35
7.23 PRIMARY TEMPERATURE SENSOR - Fig. 30
1. Gain access as described in Section 7.1 and drain the heating circuit described in Section 7.2.
2. Disconnect the wiring and unscrew the sensor. Re-assemble in reverse order with a new sensor and sealing washer.
3. Refill and pressu ise the system. (Refer to Commissioning, Section 5.1).
7.24 AUTOMATIC AIR VENT - Fig. 34
1. Gain access behind the front casing and drain the boiler heating circuit as described in Sections 7.1 and 7.2.
2. Turn the automatic air vent anticlockwise and lift it out
3. Insert the new air vent using a new washer and turn it clockwise to lock it in position.
4. Refill and pressu ise the system. (Refer to Commissioning, Section 5.1).
7.25 PUMP - Fig. 34
Gain access behind the front casing and drain the boiler heating circuit as described in Sections 7.1 and 7.2.
Pump head
1. Using a 4 mm Allen key remove the four socket head screws securing the pump head to the body. Withdraw the head
and disconnect the plug.
2. Connect the plug to the new head. Ensure the pump is set to maximum (3) and re-assemble in reverse order.
3. Refill and pressu ise the system. (Refer to Commissioning, Section 5.1).
7.26 PRIMARY PRESSURE SWITCH - Fig. 34
1. Gain access behind the front casing and drain the boiler heating circuit as described in Sections 7.1 and 7.2.
2. Disconnect the wiring from the pressure switch.
3. Withdraw the retaining clip on the left side of the switch and lift the switch upwards to remove.
4. Insert a new switch and re-assemble in reverse order.
When connecting the wiring to the new switch the polarity of the wires is not important.
7.27 PRESSURE RELIEF VALVE - Fig. 34
1. Gain access behind the front casing and drain the boiler heating circuit as described in Sections 7.1 and 7.2.
2. Disconnect the pressure relief valve outlet fitting
3. Remove the two screws securing the expansion relief valve and the left hand DHW manifold securing screw.
4. Withdraw the retaining clip from the valve and pull the valve from the pump housing.
5. Re-assemble in reverse order.
6. Refill and pressu ise the system. (Refer to Commissioning, Section 5.1).
7.28 DHW HEAT EXCHANGER
1. Gain access behind the front casing and drain the boiler heating and hot water circuits as described in Sections 7.1 and
7.2.
2. Release the nut securing the condensate pipe and remove the fl xible condensate pipe from the condensate trap.
Rotate the pipe to clear.
3. To create more space to withdraw the heat exchanger - Remove the screw securing the fan air inlet pipe and remove
the pipe, remove the screws securing the fan and move it to the right hand side of the chamber.
4. Remove the diverter valve motor as described in Section 7.13.
5. Using a 4 mm Allen key unscrew the two socket head capscrews securing the DHW heat exchanger. Withdraw the heat
exchanger from the boiler by moving it to the left and rotating it to remove.
Note:
Be careful not to allow water to drip onto any electrical components.
6. Re-assemble in reverse order making sure that the printing on the heat exchanger is at the top when fitted and that the
seals are in position in the manifold.
7. Refill and pressu ise the system. (Refer to Commissioning, Section 5.1).
Alpha InTec C and X - Component Replacement
