Saunier Duval Ecosy 2 SB 28E User manual

0020096286
GAS VALVE (HONEYWELL)
MODEL
Ecosy SB 28E
Ecosy 28E
KIT Pt. No. 05632900
incl.
1 off “O” ring
4 off screws
MODEL
Ecosy 24E
Ecosy SB 24E
KIT Pt. No. 05617100
IMPORTANT NOTE
THESE INSTRUCTIONS SUPERCEDE
THE GAS VALVE SETTING PROCEDURE CONTAINED
WITHIN THE ORIGINAL APPLIANCE LITERATURE.

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Requirements
It is the Law that any replacement of parts is carried out
by a competent person approved at the time by the Health
and Safety Executive.
Before commencing with the replacement of a part the
boiler should be isolated from the electrical supply and the
gas supply should be turned off at the gas isolation valve.
When replacing a part, use only spare parts that you
can be assured conform to the safety and performance
specication that we require. Do not use reconditioned
or copy parts that have not been clearly authorised by
Saunier Duval.
After electrical connections have been made, checks to
the earth continuity, polarity, short circuit and resistance
to earth must be repeated using a suitable multimeter.
Unless stated otherwise, parts are replaced in the reverse
order to their removal.
After replacing these parts you MUST always test for gas
soundness and carry out functional test of the controls and
check the following:
General Inspection
After the replacement of a part, the following must be
checked.
● The integrity of the flue system and flue seals.
● The integrity of the appliance combustion circuit and
relevant seals.
● Electrical, gas and water connections.
● System pressure.
● the combustion performance, operational gas inlet
pressure and gas rates.
refer to the following procedure.
ALL MODELS
Refer to the installation and servicing instructions supplied
with your boiler to t the replacement gas valve.
After assembly, test for gas soundness and purge in
accordance with the current issue of BS6891 or in IE, the
current edition of I.S.813 “Domestic Gas Installations”.
COMPETENCY TO CARRY OUT THE CHECK
OF COMBUSTION PERFORMANCE
NOTE: BS 6798: 2009 Specication for installation
and maintenance of gas-red boilers of rated input not
exceeding 70kW net advises that:
● The person carrying out a combustion measurement
must be assessed as competent in the use of a ue gas
analyser and the interpretation of the results.
● The ue gas analyser used should be one meeting
the requirements of BS7927 or BS-EN50379-3 and be
calibrated in accordance with the analyser manufacturers’
requirements.
● Competence can be demonstrated by satisfactory
completion of the CPA1 ACS assessment, which covers
the use of electronic portable combustion gas analysers in
accordance with BS 7967, parts 1 to 4.
● Ensure that the gas analyser is set to the correct fuel
setting.
Diagram 1
Diagram 2
b

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LPG MODELS - ONLY
Please refer to the specic instruction relating to your
model and check/adjust the CO2 value, refer to table
overleaf.
Gas valve setting
All gas valves are tested and factory set during manufac-
ture.
It should not be necessary to adjust the gas valve.
NOTE: Safe combustion can only be verified by measuring
CO/CO2 ratio. This must not exceed the value shown in
the table overleaf.
● Shut down boiler.
● Connect a CO2 analyser to the combustion test point.
● Start the boiler.
● Press the «Mode» and «-» buttons simultaneously, the
letter “L” is displayed and the boiler is now running at low
gas ow rate. Allow the boiler to run for a few minutes to
stabilise, refer to the CO2 setting table and check that the
CO2 value is to specication, if adjustment is required,
proceed as follows.
NOTE: The adjustment should be made in 1/8 of a turn
increments, waiting 1 minute to allow the appliance to
stabilise.
● To adjust the CO2, remove protective cap (b) from the
gas valve. Carefully turn the gas valve adjuster until the
correct CO2 value is obtained according to table minimum
column.
● Press the «Mode» and «+» buttons simultaneously the
letter H is displayed and the boiler is now running at high
gas ow rate.
● Allow the boiler to run for a few minutes to stabilise and
check the CO2, refer to the CO2 setting table and check
that the CO2 value is to specication.
● Check the CO/CO2 combustion ratio does not exceed
the value in the table overleaf.
If the CO2 or CO/CO2 combustion ratio are not as
specied please refer to the “Completion” paragraph of
these instructions.
Check the Gas Inlet Pressure and Gas Rate
On completion, test the gas installation for tightness using
the pressure drop method and suitable leak detection uid,
purge in accordance with the above standard.
NOTE: Due to the modulating operation of the boiler and
the need to check the gas inlet pressure and measure the
gas rate at maximum rate, it will be necessary to force it to
maximum.
Operational Gas Inlet Pressure
With ALL other gas appliances operating, check the
operational supply pressure at the gas service isolation
valve test point, refer to your Installation literature supplied
with your appliance.
The nominal supply pressure for Natural Gas (G20) is
20mbar.
Turn the taps and appliances off, then disconnect the
pressure gauge.
Additionally the safe nominal maximum heat input of the
appliance can be achieved at an inlet pressure down to
15mbar.
NOTE: The BURNER PRESSURE cannot be measured
and is not used to measure the gas rate.
Gas Rate
Make sure that ALL other gas burning appliances and pilot
lights are off.
NOTE: Press the «Mode» and «+» buttons simultaneously
the letter “H” is displayed and the boiler is now running at
high gas ow rate.
Allow the boiler to run for a few minutes to stabilise and
check the CO2.
Check the gas rate using the gas meter test dial and stop
watch, at least 10 minutes after the burner has lit, see
table below for approximate rates.
In communal or LPG installations where the gas rate
cannot be measured it is acceptable to measure the
combustion rate as described in the servicing section.
On completion, reset the boiler to normal operation by
referring to the Installation and Servicing Instructions.
Completion
If it is not possible to achieve the required results for
either the combustion or gas rates, it will be necessary to
complete a full service of the appliance and then repeat
the combustion check procedure. If after servicing and
adjustment of the appliance the combustion values are still
unacceptable and after further remedial work has been
carried out, the appliance must be disconnected until the
CO/CO2 ratio is acceptable. Advice can be sought from
the Saunier Duval Technical Helpline 01773 828400.

0020096286-02 01.10
www.saunierduval.com
Models SETTING - OUTPUT SETTING - OUTPUT MAX. GAS RATES
Nat. Gas G20 - Case Off Nat. Gas G20 - Case On CO/CO2 Nat. Gas G20
OUTPUT MIN. 8.3 kW MAX. 28.0kW MIN. 8.3 kW MAX. 28.0kW Ratio MAXIMUM
Ecosy SB 28E 9.0 - 9.4%CO2 9.2 - 9.6%CO2 0.004 3.0 m3/h
Ecosy 28E 9.0 - 9.4%CO2 9.2 - 9.6%CO2 0.004 3.0 m3/h
OUTPUT MIN. 6.8 kW MAX. 24.5kW MIN. 8.3 kW MAX. 28.0kW Ratio MAXIMUM
Ecosy SB 24E 9.0 - 9.4%CO2 9.2 - 9.6%CO2 0.004 2.6 m3/h
Ecosy 24E 9.0 - 9.4%CO2 9.2 - 9.6%CO2 0.004 2.6 m3/h
Models SETTING - OUTPUT SETTING - OUTPUT MAX.
Nat. Gas G30 - Case Off Nat. Gas G30 - Case On CO/CO2
OUTPUT MIN. 9.9 kW MAX. 20.4kW MIN. 9.9 kW MAX. 20.4kW Ratio
Ecosy SB 24E 10.0 -10.3%CO2 10.3 - 10.6%CO2 0.004
Ecosy 24E 10.0 -10.3%CO2 10.3 - 10.6%CO2 0.004
Models SETTING - OUTPUT SETTING - OUTPUT MAX.
Nat. Gas G31 - Case Off Nat. Gas G31 - Case On CO/CO2
OUTPUT MIN. 11.4 kW MAX. 24.5kW MIN. 11.4 kW MAX. 25.4kW Ratio
Ecosy SB 24E 11.9 -12.1%CO2 12.3 - 12.5%CO2 0.004
Ecosy 24E 11.9 -12.1%CO2 12.3 - 12.5%CO2 0.004