Section 4: installation information
Page 13
4.4 Pipework Materials
The Grant Vecta boiler is compatible with both copper and plastic
pipe. Where plastic pipe is used it must be of the oxygen barrier
type and be the correct class (to BS 7291-1:2010) for the application
concerned.
On either sealed or open-vented systems; where plastic pipe is
used a minimum of ONE metre of copper pipe (or as per pipe
manufacturers instructions) MUST be connected between both the
boiler flow and return connections and the plastic pipe.
Do not connect plastic pipe directly to the boiler.
nOtE
!
Grant does not accept any responsibility for any damage, however
caused, to plastic piping or fittings.
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.
Plastic pipe must be Class S to BS 7291-1:2010.
the system MUSt incorporate a low level 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 to
purchase from Grant (product code: MPCBS63).
!
WaRninG
Underfloor Pipework
Plastic pipe may be used on underfloor floor 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.
4.5 Connections
4.5.1 Flow and return connections
Figure 4-1:
Location of flow and return connections and openings in
rear panel and base
The flow and return connections are located on the left hand side of
the boiler. Refer to Figure 4-1. Both connections are supplied fitted
with 22mm Tectite elbow connectors.
Two 150mm diameter pre-cut ‘knock-out’ openings are provided for
flow and return pipes and also the condensate disposal pipe. Refer to
Figure 4-1:
•
One is located in the lower left corner of the boiler back panel
•
The other is located in the base of the boiler
The flow and return pipes can pass downwards and then to the rear
of the boiler, through the opening in the boiler back panel and then
through the wall and into the building.
Alternatively, if required, the flow and return pipes can pass
downwards and through the opening in the base of the boiler to pass
underground and into the house.
it is nOt possible to have the flow and return pipes (or
condensate pipe) passing through either the right or left hand
side of the boiler casing.
nOtE
!
4.5.2 Condensate Connection
The boiler is supplied with the condensate trap factory-fitted. Refer
to Section 5.5. This trap is located inside the boiler casing and is
accessed by removing the side access panel on the left hand side of
the boiler. Refer to Section 1.3 for details.
Refer to Section 5 for details on the condensate disposal pipework.
4.5.3 Drain Cock
A drain cock is factory fitted to enable the draining of the boiler. This is
located at the rear of the water jacket and accessed by removing the
side access panel on the left hand side of the boiler. Refer to Figure
4-2.
To enable draining of the system, a suitable drain cock must be fitted
at the lowest point of the heating system.
Figure 4-2:
Location of drain cock (left hand side and rear panel
removed for clarity)
Flow
Return
Rear
opening
Base
opening
