General Boiler Information; Boiler Installation; Unpack The Boiler; Low Level Balanced Flue - Grant Combi 70 V3 User's Installation Manual

Radiators:-
Flow temperature
Return temperature
Differential
Underfloor:-
Flow temperature
Return temperature
Differential
6.1

Unpack the boiler

1 Carefully remove the packaging from the boiler
and remove it from the transit pallet.
2 Pull off the boiler front panel and remove the
literature pack.
3 Lift off the two parts of the case top and remove
the water connecting fittings.
6.2

Low level balanced flue

See Fig. 20 and 20a
If the boiler is to be used with a low level balanced
flue (Yellow system) make the hole in the wall for the
flue as shown in Fig. 20a.
Note: Dimension B given in Fig. 20a includes an
extra 10 mm over the size of the terminal to provide
clearance for fitting.
Fig. 20a - Low level balanced flue (Yellow system) and Starter kit (Green system)
34

5 - GENERAL BOILER INFORMATION

70°C
50°C
20°C
50°C
40°C
10°C

6 - BOILER INSTALLATION

Model
Combi V3 and Combi Max
Vortex Combi 26
Vortex Combi 36
Combi V3, Combi Max and Vortex Combi models
1 Size radiators with a mean water temperature of 60°C.
2 Design system controls with programmable room
thermostats or use weather compensating controls
to maintain return temperatures below 55°C.
The boiler should not be allowed to operate with
return temperatures of less than 40°C when the
system is up to operating temperature.
Fig. 20 - Low level balanced flue
Dimension (mm)
A
B dia C
756
127 110
768 127 115
780
162 105