Technical data

8.26 HEAT EXCHANGER

1. Drain the boiler heating circuit as described in section 8.2.

2. Remove the fan and flue hood assembly as described in section 8.9.

3. Carefully prise off the two clips from the heat exchanger to flow/return pipes.

4. Lift up the heat exchanger off the pipes.

5. Fit a new heat exchanger, ensuring the 'O' rings are in position in the flanges. Lubricating the 'O' rings with a soap solution

with aid assembly. Ensure the base of the heat exchanger is correctly located over the combustion chamber sides.

6. Replace the clips - narrow side to the bottom, ensuring the tops are correctly engaged in the slots.

7. Re-assemble in reverse order.

Alpha 240XE - Connect the fan wiring, blue to terminal 1 and brown to terminal 2.

Alpha 240XP - Connect the fan wiring, blue to terminal 'MIN', brown to terminal 'MAX' and black to terminal 'COM'.

Ensure the pressure tubes are connected correctly - refer to Fig. 21, and that the bottom of the combustion chamber cover

is located in the burner.

8. Refill and pressurise the system. (Refer to Commissioning, section 5.1).

8.27 COMBUSTION CHAMBER INSULATION

1. Gain access as described in section 8.1.

2. Side and front panels slide out.

3. To replace the rear panel remove the heat exchanger as described in section 8.26 and slide out the side insulation panels.

Prise out the top of the rear insulation panel and lift it up and out of the boiler.

4. Fit a new panel and re-assemble in reverse order.

Alpha 240XE - Connect the fan wiring, blue to terminal 1 and brown to terminal 2.

Alpha 240XP - Connect the fan wiring, blue to terminal 'MIN', brown to terminal 'MAX' and black to terminal 'COM'.

Ensure the pressure tubes are connected correctly - refer to Fig. 21, and that the bottom of the combustion chamber cover

is located in the burner.

5. Refill and pressurise the system. (Refer to Commissioning, section 5.1).

8.28 PRESSURE GAUGE - Fig. 32

1. Drain the boiler heating circuit as described in section 8.2.

2. Remove the nut securing the pressure gauge sensor to the R/H side of the diverter valve and withdraw the sensor.

3. Remove two screws securing the gauge to the control panel and withdraw.

4. Fit the new gauge using a new washer on the diverter valve connection if necessary.

5. Refill and pressurise the system. (Refer to Commissioning, section 5.1).

Alpha 240XP and 240XE - Component Replacement

Pressure gauge

sensor

Fig. 32