INSTALLATION
2.20 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.
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]
Heating slope
2.5 2.2 2.0 1.8 1.6 1.4 1.2 1.0
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).
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