Internal Connections; External Connections - Worcester GR8700iW 35 C Installation And Maintenance Instructions Manual

Condensate pipe work - Unheated internal areas
NOTICE:
Unheated internal areas.
Although the large volume siphon will reduce the risk of freezing,
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.
For additional information refer to "External Connections" section.
4.5.3

Internal connections

Soil stack connection
 Figure 29
In order to minimise risk of freezing during prolonged cold spells, the
following methods of installing condensate drainage pipe should be
adopted.
Wherever possible, the condensate drainage pipe should be routed and
terminated so that the condensate drains away from the appliance 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. 29 Disposal to soil vent stack
[1] Condensate discharge from appliance
[2] Soil and vent stack
[3] Minimum 450mm and up to 3 storeys
Waste pipe connection
 Figure 30
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.
1
1
Fig. 30 Waste pipe disposal
[1] Condensate discharge from appliance
[5] Visible air break at plug hole
[6] 75mm sink waste trap
Greenstar 8000 Style – 6720883864 (2019/02)
3
5
75mm
6
min.
5
75mm
min.
6
Condensate pump
 Figure 31
Where direct connection to a "gravity discharge" pipe work 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
condensate pump manufacturer.
• The pump outlet should discharge to a suitable "gravity discharge"
outlet.
– The condensate then flows, by gravity, through the 22mm plastic
pipe to the condensate discharge point.
8
1
7
Fig. 31 Condensate pump example
[1] Condensate discharge from appliance
[7] Condensate pump
[8] Pipe work transition
[C] Gravity discharge pipe work
Proprietary condensate pump
▶ Ensure minimum and maximum pump lifting heights are followed as
per condensate pump manufacturers instructions.
4.5.4

External connections

NOTICE:
Rainwater down pipe or external drain disposal
Untreated condensate must not be allowed to flow into streams or rivers
▶ A rainwater down pipe or an external drain shall only be used for
condensate disposal if the down pipe or external drain is connected
to a combined foul and rainwater drainage system
▶ Refer to BS 6798 for more information on condensate disposal
NOTICE:
Grey water recover system
Contamination of recovered water
▶ Condensate disposal shall not be allowed into a grey water recovery
system that is intended for re-use
External disposal considerations
NOTICE:
Freezing conditions
Frozen condensate will block the condensate drain pipe and stop the
appliance from running
▶ Pipe lengths should be kept to a minimum and the route as vertically
as possible.
Pre-Installation
Max.
C
Min.
25