Ideal Boilers Logic+ Combi 24 User Manual

Contents

5OPERATION MODESWinter Conditions - (Central Heating and Domestic Hot Waterrequired)Set the mode knob (D) ‘ ’ (winter).The boiler will fire and supply heat to the radiators but willgive priority to domestic hot water on demand.The domestic hot water preheat will operate with the preheatknob (A) set to ‘preheat on’.Summer Conditions - (Domestic Hot Water only required)Set the mode knob (D) to ‘ ’ (summer).Set the central heating demand on the external controls to OFF.The domestic hot water preheat will operate with the preheatknob (A) set to ‘preheat on’.Boiler OffSet the mode knob (D) to ‘boiler off’. The boiler mains power supplymust be left on to enable frost protection (see Frost Protection).PREHEAT - DOMESTIC HOT WATERThe domestic hot water heat exchanger within the boiler canbe kept preheated to provide faster delivery of hot water at thetap. This is achieved by turning the ‘preheat on/off’ knob (A)to ‘preheat on’.The boiler will operate periodically for a few seconds tomaintain the domestic hot water heat exchanger in a preheatedcondition. The average time period between operation is 90minutes. This may vary considerably due to the surroundingambient temperature of the boiler. The boiler will operatewhenever there is a demand for domestic hot water.If standard hot water delivery is satisfactory turn the knob (A)to ‘preheat off’.CONTROL OF WATER TEMPERATUREDomestic Hot WaterThe domestic hot water temperature is limited by the boilercontrols to a maximum temperature of 64 ºC, adjustable viathe domestic hot water temperature knob (B).Approximate temperatures for domestic hot water:Knob Setting Hot Water Temperature (approx.)Minimum 40ºC (104ºF)Maximum 64ºC (147ºF)Due to system variations and seasonal temperaturefluctuations domestic hot water flow rates/temperature risewill vary, requiring adjustment at the tap : the lower the flowrate the higher the temperature, and vice versa.Central HeatingThe boiler controls the central heating radiator temperatureto a maximum of 80 oC, adjustable via the central heatingtemperature knob (C).Approximate temperatures for central heating:Knob Setting Central Heating Radiator Temperature (approx.)Minimum 45ºC (113ºF)Maximum 80ºC (176ºF)For economy setting ‘ ’ refer to Efficient Heating SystemOperation.