Technical information

Installation and servicing instructions strictly reserved
for qualified gas installers
33
COMMISSIONING
LPG CONVERSION - 30 HE only
NOTE: Steps 10.1 to 10.3 will need to be completed
before the appliance can be converted.
The 30 HE can be converted to run on
LPG-Propane (G31).
This conversion should only be carried out by a
competent person.
During the conversion to Propane use of a suitable
flue gas analyser is necessary.
As an option a chargeable boiler only commissioning
service can be provided by Saunier Duval Service
by calling telephone No. 01773 525914.
Tools required to make the conversion are a 2mm
Allen key and an electricians screwdriver.
Ensure that the appliance supply pressure =
37mbar.
NOTE: Remove the inner casing panel, see
diagram 10.1.
(1) To access the gas valve. If necessary remove
chassis front for extra access. See diagram
11.3
(2) Refer to diagram 10.3 and turn the gas valve
throttle fully clockwise.
(3) Turn the throttle back anti-clockwise by 5
1/2 turns.
(4) Ensure that the gas analyser is set to the
correct fuel setting - Propane.
(5) Attach combustion analyser to the combustion
test point. See diagram 11.6.
(6) Unclip the controls fascia to reveal the service
potentiometer on the rear of the user interface.
See diagram 11.7.
(7) Turn on the mains electrical supply and turn
on the gas service cock. Switch the boiler on.
(8) Ensure external controls are calling for heat.
The boiler should fire automatically.
(9) Using an electrical screwdriver, rotate the
service potentiometer to the mid point or 3 o’clock
position. See diagram 11.7. The fan speed should
now reduce to minimum and ‘12’ should be shown
flashing on the digital display. Check the CO2 value.
If necessary refer to diagram 10.3 and using a
2mm allen key carefully adjust the offset screw
until a CO2 reading of 10.5% ± 0.2% is achieved.
Turning the offset screw clockwise increases the
CO2 reading.
(10) After setting combustion, rotate the service
potentiometer fully anti-clockwise so that the
display indicates the water temperature. Check
that the CO2 combustion remains between 9.8%
and 10.8% CO2. If it does not, carefully adjust the
gas valve throttle (see diagram 10.3) until this is
achieved.
(11) Remove analyser probe from the test point
and replace the cap. Refit the control panel.
(12) Fit the LPG conversion label supplied in
the documentation pack to the inner front panel
alongside the data label. Refit the inner door and
outer door.
10.1 Preliminaries - All Systems
Remove inner casing panel, see diagram 10.1.
A competent person in accordance with
the current issue of BS6798 should carry out
commissioning.
Make sure that the system has been thoroughly
flushed out with cold water.
Refill the system with water, making sure that all
the air is properly vented from the system and
pump, diagram 10.2 shows vent point.
Before operating the boiler check that all external
controls are calling for heat.
10.2 Sealed Systems
Fill the system until the pressure gauge registers
the recommended pressure. Clear any air locks
and check for leaks.