Combi 90 Outdoor Module
16
6 - COMMISSIONING
Refer to Fig. A, page 3, for boiler controls
It is important that the following commissioning
procedure is carried out to ensure safe and efficient
operation of the boiler.
Note: Check that the baffles are in position and
that the cleaning cover is correctly fitted and a
good seal made.
1 Check that the water system has been vented and
pressurised, and there are no leaks.
2 Check that all fuel line valves are open.
3 Remove the boiler casing front panel and the
plastic burner cover (two screws) if they were not
previously removed.
4 Connect a combined vent manifold and pressure
gauge to the pressure gauge connection port on the oil
pump. Open the vent screw on your vent manifold to
vent the supply while the pump is running.
5 Set the boiler On/Off switch to 'OFF'. Check that
all system controls are calling for heat and turn the
boiler thermostat to maximum. Switch on the
electricity supply.
6 Fully open a hot tap and allow it to run to vent the
internal primary circuit. Set the boiler, burner and
pump On/Off switches to 'ON'. The boiler will
operate and the burner should light within about 10
seconds. If the burner does not light and the 'Lock-
out' reset button lights, wait for about 45 seconds
then press the reset button to restart the ignition
process. This procedure may have to be repeated
several times during first lighting.
7 Set the timer switch to 'CONSTANT' and close the
hot tap, the boiler will now be operating in the
central heating mode.
8 With the burner alight, check the fuel pressure.
Refer to the Technical Information, see section 2.3
or 2.4. Adjust the pressure if necessary.
9 Operate the boiler until it reaches normal operating
temperature. Check oil supply/return pipe for leaks,
rectifying where necessary.
10 With the burner alight, re-check the fuel pressure and
re-adjust if necessary. Switch the boiler off, remove
the pressure gauge and replace the plug in the pump.
11 Having ensured that there are no oil leaks, replace
the burner cover.
12 Relight the boiler and allow it to run for 20 minutes
then check the following:-
CO
2
level, Flue gas temperature and Smoke Number.
Refer to the Technical Information in Section 2.3 or
2.4. A test point is provided in the flue deflector.
13 Check the smoke number, if satisfactory check the
CO
2
. Adjust the burner air regulator. Turning the
screw anticlockwise closes the damper and
increases CO
2
level, turning the screw clockwise
opens the damper and reduces CO
2
level.
Re-check the smoke number if the air damper has
been moved.
Under no circumstances must the smoke number be
above 1.
A suitable position for the air damper is one which
gives 1% less CO
2
than that which has a smoke
number of 1.
Note: To obtain the correct CO
2
level, the final
flue gas reading must be taken with all casing
and door panels fitted.
Note: It is important that the air damper is
correctly set.
14 Check the flue gas temperature.
15 Check the boiler overheat thermostat by removing
the boiler thermostat phial (the shorter one) from
the pocket in the back of the boiler, just to the left
above the pump. The boiler should switch off on the
overheat thermostat. Replace the phial. Unscrew
and remove the plastic cap covering the reset
button, press the reset button and replace the cap.
16 When the boiler has been adjusted and is running
satisfactorily, balance the central heating system by
adjusting the radiator lock shield valves. Start with
the radiator nearest the boiler and adjust the valves
to achieve the required temperature drop across
each radiator. If thermostatic radiator valves have
been installed, check the system by-pass.
17 Switch off the boiler.
18 With the system hot, check again for leaks, rectifying
where necessary. Drain the heating system while it is
hot to complete the flushing process.
19 Refill, vent and pressurise the system as described in
main installation and servicing instructions, adding a
suitable inhibitor. For further information concerning
inhibitors contact Grant Engineering (UK) Limited.
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