43
7.15 PRESSURE GAUGE - Fig. 7.2
Gain access to the boiler as described in Sections 7.1 and 7.2.
1. Withdraw the retaining clip securing the pressure gauge sensor (just to the left of the automatic air vent) and withdraw
the sensor.
2. Remove the main cable grommet in the bottom panel and remove the sensor tube.
5. Depress the two lugs on the pressure gauge and pull it out of the control panel.
4. Fit the new gauge using a new 'O' ring on the connection if necessary.
5. Refill and pressurise the system. (Refer to Commissioning, Section 5.1).
7.16 PRIMARY FLOW/RETURN TEMPERATURE SENSORS and OVERHEAT THERMOSTAT - Fig. 7.1
Gain access as described in Sections 7.1.
1. Unplug the wiring and unscrew the sensor using a 13 mm spanner.
2. Re-assemble in reverse order with a new sensor. Do not overtighten.
7.17 AUTOMATIC AIR VENT - Fig. 7.1
Gain access and drain the boiler heating circuit as described in Sections 7.1 and 7.2.
1. Turn the automatic air vent anticlockwise and lift it out.
2. Insert the new air vent using a new washer and turn it clockwise to lock it in position.
3. Refill and pressurise the system. (Refer to Commissioning, Section 5.1).
7.18 PUMP HEAD - Fig. 7.3
Gain access and drain the boiler heating circuit as described in Sections 7.1 and 7.2.
1. Disconnect the two plugs from the pump.
2. Using a 4 mm Allen key remove the four socket head screws suring the pump head to the body.
3. Reassemble the new pump head in reverse order ensuring, re-connecting the two plugs.
4. Refill and pressurise the system. (Refer to Commissioning, Section 5.1).
7.19 PRIMARY PRESSURE SWITCH - Fig. 7.1
Gain access and drain the boiler heating circuit as described in Sections 7.1 and 7.2.
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.
3. 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.
7.20 SAFETY VALVE - Fig. 7.41
Gain access and drain the boiler heating circuit as described in Sections 7.1 and 7.2.
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 5.1).
7.21 DHW HEAT EXCHANGER - Fig. 7.1
Gain access and drain the boiler heating and hot water circuits as described in Sections 7.1 and 7.2.
1. Remove condensate trap as in Section 7.11.
2. Remove diverter valve motor as in Section 7.22.
3. Using a 4 mm Allen key remove the two bolts securing the Plate heat exchanger to the hydro block assembly.
4. 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.
5. Remove and replace the seals in the back of the hydro block housing.
6. Replace in reverse order making sure that the printed writing on the heat exchanger is at the top.
Alpha InTec² 25XE and 28XE - Component Replacement
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