Saunier Duval 47-920-36 Instructions For Use Installation And Servicing page 29

Important: The commissioning and first firing of the boiler must
only be done by a competant person.
Gas installation
If conversion from G20 to 30 or 31 is required, refer to section
15.
It is recommended that any air is purged from the supply at the
gas purge point on the gas valve, see diagram 14.1.
Filling the system
The following steps 1 - 8, show how to fill the system.
1.
Make sure that:
• The boiler is connected to the
electrical supply.
• The gas service cock is open.
Turn the switch OFF ( 0 )
2. • Open the three water isolating valves.
COLD WATER IN
HEATING
(F30E/F35E Only)
RETURN
F30E shown
3. • Undo cap on automatic air vent on top of pump
and leave undone.
14 Commissioning
Air in pipes
Important: A central heating system can not operate correctly
unless it is filled with water and air bled from the system. If these
conditions are not met the system may be noisy.
Bleed the air in the radiators and adjust the pressure if system
requires. If the system requires filling to often this may be due
to minor leaks or corrosion in the system.
Note: Isolating valves are shown in the: OFF position
HEATING
FLOW
4.
• Turn the switch ON ( I )
• F30E/F35E Only Open the tap on the filling
device
• Fill the system until the pressure indicated on
the display is 1 bar. Close filling device.
NOTE: On initial fill there may be a small discharge
of water from the Reduced Pressure Zone valve
29
F30E shown
DOMESTIC HOT GAS SERVICE
WATER OUT COCK
(F30E/F35E Only)
BURNER
PRESSURE
POINT
GAS
PURGE
POINT
Diagram 14.1
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