Diverter Valve - Potterton Combi 80 Installation & Service Instructions Manual

Replacement of Parts - Page 33
5.22

Diverter Valve

The diverter valve is made up in two parts. The wax
capsule head forms one part and provides the motive
power to open the valve. The second part, the valve
consists of the change over mechanism and the valve
seating. It is likely that only replacement of the head will
be necessary, if the complete valve requires
replacement proceed to (ii).
(i) Wax Capsule Head
1. Remove the white front case and base panel.
See 4.1 & 4.2in 'Routine Maintenance'.
2. Lower the control panel assembly by undoing the
securing screw at the top right hand side of the
control panel.
3. Close the 15mm cold water isolating valve, open the
lowest hot water tap and remove the D.H.W drain
screw in the isolating valve to drain the system.
4. Drain the central heating circuit as described on
Page 26.
5. Undo the two D.H.W pipe connections to the valve
head. Retain the two pipe seals.
6. Unscrew the two grub screws (2 mm hexagon key)
which hold the head to the main body. Pull the head
forwards using a twisting action and carefully
remove the head. Note the position of the loose
brass cylinder on the wax capsule push rod and
transfer onto new head assembly.
7. Fit new wax capsule head, re-assemble in reverse
order. Replace pipe seals is necessary.
(ii). Complete valve replacement
1. Perform steps 1. to 5. in (i) above.
2. Undo the Central heating pipe connections to the
diverter valve body and loosen the two nuts
retaining the C.H. Flow and Return pipe tails.
3. Remove the locknut at the rear of the diverter valve
holding the valve to the front cross brace.
4. Undo connection to the pump manifold and
withdraw the diverter valve from the boiler.
- Fig. 22