Electrical Supply; Guide To System Requirements; Water Circulation System; Filling And Preparing Heating System - Vaillant ecoTEC plus 612 Instructions For Installation And Servicing

3.9

Electrical supply

A 230 V, ~ 50 Hz single phase electricity supply fused to
3 Amp. must be provided in accordance with the latest
edition of BS 7671 (IEE Wiring Regulations) and any
other local regulations that may apply. In IE reference
should be made to the current edition of the ETCI rules.
The method of connection to the mains electricity sup-
ply must provide a means of completely isolating the
boiler and its ancillary controls. Isolation is preferably by
the use of a fused three pin plug and unswitched shut-
tered socket outlet, both complying with the require-
ments of BS 1363. Alternatively, a 3 Amp. fused double
pole switch with a 3 mm contact separation on both
poles may be used.
Danger!
This appliance must be earthed.
3.10

Guide to system requirements

3.10.1 Water circulation system

Detailed recommendations for the water circulation sys-
tem are given in BS 6798 and BS 5449: Part 1 (for small
bore and micro bore central heating systems). Pipework
not forming part of the useful heating surface should be
insulated to help prevent heat loss and possible freezing,
particularly where pipes are run through roof spaces
and ventilated underfloor spaces. Draining taps must be
located in accessible positions which permit the draining
of the whole system including the boiler and the hot
water system. Draining taps should be at least 1/2 in.
BSP nominal size and be in accordance with BS 2879.
The boiler is suitable for use with minibore or microbore
systems. Copper tubing to BS 2871: Part 1 should be used
for water carrying pipework. All capillary joints in all
DHW pipework must be made with lead free solder.
Particularly where a new boiler is to be fitted to an exist-
ing system, it is good practice that the system is thor-
oughly cleansed. This cleansing should take place prior
to the fitting of the new boiler and be in accordance with
BS 7593. For advice on the application of system cleans-
ers contact Sentinel, Betz Dearborn Ltd. Widnes,
Cheshire, WA8 8UD. Tel: 0151 420 9595, or Fernox, Alpha
Fry Technologies, Tandem House, Marlow Way, Croydon,
CR0 4XS. Tel 0870 8700362.

3.10.2 Filling and preparing heating system

The system can be filled using the built in filling loop
(ecoTEC plus 800 series only) or via a separate filling
point fitted at a convenient position on the heating cir-
cuit. The connection must be removed when filling is
completed. Where local Water Authority regulation does
not allow temporary connection, a sealed system filler
pump with break tank must be used. The heating system
will not be filled automatically from the domestic hot
water side. (Alternative methods of filling sealed sys-
tems are given in BS 5449).
Instructions for installation and servicing ecoTEC
General requirements 3

3.10.3 Pressure relief valve

A pressure relief valve is provided with the boiler. This
safety device is required on all sealed C.H. systems and
is preset at 3 bar and provided with a 15 mm compres-
sion connection for a discharge pipe, which must be of
no less than 15 mm in diameter. The pressure relief valve
must not be used for draining purposes.

3.10.4 Pressure gauge

This is factory fitted to the boiler and indicates the pri-
mary circuit pressure to facilitate filling and testing.

3.10.5 Expansion vessel

ecoTEC boilers incorporate a 10 litre expansion vessel
which is suitable for a sealed heating system with a max-
imum water content of 100 litres.
If the nominal capacity of the built in expansion vessel is
not sufficient for the heating system (for instance in
case of modernisation of old open systems) an addition-
al expansion vessel can be installed external to the boil-
er. It should be fitted in the return pipe as close as possi-
ble to the boiler in accordance with BS 5449: Part 1.
Guidance on the sizing of an additional expansion vessel
is given in Table 3.5.
Initial system pressure (bar)
Pressure relief valve setting (bar)
Total water content of system litres
25
50
100
125
150
175
200
225
250
275
300
325
350
375
400
425
450
475
500
For system volumes other than those given
above, multiply the system volume by the
factor across
Table 3.5 Sizing of additional expansion vessel
Vessel Volume [L]
1.0 1.5
3.0
2.7 3.9
5.4 7.8
10.9 15.6
13.6 19.5
16.3 23.4
19.1 27.3
21.8 31.2
24.5 35.1
27.2 39.0
30.0 42.9
32.7 46.8
35.7 50.7
38.1 54.6
40.9 58.5
43.6 62.4
46.3 66.3
49.0 70.2
51.8 74.1
54.5 78.0
0.109 0.156
15