Vaillant ecoTEC plus 937 Service Manual download pdf (Page 33)

Installation and maintenance instructions ecoTEC plus 937 0020031552_06 33

Pull the electronics box forward and lower.

Unclip the back cover of the electronics box and lift

the cover upwards to reveal the connections.

Fig. 4.16 Cable run on the underside of the unit

Feed the wiring harness (2) of the shift load storage

tank with the grommets (3) through the cable entries

provided on the shift load storage tank and on the

combi boiler.

On the combi boiler use the cable entry at the very

front (1).

Fix the grommets to the cable entries using the

spring clamps provided.

-+789 LN 345

X31

X12

Fig. 4.17 Cable routing in the electronics box

Run the pump cable X12 (3) outside the electronics

box.

Push the plug X12 of the pump cable onto the plug

socket X12 (5) on the printed circuit board.

Run the sensor cable (1) with plug X31 to the printed

circuit board.

Push the flat connector X31 onto the plug socket X31

(2) (left-hand side of the printed circuit board).

Fix the cable (4) in the electronics box via the cable

clamps.

5.19.3 Establishing the power supply

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.

-+789 LN 345

Fig. 5.18 Connecting the power supply

Run the flex through the cable entries provided in the

combi boiler and in the electronics box and tighten

the cable clamps.

Connect the flex to terminals L and N and the earth

connection of the terminal block.

Green-yellow wire

(earth)

Boiler connection

earth symbol

Blue wire

(neutral)

Boiler connection N

Brown wire

(live)

Boiler connection L

Make sure that the cables are securely fixed

in the terminal blocks.

Refit the electronics box cover by pushing into place

until it clips back into position ensuring all wires are

not trapped or pinched.

Lift the electronics box up and secure.

Sequence of operations during installation 5

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 79 80

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Vaillant ecoTEC plus 937 Service Manual Page 33

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