Vaillant ecoTEC plus 937 Service Manual download pdf (Page 32)

32 Installation and maintenance instructions ecoTEC plus 937 0020031552_06

5.19 Electrical connection

5.19.1 General requirements

Danger!

Risk of fatal electric shock from live con-

nections.

Voltage is continuously present in the L and

N terminals of the turquoise coloured plug,

even when the main switch is turned off.

Before working on the switch box, always

switch off the power supply to the appli-

ance by removing the mains plug from the

socket or by disconnecting the optional cir-

cuit breaker.

Danger!

Risk of electrocution as a result of an

improper electrical connection.

An improper electrical connection may nega-

tively affect the operational safety of the

appliance and result in material damage or

personal injury.

The electrical installation must be fitted by

a competent person who is responsible for

complying with the existing standards and

guidelines.

Connect the appliance in accordance with

BS 7671 (IEE Regulations).

For IE: Observe the current ETCI regula-

tions (Electro Technical Council for Ire-

land).

Observe the corresponding installation

instructions for the electrical connection of

ecoTEC combi-heaters.

Earth the appliance.

Caution!

Risk of damage to the appliance.

The electronics may be damaged via a mains

supply at terminals 7, 8, 9 and "BUS".

Only connect the mains supply cable to the

terminals marked for the purpose.

The appliance is designed for connection to 230 V,

~ 50 Hz supply with a 3 A rating. Connection to the

mains supply shall be made via a fused 3 pin plug to an

unswitched shuttered, and should comply with BS 1363.

(Alternatively the connection can also be carried out

with a 3 A fused two-pole isolator, whose contact sepa-

ration at all poles is at least 3 mm and which supplies

only the appliance and controls). The connection must

permit complete isolation of the appliance and its con-

nected controller from the mains supply. It should be

easily accessible and be located in the proximity of the

combi boiler. Use a three core flexible cable in accord-

ance with BS 6500, Tables 6, 8 or 16 (3

x 0.75 to 3 x 1.5

Ensure that all wiring passes through the

cable clamps in the rear of the control box

and are securely fixed.

Check that when connecting the mains wiring that

the current carrying conductors become taut before

the earth conductor should the supply cable slip from

the cable clamp.

5.19.2 Establishing the electrical connection for the

stratified storage tank

Caution!

Risk of cable damage.

Cables may become damaged if they come

into contact with hot parts of the appliance.

Observe the routing of the cable.

X12

X31

Fig. 4.15 Opening the electronics box

5 Sequence of operations during installation

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 79 80

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Vaillant ecoTEC plus 937 Service Manual Page 32

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