22 Installation and maintenance instructions Ultimate 3 0020239568_03
4. Strip the flexible line as shown in the figure. In doing so,
ensure that the insulation on the individual conductors
is not damaged.
5. Only strip inner conductors just enough to establish
good, sound connections.
6. To avoid short circuits resulting from loose individual
wires, fit conductor end sleeves on the stripped ends of
the conductors.
7. Screw the respective plug to the connection cable.
8. Check whether all conductors are inserted mechanic-
ally securely in the plug terminals. Remedy this if ne-
cessary.
9. Plug the plug into the associated PCB slot; see the wir-
ing diagram in the appendix.
7.10.5 Establishing the power supply
1. Observe all valid regulations.
2. Make sure that the rated voltage of the mains is 230 V.
3. 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
4. Do not interrupt the mains supply with a time switch or
programmer.
5. Connect the product using a fixed connection and an
electrical partition with a contact gap of at least 3 mm
(e.g. fuses or power switches).
6. Isolation should preferably be by a double pole
switched fused spur box having a minimum contact
separation of 3 mm 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.
7. Carry out the wiring. (→ Page 21)
8. Screw the supplied plug (2) to a three-core power sup-
ply cable that complies with the relevant standards.
9. Observe the routing of the power supply cable (1) in the
electronics box in order to guarantee that there is no
strain.
10. Insert the plug into the bush in the electronics box.
11. Make sure that access to the power supply is always
available and is not covered or blocked.
7.10.6 Connecting the heating pump
▶ Connect the heating pump to the boiler; see the wiring
diagram in the appendix.
7.10.7 Connecting controls to the electronics
–
+
24V=
RT BUS
Burner
off
X106
BUS24 V
BUSRTB.off
B
ur
ner
off
R
T
24V
=
-
+
B
U
S
1
4
32
1 Limit thermostat for
underfloor heating
2 24 V control
3 eBUS control or radio
receiver unit
4 Outdoor temperature
sensor, wired
1. Open the electronics box. (→ Page 21)
2. Carry out the wiring. (→ Page 21)
3. Connect the individual components depending on the
installation type.
Condition: If installing a multi-circuit control.
▶ Change the pump's operating mode d.18 from Eco (in-
termittent pump operation) to Comfort (continuous pump
operation).
Condition: When connecting a control (230 V).
▶ Connect the control to the main plug.
▶ Remove the bridge from the 24V=RT plug.
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