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Condensate drainage for air conditioning systems
Condensate drainage using a self sealing device
Note this technical solution is in addition to previously
published technical solutionsrelating to split system installation
and condensate drainage methods and may also beused for
applications such as high efciency ducted heaters and evaporative
coolers.
40mm upvc pipe
40mm upvc pipe
Flow
Flow
Adaptor
Adaptor
Fig. 1 Self sealing device
Fig. 2 Via a discharge pipe beneath a sink, trough or vanity
basin
A self sealing device is, in effect, awaterless trap which is
designed to closeafter waste discharge and prevent theadmittance of
foul air into the building.It offers the advantage, in the case
ofcondensate drainage, of continuing toprevent foul air entry
during times oflittle or no ow when a conventionalwater trap seal
may evaporate.
The device is designed for 40mmupvc pipe and can be installed in
thevertical or on grade position but must
be within a building, accessible and outof direct sunlight. An
adaptor tting(available from the manufacturer, orregular ttings)
may be required for theupstream end of the valve to providefor the
connection of 40mm pipe or atundish. (See g.1 opposite.)
Permitted locations
1(a) Via the discharge pipe beneath asink, trough or vanity
basin.
A junction and device is installedby the sanitary plumberin the
verticalsection of discharge pipe (50mm or40mm) below the trap seal
of the xtureand the self sealing device is installed inthe vertical
position as high as is practicalto the underside of the benchtop.
Thedischarge pipe, device and condensatedrain must be adequately
supported. Atundish is required on the top of thedevice to provide
a physical air gap(20mm) in the condensate drain. (See
g. 2 opposite.)
Airgap
Self sealingdevice50mm or 40mm
fixture dischargepipe
Drain
40mmdischarge
pipe
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Condensate drainage for air conditioning systemsCont.
Permitted locations cont.
40mmdischargepipe
Vent
Ceiling space
Tundish
Self sealing device
Air gap
Drain from air conditioning unit
1(b) Via a dishwasher connection point on aDN 50mm xture
trap
Fig. 4 To a vent in a ceiling space vertical position
40mmdischargepipe
Vent
Ceiling space
Tundish
Self sealing device
Air gap
Drain from air conditioning unit
Fig. 5 To a vent in a ceiling space on grade
Alternatively the drain may discharge
to the dishwasher connection point ona 50mm xture trap using
appropriateexible hose and ttings providing all theconditions
described in 1(a) can be met.(See g. 3 opposite.)
2. Waste or vent in a roof / ceiling space.
The condensate drainage from an airconditioning or heating
appliance maybe discharged to a vent pipe via a selfsealing device
located in a ceiling or roofspace. The junction and device is to
be
installed by the sanitary plumberandmust be supported in
accordance with AS3500. It is preferable for the device to
beinstalled in the vertical position with an airgap provided over a
tundish. (See g. 4opposite.)
If it is not practical to install the devicein the vertical
position, it is acceptable inan on-grade position as long as a
tundishincorporating an air gap is provided. (Seeg. 5 below,
opposite.)
In the case of ceiling space
installations, test the system under fulloperating conditions to
ensure there is nosplashing or spillage from the tundish onto the
ceiling.
Airgap
Self sealing
device
Flexible hose50mmfixture dischargepipe
Drain
Dishwasher connection
50mm fixture trap
Fig. 3 Dishwasher connection point on a DN 50mm xture trap
