Heating Connection; Heating Flow And Return Connection - Vaillant ecoTEC plus 612 Instructions For Installation And Servicing

4 Boiler installation sequence
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a b
3 3
Internal Internal
stackpipe discharge system
Fig. 4.8 Installing the condensate drain pipe (picture shows
ecoTEC plus combination boiler)
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) (built into the
boiler) should be incorporated into the pipe run, and
there must be an air break (4) in the discharge pipe
upstream of the trap. The connection to the stack
should not be made in a way that could cause cross
flow into any other branch pipe, or from that branch
pipe into the condensate drainpipe. This can be
achieved by maintaining an offset between branch
pipes of at least 110 mm on a 100 mm diameter stack
and 250 mm on a 150 mm diameter stack.
b)connecting into the internal discharge branch (e.g.
sink waste or washing machine) with an external ter-
mination, the condensate discharge pipe should have
a minimum diameter of 22 mm with no length restric-
tion and should incorporate a trap with a 75 mm (3)
(built into the boiler) seal. The connection should pref-
erably 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 nor-
mally 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 as 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.
22
1
2
c d
6
5 7
Gulley Soakaway

4.12 Heating connection

Caution!
When making final connection to the boiler, if
using soldered fittings, extra care should be
taken to avoid damage to isolation valves
through heat transfer.
4.12.1

Heating flow and return connection

Note
Before connecting the heating circuit to the
boiler, all pipework and radiators must be thor-
oughly flushed to remove any installation debris.
ecoTEC plus combination boiler
13
Fig. 4.9 Installing the heating flow and return connection for
ecoTEC plus combination boiler
• Insert the seal (1) and fit the service valve (2) to the
return connection of the appliance.
• Insert the seal (10) and fit the service valve (9) to the
flow connection of the appliance.
• Install the O-ring seal (12) on the return valve (11).
Note
Lay the filling loop hose (13) above the pipe-
work elbows.
• Fit the union nuts (4) and (7) as well as the compres-
sion olives (3) and (8) to the pre-bended 22 mm cop-
per tails (5) and (6).
• Fully insert pipes (5) and (6) into the service valves.
Tighten the union nuts in this position.
• Fit the handle for the filling loop with a countersunk
screw to the service valve (9).
ecoTEC pro combination boiler
• Insert a seal (1) and fit the service valves (2) to the
flow and return connection of the appliance.
• Fit a union nut (4) and a compression olive (3) to the
22 mm pre-bended copper tail (5) .
• Fully insert pipe (5) into the service valve. Tighten the
union nuts in this position.
Instructions for installation and servicing ecoTEC / 839592_09
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