SDC / DHC

Hydraulic Components

 

 

Separate start-up protection for heat generator and heating circuits

This function allows separation of the temperatures for switching on the burner and switching off the heating circuit when the boiler temperature falls below the boiler minimum temperature limit.

See also 5.2.4 "DHW" menu, pg. 77

7.1.2Heat generator minimum temperature limit

Function To protect the heat generator from condensation formation, the minimum temperature limit specified by the heat generator manufacturer is to be set.

The heat generator switches on when the temperature falls below the set value, while it switches off when the set value plus the burner switching differential is exceeded. During heating, the set limit value is not undershot.

The setting of this parameter is used solely for the response of the heat generator (burner) to the set minimum temperature

( KTmin−WEZ ). The function for the heat generator remains unchanged.

The mode of operation of the set limit is defined via the "Heat

Generator" menu, heat generator start-up protection parameter.

There are three different modes of operation for the minimum temperature limit:

Minimum limit based on demand

As long as there is no demand from heating or hot water, the boiler remains switched off. The minimum limit is disabled. The burner is switched on and the heat generator is heated up to the set minimum temperature limit as soon as the temperature in the heat generator drops below the fixed heat generator frost protection temperature of +5°C.

Conditional minimum limit

The boiler minimum temperature acts as the lower limit, which will be maintained even if there is no demand. The boiler is switched off only if summer switch-off is active.

Unlimited minimum limit

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Honeywell EN2H-0221GE51 R0808 service manual Heat generator minimum temperature limit, Minimum limit based on demand
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