Boiler Installation
Information
17
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:Part1:2001.
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.
4.8 Pipe Connections
Flow and return connections:
The flow and return connection are at
the rear of the boiler (see Section 2.4)
and the sizes are as follows;
SPIRA 6-26 Flow 1” BSP Female
Return 1” BSP Female
SPIRA 9-36 Flow 1” ¼ BSP Female
Return 1” ¼ BSP Female
Drain Cock:
Fit the ½” drain cock to the bottom rear
½” BSP connection. Fit the air vent
assembly into the ½” connection on the
rear of the boiler (this is to vent the
secondary unit only), the flow pipe from
the boiler must be vented.
Condensate Connection:
The1¼” BSP female condensate outlet
connection is located at the rear of the
boiler. Refer to Section 5 for details on
condensate connection and disposal
pipework.
4.9 Wash System Manifold
The boiler is supplied with a cleaning
manifold system to wash the
condensing unit of any ash build up in
the tubes.
The wash system manifold pipe is
factory fitted through the right hand
side of the boiler. This manifold pipe
can be fitted in either one of two
different positions, depending on the
location of the pellet hopper, as follows:
With hopper located on the left side
of the boiler - the wash system
manifold if fitted from the right-hand
side of the boiler, through the holes
provided in the right hand side panel of
the boiler and both sides of the heat
exchanger chamber.
With hopper located on the right side
of the boiler - the wash system
manifold if fitted from the left-hand side
of the boiler. A semi-pierced hole
(provided in the left hand side panel of
the boiler) must be pushed out to allow
the manifold to be fitted from this side.
With hopper located between two
boilers (in a ‘double boiler’ installation)
- the right hand boiler will have the
wash system manifold fitted from the
right hand side and the left hand boiler
will have the wash manifold fitted from
the left hand side.
In all cases, ensure adequate clearance
(minimum 400mm) is present for
removal of the wash system during
servicing. Refer to Section 2.4 for
clearance dimensions.
The remainder of the washdown
cleaning system consists of the
pressure gauge and solenoid valve
assembly, flexible hose, isolating valve
(with integral check valve).
Fit the gauge/valve assembly to the end
of the manifold pipe using the 22mm
compression elbow.
Connect the mains water supply to the
15mm compression connection on the
isolating/check valve inlet. Fit the
flexible hose between the outlet of the
isolating/check valve outlet and the inlet
to the solenoid valve and leave in place.
4.10 Fan Box and Flue Starter
Fit the fan box to the flanged flue outlet
on the back of the boiler so that the flue
starter outlet is at the top.
Remove the nuts and washers from the
four studs around the fan box inlet.
With the neoprene gasket in place on
the fan box, locate the four studs
through the corresponding holes in the
boiler flue outlet flange. Secure the fan
box using the nuts and washers
previously removed.
Ensure that the fan box is vertical and
the neoprene gasket is evenly
compressed to give an adequate seal
between the fan box and the boiler
flange.
Fit the solenoid head (fitted to the same
5-way plug as the lead from the flue fan
motor) on to the solenoid valve shaft
and secure with the steel clip provided.
Fit the 5-way plug from the flue fan
/solenoid valve into the socket at the
top right rear of the boiler. Ensure that
the plug is fully pushed home. See
Figure 4-1.
On either sealed or open-vented
systems; where plastic pipe is used
a minimum of ONE metre of copper
pipe MUST be connected between
both the boiler flow and return
connections and the plastic pipe.
DO NOT CONNECT PLASTIC PIPE
DIRECTLY TO THE BOILER.
Grant UK do not accept any
responsibility for any damage,
however caused, to plastic piping or
fittings.
!
WARNING
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 UK
– Part No. MPCBS62.
Refer to Figure 8.11 for the electrical
connection details on this switch.
!
WARNING
!
NOTE
A minimum running (dynamic)
pressure of 0.8 to 1.0 bar pressure
(as shown on the gauge when the
system is operating) is required to
maintain an adequate supply for
cleaning purposes.
!
NOTE
In hard water areas an anti-scale
device should be fitted on the cold
water supply to the wash system to
prevent scale build-up in the
manifold pipe and jets.
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