Grant COMBI 70 MkII - 8.2 Dismantling for servicing; 8.3 a Cleaning the boiler - Combi 70; 8.3 b Cleaning the boiler - Combi 90

Combi 70 & Combi 90 Oil Boilers
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8 - BOILER SERVICING
Dismantling prior to servicing
8.2
Cleaning the boiler - Combi 70
8.3a
Fig. 33 - Combi 70 baffle positions
Cleaning cover
Baffle No. 4
Baffle No. 3
Baffle No. 2
Baffle No. 1
Cleaning the boiler - Combi 90
8.3b
1 Open the case door and remove the grey plinth -
loosen the screw securing the right hand side of the
plinth inside the case. Withdraw the plinth forward
from the right and away from the case.
2 Carefully lift up the expansion vessel and remove it
from the front of the boiler. Place it on the floor,
taking care not to strain the flexible pipe.
3 Disconnect the flexible air tube from the burner.
4 Remove the burner fixing nut (top of mounting
flange) and withdraw the burner. If required,
disconnect the flexible oil line(s), use a suitable
container to prevent any oil spillage.
Note: If two flexible lines are connected to the
burner, identify (mark if necessary) which is the
inlet and return if they are to be disconnected.
5 Combi 70 - Remove the larger of the two top
casing panels (lifts off - four push-on fixings).
See Fig. 33
1 Remove the two nuts and washers securing the
cleaning cover to the top of the boiler and lift off
the cover. Take care not to damage the seal.
2 Remove the baffles, noting their position (see Fig.
35).
3 Remove all deposits from the baffle plates and all
the boiler internal surfaces using a stiff brush and
scraper if necessary.
4 Check the condition of the flue, clean as necessary.
5 Check the condition of the cleaning cover seal,
replace if necessary.
6 Replace the baffles, ensuring they are correctly
fitted. See Fig. 33.
Note (Combi 70): Baffle plate one is at the
bottom, then two, then three and four at the top
(see Fig. 33).
7 Replace the cleaning cover, securing it in position
with the two nuts and washers previously removed.
See Fig. 33.
See Fig. 34
1 Remove the four nuts and washers securing the
front cleaning door and withdraw the door.
Take care - it is heavy.
2 Remove the baffles as shown in Fig. 34.
3 Remove all deposits from the baffle plates and all
the boiler internal surfaces using a stiff brush and
scraper if necessary.
4 Check the condition of the flue, clean as necessary.
5 Check the condition of the front cleaning door seal,
replace if necessary.
6 Replace the baffles, ensuring they are correctly
fitted. See Fig. 34.
7 Replace the front cleaning door, securing it in
position with the four nuts and washers previously
removed.