3) Terminate in an approved terminal preferably above ridge height but at least above the eaves of
a pitched roof.
4) If Twinwall type flue tubing is to be used the inner tubing of the boiler adaptor must not project
into the draught diverter of the boiler. A boiler adaptor which meets this requirement is obtainable.
5) An existing brick chimney should be lined with acid and moisture resistant materials such as
stainless steel flexible flue pipe. This is particularly important if the flue is above 6.5 metres (20 ft)
in height and not wholly internal. WHETHER OR NOT THE CHIMNEY IS TO BE LINED IT MUST
BE SWEPT THOROUGHLY BEFORE THE INSTALLATION.
6) Whatever type of flue is used it must be properly supported and not simply supported on the
boiler.
Page 3
WATER CIRCULATION SYSTEMS
(see pages 8 & 9)
The appliances are only suitable for connection to a cistern supply and can be used with:
1) Pumped domestic hot water and pumped central heating systems.
2) Gravity flow domestic hot water and pumped central heating systems.
(a) With 28mm pipes the minimum circulating head for gravity domestic hot water should not be
less than 1 metre (3 ft 3 in) measured vertically from the flow connection on the boiler to the flow
connection on the cylinder. At this head, the maximum horizontal distance measured along the run
of the pipe should not exceed 3 metres (10ft). Greater horizontal distances and smaller pipe sizes
are acceptable with suitably increased heads. Allowances must be made for pipe bends where
necessary.
(b) If the above conditions are not easily met then pumped primaries should be used.
(c) Gravity flow and return pipes should be laid to maximum fall to avoid air locks.
The following points are of particular importance:
1) THE WATER SPREADER MUST BE FITTED TO THE PUMPED RETURN CONNECTION ON
ALL SYSTEMS.
2) The appliances must not be used on sealed systems.
3) The system must be designed to avoid reverse circulation.
4) The static head must not exceed 30 metres (100ft) of water.
5) The boilers must only be used with an indirect cylinder when domestic hot water is required.
6) Drain points should be fitted at the lowest points in the system.
7) The system must be designed such that gravity circulation in the heating system does not take
place when the pump is not running.
GAS SUPPLY
The gas connection is located at the bottom left hand side of the appliance and is RC1/2 (1/2 in
B.S.P.T. internal). Ensure that the pipework from the meter to the appliance is of adequate size. Do
Summary of Contents for BOSTON 40 OF
Page 9: ...fig 1 Pump in Casing Page 5 fig 2 Outer Case ...
Page 15: ...Page 8 Fig A One Zone Valve Fully Pumped System ...
Page 16: ...Fig B Sundial Gravity System ...
Page 17: ...Fig C 2 Zones Valve Fully Pumped System ...
Page 20: ...fig 7 Burner Controls fig 8 Boiler Thermostat Page 10 ...
Page 23: ...Fig 9 Insulation Combustion Box Door Fig 10 Baffle Securing Screws ...
Page 24: ...fig 11 Door Burner 60 50 40 fig 12 Door Burner 80 70 ...
Page 29: ...fig 16 Insulation Page 14 Short Parts List ...
Page 30: ......
