Vaillant ecoFIT sustain Series Installation And Maintenance Instructions Manual page 21

9. Screw the respective plug to the connection cable.
10. Check whether all conductors are inserted mechanic-
ally securely in the terminals of the plug. Remedy this if
necessary.
11. Plug the plug into the associated PCB slot.
–
In doing so, observe the wiring diagram in the ap-
pendix.
7.8.4 Establishing the power supply
1
1. Observe all valid regulations.
2. Ensure that the nominal mains voltage is 230 V.
3. Do not interrupt the mains supply with a time switch or
programmer.
4. Set up a fixed connection and install a partition with
a contact gap of at least 3 mm (e.g. fuses or power
switches).
5. Isolation should preferably be by a double pole
switched fused spur box having a minimum contact
separation of 3mm on each pole. The fused spur box
should be readily accessible and preferably adjacent to
the boiler. It should be identified as to its use.
6. Provide one common power supply for the boiler and
for the corresponding control:
–
Power supply: Single-phase, 230 V, 50 Hz
– Fuse protection: ≤ 3 A
7. Open the electronics box. (→ Page 20)
8. Observe the routing of the power supply cable (1) in the
electronics box in order to guarantee that there is no
strain.
0020230529_06 ecoFIT sustain Installation and maintenance instructions
9. Connect the cables. (→ Page 20)
10. Close the electronics box.
11. Make sure that access to the power supply is always
available and is not covered or blocked.
7.8.5 Connecting controls to the electronics
1 Safety thermostat for
underfloor heating
2 24 V control
1. Ensure that the product is voltage-free.
2. Connect the cables. (→ Page 20)
3. Connect the individual components depending on the
installation type.
Condition: If installing a multi-circuit control.
▶
Change the pump mode d.18 from Eco (intermittent
pump operation) to Comfort (continuous pump opera-
tion).
L
N
R T
1
X1
L N
RT
230V~
24 V BUS
– +
Burner 24V=
off
RT BUS
1 2 3
X2
X41
X22
4
3 eBUS control or radio
receiver unit
4 Outdoor temperature
sensor, wired
21