Technical information

35
Combi 70 & Combi 90 Oil Boilers
Fig. 32 - shown with pipework cover removed
6 - COMMISSIONING
Refer to Fig. 32 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 Remove the pipework cover and 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 plastic burner cover (two screws) if it
was not previously removed. To gain access, it may
be necessary to remove the grey plinth - loosen the
screw securing the right hand side of the plinth,
then withdraw the plinth forward from the right and
away from the case.
4 Connect a combined vent manifold and pressure
gauge to the pressure gauge connection port on the oil
pump. See Fig. 31. Open the vent screw on your vent
manifold to vent the supply while the pump is running.
5 Set the heating On/Off switch to 'OFF' and the timer
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 for a few
moments to vent the internal primary circuit. Set
the heating On/Off switch to 'ON' (the green neon
will light). The boiler pump 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, sections 2.2
and 2.3. Adjust the pressure if necessary - see Fig.
31.
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.