About Your Combi V3 Or Combi Max Boiler; Boiler Controls; Useful Tips; About Your Fuel - Grant Combi 70 V3 User's Installation Manual

1 - COMBI V3 and COMBI MAX USER INSTRUCTIONS

About your Combi V3 or Combi Max boiler

1.1
Your Grant Combi boiler is fully automatic when the
Boiler On/Off switch is set to ON, and will provide
domestic hot water at mains pressure on demand and
central heating when the boiler and heating system controls
call for it.
Your boiler may be fitted with either an internal electronic
7-day timer or mechanical 24-hour timer. Alternatively,
your installer may have fitted a separate timer, in a
convenient position remote from the boiler.
Whichever type of timer is connected to your boiler, it
will allow you to set the operating times of the central
heating. Domestic hot water is available continuously,
provided the boiler is switched on, irrespective of the
settings on the timer.
Boiler controls (see Fig. A)
1.2
To access the controls, pull off the front door from the
boiler.
1 Heating switch - When set to TIMED the boiler will
only provide central heating during the 'on' periods
set on the timer. When set to the HOT WATER
ONLY position the boiler will not provide central
heating. When set to the CONSTANT position the
boiler provides central heating continuously,
overriding all of the timer settings.
2 Boiler On/Off - This switches the boiler on and off.
Note: The timer (if fitted) will still operate with this
switch set to OFF, providing the electricity supply to
the boiler is still switched on, but the boiler will not
operate to provide domestic hot water.
3 Boiler thermostat - This control allows
adjustment of the temperature of the water leaving
the boiler to heat either the radiators or the hot
water, via the hot water heat exchanger.
The boiler thermostat has an operating range of
75°C to 85°C. For optimum hot water operation,
ensure this is set to maximum.

Useful tips

1.3
To ensure that the hot water performance is not
reduced first thing in the morning, or in the evening
if the heating is off through the day, set the heating
timer to switch the heating on at least 30 minutes
before hot water will normally be required in the
morning (or evening).
Combi V3, Combi Max and Vortex Combi models
When setting the times for the 'on' periods it is useful
to remember that it might take up to an hour for the
house to become warm, especially in colder weather.
Also the effect of the central heating will remain for a
time when the central heating is turned off.
Do not forget that if you require central heating during an
'off' period, simply set the Heating switch to CONSTANT,
remember the switch must be reset to TIMED at a later
time for the timer to return to your pre-set periods.

About your fuel

1.4
The boiler will operate on either Class C2 Kerosene or
Class D Gas Oil to BS 2869:1998. Your Installer will
have informed you of the type of fuel your boiler has
been set to use and he will have marked this on the
boiler data label. You should always quote the type of
fuel you require when ordering from your supplier.
Note: Low level balanced flue installations (flue
terminal through the wall) must only be used with
Kerosene, unless the flue terminal is higher than 2.0 m
above outside ground level.
Do not wait until the fuel runs out before you order
some more. Sludge in the bottom of the tank may be
drawn into the fuel lines. If it is possible, switch off the
boiler when the new supply is delivered and leave the
fuel to settle for an hour before restarting the boiler.
3