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able both to the boiler and the other appliance
when they are in use at the same time.
Pipework must be of adequate size. Pipes of
a smaller size than the boiler inlet connection
should not be used.
Installation pipes should be fitted in accord-
ance with BS 6891 and the complete installation
should be tested for tightness.
For Ireland (IE), refer to I.S.813.2002.
5.5
Air supply
The room in which the boiler is installed does
not require a purpose provided air vent.
5.6
Ventilation
If installed in a cupboard or compartment, it is
not necessary to provide additional ventilation
for cooling for this particular product. However
consideration must be given to clearance re-
quirements for maintenance (section "Precau-
tions for installation" to page 43) and under no
circumstances must stored articles be allowed
to come into contact with the boiler or flue pipe.
5.7
Condensate drain
Ensure that the condensate discharge complies
with the national or local regulations in force.
The condensate pipe must be fitted in accord-
ance with Building Regulations.
Drain pipe material should be resistant to acid
as the condensate is slightly acid with a pH less
than 6.5. The boiler includes a trap (24on page
27) that prevents the combustion products en-
tering the drain.
The boilers incorporate a condensate trap with a
75 mm seal to comply with BS 6798: 2008.
The schematic diagrams of possible connec-
tions are given in Fig. 5.2 and Fig. 5.3. The
length of the condensate pipe should be kept
to a minimum, any external pipe should not be
more than 3 m in 32 mm pipe and insulated to
prevent freezing.
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- 40 -
GENERAL REQUIREMENTS
To avoid condensate being trapped:
• the drain pipe should be run with a fall of at
least 2.5° (45 mm/m) away from the boiler;
• the number of bends and joints should be kept
at minimum.
The drain pipe should be adequately fixed to
prevent pipe sagging.
If a part of the drainpipe runs externally this part
should be kept as short as possible and protect-
ed to reduce the risk of freezing.
Connection of condensate drainage pipe to
internal soil and vent stack.
Dimensions in mm
Fig. 5.2
A Boiler
B Internal soil and vent stack
C Invert
D 450 mm up to three storeys
Connection of condensate drainage pipe
downstream of a sink waste trap
Condensate
drain
E
Dimensions in mm
Fig. 5.3
A
Condensate
drain
B
D
C
A
F
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