2.16 CONDENSATE DRAIN
129.5
38
44
Condensate
Drain
This appliance is fitted with a siphonic 75 mm condensate
trap system that requires filling before operating the
appliance for the 1st time or after maintenance.
All condensate pipework should conform to the following:
a. Where a new or replacement boiler is being installed,
access to an internal ‘gravity discharge’ termination
should be one of the main factors considered in
determining boiler location.
b. Plastic with push fit or solvent connections.
c. Internal plastic pipe work a minimum of 19 mm ID
(typically 22 mm OD).
d. External plastic pipe must be a minimum of 30 mm
ID (typically 32 mm OD) before it passes through the
sleeved wall.
e. All horizontal pipe runs must fall a minimum of 52 mm
per metre away from the Boiler.
f. External & unheated pipework should be kept to a
minimum and insulated with Class “O” waterproof pipe
insulation through freezing or otherwise.
g. All installations must be carried out in accordance
to the relevant connection methods as shown in the
“Condensate installation diagrams” & BS6798.
h. Pipework must be installed so that it does not allow
spillage into the dwelling in the event of a blockage
(through freezing).
i. All internal burrs should be removed from the pipe work
and any fittings.
In order to minimise the risk of freezing, terminate the
condensate drainage pipe using one of the following
methods:
Internal Drain Connections
Route the condensate pipe by gravity to an internal, foul
water discharge point.
Condensate Pump
When it is not practical to terminate the condensate pipe
to an internal foul water discharge point using gravity,
use a suitable pump recommended by the boiler or pump
manufacturer.
External Drain Connections
The use of an externally run condensate drainage pipe
should only be considered after exhausting all internal
termination options as described previously. An external
system must terminate at a suitable foul water discharge
point or purpose designed soakaway. If an external system
is chosen then the following measures must be adopted:
The external pipe run should be kept to a minimum using
the most direct and “most vertical” route possible to the
discharge point, with no horizontal sections in which
condensate might collect.
-
For connections to an external soil/vent stack.Insulation
measures as described should be used.
-
When a rainwater downpipe is used, an air break must
be installed between the condensate drainage pipe and
the downpipe to avoid reverse flow of rainwater into the
boiler should the downpipe become flooded or frozen.
-
Where the condensate drain pipe terminates in a
purpose designed soakaway (see BS 6798) any above
ground condensate drain pipe sections should be run
and insulated as described above.
-
Where the condensate drain pipe terminates over an
open foul drain or gully, the pipe should terminate below
the grating level, but above water level, to minimise
“wind chill” at the open end. The use of a drain cover
(as used to prevent blockage by leaves) may offer
further prevention from wind chill.
Unheated Internal Areas
Internal condensate drain pipes run in unheated areas, e.g.
lofts basements and garages, should be treated as external
pipe.
Ensure the customer is aware of the effects created by a
frozen condensate and is shown where this information can
be found in the user manual.
Note.
Please check current HHIC condensate discharge
guidance available via the Gas Safe Registered Technical
Bulletins List.
Refer to Fig.
1 & 2
Refer to Fig.
3
Refer to Fig.
4
Refer to Fig.
5
Refer to Fig.
6
All measurements shown in mm
23
Installation and Servicing
Section 2 - Installation
INST
ALLA
TION
