Connect A Conventional Flue; Expansion Vessel; Connect The Power Supply; Vortex Combi Conventional Flue Adaptor - Grant Combi 70 V3 User's Installation Manual

Connect a conventional flue

6.5
1 Lift off the rear part of the case top.
2 Remove the insulation from the rear top panel (do
not discard it) and remove the blanking panel.
Discard the panel, retaining the nuts and washers.
3 Unscrew the protective covers from the studs on the flue
dress panel, supplied in the literature pack. Place the
panel in position in the rear case top panel and secure in
place using the washers and nuts previously removed.
Note: The first section of Vortex Combi flue must
be in single wall rigid stainless steel flue pipe
suitable for condensing boilers.
4 Combi V3 and Combi Max - Fit the flue dress
plate to the hole in the rear section of the case top.
4a Vortex Combi - Cut the insulation into three equal
pieces and replace two - either side of the flue opening
in the case top panel.
Fit the conventional flue adaptor (Part No. CFCA15/
46 not supplied with boiler) on to the neoprene gasket
around the flue outlet on top of the boiler. Secure in
position using the 40 mm stainless steel bolt supplied
with the boiler as shown in Fig. 23.
Fig. 23 - Vortex Combi conventional flue adaptor
5 Position the flue pipe into socket.
Combi V3 and Combi Max - Make good the
connection using a suitable flexible high temperature
sealant (e.g. Silastic or similar) and rope seal.
6 Position the rear section of the previously prepared
case top over the first section of the flue.
7 Replace the rear section of the case top.
6 - BOILER INSTALLATION
Combi V3, Combi Max and Vortex Combi models
6.6

Expansion vessel

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.
6.7

Connect the power supply

Important: Ensure that the electrical supply has been
isolated before commencing.
If a Grant plug-in timer is used, a permanent 230 V
mains supply (fused at 5 Amp) must be taken to the
boiler. A three core cable is required to connect the
boiler terminal block to the live supply. Refer to
Section 12 for typical control system wiring diagrams.
1 Loosen (do not remove) the four screws
securing the control panel to the side panels,
hinge the panel forward and allow it to drop down
to gain access to the rear of the panel.
2 Remove the two screws securing the terminal block
cover and lift off the cover.
3 Remove the screws securing the cable clamp and
open the clamp.
4 Connect the power supply cable to the left hand
terminal block as follows:
Brown to mains Live - terminal 3
Blue to mains Neutral - terminal 2
Green/Yellow to mains Earth - terminal 1
37