Honeywell EN2H-0221GE51 R0808 service manual Solar/Solid fuel/Buffer Solar function

Hydraulic Components SDC / DHC

7.3.6Solar/Solid fuel/Buffer

7.3.6.1Solar function

Function The solar function makes it possible to combine solar power systems with heating and hot-water production systems in order to support the economy of the system. The solar loading pump can be controlled according to various switching conditions.

NOTE This function can only be called up, if a configurable switching output was occupied with a solar loading pump.

Two separate sensor inputs are available for the connection of the sensors:

•KVLF for the solar collector sensor

•KSPF for the collector tank sensor

NOTE

Solar switch-on differential

For heat metering, an optional collector return sensor (KRLF) can be connected via a variable input (VI1 - VI3).

The solar loading pump is disabled if the collector flow sensor is defective.

(switching differential ON)

With sufficient solar heat energy, the temperature differential between collector flow and tank will become bigger than the set value and the solar loading pump is switched on to load the buffer tank. The minimum set value is 3 K above the switch-off differential.

Solar switch-off differential

(switching differential OFF)

If the temperature differential between the collector flow and tank falls below or equal to the set value, the solar loading pump is switched off and loading terminated. The maximum set value is always 3 K below the selected switch-on differential.

Minimum runtime of The activated solar loading pump remains in operation for this set solar loading pump time. The minimum runtime has priority over the switch-off

(SOP) differential (switching differential OFF).

Collector maximum This limit is used for thermal protection of the collector and causes temperature limit forced switch-on of the solar loading pump if the set value is

exceeded. If the temperature drops below the set value –5 K, all solar functions become active again based on their settings.

196 EN2H-0221GE51 R0808