Technical data

2120
Installation requirements continued
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.
Approximate Additional Length to be Allowed (LPG)
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. Ongoing service may be arranged
through the Worcester Customer Service Department.
*Subject to conditions.
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
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
369
1.5 1.01 – 15
8.0 5.2 4.2 22
15.9 8.9 8.3 28
Total length of Gas Supply Pipe (metres)
Pipe
Diameter
(mm)
Gas Discharge
Rate m
3
/h
Elbows or Tees 90º Bends
Metres Feet Metres Feet
0.6 2 0.3 1
Y plan
S plan
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.
Approximate Additional Length to be Allowed (Natural Gas)
BBT181 Gstr CDi Conv T&S IssB 4/5/06 11:21 Page 20