Sime Planet Dewy 100 BFR, Installation And Servicing Instructions

Page: 26 / 40

4.5 COMMISSIONING
INSTRUCTIONS
4.5.1 General (fig. 21)
Please no t e: t he combus tion f or t his
appliance has been checked, adjusted and
preset at the factory for operation on the
gas type defined on the appliance data
plate. However, it is advisable to check for
correct combustion as described in fig 21.
having first checked the following.
– That the boiler has been installed in
accordance with these instructions.
– The integrity of the flue system and the
flue seals.
– The integrity of the boiler combustion cir-
cuit.
Proceed to put the boiler into operation as
follows:
Check the operational (working) gas inlet
pressure
Set up the boiler(s) to operate at maximum
rate as described in 4.3.1 (chimney sweep)
With the boiler operating in the maximum
rate condition check that the operational
(working) gas pressure at the inlet gas pres-
sure test point (see fig. 17 item 1) complies
with the requirements of table 1.3.
Ensure that this inlet pressure can be
obtained with all other gas appliances in
the property working.
Competence to carry out the check of com-
bustion performance
Please note: BS 6798; 2009 Specification
for installation and maintenance of gas-
fired boilers of rated input not exceeding
70kW net advises that:
– The person carrying out a combustion
measurement should have been asses-
sed as competent in the use of a flue gas
analyser and the interpretation of the
results.
– The flue gas analyser used should be one
meeting the requirements of BS7927 or
BS-EN50379-3 and be calibrated in
accordance with the analyser manufac-
turers requirements, and
– Competence can be demonstrated by
satisfactory completion of the CPA1 ACS
assessment, which covers the use of
electronic por table gas analysers in
accordance with BS 7967, parts 1 to 4.
Combustion check
Connect the flue gas analyser to the flue
gas sampling point as shown in the dia-
gram.
Procedure for checking the combustion
Turn the heating control knob to maximum
and then remove it.
Locate adjuster “B” (Fig 16 drawing 2) and
note its position, after test return to this
position, boilers in cascade will normally
have adjuster “B” set to maximum.
Turn adjuster “B” to minimum (anti-clockwise)
Light the boiler and record the measure-
ments from the flue gas analyser = mini-
mum output.
Turn the adjuster “B” to maximum (clockwise).
Record the measurements from the flue
gas analyser = maximum output.
Compare the results to the following:
CO less than 200ppm
CO
2
between 8.7% and 9.3% natural gas,
and 9.7% and 10.3% LPG
Ratio less than 0.004
If the combustion reading is greater than
the acceptable value AND the integrity of
the complete flue system and combustion
circuit seals have been verified, and the gas
inlet pressure have been verified proceed
as shown in 4.1
Any adjustments should be done in small
steps and adjustments of no more than
1/8th of a turn should be made, waiting at
least 1 minute between adjustments to
allow the settings to stabilise. Using the
CO
2
reading, adjustments should be made
to the “OFF-SET” screw (2 drawing 6) if it is
incorrect at the minimum output, or to the
“SHUTTER” (1 drawing 6) if it incorrect at
the maximum output.
If an acceptable setting level cannot be
achieved, re-confirm that the integrity of
the flue system, combustion circuit and
working gas supply pressure. If required
contact Sime Ltd for further assistance.
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Fig. 21