7
16. 3-Way valve
Drain boiler as in step 12. Remove the 2
clips on the 3 way valve hydraulic motor
17 (fig. 6). Pull up the motor .Turn anti-
clockwise the 3 way valve body, rise it up
using a screw driver and remove it.
Reassemble in reverse order.
17. Secondary heat exchanger 20
Drain both circuits of the boiler as in step
12. Unscrew the 2 fixing screws D and
remove the DHW exchanger from the
front. Prior to reassembly, check that the
4 gaskets are correctly positioned. The
heat exchanger is so designed that it
cannot be remounted incorrectly.
18. Main heat exchanger
Carry out steps 1 and 2 as above. Drain
boiler as in step
12. Remove the 2 clips
E located on return and flow pipes and
pull them downwards. Pull the main
exchanger toward you to remove.
Reassemble in reverse order
19. Expansion vessel
Remove the casing as step 1 and drain
the boiler as step 12 above. Unscrew the
connecting nuts and lift out the boiler
from the wall. Place it on a side on the
floor. Remove the expansion vessel
bracket retaining screws, disconnect the
pipe from the vessel and pull it toward
you. Reassemble in reverse order.
20. Pump
Drain the boiler as in step 12. Open the
electrical box cover removing the 2
screws. Remove the main lead connec-
tion. Open the electrical box, 2 clips
G
Remove the pump plug from the control
board and earth plug from earth socket.
Pivot the electrical box downwards.
Unscrew the nut
F of the flow pipe from
the volute. Remove the clip H on the
pump volute and pull pump toward you.
Remove the back clip.
Reassemble in reverse order.
21. Thermistors
Drain the boiler as step 12. Disconnect
the plug, remove the retaining clip pull
the thermistor out
Reassemble in reverse order.
10 = DHW thermistor
16 = Heating thermistor
18 = TSS thermistor
22. Control board
Carry out step 1, open the electrical box
cover as mentionned in step 5. unplug all
cables from the PCB remove earth plug
from earth socket undo the screw fixing
the PCB. Hang out the control board.
Reassemble in reverse order.
23. Safety thermostat
Remove the casing as step 1 unscrew
four self tapping screws securing the
sealed chamber front panel. Disconnect
the 2 cables, pull out the sensor with the
clip 13. Reassemble in reverse order.
24. R2i mini cylinder
You have to remove the hydraulic bloc.
Carry out steps
1 and 2 as above.
Drain the cylinder by removing the drain
plug J. Remove the 3 way valve as in
step 16. Remove all the connections of
main wiring. Remove the lid of connec-
tions box
K. Disconnect the pump from
electronic circuit. Remove the manome-
ter. Unscrew the nut
L of the pipe
between the pump and the primary heat
exchanger. Remove the gas pipe by
unscrewing the two nuts
M.
Remove the gas block by removing the 4
screws. Unscrew the last nuts of connec-
tion from the pre-installation gig.
Remove the two fastening screws of the
hydraulic block from the frame.
Pull all the hydraulic block toward you by
inclining it slightly. Remove the two clips.
Unscrew the two nuts fixing the cylinder.
Reassemble in reverse order.
E
13
D
G
F
H
10
16
18
J
K
L
M
