Hydraulic Components

SDC / DHC

 

 

Buffer siphon function Whenever the buffer tank is not being loaded by the heat generator (buffer setpoint reached) the differential between the heat generator temperature and the buffer tank temperature is measured continuously if configured to do so. The buffer loading pump is switched on as soon as the temperature differential rises above the set extended running switch-on differential. The buffer loading pump is switched off immediately when the temperature differential drops to the extended running switch-off differential.

This siphon function ensures that excess energy in the heat generator (e.g. due to extended heating) will not be lost.

Buffer start-upWhen operating a heating system without buffers, boiler start-up protection protection is generally implemented via temporary separation of

the energy consumers from the heat generator (switch-off of pumps, close mixed heating circuits).

With buffer operation, there is no start-up protection for the heat generator acting on the heating circuits. The start-up protection only acts on the buffer loading pump. If the buffer minimum temperature is undershot when the buffer start-up protection is switched on, all consumer circuits (heating circuits, hot water) are separated on the water side (pumps switch off). The buffer start- up protection is disabled (pumps are switched on again) when the buffer temperature exceeds the buffer minimum temperature plus half of the buffer switching differential. All consumer circuits remain in operation when buffer start-up protection is switched off.

With operation in conjunction with buffer tanks, the hydraulic conditions for each buffer control mode deviate from this. Special considerations must be made regarding boiler start-up protection for this reason.

Buffer start-up protection can be switched off.

Buffer discharge Buffer discharge protection disables the buffer loading pump until protection the heat generator temperature has risen to more than 5 K above

the buffer setpoint temperature.

This function helps prevent rear buffer discharge though the heat generator. The buffer loading pump is disabled again as soon as the temperature differential between the heat generator and the buffer tank has dropped to less than 2 K.

For operation without buffer tanks, tank discharge protection ("Hot Water" menu, parameter 08) acts on the heat generator. The heat generator sensor and the hot-water circuit sensor are compared.

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

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