Table of Contents
Advertisement
PRE-INSTALLATION
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
22mm Ø
Fig. 9 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.
1
22mm Ø
7
Fig. 10 Condensate pump disposal
4.4.4
External connection considerations
NOTICE: Rainwater 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 it the down pipe or
external drain is connected to a combined foul and
rainwater system
▶ Refer to BS 6798 for more information
NOTICE: Grey water systems
Contamination of recovered water
▶ Condensate disposal shall not be allowed into a grey
water recovery system that is intended for re-use
NOTICE: Freezing conditions
▶ Pipe work length should be kept to a minimum and the
route as vertical as possible.
▶ When required, use only weather proof insulation.
14
22mm Ø
5
75mm
6
min.
5
75mm
min.
6
2
3
NOTICE: Condensate waste
▶ Care should be taken when siting a soak-away to avoid
obstructing existing services.
Continued - Key to condensate illustrations, figures 9, 10, 11 & 12
8
45° Connector
9
100mm Ø minimum plastic pipe
10
Drainage holes
11
Limestone chippings
12
Bottom of sealed tube
13
Insulate and increase pipe size
14
Pipe work transition
15
External air break
16
Air gap
17
External rain water pipe into foul water
18
45° Bend
Table 10 Key to external condensate disposal methods
Condensate drainage pipe can be run above or below
ground. If the pipe work is run under ground, care must
be taken to ensure that the pipe work "fall" towards the
disposal point is maintained
If no other discharge method is possible then the use of an externally run
condensate drainage pipe terminating at a suitable foul water discharge
point, or purpose-designed soak away, may be considered. If this
method is chosen then the following measures should be adopted:
▶ Use a CondenseSure siphon to help prevent the condensate freezing.
▶ The external run be kept as short as possible and not exceed 3
metres.
▶ The pipe should be run internally as far as possible before going
externally and the pipe diameter should be increased to 32mm
before it passes through the wall to the exterior. The pipe should be
insulated using suitable waterproof and weather resistant insulation,
if not using a CondenseSure siphon.
▶ The external pipe should take the shortest and least exposed route to
the discharge point, and should "fall" as steeply as possible away
from the boiler, with no horizontal runs in which condensate might
stand.
▶ The use of fittings, elbows etc. should be kept to a minimum and any
internal "burrs" on cut pipe work should be removed so that the
internal pipe section is as smooth as possible.
FITTING AN EXTERNAL AIR BREAK
• Refer to figure 11 when a rain water down pipe is used to dispose of
condensate.
• An air break must be installed in the 43mm pipe work, between the
boiler condensate outlet and the drainpipe, outside the property, to
avoid flooding during adverse weather conditions.
1
22mm Ø
8
Fig. 11 Disposal into a rainwater down pipe
Where the pipe terminates over an open drain or gully, the pipe should
terminate below the grating level, but above water level, in order to
minimise "wind chill" at the open end.
Greenstar Ri
10
9
11
12
13
14
ErP
- 6 720 813 283 (2016/07)
Advertisement
Table of Contents
