Technical data

32
Alpha 240XP and 240XE - Component Replacement
8.36 MAINS WATER INLET VALVE FILTER - Fig. 37
1. Drain the boiler hot water circuit as described in
section 8.2.
2. Unscrew the valve end cap fitting and withdraw
the filter.
3. Clean or replace and re-assemble in reverse order.
8.37 HEATING RETURN FILTER - Fig. 37
1. Drain the boiler heating circuit as described in
section 8.2.
2. Unscrew the heating return valve end cap fitting
and withdraw the filter.
3. Clean or replace and re-assemble in reverse order.
8.38 DIVERTER VALVE ASSEMBLY - Fig. 38
1. Drain the boiler heating and hot water circuits as
described in section 8.2.
2. Remove the two flow switch assemblies from the
diverter valve.
3. To avoid damage to the CH temperature sensor
on the flow pipe, disconnect its wires (red).
4. Disconnect the following connections from the
diverter valve:-
Two flow sensing pipes, pressure gauge sensor,
expansion vessel connection (release the other
end to allow the pipe to be moved out of the
way), CH flow pipe, small by-pass pipe, CH flow
isolating valve.
5. Remove the clips (accessible from under the
boiler) retaining the by-pass pipe to the manifold
and diverter valve, and withdraw the pipe.
6. Remove the screw securing the diverter valve to
the chassis (accessible from under the boiler).
Withdraw the valve slightly to disengage it from
the manifold, then lift it out of the boiler.
7. Re-assemble in reverse order using the new
seals supplied.
8. Refill and pressurise the system. (Refer to
Commissioning, section 5.1).
Fig. 36
Differential
pressure sensor
Filter
Restrictor
Fig. 38
Pressure gauge
sensor
DHW flow
microswitch assy.
DHW temperature
sensor
CH expansion
vessel connection
CH by-pass
Primary flow
microswitch assy.
DHW flow
sensing
pipes
Mains water
isolating valve
CH return
isolating valve
Fig. 37