Grant Vortex Eco Series, User Instructions

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Page 7
3 CARING FOR YOUR
BOILER
3.1 CHECKING SEALED SYSTEM
PRESSURE
If your boiler is operating on a sealed system, your installer will
have pressurised the system and should have told you (or set
it on the pressure gauge*) the system pressure when cold. This
pressure is normally between 0.5 and 1.0 bar, which will increase
slightly when the system is hot.
*Your installer should have shown you where the system pressure
gauge is located.
Figure 3-1: Pressure gauge during normal boiler operation
You should frequently check that the system pressure is correct.
If the pressure (when the heating system is cold) is below the set
pressure mentioned above, you can re-pressurise the system by
following the instructions given in Section 3.2.
If the system requires re-pressurising frequently, ask your installer
or service engineer to check the heating system for leaks and to
check the expansion vessel air charge.
AIR VENTS
The boiler and/or system will be fitted with an air vent to remove
air from the system.
Any air trapped in the radiators should be removed by venting the
radiators using the vent screw at the top of each radiator. Only
vent a radiator if the top is cool and the bottom is hot. Excessive
venting will reduce the system pressure, so only vent when
necessary and check the system pressure as mentioned above.
Re-pressurise the system if necessary.
PRESSURE RELIEF (SAFETY) VALVE
The sealed system will be fitted with a safety valve to release
excess pressure from the system. If water or steam is emitted
from the safety valve discharge pipe, switch off the boiler and
contact your installer or service engineer immediately.
If a Grant Vortex Eco Wall Hung External Sealed System boiler is
fitted, this safety valve will be located inside the boiler casing.
0
1
2
3
4
Normal Operating
Pressure** Range
**This is the
pressure inside
the heating
system while the
system is hot.
3.2 HOW TO FILL OR TOP UP YOUR
SEALED SYSTEM
(filling loop)
Figure 3-2:
Sealed system filling loop arrangement
To fill or top up your heating system, proceed as follows:
1. Check the boiler and circulating pump are switched off and
any air vents on the system are open.
2. Connect the filling loop* between the two filling valves.
3. Open the filling valve on the mains water end of the filling
loop (the valve is open when the operating lever is in line with
the valve).
4. Open the filling valve on the heating end of the filling loop to
allow water to flow into the heating system (the valve is open
when the operating lever is in line with the valve).
5. When the pressure gauge shows the required cold system
pressure (refer to Section 3.1) close the filling valve on the
heating system.
6. Vent each radiator to remove any air that may be trapped
in them. Start with the lowest radiator in the system, i.e
downstairs.
7. Locate the circulating pump(s) and vent the pump(s) by
following the manufacturer’s instructions.
• If a Grant Vortex Eco Wall Hung External Sealed
System boiler is fitted to the boiler, refer to Appendix
A1 or A2 (as appropriate) at the back of the boiler’s
installation and servicing instructions for the pump
venting procedure.
8. Now, check the system pressure on the system pressure
gauge. If necessary, re-open the filling valve on the system
until the gauge shows the required pressure. Take care not
to over-fill!
9. Finally, close both filling valves and disconnect the filling loop
at one end only. Take care, as the filling loop may contain
water!
*If you cannot locate the filling loop, please contact your installer.
! NOTE !
If the system has been drained down or requires frequent
topping up, then the level of inhibitor and/or anti-freeze will
need to be checked by your installer.
! WARNING !
Only add water to the system when the system is cold and
the boiler is switched off.
Do not overfill
Section 3: Caring for your Boiler