IDEAL Logic+ Combi C24 - Page 5

5
OPERATION MODES
Winter Conditions -
(Central Heating and Domestic Hot Water
required)
Set the mode knob (C) ‘ ’ (winter).
The boiler will re and supply heat to the radiators.
The domestic hot water preheat will operate with the preheat
button set to ‘Preheat On’.
Summer Conditions - (Domestic Hot Water only required)
Set the mode knob (C) to ‘
’ (summer).
Set the central heating demand on the external controls to OFF.
The domestic hot water preheat will operate with the preheat
button set to ‘Hot Water On’.
Boiler Off
Set the mode knob (C) to ‘BOILER OFF’. The boiler mains power
supply must be left on to enable frost protection (see Frost Protection).
PREHEAT - DOMESTIC HOT WATER
The domestic hot water heat exchanger within the boiler can be
kept preheated to provide faster delivery of hot water at the tap.
This is achieved by pressing the preheat button to “Preheat On”.
The boiler will operate periodically for a few seconds to
maintain the domestic hot water heat exchanger in a preheated
condition. The average time period between operation is 90
minutes. This may vary considerably due to the surrounding
ambient temperature of the boiler. The boiler will operate
whenever there is a demand for domestic hot water.
If standard hot water delivery is satisfactory set the preheat to
‘Preheat Off’.
CONTROL OF WATER TEMPERATURE
Domestic Hot Water
The domestic hot water temperature is limited by the boiler
controls to a maximum temperature of 65
º
C, adjustable via
the domestic hot water temperature knob (B). At low DHW
draw off rates the maximum temperature may exceed 65ºC.
Approximate temperatures for domestic hot water:
Knob Setting Hot Water Temperature (approx.)
Minimum 40ºC
Maximum 65ºC
Due to system variations and seasonal temperature
uctuations domestic hot water ow rates/temperature rise
will vary, requiring adjustment at the tap : the lower the ow
rate the higher the temperature, and vice versa.
Central Heating
The boiler controls the central heating radiator temperature
to a maximum of 80
o
C, adjustable via the central heating
temperature knob (B).
Approximate temperatures for central heating:
Knob Setting Central Heating Radiator Temperature (approx.)
Minimum 30ºC
Maximum 80ºC
For economy setting ‘
’ refer to Efcient Heating System
Operation.