Solar loading switch-over operation

Hydraulic Components	SDC / DHC

to support heating during periods when less solar power is available.

To ensure that the solar tank in priority operation (temperature sensing by the sensor of the solar loading switch-over, usually hot-water tank) can be loaded, checks are performed at regular intervals to determine whether sufficient solar power is available (meaning the solar panel temperature is sufficiently high for loading and the set switch-over temperature can be reached).

Diverter valve This function allows switching of a diverter valve according to the load condition of two heat storage tanks (two-point output) so that solar energy can be used to support heating during periods of low solar intake.

Test cycle If the switch-over condition is not fulfilled after a preset time interval of 30 minutes (meaning the temperature in the first-priority tank remains below the set switch-over temperature) and if the loading conditions for the second-priority tank (temperature sensing by the collector tank/buffer sensor, usually buffer tank for heating support) are fulfilled, the solar loading pump (SOP) is temporarily switched off after the time set in the "Solar" menu, parameter 15. During the switch-off time, the differential between the collector flow sensor (SPFS) and the sensor for solar loading switch-over (SLVF) is determined. If the switch-on condition is fulfilled, the first-priority tank is loaded. If the loading condition is not fulfilled after the set time, loading is continued into the lower priority tank as long as the loading conditions are not fulfilled.

These cyclical checks are suspended if the temperature at the solar loading switch-over sensor plus the switch-on differential becomes greater or equal the set final switch-off temperature.

Only a setting option if a solar loading pump is set on the hydraulic level.

214	EN2H-0221GE51 R0808

EN2H-0221GE51 R0808 specifications

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Honeywell EN2H-0221GE51 R0808 service manual Solar loading switch-over operation

Models: EN2H-0221GE51 R0808

SDC / DHC

Solar loading switch-over operation

EN2H-0221GE51 R0808

EN2H-0221GE51 R0808 specifications