29
– Isolate flow and return
– Turn on D.H.W tap
– Close cold water supply isolation valve
– Drain boiler using drain vent
– Remove 2 screws securing plate heat
exchanger
– Remove plate heat exchanger catching
any excess water
– Ensure that the four O rings are remo-
ved from the technil assembly
– Fit new O rings supplied with new heat
exchanger to the heat exchanger
– Refit in reverse order
6.14 SAFETY
VALVE
– Isolate from mains
– Remove cover
– Isolate flow and return valves
– Drain boiler using drain vent
– Disconnect pipe from safety valve
– Remove safety valve securing clip
– Remove safety valve
– Refit in reverse order
6.15 DIVERTER
VALVE
MOTOR HEAD
– Isolate mains
– Remove cover
– Remove pin from valve head body
– Disconnect lead
– Remove motor
– Refit in reverse order
6.16
AUTO AIR VENT
– Isolate boiler
– Remove cover
– Isolate flow and return valves
– Drain boiler using drain vents
– Pull clip forwards and lift auto air vent
upwards
– Refit in reverse order
6.17
DIVERTER CARTRIDGE
– Isolate boiler
– Remove cover
– Isolate flow and return valves
– Drain boiler using drain vent
– Remove motor head as 6.15
– Remove pin and withdraw the cartridge.
catching any excess water
– Refit in reverse order ensure cartridge
is locked in position
6.18
WATER PRESSURE SWITCH
– Isolate boiler
– Remove cover
– Isolate flow and return valves
– Drain boiler using drain vent
– Remove clip below the switch
– Disconnect the wiring
– Lift switch upwards
– Refit in reverse order
6.19
DHW FLOW SWITCH
– Isolate boiler
– Remove cover
– Isolate the cold water supply and open a
DHW tap
– Remove the two clips securing the pipe
connecting the flow switch assembly to
the DHW manifold, and remove the pipe,
catching any residual water
– Disconnect the wiring from the flow swit-
ch
– Remove the clip securing the flow switch
assembly to the cold water connection
– Remove the flow switch assembly
– Refit in reverse order
6.20 CONDENSE
TRAP
– Isolate boiler
– Remove cover
– Remove 2 condense pipes from con-
dense trap
– Remove locking nut holding trap to
bracket
– Refit in reverse order
6.21 FLUE
HOOD
– Isolate boiler
– Remove cover
– Remove air inlet duct
– Remove flue
– Remove condense pipe left hand side
of duct
– Remove 2 screws rear of flue duct
– Remove 2 screws top of boiler case
– Lift out flue duct
– Refit in reverse order
– Checking seals
