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4.5
Condensate discharge
Full details on condensate discharge.
▶ Follow the latest version of BS6798 and HHIC
guidance.
For correct installation and trouble free operation of the appliance the
following advice should be followed:
1. To minimise the risk of freezing, wherever possible, the
condensate drain should be installed internally.
2. All condensate pipework must 'fall' from the appliance by a minimum
of 3 ° (52mm per metre) to ensure adequate condensate flow.
3. The pipework route must allow air to be supplied back to the
appliance for correct operation of the condensate trap.
4. Connection to a rainwater down pipe must include an air break.
Also:
• Assessment of the risk of the condensate pipe freezing must be
carried out and appropriate precautions taken where necessary. This
must take into account the specific site conditions.
• The condensate pipework connected to the condensate drain outlet
on the appliance should have a minimum internal diameter (ID) of
19mm.
• Keep external pipework as short as possible.
Further precautions against freezing must be taken if external pipe
runs exceed 3m.
• External pipework should be increased to a minimum internal
diameter (ID) of 30mm 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.
• The condensate pipework shall be run in polypropylene (PP).
4.5.1
Condensate pipe work
NOTICE: General considerations
▶ Where a new or replacement appliance is being
installed, access to an internal "gravity discharge"
point should be one of the factors considered in
determining boiler location.
▶ Condensate pipe connection at the appliance:
The plastic condensate pipe must have a nominal
outside diameter 22mm Ø .
▶ Ensure there are no blockages in the pipe run.
▶ Ensure that the discharge method for the installation
can effectively handle the condensate waste from the
appliance.
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 and consideration should be given to using a
CondenseSure siphon..
4.5.2
Condensate production
When the appliance is in operation it can produce between 10 to 15
litres of condensation per hour.
4.5.3
Internal connections
Good practice
▶ The following guidance indicates the good practices
that must be maintained for the Installation and
Maintenance of a product.
Greenstar Heatslave II
2022 +
6 721 843 978 (2022/01)
Soil stack connection
figure 11
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.
1
2
Fig. 11 Disposal to soil vent stack
[1]
Condensate discharge from appliance
[2]
Soil and vent stack
[3]
Minimum 450mm and up to three storeys
Waste pipe connection
figure 12
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 and that the condensate drain enters into the top of the
pipe using a swept tee.
1
1
Fig. 12 Disposal to a waste pipe
[1]
Condensate discharge from the appliance
[6]
75mm sink waste trap
Pre-Installation
3
75mm
6
min.
75mm
6
min.
15
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