Expansion Relief Valve (Safety Group), Heating Installation; Condensate Drain Pipework; H Danger; A Caution - Vaillant ecoTEC VU 656/4 Installation And Maintenance Instructions Manual

5.6 Expansion relief valve (safety group), heating
installation
4
Fig. 5.11 Fitting the safety valve
The ecoTEC is equipped ex factory with connections for
a safety group:
• Pressure gauge (1)
• Filling device (combined filling and emptying valve)
(2)
• Connection for expansion vessel (3)
• Expansion relief valve (4)
As an accessory the expansion relief valve for the
heating installation is delivered with the boiler.
• Install the expansion relief valve (4).
• Fit a sufficiently sized expansion vessel (to be
provided on site) at the designated connection (3).
H Danger!
Danger of burning and scalding!
The expansion relief valve (4) must be
noticeable! Terminate the line in such a way
that escaping water or steam cannot cause
injury to persons.
Please note that the end of the line must be
visible.
a Caution!
Risk of damage!
The line should be terminated in such a way
that cables or other electrical components
cannot be damaged.
Installation and maintenance instructions ecoTEC 0020029173_01
5.7

Condensate drain pipework

1
1
2
a
2
3
Fig. 5.12 Condensate drain pipework
3
Legend:
a Internal stackpipe
b Internal discharge system
c Gully
d Soakaway
The ecoTEC boilers are equipped with a usual
condensate collector from which the condensate is
continuously removed via the drain pipe.
• Connect the condensate drain of the boiler to a
condensate drain hose (1) which has a minimum
internal diameter of 19 mm (22 mm outside diameter
for all external pipes) and should be made from an
acid-resistant material (e.g. plastic overflow pipe).
h Note!
The drain hose connected to the condensate
drain of the boiler must have a fall throughout
its entire length (45 mm per metre) and should
be installed and connected within the building
to prevent freezing.
The condensate drain hose must terminate in a suitable
location, e.g.:
a) Preferably the drain hose should run and terminate
internally to the house soil and vent stack (at least
450 mm above the invert of the stack). A siphon
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 (2) in the drain hose
upstream of the siphon. 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.
Installation 5
b c
5
3
4 6
d
19