Condensate Drain Pipe; Connecting The Flue System To The Boiler; Electrical Connection; General Requirements - Vaillant ecoTEC PLUS SERIES Installation And Maintenance Manual

4 Boiler installation sequence
4.11

Condensate drain pipe

4
a b
3 3
Internal Internal
stackpipe discharge system
Fig. 4.12 Installing the condensate drain pipe (picture shows
ecoTEC 800 plus)
The ecoTEC plus appliances are fitted with a surge
siphon. The surge siphon collects the accumulated con-
densate in a container of approx. 200 ml capacity and
directs the entire content in a surge into the drain pipe.
The risk of the condensate drain pipe freezing is thus
minimised.
The ecoTEC pro appliances are equipped with a normal
condensed water siphon where the accumulated conden-
sate is constantly directed into the drain pipe.
• Connect the boiler condensate drain (1) to a conden-
sate discharge pipe (2) which should be minimum of
19 mm internal diameter (22 mm external diameter for
any pipework installed external to the property) and
be made of an acid resistant material (e.g. plastic over-
flow pipe).
Note
The discharge pipe from the boiler condensate
drain must have a continuous fall (45 mm per
meter) and preferably be installed and terminat-
ed within the building to prevent freezing.
The condensate discharge pipe must terminate in a suit-
able position, e.g.:
a) preferably the discharge pipe should run and termi-
nate internally to the house soil and vent stack (at
least 450 mm above the invert of the stack). A trap
giving a water seal of at least 75 mm (3) should be
incorporated into the pipe run, and there must be an
air break (4) in the discharge pipe upstream of the
trap. This should be designed so that the condensate
cannot be discharged into the house if the condensate
pipe becomes blocked.
22
1
2
c d
6
5 7
Gulley Soakaway
b) connecting into the internal discharge branch (e.g. sink
waste or washing machine) with an external termina-
tion, the condensate discharge pipe should have a
minimum diameter of 22 mm with no length restriction
and should incorporate a trap with a 75 mm (3) seal.
The connection should preferably be made down
stream of the sink waste trap. If the connection is only
possible upstream, then an air break is needed
between the two traps. This is normally provided by
the sink waste.
c) terminating in a gully (5) below grid level (6) and
above the water level. The external pipe length should
be kept a short as possible to minimise the risk of
freezing and should not be more than 3 m.
d)at a condensate absorption point (soakaway) (7). The
external pipe length should not be more than 3 m.
Refer to 'BS 6798 Specification for installation of gas–
fired boilers of rated input not exceeding 70 kW net' for
further information. Before operating the boiler the con-
densate trap (1) must be filled with water as described in
relevant section.

4.12 Connecting the flue system to the boiler

• Refer to separate air/flue duct installation instructions
included with the boiler.

4.13 Electrical connection

4.13.1 General requirements

Danger!
Electroculation caused by touching live parts
can be fatal.
Before working on the appliance, turn off the
power supply and secure against restart.
All electrical work shall be carried out by a competent
person and shall comply with BS7671 (IEE Regulations).
In IE, reference should be made to the current edition of
the ETCI rules. The boiler is supplied for connection to
230 V, ~ 50 Hz supply fused at 3 A rating. Connection to
the mains supply shall be made via a fused 3 pin plug to
an unswitched shuttered socket, both complying with
the requirements of BS1363.
(Alternatively, connection may be made via a 3 A fused
double pole isolator having a contact separation of at
least 3 mm in all poles and supplying the boiler and con-
trols only). The point of connection to the mains supply
must allow complete electrical isolation of the boiler and
its ancillary controls. It should be readily accessible and
adjacent to the boiler. A 3 core flexible cord according to
BS6500 tables 6, 8 or 16 (3 x 0.75 to 3 x 1.5 mm
be used.
Danger!
This appliance must be earthed.
Installation and maintenance manual ecoTEC
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) should