Technical data

3130
Plastic pipework
The use of plastic pipework is acceptable. However, some
plastics are permeable to oxygen and must be avoided. Only
pipework with a polymeric barrier should be used. Please
note that the first 600mm of pipework connected to the
boiler must be of copper or steel.
Open vented primary systems
The Greenstar CDi Conventional* series is designed for
connection to an open vented fully pumped heating and hot
water system.
The following points are for guidance only. The system
installation should be carried out in accordance with
BS 5449:Part1.
The feed and expansion pipes must rise continuously from
the appliance and must be of the minimum diameter shown
below.
The cistern must be arranged to provide a minimum static
head of 0.25 metres above the top of the highest point in
the heating circuit.
Air in the appliance is expelled through the vent pipe or
dissipated into the system. Manual air vents should be
fitted at any high points in the system.
*30CDi System not suitable for open vent
Air supply
Worcester Greenstar CDi boilers are room sealed
appliances; the room in which it is installed does not
therefore require a purpose provided combustion air vent.
Natural gas supply
The appliances when on a full output demand will require
up to 3.2m
3
/hr (30kW) or 4.4m
3
/hr (40kW) of gas. 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.
Total length of Pipe diameter
gas supply pipe (m) (mm)
369 –
Gas 2.9 – – 15
discharge
8.7 5.8 4.6 22
rate m
3
/h
18.0 12.0 9.4 28
Elbows or tees
Metres Feet
0.50 2
90º bends
Metres Feet
0.3 1
Approximate additional length to be allowed (natural gas)
F & E
CYL
CT
AAV
MPV
or
DIV
IV HC IV
BC
B
PR
W V
R
LSV
RT
F & EC
CYL
CT
AV
ZV
ZV
ABV
IV HC IV
BC
B
PR
W V
R
LSV
RT
Y plan
S plan
Propane gas supply
The Greenstar CDi series is available in a propane gas
version. The appliance when on a hot water or full output
demand will require up to 2.4kg/h (30kW) or 3.3kg/h
(40kW) of gas. The gas tank or bottles must be capable of
supplying this quantity of gas at a nominal pressure of
37mbar (14.8in wg) at the appliance. The table below
shows the propane gas discharge through varying lengths of
pipe and the resistance to flow created by elbows, bends,
etc. Pipe work should be sized to overcome this resistance.
Electricity supply
A 3amp fused three pin plug and unswitched shuttered
socket outlet (both complying with BS 1362) or preferably a
double pole isolator with a contact separation of 3mm in all
poles supplying the appliance should be used.
The appliance electrical circuits are also protected by an
internal 2amp fuse. The appliance must be earthed.
Warranty
Worcester Greenstar CDi appliances are offered with a full
2 year guarantee* on parts and labour, a 10 year warranty*
on the primary heat exchanger and a 5 year warranty* on
the plate heat exchanger. Ongoing service may be arranged
through the Worcester Customer Service Department.
*Subject to conditions.
Total length of Pipe diameter
gas supply pipe (m) (mm)
369 –
Gas 1.5 1.01 – 15
discharge
8.0 5.2 4.2 22
rate m
3
/h
15.9 8.9 8.3 28
Elbows or tees
Metres Feet
0.6 2
90º bends
Metres Feet
0.3 1
Approximate additional length to be allowed (LPG)
BBT1253 G_CDi Rg+Sys TS c08_07 25/6/07 09:21 Page 30