Domestic Hot Water Cylinder; Condensate Drain; Heating System Controls; Draining Tap - Vaillant ecoTEC plus Instructions For Installation And Servicing

3.8

Domestic hot water cylinder

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 regulations and water regulations at the time
of installation.
For building regulations refer to G3 and for water
regulations 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 authority
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
thermostat control the boiler. Vaillant have a range of
optional easy fit controls available.
Thermostatic radiator valves must be installed,
however they must not be fitted in a room where the
room thermostat is located.
Note!
All systems must have at least one radiator
not fitted with a thermostatic valve.
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)
and
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.
Installation and Servicing ecoTEC plus
General requirements 3
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.
A variable duty pump should be set to give a
temperature difference of no greater than 20°C
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 thoroughly 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.
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 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
Tel: 0870 601 5000
Fernox technical help line
01799 550811
or:
Sentinel, GE Betz
Widnes
Cheshire, WA8 8UD
Tel: 0151 420 9595.
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