28
CH OPERATION
The On and Off time control of central heating should be controlled by a separate timer. This can be a standard unit or either of
the options available from Keston Combi range.
During programmed On times the Central Heating Radiator Flow Temperature is controlled by the boiler relative to the Outside
Temperature as shown in the following diagram.
The Room temperature can be adjusted using the Central Heating Temperature Control Knob on the boiler as follows.
Essentially rotating the knob clockwise increases the room temperature and rotating the knob anti-clockwise decreases the room
temperature.
If the Central Heating Temperature Control Knob is rotated fully clockwise then for an Outside Temperature of 15°C a Flow
Temperature of 40°C will be provided. For an Outside Temperature of 0°C a Flow Temperature of 78°C will be provided with the
relationship varying lineally in between these 2 points (line on the graph 2.5)
If the Central Heating Temperature Control Knob is in its mid position then for an Outside Temperature of 15°C a Flow
Temperature of 36°C will be provided. For an Outside Temperature of 0°C a Flow Temperature of 65°C will be provided with the
relationship varying lineally in between these 2 points (line on the graph between 1.6 and 1.8)
If the Central Heating Temperature Control Knob is rotated fully anti-clockwise then for an Outside Temperature of 15°C a Flow
Temperature of 30°C will be provided. For an Outside Temperature of 0°C a Flow Temperature of 44°C will be provided with the
relationship varying lineally in between these 2 points (line on the graph 1.0)
20 10 0 -10 -20 -30 -40
30
20
40
50
60
70
80
90
100
Weather Compensation Control / Room Setpoint = +20ºC
Outside Temperature [ºC]
CH Temperature Setpoint [C]
Heating slope
2.5 2.2 2.0 1.8 1.6 1.4 1.2 1.0
INSTALLATION
207895-2.indd 28 02/01/2013 09:38:29
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