Boiler Location; Water Connections; Combi V3 And Combi Max; Vortex Combi - Grant Combi 70 V3 User's Installation Manual

5.10

Boiler location

1 The boiler must stand on a surface that is firm and
level. It does not require a special hearth as the
temperature of the boiler base is less than 50°C.
2 Sufficient clearance must be allowed at the front of the
boiler to remove the burner and baffles for servicing.
3 The Combi 70 V3 and Vortex Combi 36 require a
removable section of worktop (if fitted) above the
boiler to provide access to components on top of
the boiler and for servicing.
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.
4 Vortex Combi - Care should be taken when siting
the condensate trap. See Section 5.17.
5.11

Water connections

Note: Water connections may be from the rear, left
or right hand side. If using low level side exit flue,
connections must be on the opposite side to the flue.

Combi V3 and Combi Max:

Four push-fit elbows are supplied with the boiler for
connection of the heating flow and return pipes (22
mm), cold water mains inlet pipe (15 mm) and
domestic hot water outlet pipe (15 mm) to the four
open pipe ends in the boiler. See Fig. 22.
The heating flow and return connections have been
fitted with isolation valves for maintenance.

Vortex Combi:

Flow and return connections - All models are
supplied with a push-fit elbow connection for the
heating flow and return - 22 mm (Vortex Combi 26) or
28 mm (Vortex Combi 36).
Hot water connections - All models are supplied with
push-fit elbow connections for the cold water mains inlet
pipe and hot water outlet pipe. These are 15 mm for the
Vortex Combi 26 and 22 mm for the Vortex Combi 36.
28
5 - GENERAL BOILER INFORMATION
Combi V3, Combi Max and Vortex Combi models
IMPORTANT: All pipes to be fitted into the push-fit
connectors provided should be cut using a pipe slicer or
pipe cutter - to leave the pipe ends with a slight radius and
free from any burrs or sharp edges. Pipes to be used with
these fittings should not be cut square using a hacksaw.
All models:
1 A 15 mm discharge pipe must be connected to the
safety valve outlet connection. The pipework between
the safety valve and the boiler must be unrestricted,
i.e. no valves. The discharge pipe should be run to the
outside of the building and terminate so that it cannot
cause injury to persons or property.
2 A drain tap is provided at the bottom on the front
of the boiler (and also on the hot water store on the
Vortex Combi).
To avoid the danger of dirt and foreign matter entering
the boiler the complete heating system should be
thoroughly flushed out - before the boiler is connected
and then again after the system has been heated and is
still hot. This is especially important where the boiler
is used on an old system.
For optimum performance after installation, this boiler
and its associated central heating system must be flushed
in accordance with the guidelines given in BS 7593:1992
'Treatment of water in domestic hot water central heating
systems'.
This must involve the use of a proprietary cleaner,
such as BetzDearborn's Sentinel X300 or X400, or
Fernox Restorer. Full instructions are supplied with the
products, but for immediate information, please
contact BetzDearborn on 0151 4209563 or Fernox on
0179 9550811.
For Long term protection against corrosion and scale,
after flushing, it is recommended that an inhibitor such as
Betzdearborn's Sentinel X100 or Fernox MB-1 is dosed
in accordance with the guidelines given in BS 7593:1992.
Failure to implement the guidelines will invalidate the
warranty.