SDC / DHC

Hydraulic Components

 

 

Loading control

The supply of energy from a controlled heat generator to the heating circuits is realised through loading the buffer. The buffer control ensures that the buffer is supplied with sufficient energy from the heat generator, via the buffer loading pump.

With buffer discharge controls, it must be ensured that the residual energy from the buffer can be transported to the heating circuits if a controlled heat generator is not available. With control mode 3 and 4, the buffer loading pump output must be switched for this purpose in this case. With control mode 6, only the burner demand is suppressed with a heat generator disable.

If a heat generator is not available and the actual buffer temperature is below the minimum buffer temperature while buffer start-up protection is active, the buffer loading pump output remains switched off (priority).

A heat generator is not available if:

•An external heat generator disable is active at a variable input

•Heat generator cycle disable is active via configuration in the "Solid Fuel" menu, parameter 05

•Heat generator cycle disable is active via configuration in the "Solar" menu, parameter 07

•A heat generator is not present in the system (e.g. purely solid fuel buffer combinations)

Discharge control 1

The heating circuits are supplied with energy either from the buffer through discharging the buffer tank via buffer loading pump, provided the buffer tank contains sufficient energy, or through direct supply from the heat generator.

NOTE If a heat generator disable is active (e.g. through external burner disabling via contact, cycle disable (solid fuel/solar)), the energy contained in the buffer, independent of the current buffer level, is dissipated into the heating circuits by enabling the buffer discharge channel (e.g. switching on the buffer loading pump or switching over the buffer loading pump valve). The buffer minimum temperature is monitored. Hot-water loading is enabled under the conditions of buffer/tank discharge protection.

EN2H-0221GE51 R0808

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Honeywell EN2H-0221GE51 R0808 service manual Loading control, Discharge control
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EN2H-0221GE51 R0808 specifications

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