General Notes And Care Of Your System; Electricity Supply; To Re-Pressurise The System By Adding Water - Grant Combi 70 V3 User's Installation Manual

3 - COMBI V3, COMBI MAX and VORTEX COMBI USER INSTRUCTIONS
The expansion vessel air charge must be checked
annually. Failure to maintain an adequate air
charge in the vessel may invalidate the warranty.

To re-pressurise the system by adding water:

1 Only add water to the system when it is cold and
the boiler is off. Do not overfill.
2 Ensure the flexible filling loop is connected and that
the shut off valve connecting it to the boiler is open
and the double check valve at the front is closed.
A valve is open when the operating lever is in line with
the valve, and closed when it is at right angles to it.
3 Gradually open the double check valve on the front
of the filling loop until water is heard to flow.
4 Vent each radiator in turn, starting with the lowest
one in the system, to remove air.
7 Continue to fill the system until the pressure gauge
indicates the required pressure between 0.5 and
1.0 bar. Close the fill point valve.
9 Close the valves either side of the filling loop and
disconnect the loop.
The temperature of the water leaving the boiler to the
radiators can be increased by turning the boiler
(heating) thermostat (see Fig. A or B) clockwise.
With the Heating switch set to TIMED, the boiler will
provide central heating whenever the timer is in an 'on'
period and the room thermostat (if fitted) is calling for heat.
For summer time operation, when central heating is not
required, set the Heating switch (see Fig. A) to HOT
WATER ONLY, or OFF for Vortex Combi (see Fig. B).
3.6

General notes and care of your system

1 Boiler controls - Refer to Section 2.2 or 3.2.
2 Pressure switch - If the heating system water pressure
falls below 0.2 bar the boiler low pressure cut-out switch
will activate and an amber light will illuminate. The
system must be recharged to between 0.5 and 1 bar. If the
heating system loses pressure on a regular basis then
contact your Installer to investigate the cause.
3 Burner Lock-out reset button - If there is a burner
malfunction, a built-in safety circuit switches the
burner off and the Lock-out reset button will light.
Usually such malfunctions are short lived and pressing
the reset button will restore normal operation.
If the burner continually goes to 'Lock-out' a fault
exists or the fuel supply is low. If you have sufficient
fuel, you will need to call your Service engineer.
4 Overheat thermostat - Your boiler is fitted with a
safety overheat thermostat which will automatically
switch off the boiler in the case of a control malfunction
causing overheating. A red neon (see Fig. A or B) will
light indicating the thermostat has operated.
Combi V3, Combi Max and Vortex Combi models
If your boiler goes off and you try to light it but
nothing happens and the 'Lock-out' reset button on the
burner is not lit, the overheat thermostat has probably
operated. The boiler will not light until the thermostat
is reset. To reset, unscrew the small plastic cap (see
Fig. A or B), press the button then replace the cap.
Note: You may have to wait for the boiler to cool
down before the button will reset. If this condition
continually repeats, contact your Service engineer.
5 Ventilation - Always ensure that the boiler has
adequate ventilation. Any ventilation openings
provided by the Installer must not be obstructed.
Periodically check that they are clear.
Do not attempt to 'box in' the boiler or build a compartment
around it before consulting your Installer.
Do not place any combustible material around or
on the boiler or flue pipe.
6 Flue terminal - The flue terminal on the outside
wall must not be obstructed or damaged.
In severe conditions check that the terminal does
not become blocked by snow.
7 Frost protection - Your Installer may have fitted a
frost thermostat. If not, and you are likely to be away
for a short time, leave the boiler on with the boiler
thermostat set at a low setting. For longer periods the
boiler and system should be drained. Contact your
Service engineer for draining and filling the system.
8 Cleaning and servicing - Lightly wipe over the
case with a damp cloth and a little detergent. Do
not use abrasive pads or cleaners.
You should have your boiler serviced at least once
a year to ensure safe and efficient operation.
Contact your Service engineer for further details.
9 Failure of electricity supply - If the electricity
supply fails, the boiler will not operate. It should
relight automatically when the supply is restored.
Note: The time on the internal 7-day or 24-hour
timer may need to be reset after a power failure.
3.7

Electricity supply

The boiler requires a 230/240 V ~ 50 Hz supply. It
must be protected by a 5 Amp fuse.
Warning: This appliance must be earthed.
3.8 Important
The section of any worktop (if fitted) above the boiler
must be removable to provide access for servicing for
the Combi 70 V3 and Vortex Combi 36.
The Combi 90 V3, Combi Max and Vortex Combi 26
boilers can be serviced from the front, but it is
preferable for any worktop above the boiler to be
removable to provide the best access for servicing.
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