Alpha InTec2 20SE Installation And Servicing Instruction page 43

Condensate trap
Gas valve
PCB cover
7.15 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 securing 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).
7.16 PRIMARY PRESSURE SWITCH - Fig. 7.3
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.
7.17 SAFETY VALVE - Fig. 7.3
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).
7.18 EXPANSION VESSEL - Fig. 7.1
Note: Check that the pressure of the new vessel is 1 bar before it is installed.
Gain access and drain the boiler heating circuit as described in Sections 7.1 and 7.2.
1. Remove the top side panel fixing screw.
2. Disconnect the copper pipe from the bottom of the vessel.
3. Remove the top fixing nut from the air valve.
4. Remove the bottom fixing screw and withdraw the vessel taking care not to spill any water into other boiler components.
5. Re-assemble in reverse order.
6. Refill and pressurise the system. (Refer to Commissioning, Section 5.1).
7.19 ALPHA CONTROLS (if fitted)
Refer to section 4.11 on the connection options for boiler controls.
Fig. 7.3
Alpha InTec² 20SE and 30SE - Component Replacement
Primary pressure switch
Pump
Safety valve
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