Potterton Promax SL range Installation & Service Instructions Manual page 40

Verify Integrity of Seals
Check all burner seals, internal
flue seals, door & case seals.
Replace any seals that appear
unsound.
Call 0844 871 1555 for advice.
The appliance MUST NOT be
commissioned until all
problems are identified and
resolved.
If commissioning cannot be
fully completed the appliance
must be disconnected from
the gas supply in accordance
with the GSIUR.
Note: Check & record the CO
& combustion ratio at both
maximum & a low rate before
calling 0844 871 1555.
40
© Baxi Heating UK Ltd 2014
Perform Flue Integrity
Visual Check
Examine all flue joints for
soundness and ensure the
system is adequately
supported.
No
Is flue system OK ?
Is CO < 350ppm
and CO/CO
2
ratio < 0.004 ?
No
TURN APPLIANCE OFF !
Set Boiler to Maximum Rate*
Yes
Allow the combustion to
stabilise. Do not insert probe
to avoid 'flooding' the analyser.
Check CO & Combustion
Ratio at Maximum Rate
Whilst the boiler is still
operating at maximum insert
the analyser probe into the
flue gas test point, allowing the
reading to stabilise.
Is CO < 350ppm
No
and CO/CO
2
ratio < 0.004 ?
12.0 Commissioning the Boiler
12.2 Checking the Combustion
1. This procedure is mandatory in GB from April 2014. It is
strongly recommended to perform the procedure before that
date.
*To operate at Maximum Rate
Ensure all external controls are
calling for heat, that the system
is cold and the boiler control
knob is turned fully clockwise.
Yes
Set Boiler to operate at a low
rate. If it is not possible to adjust
the boiler to run at minimum rate
using the boiler controls, the
system must be set such that the
boiler will modulate to as low an
input as possible without the
burner extinguishing (e.g. by
closing radiator valves)
Allow the combustion to
stabilise. Do not insert probe to
avoid 'flooding' the analyser.
The gas rate must be checked &
recorded whilst the boiler is
operating in this condition.
No
Is CO < 350ppm
and CO/CO
2
ratio < 0.004 ?
Yes
BOILER OPERATING
SATISFACTORILY. NO
FURTHER ACTION
REQUIRED
Ensure test points are capped,
the boiler case front panel is
correctly fitted & secured and
all other commissioning
procedures completed.
Complete the 'Benchmark'
Checklist, recording the
CO & combustion ratio
readings as required.