Supplied By www.heating spares.co Tel. 0161 620 6677
8.12
D.H.W. HEAT EXCHANGER
– Remove the casing front panel as described in section 5.1.
– Isolate the C.H. flow and return valves, and the D.H.W. iso-
lation valve (19 - 18 - 20 fig. 2).
– Drain the appliance through the drain plug (13 fig 2).
– Drain the D.H.W. circuit by opening any D.H.W. tap below
the level of the boiler.
– Lift off the microswitch assembly.
– Remove the three screws fixing the D.H.W. heat exchang-
er and remove the heat exchanger.
– Fit new heat exchanger and re-assemble in reverse order
using the new gaskets supplied with the heat exchanger.
– Refill and re-commission the system as described in sec-
tion 4.1.
8.13
DIVERTOR VALVE - COMPLETE
– Remove the casing front panel as described in section 5.1.
– Isolate the C.H. flow and return valves, and the D.H.W. iso-
lation valve (19 - 18 - 20 fig. 2).
– Drain the appliance through the drain plug (13 fig 2)
– Drain the D.H.W. circuit by opening any D.H.W. tap below
the level of the boiler.
– Lift off the microswitch assembly.
– Remove the three screws fixing the D.H.W. heat exchang-
er and remove the heat exchanger.
– Pull out the divertor valve circlip and remove the valve.
– Transfer the electrical connections onto the new valve. If
necessary. refer to the wiring diagrams in section 7.
– Re-assemble in reverse order, using the new gaskets sup-
plied with the valve.
– Refill and re-commission the system as described in section 4.1.
8.14
DIVERTOR VALVE - MICROSWITCH ASSEMBLY
– Remove the casing front panel as described in section 5.1.
– Remove the two screws pivot the control box downwards.
– Lift off the microswitch assembly.
– Tr ansf er t he electr ical connections ont o t he new
microswitch assembly. If necessary refer to the wiring dia-
grams in section 7.
– Re-assemble in reverse order.
8.15
C.H. EXPANSION VESSEL
Replacement is not recommended if a rear flue outlet is used
or if the clearance above the casing is less than 300 mm.
– Remove the casing front panel as described in section 5.1.
– Isolate the C.H. flow and return valves (17 - 18 fig. 2), and
drain the appliance through the drain plug (13 fig. 2).
– Unscrew the expansion vessel union on the C.H. return
pipe.
– If a rear flue outlet is used it is necessary to disengage
the flue and air duct temporarily. Refer to section 3.5.
– Remove the adjusting screws on the wall mounting brack-
et thereby allowing the appliance to move slightly for-
wards at the top.
– Lift the expansion vessel out of the appliance through
the top.
– Replace the expansion vessel and re-assemble in reverse
order. Re-pressurise and re-commission the system as
described in section 4.1.
8.16
PRESSURE/TEMPERATURE GAUGE
– Remove the casing front panel as described in section 5.1.
– Isolate the C.H. flow and return valves (19 - 18 fig. 2).
– Drain the appliance through the drain point (13 fig. 2).
– Remove the circlip securing the pressure sensor to the
hydraulic group and pull out the sensor.
– Remove the fixing spring of the thermometer bulb from
the C.H. flow pipe.
– Squeeze the gauge to depress the retaining clips, then
ease the gauge forwards.
– Reassemble in reverse order.
Refill and re-commission the system as described in sec-
tion 4.1.
8.17
SAFETY VALVE
– Remove the casing front panel as described in section 5.1.
– Isolate the C.H. flow and return valves (19 - 18 fig. 2).
– Drain the appliance through the drain point (13 fig. 2)
– Remove the circlip securing the valve to the hydraulic
group and remove the valve.
– Fit the new safety valve and re-assemble in reverse order.
Refill and re-commission the system as described in sec-
tion 4.1.
8.18
AUTOMATIC AIR VENT
– Remove the casing front panel as described in section 5.1.
– Isolate the C.H. flow and return valves (19 - 18 fig. 2).
– Drain the appliance through the drain point (13 fig. 2).
– Remove the circlip securing the automatic air vent to the
hydraulic group.
– Fit the new automatic air vent and re-assemble in reverse
order. Refill and re-commission the system as described
in section 4.1.
8.19
TIME CLOCK
– Remove the casing front panel as described in section 5.1.
– Open the control panel protecting cover by removing the
four fixing screws.
– Pull off the electrical connections at the back of the clock.
– Remove the two screws securing the plastic frame of the
time clock to the facia panel.
– Remove the plastic frame and pull out the time clock.
– Re-assemble in reverse order and test the operation of
the new clock.
– Set it to the desired settings as described in section 4.3.
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