Instructions for installation and servicing ecoTEC plus / 0020020828_05
12
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 to the current building regula-
tions and water regulations at the time of installation.
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.
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.
h
Note!
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.
3.15 Cleanser
and
inhibitor
In the case of an existing installation, it is essential that
prior to installing the new boiler the system is thorough-
ly flushed. For optimum performance after installation
of a new system, the boiler and its associated central
heating system should also be flushed. Flushing should
be carried out in accordance with BS7593: 1992 using
a cleanser such as Sentinel X300 or X400, or Fernox
Superfloc. For long-term corrosion protection, after
flushing, an inhibitor suitable for stainless steel heat
exchangers should be used, refer to the current issue of
BS 5449 and BS 7593 on the use of inhibitors in central
heating systems. Examples are Sentinel X100 and Fernox.
a
Caution!
It is essential that the cleanser is fully
removed from the system after flushing and
before adding inhibitor. Take care to ensure
that all low points in the system are fully drained.
For all systems follow the manufacture’s instructions,
but where new radiators are fitted do not leave the
cleanser in the system for longer than 24 hours.
For optimum performance the boiler and its associated
central heating system should be flushed in accordance
with BS7593: 1992 using a cleanser.
For advice on the application of system cleansers and
inhibitors contact either;
Fernox, Alpha-Fry Technologies
Tandem House
Marlow Way, Beddington Farm Road
Croydon CR0 4XS
Telephone: 0870 601 5000
Fernox technical help line: 01799 550811 or:
Sentinel, GE Betz
Widnes, Cheshire, WA8 8UD
Telephone: 0151 420 9595.
3 General requirements
