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8.17
Removal of Domestic Hot Water Heat Ex-
changer
Refer to figs. 33 and 34.
8.17.1
Gain General access 8.4.
8.17.2
Place receptacle or an absorbent pad below
appliance to catch trapped water.
8.17.3
Close cold water inlet stopcock.See fig. 6 and
6.3.2.4.
8.17.4
Open lowest draw-off or drain tap on hot water
system.
8.17.5
Close heating flow and return valves (fig. 6) by
turning 1/4 turn until indicating lines are hori-
zontal. Pull lever on head of safety valve to
drain primary circuit to boiler.
8.17.6
Remove domestic heat exchanger retaining
screw (L/H) and elongated brass nut (R/H).
8.17.7
Gently release heat exchanger from O' ring
seals by rocking to the rear and remove.
8.17.8
Remove insulation jacket and transfer to new
domestic heat exchanger.
8.17.9
Reassemble in reverse order, using new O'
rings if required.
8.18
Diverter Valve
8.18.1
Gain general access as 8.4.
8.18.2
Close heating flow and return valves (fig. 6) by
turning 1/4 turn until indicating lines are hori-
zontal. Pull lever on head of safety valve to
drain primary circuit to boiler.
8.18.3
Remove motorised valve. See 8.21.8.
8.18.4
Remove front of diverter valve by unscrewing
six retaining bolts.
8.18.5
See Fig.35 for further disassembly and loca-
tion of components.
8.18.6
Reassemble in reverse order.
8.19
Checking/Replacing Main Expansion
Vessel
8.19.1
The expansion vessel is factory pressurised
0.8 bar (12psig) and should be checked dur-
ing servicing. Should it have lost pressure it
can be repressurised in situ. Drain the boiler.
Fit a suitable pump and gauge (i.e. car foot
pump and gauge) to the nipple at the top right-
hand side of the expansion vessel, and pres-
surise to 0.8bar (12psig) and remove the
pump.
NOTE: Access to the nipple can be improved
by removing the upper vessel retaining bracket
and rocking the vessel forwards.
If the vessel cannot be repressurised or if
pressure loss is very frequent the expansion
vessel will require changing. Alternatively, a
new vessel can be fitted in the return to the
appliance, and the old vessel isolated in situ.
8.19.2
Switch OFF mains electricity and gain general
access. Disconnect electricity supply and wir-
ing for external controls from the appliance.
Linea Plus AG
Supplied By www.heating spares.co Tel. 0161 620 6677
8.19.3
Close heating flow and return valves (fig. 6) by
turning 1/4 turn until indicating lines are hori-
zontal. Pull lever on head of safety valve to
drain primary circuit to boiler.
8.19.4
Remove screws on large maintenance
clip/s (fig. 13) and remove. Loosen screws on
the small clip/s and disconnect flue.
8.19.5
Disconnect all pipe unions at the base of the
appliance.
8.19.6
Lift appliance off upper bracket.
8.19.7
Remove two screws retaining vessel securing
strap at top. Disconnect expansion pipe at
base of expansion vessel and lift vessel out of
the appliance.
8.19.8
Reassemble in reverse order, using new fibre
washers.
27
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