Connection The Power Supply - Vaillant ecoTEC plus 937 Instructions And Maintenance Instructions

4 Sequence of operations during installation
• Pull the electronics box forward and lower.
• Unclip the back cover of the electronics box and lift
the cover upwards to reveal the connections.
1
2
3
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.
a Caution!
Danger of cable damage!
Observe the routing of the cable!
The cables must not touch hot unit compo-
nents!
2
1
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.
26
3
- + 7 8 9 L N 3 4 5
• 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.

4.19.3 Connection the power supply

Fig. 4.18 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)
4
Blue wire (neutral)
Brown wire (live)
5
h Note
Do not connect power to the terminals 7-8-9 or
eBUS (+, -).
Note
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.
Installation and maintenance instructions ecoTEC plus 0020031552_03
- + 7 8 9 L N 3 4 5
- + 7 8 9 L N 3 4 5
Boiler connection
earth symbol
Boiler connection N
Boiler connection L