34
Grant Vortex Eco Utility Oil Boilers
Sealed system kit - 15/21, 21/26 and 26/35
6.6
6 - BOILER INSTALLATION
1 The kit includes the following items:
Pressure relief valve and automatic air vent assembly
22 mm push-fit elbow
12-litre expansion vessel with flexible hose and
sealing washer
Filling loop kit - including pressure gauge mounted
on shut-off valve
6 m head circulating pump with 22 mm gate type
valves
15 mm copper pressure relief valve discharge pipe
½" BSP black iron Tee
Pump support bracket – with screw, nut & washer
2 Unscrew the burner securing nut and remove the
burner from the boiler.
3 Remove the ½" BSP black iron plug from the front
of the boiler waterway, using a 3/8" drive socket
wrench.
4 Remove the compression nut and olive from the
end of the filling loop shut-off valve. Fit the ½"
BSP straight end of the shut-off valve into one side
of the black iron tee, using a suitable thread sealant
(not supplied).
5 Fit the male thread of the black iron Tee into the
tapping on the front of the waterway using a
suitable thread sealant. Tighten until Tee (and shut-
off valve) is horizontal.
6 Connect the flexible expansion vessel hose to the
remaining connection on the black iron Tee.
7 Position the 12-litre expansion vessel on the front of
the boiler combustion door locating the vessel bracket
into cut-out in the front of the combustion door.
Note: on 15/21 and 21/26 models press on the pre-
cut section in the centre of the door to form the cut-
out for the bracket.
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.
9 Fit the pump support bracket to the vertical plate
on top of the boiler shell. Fasten in place using the
screw, nut and washer provided.
10 Push the 22 mm push-fit elbow onto the boiler flow
connection.
11 Push the automatic air vent/pressure relief valve
assembly into the push-fit elbow.
12 Fit both 22 mm pump valves to the circulating
pump using the sealing washers supplied.
13 Fit the pump assembly to the automatic air vent/
pressure relief valve assembly ensuring that the
pump shaft is horizontal, the pump motor is facing
towards the front of the boiler and the body is
resting on the pump support bracket. The flow
arrow on the body of the pump must face in the
direction of flow away from the boiler connection.
14 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.
15 The circulating pump may be wired into the boiler
control panel if required. Refer to Section 10.
16 Re-fit the burner and tighten the fixing nut to secure.
17 The filling loop should be connected, via the
double check valve, to a 15mm cold water supply
pipe from the mains at a convenient position inside
the boiler.
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.
It is recommend that the boiler should be connected to
a switched mains power supply from a programmer or
control system. Refer to Sections 10 for typical control
system wiring diagrams.
Sealed system expansion vessel pressure
6.7
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