15
Alpha CombiMax 350 and 600
8.8
DHW EXPANSION VESSEL - See Fig. 8
Note: If a top rear flue has been fitted to the boiler, it may be necessary to loosen the flue connections to the boiler so as to
raise the height of the flue by approximately 10 mm to allow removal of the expansion vessel.
1.
Close the mains water inlet valve and ensure that all hot water taps are closed. Release the pressure from the hot water
circuit by opening and closing a hot tap which is lower than the store.
2.
Disconnect the expansion vessel union and for the CombiMax 600 remove the two screws securing the vessel to the right
side rear frame of the boiler.
3.
Remove the expansion vessel.
4.
Re-assemble in reverse order with a new vessel. Refill and pressurise the hot water circuit by opening the mains water
inlet valve.
8.9
DHW EXPANSION RELIEF VALVE - See CombiMax Schematic illustration
1.
Drain the CombiMax as described in section 8.2.
2.
Disconnect the valve pipework unions and remove the valve.
3.
Re-assemble in reverse order with a new valve.
4.
Refill the store (refer to Commissioning, section 5.1).
8.10 PRESSURE REDUCING VALVE FILTER/CARTRIDGE - See CombiMax Schematic illustration
1.
Close the mains water inlet valve and ensure that all hot water taps are closed. Release the pressure from the hot water
circuit by opening and closing a hot tap which is lower than the store.
2.
Unscrew the cartridge from the valve body.
3.
Clean or replace the filter/cartridge and re-assemble in reverse order.
4
Refill and pressurise the hot water circuit by opening the mains water inlet valve.
8.11 PRESSURE REDUCING VALVE/CHECK VALVE - See CombiMax Schematic illustration
1.
Drain the CombiMax as described in section 8.2.
2.
Disconnect the unions of the pipe between the water mains inlet valve and pressure reducing valve, and remove the pipe
from the manifold plate.
3.
Remove the pressure reducing valve/check valve.
4.
Re-assemble in reverse order with a new valve.
5.
Refill the store (refer to Commissioning, section 5.1).
8.12 BOILER FLOW CONTROL REGULATOR - See Fig. 9
1.
Drain the CombiMax as described in section 8.2.
2.
Refer to Fig. 9 and disconnect the pipework containing the regulator.
3.
Remove the regulator.
4.
Re-assemble in reverse order with a new regulator.
5.
Refill the store (refer to Commissioning, section 5.1).
8.13 DHW STORAGE CYLINDER - See CombiMax Schematic illustration
1.
Drain the CombiMax as described in section 8.2.
2.
Disconnect the DHW expansion vessel connection to the cylinder.
3.
Remove the DHW outlet thermostat as described in section 8.4.
4.
Remove the DHW temperature/pressure relief valve as described in section 8.6.
5.
Remove the DHW expansion relief valve as described in section 8.8.
6.
Remove the DHW pump as described in section 8.3.
7.
Remove the pressure reducing valve as described in section 8.10.
8.
Remove the store thermostat as described in section 8.5.
9.
Disconnect all the pipework from the cylinder.
10. Cut and release the plastic security strap and lift the cylinder upwards to disengage it from the mounting frame. Pull the
cylinder forward and remove it.
11. Re-assemble in reverse order with a new cylinder, using new seals and new plastic security strap supplied.
12. Refill the store (refer to Commissioning, section 5.1).