Technical data

1918
Option 3
VERTICAL BALANCED FLUE SYSTEM WITH TWO
90° BENDS
Flue Components Required
25CDi
30CDi
35CDi
40CDi
Maximum total straight flue length
100mm 125mm
25CDi 7,500mm 19,000mm
30CDi 5,400mm 14,500mm
35CDi 4,000mm 12,000mm
40CDi N/A 12,000mm
Flue Diameter Description Quantity Worcester Part No.
100mm Vertical Flue Kit 1 7 719 002 430
100mm Extension Flue Kit up to 9 7 719 002 349
100mm 90˚ Elbow 2 7 719 002 348
125mm Vertical Flue Kit 1 7 719 002 431
125mm Extension Flue Kit up to 20 7 719 001 892
125mm 90˚ Elbow 2 7 719 001 899
Flue Diameter Description Quantity Worcester Part No.
100mm Vertical Flue Kit 1 7 719 002 430
100mm Extension Flue Kit up to 7 7 719 002 349
100mm 90˚ Elbow 2 7 719 002 348
125mm Vertical Flue Kit 1 7 719 002 431
125mm Extension Flue Kit up to 16 7 719 001 892
125mm 90˚ Elbow 2 7 719 001 899
Flue Diameter Description Quantity Worcester Part No.
100mm Vertical Flue Kit 1 7 719 002 430
100mm Extension Flue Kit up to 5 7 719 002 349
100mm 90˚ Elbow 2 7 719 002 348
125mm Vertical Flue Kit 1 7 719 002 431
125mm Extension Flue Kit up to 13 7 719 001 892
125mm 90˚ Elbow 2 7 719 001 899
Flue Diameter Description Quantity Worcester Part No.
125mm Vertical Flue Kit 1 7 719 002 431
125mm Extension Flue Kit up to 13 7 719 001 892
125mm 90˚ Elbow 2 7 719 001 899
Installation requirements
Installation of the Greenstar CDi Series must be in accordance with
the relevant requirements of the Gas Safety (Installation Use)
Regulations (as amended), current IEE Wiring Regulations, local
Building Regulations, Building Standards (Scotland) (Consolidation)
regulations and bylaws of the local Water company and Health and
Safety Document No. 635 (Electricity at Work Regulations 1989).
It should be in accordance with the relevant recommendations of
the following British Standards:
BS 6798; BS 5449; BS 5546:1; BS 5440:1; BS 5440:2;
BS 6891.
Gas Safety (Installation and Use) Regulations. All gas appliances
must be installed by a Corgi registered person in accordance with
the above regulations. Failure to install appliances correctly could
lead to prosecution.
The manufacturers notes must not be taken in any way as
overriding statutory regulations.
Sealed primary systems
Worcester Greenstar CDi combi boilers are supplied complete with
all the necessary components to form a sealed primary system.
Included are a pre-plumbed expansion vessel, a pressure relief valve
(set at 3bar), an automatic air vent and a pressure gauge.
With an initial system pressure of 0.5bar a system capacity
of approximately 83 litres can be accommodated. Refer to
BS 7074:Part 1 for more information. The charge pressure can
be increased by with a decrease in system volume.
It is important with an Aluminium Heat Exchanger that the pH level
of the water does not exceed 8. Levels in excess of this could be
detrimental to the Heat Exchanger.
The use of a suitable inhibitor will provide a resistance to this.
Contact Betz Dearborn (Tel: [phone]) or
Fernox (Tel: [phone]) for further details.
System filling and make-up
The supplied plug in filling loop simply
connects between the cold main
connection and the heating return
circuit on the wall mounting jig.
Valves and joints
It is very important that all valves and joints are able to sustain a
working pressure of up to 3bar (45psi). Particular care should be
exercised when fitting radiator valves and only those of high quality
to BS 2767:10 should be used. All other valves and fittings should
comply with BS 1010.
Loss of water pressure from a sealed system will require continuous
recharging with fresh water and consequential introduction of air. Air
is highly corrosive and will considerably reduce life expectancy of
radiators, pumps etc.
Plastic pipe work
The use of plastic pipe work is acceptable. However, some plastics
are permeable to oxygen and must be avoided. Only pipe work with
a polymeric barrier should be used. Please note that the first
600mm of pipe work connected to the boiler must be of copper
or steel.
Natural gas supply
The appliances when on a hot water or full output demand will
require up to 2.6m
3
/hr of gas (25kW). The gas meter and supply
pipes must be capable of supplying this quantity of gas in addition
to the demand from any other appliance being served. It is
important that a gas supply pipe of at least 22mm diameter is
used. Under no circumstances should the size of the gas supply
pipe be less than that of the appliance inlet connection. The meter
outlet governor should be capable of ensuring a dynamic pressure
of 20mbar (8in wg) at the appliance. Particular consideration should
be given to the resistance to gas flow created by elbows, bends
etc. Pipe work should be sized to overcome this resistance and
details of this are given in the table below.
Approximate Additional Length to be Allowed (Natural gas)
Elbows or Tees 90º Bends
Metres Feet Metres Feet
0.5 2 0.3 1
369
2.9 – – 15
8.7 5.8 4.6 22
18.0 12.0 9.4 28
Total length of Gas Supply Pipe (metres)
Pipe
Diameter
(mm)
Gas Discharge
Rate m
3
/h
BBT180 Gstar CDi T&S Iss B 4/5/06 12:50 Page 18