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8.14 PRESSURE GAUGE - Fig. 8.1
Gain access and drain the heating circuit as described in Sections 8.1 and 8.2.
1.
Depress the two lugs on the pressure gauge and pull it out of the control panel.
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.
Remove the main cable grommet in the bottom panel and remove the sensor tube.
4.
Fit the new gauge sensor using a new 'O' ring on the connection if necessary.
5.
Reassemble in reverse order.
6.
Refill and pressurise the system. (Refer to Commissioning, Section 6.1).
8.15 PRIMARY TEMPERATURE SENSORS - Fig. 7.6
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. 7.6
Gain access and drain the boiler heating circuit as described in Sections 8.1 and 8.2.
1.
Turn the automatic air vent anticlockwise and lift it out.
2.
Insert the new air vent and turn it clockwise to lock it in position.
3.
Refill and pressurise the system. (Refer to Commissioning, Section 6.1).
8.17 PUMP HEAD - Fig. 7.6
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. 7.6
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. 7.6
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).
46
Alpha E-Tec Plus 28, 33 and 38 - Component Replacement
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