Technical data

19
Remove securing clip
Ease pump head forwards
off the “O” ring seals
Remove securing clip
“O” ring seals
Disconnect the flexible hose from the bottom
manifold and fit the open vent pipe supplied as
an optional extra
Fig. 18. Open vent position and pipework.
Fig. 16. Layout of components with expansion vessel in service position.
Central Heating
Flow Valve
Central Heating
Return Valve
Pressure Relief
Valve
By-pass Adjusting
Screw.
Turn clockwise
to close
Manual Air
Vent
Fig. 17. Central heating flow and return valves,
by-pass adjustment, pressure relief and
manual air vent.
1
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
2
3
4
5
6
7
8
1. Facia.
2. Control box.
3. Inner casing cover fixing screws (4).
4. Expansion vessel fixing screw.
5. Expansion vessel flexible hose.
6. Pressure gauge.
7. Expansion vessel hinge.
8. Expansion vessel.
9. Heat bank.
10. Tank temperature sensor.
11. Unvented system thermostat.
12. Domestic water drain cock.
13. Gas service cock.
14. Gas valve.
15. Water diverter valve.
16. Pump.
17. By-pass adjustment screw.
18. Relief valve.
19. Primary manual air vent.
20. Central heating flow valve.
21. Central heating return valve.
22. Hot water sensor.
23. Mains cold water inlet valve.
24. Flue gas sample point.
RESTRICTOR RINGS.
Flue Restrictor Rings are supplied with the hardware pack. A
restrictor ring must be fitted into the flue terminal, the size will
depend on the length. Refer to the following table for restrictor size
and usage. When fixing the flue restrictor ring refer to Fig. 24.
NOTE: Restrictor rings must NOT be used in flue systems
incorporating two or three bends, i.e. Flue Options 5, 6, 7 and 8.
See Section 11 for parts identification and part numbers.
Flue Flue Length or Flue Restrictor
Option Total Straight Flue Size mm (dia.)
Length (mm)
1 100 to 1000 72
2 100 to 1000 75
3 1000 to 3000 75
4 1000 to 3000 77
5 100 to 2300 Not required
6 100 to 2300 Not required
7 100 to 1000 Not required
8 100 to 1000 Not required
24