Grant 50/70 - Pipework Materials; Boiler Components - System Models

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Grant Vortex Indoor/Utility, System and Boiler House Oil Boilers
Pipework materials
4.16
4 - GENERAL BOILER INFORMATION
Boiler components - System models
4.17
General - Grant boilers are compatible with both
copper and plastic pipe. Where plastic pipe is used it
must be of the oxygen barrier type and be of the
correct class (to BS 7291:Part 1:1990) for the
application concerned.
IMPORTANT: The first metre of pipework
connected to both the heating flow and return
connections of the boiler must be made in copper on
all types of system - sealed or open-vented.
Sealed systems - If plastic pipe is to be used, the
installer must check with the plastic pipe manufacturer
that the pipe to be used is suitable for the temperature
and pressures concerned. Pipe must be Class S to BS
7291: Part 1:1990.
Fig. 15 System components
External connection
• into an external soil stack
• into an external drain or gulley
• into a rainwater hopper (that is part of a combined
system where sewer carries both rainwater and foul
water)
• purpose made soakaway
All condensate disposal pipes MUST be fitted with a
trap - whether they are connected internally or
externally to a domestic waste system/soil stack or run
externally to a gully, hopper or soakaway.
Vortex 50/90
Pressure
relief valve
Automatic
air vents
Pump
Heating flow
Heating return
Pump isolating
valves
Vortex 90/120, 120/155
Pressure
relief valve
Automatic
air vents
Pump
Heating flow
Heating return
Pump isolating
valves
General requirements
5.1
The system should incorporate a low-pressure switch
to shut off power to the boiler if the system pressure
drops below 0.2 bar. A suitable low pressure switch kit
is available from your local stockist.
Underfloor systems - Plastic pipe may be used on
Underfloor systems where the plastic pipe is fitted
after the thermostatic mixing valve. Copper tube must
be used for at least the first metre of flow and return
primary pipework between the boiler and the
underfloor mixing/blending valves.
When in condensing mode the Grant Vortex boilers
produce condensate from the water vapour in the flue
gases. This condensate is slightly acidic with a ph value
of around 3 (similar to vinegar). Provision must be made
for the safe and effective disposal of this condensate.
Condensate can be disposed of using one of the
following methods of connection:
Internal connection (preferred option)
• into an internal domestic waste system (from
kitchen sink, washing machine, etc.)
• directly into the soil stack
5 - CONDENSATE DISPOSAL