Water Connections; Condensate Trap And Siphonic Drain; Connection - Vaillant ecoTEC plus Instructions For Installation And Servicing

4 Boiler installation sequence
Note!
h
Ensure the gas supply pipe work is adequately
sized so that a 20 mbar gas pressure is availa-
ble at the boiler inlet at full flow rate.
• Tighten all connections.
• Check the gas connection with leak indicator
spray for leakage.
The gas supply can be connected from below, or
through the wall at the rear of the boiler. See fig 4.5.
and refer to section 3.4. The whole of the gas installa-
tion, including the meter, should be inspected, tested for
soundness and purged in accordance with the current
issue of BS6891 and in IE the current edition of I.S.813
"Domestic Gas Installations".
union
cennector
gas supply in
internal 3
stack pipe
4
gulley 6
5
Fig. 4.5 Gas and condense connections

4.3.4 Water connections

a Caution!
When making final connection to the boiler use
the compression fittings supplied to avoid dam-
age through heat transfer.
Return
Fig. 4.6 Water connections
20
condensate
trap
spigot
1 coupling
2 condensate
drain pipe
a b
3
internal
discharge
system
c
d soakaway
22 mm compression
is the recommended
fixing for servicing.
Flow
Provision is made for the water connections to be made
from above the boiler, see fig 4.6 (using the two 22 mm
compression couplers supplied). The position is shown
on the wall template. Flush out the domestic hot water
and the heating systems before connecting to the boiler.
4.3.5 Condensate trap and siphonic drain connection
The condensate drain pipework must have a continuous-
fall (45 mm per metre) and should whenever possible
terminate at a suitable drain point within the heated en-
velope of the building that will remain frost free under
long periods of low external temperatures.
• During installation remove all burs from inside of cut
pipe work and avoid excessive adhesive which may
trap small pockets of water close to the pipe wall
which can freeze and build into a larger ice plug.
• As with other pipe work insulate the condensate dis-
charge pipe to minimise any risk of freezing and be-
ware when crossing cavities that the fall is maintained
and the pipe sleeved.
Refer to fig 4.5. The condensate drain connection is at
the underside rear of the boiler. The condense drain is
suitable for use with standard overflow pipe and cou-
plings do not use adhesive when connecting to the spig-
ot (1) The condense drain pipe (2) should be plastic. The
condensate is discharged periodically in 'slugs' by si-
phonic action. It is not necessary to provide air breaks
or extra traps in the discharge pipe as there is already a
75 mm high trap inside the boiler. Fitting an extra trap
may cause the boiler siphon to work incorrectly. Refer
to BS5546 or BS6798 for advice on disposal of boiler
condensate.
(a) Preferably the drain pipe should run and terminate
internally to the house soil and vent stack at least
450mm above the invert of the stack.
(b) Connecting into the internal discharge branch
(e.g. sink waste or washing machine) with an exter-
nal termination, the condensate drain pipe should
have a minimum diameter of 22 mm with no length
restriction and preferably made down stream of the
sink waste trap, if the connection is only possible up
stream, then an air break is needed between the two
traps. This is normally provided by the sink waste.
(c) Termination in a gully (5) below grid level (6) and
above the water level. The external pipe length
should be kept as short as possible to minimise the
risk of freezing and should not be more than 3 me-
tres.
(d) At a condensate absorption point (soak away) (7).
The external pipe length should not be more than 3
metres.
Refer to the latest issue of BS 6798 Specification for
installation of gas fired boilers of rate input not exceed-
ing 70kW net for further information. Before operating
the boiler the condensate trap must be filled with water.
Instructions for installation and servicing ecoTEC plus 0020020828_07