Air Supply; Electrical Connection; System Requirements; Water Circulation System - Vaillant ecoTEC plus 937 Instructions And Maintenance Instructions

b) so that products of combustion are not directed to
discharge across a boundary.
1) Dimensions B, C and D:
These dimensions can be reduced to 25 mm without
having a negative effect on the performance of the
boiler. In order to ensure that condensate plume does
not affect adjacent surfaces the terminal should be
extended as shown in Fig. 3.7.
2) Dimension F:
These dimensions can be reduced to 25 mm without
having a negative effect on the output of the combi
boiler. However in order to ensure that the conden-
sate plume doe not affect adjacent surfaces a clear-
ance of 300mm is preferred. For IE, recommenda-
tions are given in the current edition of IS813.
Fig. 3.7 Flue termination under balcony/eaves
3.8

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.
Ventilating a cabinet or enclosure
This appliance is highly efficient. As a consequence the
heat loss from the casing is very small. For cupboard or
compartment installations it is not necessary to provide
any high or low permanent air vents for cooling or ven-
tilation purposes.
3.9

Electrical connection

In accordance with BS 7671 (IEE Wiring Regulations) and
any other local regulations which may apply, a 3 A
fused single phase AC supply (230 V, 50 Hz) must be
provided. In IE the current issue of the ETCI regulations
must be observed. The method of connection to the
mains electricity supply must provide a means of
completely isolating the boiler and ancillary controls.
Isolation is preferably by the use of a fused three pin
plug and unswitched shuttered socket outlet, both com-
plying with the requirements of BS 1363. Alternatively,
a 3 A fused double pole switch with 3 mm contact sepa-
ration on both poles may be used.
Installation and maintenance instructions ecoTEC plus 0020031552_03
General requirements 3
Danger!
e
Danger of death by electric shock!
The unit must be earthed.
3.10

System requirements

3.10.1 Water circulation system

Detailed recommendations concerning the water circu-
lation system can be taken from BS 6798 and BS 5449,
Part 1 (for "Small Bore" and "Micro Bore" central heat-
ing systems). Pipework which does not form part of the
usable heating surface should be insulated to prevent
heat losses and possible freezing up, especially where
the pipes run through roof spaces and ventilated under-
floor spaces. The drain connections must be located in
easily-accessible locations, so that draining the entire
system including the combi boiler and the hot water
system is possible. The drain connections should be at
least 1/2 " (BSP nominal size) and must be in accord-
ance with BS 2879.
The combi boiler is suitable for Minibore and Microbore
Systems. Copper tubing in accordance with BS 2871
should be used for all water carrying pipework. All capil-
lary joints in all Domestic Hot Water (DHW) pipework
must be made with lead free solder. When a new boiler
is to be fitted to an existing system, it is good practise
that the system is thoroughly flushed before the boiler
if installed in the system. See BS 7593 for full details.
Caution!
a
To prevent the formation of deposits and
prevent serious damage to the appliance and
system, cleansers must be used carefully
following the cleanser manufacturers instruc-
tions and must be removed by thoroughly
flushing the system. Cleansers should only
be left in systems for a maximum of 24 hours.
Failure to thoroughly remove cleanser from a
system could result in damage to the appliance.
The cleaning must take place before fitting a new boiler
and in accordance with BS 7593. Recommendations for
use of system cleaning agents can be obtained from
Sentinel, Betz Dearborn Ltd. Widnes, Cheshire, WA8
8UD, Tel. 0151 420 9595, or Fernox, Alpha Fry Technolo-
gies, Tandem House, Marlow Way, Croydon, CR0 4XS,
Tel. 0870 8700362.

3.11.2 Filling and preparation of the heating system

The system can be filled using the incorporated filling
device. This connection must be removed again after
the filling process is complete. If the local Water Author-
ity regulations do 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 systems are given in BS 5449)
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