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Table of Contents

WD265/0/2002

Chapter 1 : General Instruction

the flueway and is drained at the base of the flue connection to the heat exchanger or

drain points within the flue.

Fig. 1.2 - Boiler Layout

The condensate is very slightly acidic (about the same acidity as vinegar) and should be

piped in a plastic pipe. It is not harmful to the waste disposal system and may be disposed

of as normal waste water.

The flue gases are piped in a 50 mm muPVC (BS5255 and/or BSEN1566-1 and

BSEN1329) plastic or, alternatively, 75mm composite plastic pipe to the outside. The

temperature of the flue gases are usually around 5

the return water. The flue pipe should be terminated outside the building from where they

cannot re-enter the building or any other adjacent building.

The heating level may be controlled by room thermostats, hot water calorifier thermostats,

programmer time clocks and energy management systems. A Keston room controller can

be connected which will provide enhance controls such as room compensation and

optimum start to further increase efficiency and comfort levels.

The C40 and C55 feature an integral frost protection function which will operate the pump,

regardless of the external controls, should the boiler temperature fall below 7

event the boiler temperature falls below 3

damage to the boiler through freezing of boiler water. The boiler will turn off when the flow

temperature exceeds 10

The C40 and C55 feature an integral pump exercise function which will run the pump,

without firing the boiler, for 10 seconds in the event the boiler is on standby for in excess

of 24 hours without firing. This is to help prevent seizing of the pump due to long periods

of inactivity.

1.3

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