28
Grant Vortex External Module
6 - BOILER INSTALLATION
5 Fit the vessel support bracket to the bottom two studs
of the combustion door and refit the nuts and washers.
Tighten to ensure an adequate seal is made.
6 Position the 16 litre expansion vessel onto the
support bracket in front of the boiler combustion
door locating the top of the vessel behind the
control panel first.
7 Screw in the locking screw on the base of the
bracket to secure the vessel in place.
8 Fit the ¾” BSP connection of the flexible
expansion vessel hose to the vessel using the black
rubber washer supplied and tighten the nut.
Sealed system kit - 90/120 and 120/155
6.5c
Fig. 20 - Sealed system pump assembly
Automatic air vent
Flow connection
on top of boiler
Compression elbow
Front of boiler
9 Fit the 28 mm compression elbow onto the boiler
flow connection.
10 Fit the pressure relief valve and automatic air vent
onto the manifold pipe. Then fit the manifold pipe
end into the 28mm compression connector on the
boiler flow pipe.
11 Fit both 28 mm pump valves to the circulating
pump using the sealing washers supplied.
12 Fit the pump assembly to the automatic air vent/
pressure relief valve assembly ensuring that the
pump shaft is horizontal and the pump motor is
facing towards the front of the boiler. The flow
arrow on the body of the pump must face in the
direction of flow away from the boiler connection.
13 Fit the pressure relief valve discharge pipe to the
pressure relief valve using the nut and olive
supplied. Route the discharge pipe through the slot
in the base of the right hand side panel. Push the
panel insulation back to expose the slot.
14 The circulating pump may be wired into the boiler
control panel if required. Refer to Section 10.
The expansion vessel fitted is supplied with a charge
pressure of 1.0 bar (equivalent to a max. static head of
10.2 metres). The charge pressure must not be less
than the actual static head at the point of connection.
Do not pressurise the vessel above 1.5 bar.
The air pressure in the vessel must be checked annually.
The central heating system volume, using the expansion
vessel as supplied, must not exceed the recommended
volumes. If the system volume is greater, an extra
expansion vessel (complying with BS 4841) must be
fitted as close as possible to the central heating return
connection on the boiler. The charge pressure of the extra
vessel must be the same as the vessel fitted in the boiler.
Refer to BS 7074:1 for further guidance.
The air charge pressure may be checked using a tyre
pressure gauge on the expansion vessel Schraeder
valve. The vessel may be re-pressurised using a
suitable pump. When checking the air pressure the
water in the heating system must be cold and the
system pressure reduced to zero.
See Fig. 20
1. The kit includes the following items:
Pressure relief valve and automatic air vent
assembly
Manifold pipe
16 litre expansion vessel with flexible hose and
sealing washer
Filling loop kit
Pressure gauge(mounted on compression Tee)
7 m head circulating pump with 28 mm gate type valves
15 mm copper pressure relief valve discharge pipe
2 Remove the ½” BSP black iron plug from the front of
the boiler waterway, using a
3
/
8
" drive socket wrench.
3 Fit the ½” BSP straight end of the flexible
expansion vessel hose to the tapping on the front of
the waterway using a suitable thread sealant.
4 Remove the nuts and washers from the boiler
combustion door.
Sealed system expansion vessel pressure
6.6
To Next Page
Loading...
