Conventional Flue System - Vortex Combi; Typical Conventional Flue With Brick Chimney - Grant Combi 70 V3 User's Installation Manual

7 A sealed cleaning door must be provided near the
base of the flue.
8 The exposed flue pipe between the boiler and the
chimney must not be of an asbestos material and
aluminium must not be used in any part of the flue.
9 If the draught conditions are satisfactory, the flue
should terminate with a standard cowl. Where the
flue cannot terminate above the ridge of the roof,
use an 'OH' or similar type cowl where
downdraughting occurs.
Ridge vent terminals must not be used.
10 Refer to the locally applicable Building
Regulations, BS 5410:1 and OFTEC Installation
Requirements (Books 2 and 3) for further guidance
on conventional flue systems.
11 To allow for flue gas analysis and combustion
testing, a test point is provided in the boiler
cleaning door - Combi 90 V3 and Combi Max -
and on top of the Combi 70 V3 boiler .
5.7

Conventional flue system - Vortex Combi

Under no circumstances can Grant Vortex Combi boilers be installed with existing flue systems. Only flue
systems and components suitable for wet flues should be used.
Failure to install the correct type of flue system will invalidate the warranty.
See Figs. 13 and 14
Care must be taken to ensure the flue system is suitable
for the very low flue gas temperatures and condensate in
the flue gases - suitable conventional flue systems (Orange
system) are available from Grant UK - see Fig. 13 and
page 24.
22
5 - GENERAL BOILER INFORMATION
Fig. 12 - Typical conventional flue with brick chimney
Combi V3, Combi Max and Vortex Combi models
1 The flue must terminate in a down draught free area,
i.e. at least 600 mm above the point of exit through the
roof or preferably above the ridge level.
2 The condensate may be allowed to run back into
the boiler. A condensate drain at the base of the
flue system is not required.