Operation; Control Of Water Temperature - IDEAL Logic+ Combi 24 User Manual

OPERATION

Winter Mode - i.e. CH and DHW required.
Ensure the off/summer/winter control (D) is set to winter ( )
The boiler will fire and supply heat to the radiators but will give priority to DHW on demand.
The DHW preheat will operate as described under 'Summer conditions' during periods when there is no call for CH.
Summer Mode - i.e. DHW only required.
Set the mode knob control to Summer ( ).
Set the CH external controls to OFF.
Preheat will operate with the preheat switch (A) set to ON.
The boiler will fire periodically for a few seconds to maintain the DHW calorifier in a pre-heated condition. The average time
period between firing is 90 minutes. This may vary considerably due to the surrounding ambient temperature of the boiler.
The boiler will fire whenever there is a demand for DHW.
The boiler preheat facility can be immobilised by turning the preheat switch (A) to OFF. This will stop the boiler operating for
short periods. This facility is primarily provided for boiler installations in a sensitive area (i.e. bedroom etc.).
Note. If the pump and diverter valve have not operated in the last 24 hours they will run briefly to ensure they do not become
seized.

CONTROL OF WATER TEMPERATURE

Domestic Hot Water
The DHW temperature is limited by the boiler controls to 64 o C maximum at low draw-off rate, adjustable via the DHW
temperature control (B).
Due to system variations and seasonal temperature fluctuations DHW flow rates/temperature rise will vary, requiring adjustment
at the draw off tap : the lower the rate the higher the temperature, and vice versa.
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