System Filling
The appliance is designed for connection to sealed central
heating water systems. Fig 6 shows a typical system
design.
A sealed system must only be fitted by a competent person
using one of the approved methods shown in Fig. 6 (A or B).
The system should incorporate the connections appropriate
to one of these methods.
METHOD OF MAKEUP:
Water loss from the system should be replaced from a
makeup vessel connected to the system through a non
return valve on the return side of the heating circuit. This
vessel should be higher than the top of the system.
Alternatively provision for makeup can be made by
pre-pressurisation of the system via a temporary hose
connection and through a double check valve (non return)
and stop valve.
FILLING:
There shall be no direct connection to the mains water
supply, even though a non return water valve, without the
approval of the Local Water Authority.
System Cleaning and Inhibitor Treatment Before commis-
sioning the appliance it is essential to clean the installation
in accordance with the procedure set out in BS 7593. This
involves the application of a cleanser, and allowing it to
circulate around the whole system for a specified time,
then flushing to drain. It is important to select the cleanser
appropriate to the situation, i.e. for a new installation, or for
an existing system where the boiler is being replaced. In
the case of boiler replacement, it is good practice to clean
the system prior to the installation of the new boiler.
It is recommended that an inhibitor is added to protect the
system. The Inhibitor should be added at the time of
the final fill, in accordance with the manufacturer’s instructions.
Domestic Hot Water
The mains supply pressure should be between 1 and 5 bar
but if in excess of 5 bar, then a pressure reducing valve
must be fitted before the inlet valve. The final 600mm
(24in) of the mains water supply pipe to the boiler must be
copper. If the appliance is installed in an area where the
temporary hardness of the water supply is high, say over
150 ppm. A water softener (salt based) must be fitted.
Consult the Local Water Authority if in doubt.
For specific information relating to fittings (e.g. showers,
washing machines, etc.) suitable connection in the DHW
circuit, consult the Local Water Authority if in doubt.
DOMESTIC HOT/COLD WATER SUPPLY TAPS AND
MIXING TAPS:
All equipment designed for use at mains are suitable.
SHOWERS AND BIDETS:
Any mains pressure shower or bidet complying with the
Local Water Authority byelaws are suitable.
Water System Connections
Heating
Connect the appliance to the water system using the two
stop valves
supplied (copper compression fittings 22mm).
The flow connection is on the right.
Using not less than 15mm copper pipe work, the pressure
relief valve must be piped to the tundish, in accordance
with details given in fig. 12 and section G3 of the Building
Regulations 1991 approved document.
NOTE: Failure to ensure the correct vessel size
could result in premature failure of the expan-
sion vessel, which in turn may adversely affect
other components on the boiler ie circulating
pump and diverter valve.
Domestic Hot Water
Connect the incoming cold water using the ball valve
supplied (copper compression fitting 15mm).
Connect the DHW flow to the hot water system (copper
compression fitting 15mm).
10
Summary of Contents for Combi 50 ECO
Page 10: ...7 Fig 2...
Page 14: ...11 Fig 4 EUROSTAR COMBI SCHEMATIC LAYOUT Fig 5 SEALED SYSTEM PIPING SCHEMATIC DIAGRAM...
Page 20: ...17 Fig 11 SINGLE PIPE OIL SUPPLY HEAD H METRES...
Page 21: ...18 Fig 12 TWO PIPE OIL SUPPLY...
Page 22: ...19 Fig 13 DE AERATED OIL SUPPLY INSTALLATION...
Page 32: ...29 Fig 20 2273 VERTICAL B F KIT 2273 Vertical Balanced Flue Kit 600mm 24 3000mm MAX 118...