Safety Relief Valve Renewal; Pump Automatic Air Vent Replacement; Dhw Filter & Flow Reg Cleaning/Replacement - Zanussi ULTRA+ COMBI 30 Installation And Servicing

3.23 SAFETY RELIEF VALVE REPLACEMENT
1. Refer to Section 3.8.
2. Drain the boiler. Refer to Section 3.21.
3. Remove the clip on return thermistor. Refer to Section 3.12.
4. Pull out and remove the clip (positioned behind the safety
valve) retaining the safety valve.
5. Undo the safety valve pipe compression fitting positioned
outside the boiler casing.
6. Lift out the safety valve/pipe assembly.
7. Remove the safety valve pipe and transfer to the new safety
valve.
8. Reassemble in reverse order ensuring the retaining clip is
correctly fitted, the pipe compression fitting retightened and
return thermistor is re-clipped.
9. Refill the boiler. Check that the boiler operates in both DHW
& CH modes.

3.24 PUMP AUTOMATIC AIR VENT REPLACEMENT

1. Refer to Section 3.8.
2. Drain the boiler. Refer to Section 3.21.
3. Remove the expansion vessel. Refer to Section 3.32.
4. Firstly, increase access area by disconnecting the 22mm pipe connection at
top of pump manifold and bottom of heat exchanger and remove pipe. Refer
to Section 3.26.
5. The automatic air vent head is retained in the pump body with a bayonet
connection. The air vent head and float assembly is removed by turning the
head anti-clockwise (viewed from above) and pulling upwards.
6. Reassemble in reverse order. Ensure the air vent head 'o' ring seal is fitted.
7. Ensure the air vent cap is loose.
8. Refill the boiler. Refer to Section 2.17. Check for leaks around the new air vent
joint.
9. Check that the boiler operates in both DHW & CH modes.
3.25 DHW FILTER & DHW FLOW REGULATOR CLEANING/REPLACEMENT
1. Refer to Section 3.8.
2. Drain the DHW system. Refer to Section
3.21.
3. Turn the housing anti clockwise and pull
forward to remove the cartridge.
4. Using a pair of pliers, pull out the plastic
filter/flow regulator.
5. Clean or replace filter as necessary.
6. Reassemble in reverse order.
7. Refill the boiler.
8. Check that the boiler operates in both
DHW & CH modes.
50
SECTION 3 - SERVICING
4
3
3 4
Dust Cap
5
Installation and Servicing