SDC / DHC

Hydraulic Components

 

 

Boiler circuit pump pre- The pre-running time determines the switch-on delay of the running time burner and thus the pre-running time of the respective shut-off

device used (motor valve, motor throttle) to ensure trouble-free circulation within the heat generator when switching on the burner.

The setting of a pre-running time is only relevant if a shut-off device (e.g. motor throttle) is used instead of a boiler circuit pump at a variable output. Actuators with reversible motors must be operated via an auxiliary relay with a switch-over contact (separate control phases Lopen/Lclosed).

Boiler circuit pump When the burner switches off, a boiler circuit pump is switched off extended running time after a delay based on the set time to prevent a safety switch-off

of the heat generator at high temperatures.

The extended running time depends on the type of heat exchanger used and is to be adapted accordingly.

NOTE An external heat generator disable affects the output of the boiler circuit pump.

7.2.17Return increase

Function To prevent the return flow temperature from dropping below the minimum return temperature required by some heat generators, the control system features various options for raising the return temperature. Once one of these return control options is active, a menu is activated where the appropriate settings can be entered.

The parameter minimum return limit determines the lowest allowable return flow temperature for systems with direct or indirect return control. When the heat generator return temperature drops below the set limit, the respective return control device is activated and raises the return temperature until the set temperature is reached or exceeded.

See also 5.4.8 "Return increase" menu (RETURN CONTR), Pg. 105

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Honeywell EN2H-0221GE51 R0808 service manual Return increase
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EN2H-0221GE51 R0808 specifications

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