IMPORTANT:
The dimensions of the flues must be determined by the flue supplier.
IMPORTANT:
The storage unit's connection part must not be made to support the
exhaust duct's weight.
IMPORTANT:
Installation of an air filter (ref. HAMWORTHY Kit for Dorchester DR-SG
XX-210: 031303, Dorchester DR-SG XX-356: 031304, Dorchester DR-
SG XX-538: 031305) is strongly recommended to protect the burner
tube from clogging. This clogging can cause ignition errors (E133)
or flame failure during operation (E128). Cleaning the tube is usually
enough to resolve safety shut-downs.
The size of the chimney pipes must be determined by taking account of
combustion gas pressure on the water heater's output equal to 0 Pa (see
table § 3.3).
The flue ducts must be made in a material resistant to the condensate
that can form when the boiler is operating.
These materials must also be
capable of supporting flue gas temperatures up to 120°C. Horizontal duct
runs must be avoided so as to limit condensate retention.
The heater is designed to be fired into a flue with a balanced draught
condition (0PA). If suction conditions exceed this it is permitted to
install a suitable druaght stabiliser, specialist advice from a flue
specialist should be sought if required.
Check that the combustion gas is evacuated via the suitable and approved
pipe flue pipe system.
Dorchester DR-SG appliances are high performance water heaters with
very low exhaust temperatures; consequently to retain a favourable
draft the ducts must run upwards from the storage tank outlet.
figure 5 - B23 type connection
WARNING:
If several water heaters are connected to one flue, check by calculation
that the flue is not pressurised when all the boilers are operating at
Qn.
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DORCHESTER DR-SG -
Installation, Operation and Maintenance