on the hot-water loading pump.

Tank discharge protection

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EN2H-0221GE51 R0808

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Honeywell EN2H-0221GE51 R0808 service manual Sdc / Dhc
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EN2H-0221GE51 R0808 specifications

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