Alpha Evoke 28NX and 33NX - Component Replacement
8.14 PRESSURE GAUGE - Fig. 8.1
Gain access and drain the heating circuit as described in Sections 8.1 and 8.2.
1. Carefully open the retaining hook on the control panel and push the pressure gauge out of it.
2. Withdraw the retaining clip securing the pressure gauge sensor (just to the left of the automatic air vent) and withdraw the sensor.
Note: This is a direct sensor, ensure all electrical components are protected from water escape.
3. Mark the path of the sensor tube around the main wiring.
4. Remove the main cable grommet in the bottom panel and remove the sensor tube.
5. Fit the new gauge sensor using a new 'O' ring on the connection if necessary. Repeat the same path around main
wiring of the sensor tube removed to prevent cracking.
6. Reassemble in reverse order.
7. Refill and pressurise the system. (Refer to Commissioning, Section 6.1).
8.15 PRIMARY TEMPERATURE SENSORS - Fig. 7.8
Gain access to the boiler as described in Section 8.1.
1. Unplug the wiring and unclip the sensor from the flow or return pipe as required. Re-assemble in reverse order with a
new sensor onto the conductive paste ensuring good contact between the pipe and sensor.
8.16 AUTOMATIC AIR VENT - Fig. 7.8
Gain access and drain the boiler heating circuit as described in Sections 8.1 and 8.2.
1. Unclip and remove the silicon tube from the automatic air vent discharge connection.
2. Turn the automatic air vent anticlockwise and lift it out.
3. Insert the new air vent and turn it clockwise to lock it in position.
4. Reassemble the silicone tube and clip.
5. Refill and pressurise the system. (Refer to Commissioning, Section 6.1).
8.17 PUMP HEAD - Fig. 7.8
Gain access and drain the boiler heating circuit as described in Sections 8.1 and 8.2.
1. Disconnect the two wiring connectors from the pump.
2. Using a 4 mm Allen key remove the four socket head screws securing the pump head to the body.
3. Reassemble the new pump head in reverse order, re-connecting the two wiring connectors.
4. Refill and pressurise the system. (Refer to Commissioning, Section 6.1).
8.18 PRIMARY PRESSURE SWITCH - Fig. 7.8
Gain access and drain the boiler heating circuit as described in Sections 8.1 and 8.2.
1. Disconnect the wiring from the pressure switch.
2. Withdraw the retaining clip on the left side of the switch and lift the switch upwards to remove.
Note: This is a direct component, ensure all electrical components are protected from water escape.
3. Insert a new switch and re-assemble in reverse order.
Note: When connecting the wiring to the new switch the polarity of the wires is not important.
8.19 SAFETY VALVE - Fig. 7.8
Gain access and drain the boiler heating circuit as described in Sections 8.1 and 8.2.
1. Disconnect the clear plastic tube from the pressure relief valve.
2. Remove the retaining clip securing the expansion relief valve and pull the valve forwards to remove.
3. Re-assemble in reverse order.
4. Refill and pressurise the system. (Refer to Commissioning, Section 6.1).
8.20 DHW HEAT EXCHANGER - Fig. 7.8
Gain access and drain the boiler heating and hot water circuits as described in Sections 8.1 and 8.2.
1. Remove condensate trap as in Section 8.11.
2. Using a 4 mm Allen key remove the two bolts securing the Plate heat exchanger to the hydro block assembly.
3. Slide the heat exchanger to the left hand corner of the boiler and rotate it forwards from its right hand side through the
centre of the boiler to remove.
4. Remove and replace the seals in the back of the hydro block housing.
5. Replace in reverse order making sure that the printed writing on the heat exchanger is at the top.
6. Refill and pressurise the system. (Refer to Commissioning, Section 6.1).
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