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4.5
Condensate discharge
For correct installation and trouble free operation of the appliance the
following advice should be followed:
1. All condensate pipework must 'fall' from the appliance by a minimum
of 3 degrees (52mm per metre) to ensure adequate condensate
flow.
2. The pipework route must allow air to be supplied back to the
appliance for correct operation of the condensate trap.
3. Connection to a rainwater down pipe must include an air break.
Also:
• Keep external pipework as short as possible and not exceed 3 metres
length.
• External pipework should be increased to a minimum diameter of
32mm and ideally be insulated.
• Minimise the number of bends and connectors.
• Remove burrs after cutting pipe.
• Remove surplus solvent from the interior of the pipe.
4.5.1
Condensate pipe work
Follow HHIC guidance and recommendations for
condensate disposal
NOTICE:
▶ Where a new or replacement boiler is being installed,
access to an internal "gravity discharge" point should
be one of the factors considered in determining
boiler location.
▶ The condensate pipe must be nominally
21.5mm Ø polypropylene pipe.
▶ The condensate pipe work must fall at least 52mm
per metre towards the outlet and should take the
shortest practicable route.
▶ Ensure there are no blockages in the pipe run.
NOTICE: Unheated internal areas.
The condensate discharge may freeze in areas during
prolonged cold temperatures.
▶ Internal pipe runs in unheated areas such as lofts,
basements and garages should be treated as external
runs.
Key to condensate illustrations, figures 12, 13, 14 & 15
1
Condensate discharge from boiler
2
Soil and vent stack
3
Minimum 450mm and up to three storeys
4
Visible air break at plug hole
5
Sink or basin with integrated overflow
6
75mm sink waste trap
7
Condensate pump
Table 5 Key to Internal condensate disposal methods
Greenstar Danesmoor Utility
2022+
and Utility System
4.5.2
In order to minimise risk of freezing during prolonged cold spells, the
following methods of installing condensate drainage pipe should be
adopted, in order of priority.
Wherever possible, the condensate drainage pipe should be routed and
terminated so that the condensate drains away from the boiler under
gravity to a suitable internal foul water discharge point such as an
internal soil and vent stack. A suitable permanent connection to the foul
waste pipe should be used.
Fig. 13 Disposal to soil vent stack
Alternatively if the first option is not possible an internal kitchen,
bathroom or washing machine waste pipe etc. can be used.
Ensure that the condensate drain pipe is connected "down stream" of
the waste trap.
Fig. 14 Disposal to a waste pipe
CONDENSATE PUMP
Where "gravity discharge" to an internal termination is not physically
possible, or where very long internal runs would be required to reach a
suitable discharge point, condensate should be removed using a
proprietary condensate pump, of a specification recommended by the
boiler or condensate pump manufacturer.
The pump outlet pipe should discharge to a suitable internal foul water
discharge point such as an internal soil and vent stack or if not possible
to internal kitchen, bathroom or washing machine waste pipe etc. A
suitable permanent connection to the foul waste pipe should be used.
Fig. 15 Condensate pump disposal
2022+
- 6 721 846 263 (2022/01)
Internal connections
1
2
21.5mm Ø
1
21.5mm Ø
6
1
21.5mm Ø
1
21.5mm Ø
7
Pre-Installation
3
5
75mm
min.
5
75mm
min.
6
2
3
15
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