andrews 32/143 Installation Manual, Operation And Service Manual page 13

INSTALLATION
1. This flue run
must not be used
*A minimum of 600mm of vertical flue directly above the draught diverter should be
provided where possible on all natural draught flue installations. If this dimension cannot
be achieved please contact Andrews Water Heaters. Please note this is not required
where a common flue header is used on multiple installations.
Fig 5.
Common flues may be used on multiple installations only if all the heaters are of the
same burner system and fuel type and should be sized to ensure complete evacuation of
the flue products from the installation.
Where one flue is to be used more regularly or for longer periods than the others in the
group, it should be connected at the point nearest to the main flue. See BS 6644 Clause
20 for further information and recommendations on this as well as general flue
requirements.
Heater with
highest usage
fitted nearest to
main flue
(if applicable)
Fit a flue clip or flange joint close to the diverter so that it is secure but can be
disconnected for servicing. The weight of the flue must be borne by securing clips, etc.
and not by the heater.
Split Flue Clip
2 & 3 are recommended flue runs
13
SECTION 3
FLUE
SYSTEMS
Fig 4b.
Each unit has an
atmospheric
burner system &
uses natural gas.
Fig 5.