Internal Flue Installation; Air Supply; Cupboard Or Compartment Ventilation; Domestic Hot Water Cylinder - Vaillant ecoTEC plus Instructions For Installation And Servicing

Fig. 3.7 Flue termination under balcony/eves

3.5.2 Internal flue installation

The flue can be installed from inside the building when
access to the outside wall face is not practicable.
3.6

Air supply

Detailed recommendations for air supply are given in
BS 5440: Part 2. It is not necessary to have an air vent in
the room or internal space in which the boiler is installed.
3.7

Cupboard or compartment ventilation

The boilers are very high efficiency appliances.
As a consequence the heat loss from the appliance
casing during operation is very low. For cupboard or
compartment installations it is therefore not necessary
to provide any high or low level permanent air vents
for cooling purposes.
3.8

Domestic hot water cylinder

a Caution!
Single feed indirect cylinders are not suitable.
The domestic hot water cylinder must be of the
double feed fully indirect coil type. It must be
suitable for working at a gauge pressure of
0.35 bar above the safety valve setting.
3.8.1

Unvented hot water cylinder

The ecoTEC plus can be connected to an unvented hot
water cylinder. Vaillant offer a range of cylinders called
uniSTOR with capacities from 125 litres to 310 litres. All
unvented domestic hot water cylinders must be installed
by a competent person approved at the time by the
Health and Safety Executive to the current building reg-
ulations and water regulations at the time of installa-
tion.
For building regulations refer to G3 and for water regu-
lations guidance G17 to G24 and recommendation R17
to R24. For Ireland: The current issue of BS5546 and
BS6700. If fitting to an existing system the local author-
ity should be informed.
Instructions for installation and servicing ecoTEC plus 0020020828_07
General requirements 3
3.9

Condensate drain

A plastic drain pipe must be fitted to allow discharge of
condensate to a drain.
Condensate should, if possible, be discharged into the
internal household draining system. If this is not
practical, discharge can be made externally into the
household drainage system or a purpose designed soak
away, see Section 4.3.5 for more details.
3.10

Heating system controls

It is recommended that a programmer and room ther-
mostat control the boiler. Vaillant have a range of op-
tional easy fit controls available.
Thermostatic radiator valves must be installed, however
they must not be fitted in a room where the room ther-
mostat is located.
h Note!
All systems must have at least one radiator
not fitted with a thermostatic valve.
Note!
h
For further information, see the current issue
of the Building Regulations, approved document
L1, and the following current issues of:
1. Central heating system specification (CheSS)
2. Controls for domestic central heating system
and hot water (BRECSU).
3.11

Draining tap

A draining tap must be provided at all the lowest points
of the system, which will allow the entire system and
hot water system to be drained. Draining taps shall be
to the current issue of BS 2879.
3.12

Safety valve

A safety valve need not be fitted to an open-vented system.
3.13

Bypass

A system bypass will be required fitted at least 1.5 metres
away from the boiler, refer to the current issue of central
heating system specifications (CHeSS).
3.14

Pump specification

The pump should be fitted on the flow pipe from the
boiler and have isolating valves each side.
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