Benchmark Alpha InTec 24X Installation And Servicing Instructions page 34

7.20 DHW FLOW SWITCH - Fig. 32
1. Gain access behind the front casing as described in Section 7.1.
2. Isolate the mains water supply and open all hot taps to drain any water from the boiler.
3. Disconnect the wires from the switch.
4. Undo the union nut and remove the fixing scr w from the bottom of the switch.
5. Remove the two 4 mm socket head capscrews securing the top switch and lift out the switch.
6. Fit the new switch and re-assemble in reverse order.
7.21 PRIMARY HEAT EXCHANGER - Figs. 30 and 33
1. Gain access behind the room sealed chamber panel as described in Section 7.1 and drain the boiler heating circuit as
described in Section 7.2.
2. Remove the burner as described in Section 6.2 (Routine Servicing).
3. Unplug the connections from the flue tempe ature sensor and thermal fuse, see Fig. 30.
4. Disconnect the condensate drain pipe by pulling its rubber connector from the heat exchanger.
5. Remove the screws securing the ignition generator bracket, disconnect the earth lead and remove the ignition
generator.
6. Unplug the fan and remove it from the boiler.
7. Remove the heating fl w and return pipe-retaining clips from the primary heat exchanger and pull the pipes downwards
from the heat exchanger connections.
8. Slide the heat exchanger downwards and forwards to disconnect from the flue connection and withd aw it from the
boiler.
9. Re-assemble in reverse order, ensuring that new seals are used.
Lubricating the seals with soap and water will aid assembly.
10. Refill, pressu ise the system and vent the air from the heat exchanger using the manual air vent. (Refer to
Commissioning, Section 5.1).
7.22 PRESSURE GAUGE - Fig. 34
1. Gain access behind the casing and drain the boiler heating circuit as described in Sections 7.1 and 7.2.
2. Withdraw the retaining clip securing the pressure gauge sensor (just to the left of the automatic air vent) and withdraw
the sensor.
3. Remove the main cable grommet in the bottom panel and remove the sensor tube.
4. Depress the two lugs on the pressure gauge and push it out of the control panel.
5. Fit the new gauge using a new 'O' ring on the connection if necessary.
6. Refill and pressu ise the system. (Refer to Commissioning, Section 5.1).
34
Alpha InTec C and X - Component Replacement
Primary pressure switch
Pressure gauge sensor position
Automatic air vent
Pump
Pressure relief valve
Drain point
Pressure gauge
Fig. 34