Installing The System Control In The Electronics Box; Requirements For The Ebus Line; Opening The Control Pcb's Electronics Box; Routing The Cables In The Electronics Box - Vaillant uniTOWER plus Operating Instructions Manual

6.9 Installing the system control in the
electronics box
Condition: Installing a multiMATIC VRC 700
1
A
3
4
C
▶
Remove the cover (1) on the electronics box.
▶
Connect the DIF cable (2), which is laid out ready, either
to the system control or to the mobile base station.
▶
If you are using a radio receiver, use the mobile base
station (3).
▶
Consult the instructions for the system control for inform-
ation on coupling the mobile base station and the system
control.
▶
If you are using the wired system control, use the system
control (4), → Instructions for the system control and sys-
tem instructions.
▶
Consult the wiring diagram in the appendix for informa-
tion on the integration into the eBUS network.
6.10

Requirements for the eBUS line

Observe the following rules when routing the eBUS lines:
▶
Use twin-core cables.
▶
Never use shielded or twisted cables.
▶
Use only appropriate cables, e.g. NYM or H05VV (-F/-U).
▶
Observe the permissible total length of 125 m. In this
case, a conductor cross-section of ≥ 0.75 mm² up to
50 m total length and a conductor cross-section of
1.5 mm² from 50 m.
In order to prevent faults in the eBUS signals (e.g. due to
interferences):
▶
Maintain a minimum clearance of 120 mm to power sup-
ply cables or other electromagnetic sources of interfer-
ence.
0020291525_04 Installation and maintenance instructions
▶
▶
6.11
2
B
1.
2.
6.12
1.
2.
3.
4.
For parallel routing to mains connection lines, guide the
cables in accordance with the applicable regulations, e.g.
on cable trays.
Exceptions: For wall breaks and in the electronics box, it
is acceptable to not reach the minimum clearance.

Opening the control PCB's electronics box

C
B
Hinge the electronics box forwards.
Detach the four clips, on the left and the right and at
the top, from the brackets.

Routing the cables in the electronics box

At lengths of over 10 m, route connection cables with
mains voltage separately from sensor lines. Minimum
clearance for the extra low-voltage wire and power
supply cable at a line length of > 10 m: 25 cm.
Observe the requirements for eBUS lines.
(→ Section 6.10)
24V / eBUS
Route 24 V cables and eBUS cables through the left-
hand strain reliefs on the electronics box.
Route 230 V cables through the right-hand strain reliefs
on the electronics box.
A
24V= 24V= - +
S20 S21 BUS
230V
35