Technical data

26
Linea 24 & 28
8.14 Pump
Part No 10020437 See fig. 33
8.14.1 Gain general access as 8.4
8.14.2 Close heating flow and return valves (fig. 6),
by turning 1/4 turn until indicating lines are
horizontal. Pull lever on head of safety valve
to drain primary circuit to boiler.
8.14.3 Place cloth under pump to catch surplus wa-
ter.
8.14.4 HEAD ONLY Unscrew the 4 allen screws
around the pump head. Pull head from base of
pump and disconnect electrical leads. If re-
placement required, use the head from a
standard 15-50 Grundfos
8.14.5 COMPLETE PUMP Disconnect pipe union
connection at front left corner of combustion
chamber. See fig. 34
8.14.6 Disconnect push fit pipes from pump base by
removing seecuring clips and pulling pipes
free from base. See fig. 34
8.14.7 Remove screw from pump securing bracket.
8.14.8 Grasp pump and pull upwards with slight
twisting movement to release pump from
manifold.
8.14.9 Disconnect electrical leads from pump.
8.14.10 Remove pump securing bracket from pump
housing and transfer to new body.
8.14.11 Reassemble in reverse order.
Reconnect electrical leads Brown to L, Blue to
N and Green to E.
8.15 Domestic Flow Switch
Refer to fig. 34.
8.15.1 Gain general access as 8.4.
8.15.2 Place receptacle or an absorbent pad below
appliance to catch trapped water.
8.15.3 Close cold water inlet stopcock. See fig.6
8.15.4 Open lowest draw-off or drain tap on hot water
system.
8.15.5 Disconnect cold water inlet valve from flow
switch by undoing union.
8.15.6 Disconnect union at top of flow switch and two
electrical tab connectors.
8.15.7 Undo lock nut securing flow switch to base
frame and remove.
8.15.8 Reassemble in reverse order.
8.16 Hydraulic Manifold
8.16.1 Gain general access as 8.4
8.16.2 Place receptacle or an absorbent pad below
appliance to catch trapped water.
8.16.3 Remove domestic hot water heat exchanger
as 8.17.
8.16.4 Remove motorised valve as 8.21.8.
8.16.5 Release pressure switch from hydraulic mani-
fold by removing retaining screw
8.16.6 Remove cold water connecting pipe by undo-
ing the unions at both ends.
8.16.7 Disconnect flow tube union where it connects
onto the hydraulic group.
8.16.8 Remove pump as 8.14.5
8.16.9 Unscrew pressure gauge connection retain-
ing screw and pull out pressure gauge
connnection.
8.16.10 Disconnect safety valve discharge pipe and
heating valve unions.
8.16.11 Remove retaining screw securing hydraulic
group to frame.
8.16.12 Withdraw hydraulic group from appliance. See
fig. 35 for further disassembly.
8.16.13 Reassemble in reverse order ensuring that
washers are replaced in all union connec-
tions.
Gas Valve
& Ignition Control
Box
Domestic Hot
Water Flow Switch
Safety
Valve
Pump
Pressure
Switch
Domestic
Heat
Exchanger
Fig. 34
Pump Pipe
Union
Diverter Valve