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4
Description of the product
4.1
General description
Fig.5
Information label
A
4.2
Operating principle
The Potterton Assure Combi range are fully automatic gas fired wall moun
ted condensing boilers. They are room sealed and fan assisted and will
serve central heating and mains fed domestic hot water.
Tab.15
The boiler is set to give a maximum output of :-
25 models
30 models
36 models
The boiler is factory set for use on Natural Gas (G20).
The boiler is suitable for use only on fully pumped sealed heating systems.
Priority is given to domestic hot water.
An information label giving details of the model, serial number and Gas
Council number is situated on the front middle underside of the outercase
and is accessed by swinging forward gently.
A
Information label
The boiler data badge is positioned on the control box and can be seen
when the outercase panel is removed.
PN-0000368
The boiler is intended to be installed in residential / domestic environments
on a governed meter supply only.
The boiler must be installed with one of the purpose designed flues such
as one of the standard horizontal telescopic flue kits detailed in the Flue
Accessories and Fitting Guide.
Important
All systems must be thoroughly cleansed, flushed and treated with
inhibitor.
Note
These installation and servicing instructions must be read in con
junction with the Flue Accessories and Fitting Guide supplied in
the literature pack.
4.2.1
Air-gas adjustment
The air is drawn in by the fan and gas injected directly at the top of the
mixer valve. The fan rotation speed is regulated automatically by the elec
tronic board based on temperature adjustment and other parameters. The
gas and air are mixed in the manifold. The gas/air ratio ensures that the
quantity of gas and air are adjusted correctly to always obtain optimal
combustion. The gas/air mixture is fed into the burner at the front of the
heat exchanger. The mixture is ignited by the spark electrode.
4.2.2
Combustion
The burner heats the heating water circulating in the heat exchanger.
When the temperature of the combustion gas is lower than the dew point
(around 55 °C), the water vapour contained in the combustion gas con
denses in the flue gas side of the heat exchanger. The heat recovered
during this condensation process (the latent heat or condensing heat) is
also transferred to the heating water. Once cooled, the combustion gases
are discharged through the flue exhaust. The condensed water is dis
charged through a trap.
4 Description of the product
25 kW DHW
21.16 kW CH Pnc (Condensing)
30 kW DHW
26.33 kW CH Pnc (Condensing)
36 kW DHW
26.33 kW CH Pnc (Condensing)
19
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