29
ecoTEC plus 937 installation and maintenance manual
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
components!
- + 7 8 9
L N
3 4 5
X3
1
X12
1
2
3
5
4
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.
4.19.3 Connection to the power supply
- + 7 8 9
L N
3 4 5
- + 7 8 9
L N
3 4 5
Fig. 4.18 Connecting the mains 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
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.
Sequence of operations during installation 4
