Topping Up The System Pressure - Worcester Greenstar 4000 User Instructions

Prepare for operation
3.2

Topping up the system pressure

To aid in filling the system.
▶ Ensure the Central Heating is on.
Removal and replacement of bottom panel
To gain access to the filling link, remove the bottom panel.
Press in the tabs [A] and pull the bottom panel down to remove.
C
B
Fig. 4 Bottom panel
To replace the bottom panel, ensure that the tabs [B] line up with the
edges of the boiler [C] and push into place until the tabs [A] click into
place.
8
C
A
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External filling loop
Once the external filling loop and pressure menu has been located,
follow the instructions for re-pressurising the system.
Refer to figure 5.
▶ Unscrew the blanking cap [1].
▶ Attach the hose [2] to the valve.
– Usually one end of the hose is already connected to one of the
system fill isolation valves.
▶ Ensure both ends [3] of the hose are screwed on hand tight.
▶ Monitor the pressure menu.
– The system fill isolation valves [4] are in a closed position (the
handle/screwdriver slot is across the valve).
▶ Turn the handle/screwdriver slot through 90° to open valves and
slowly fill the system.
– The system fill isolation valves [5] are opened (the handle/
B
screwdriver slot is in-line with the valve).
– The pressure menu indicator moves and the displayed message
may change [6].
▶ Turn the handles/screwdriver slots back, through 90°, to close the
valves when the:
– The pressure menu reads OK and the pressure menu indicator is
in the green zone [8] .
The system fill isolation valves [7] are in a closed position (the
handle/screwdriver slot is across the valve).
▶ Top up the system pressure, if as a result of the air bleeding the
pressure drops off.
▶ Remove the hose [2] and replace the blanking cap [1].
1
7
8
System pressure ok.
Stop refilling
Pressure OK: 1.5 bar
Fig. 5 External filling loop
If the pressure gauge reads more than 1.7 bar as a result of over filling:
▶ Bleed one radiator until the pressure gauge returns to between 1 and
1.7 bar.
▶ It is good practice to bleed any excess air that has entered the heating
system due to pressure loss. Locate and open the radiator's bleed/
vent point, closing the valve when water begins to flow.
▶ If, through normal boiler operation, the PRV pipe starts to leak, it
could be a sign of system pressure being too high. In this instance
please bleed a radiator as described above.
3
2
5 4
6
Fault - 1017
System pressure
too low
Pressure: 0.6 bar
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Greenstar 4000 – 6 720 891 171 (2020/09)