Installation; Wall Mounting; Mounting On The Mounting Rail; Removal From The Mounting Rail - Bosch ISM 1 Installation Instructions Manual

102 | Installation

3 Installation
3.1 Installation
DANGER: Risk of electric shock!
Prior to connecting the power
B
supply, isolate the boiler and all
other BUS subscribers from the
power supply.

3.1.1 Wall mounting

ISM 1 Fig. 2 to 5 from page 114
ISM 2 Fig. 10 to 13 from page 116

3.1.2 Mounting on the mounting rail

ISM 1 Fig. 6 on page 115
ISM 2 Fig. 14 on page 117

3.1.3 Removal from the mounting rail

NOTE: Breaking open the back
panel to remove the device from
the mounting rail reduces the
protection level to IP20.
ISM 1 Fig. 7 on page 115
ISM 2 Fig. 15 on page 117
3.2

Electrical connections

Use cables that comply with local regulations
B
and guidelines.
Always route cables/leads through the fitted
B
grommets and apply the strain relief supplied
to protect the system against the ingress of
dripping water.
6 720 645 355 (2010/09)
3.2.1 Connection - low voltage section with
BUS connection
Permissible cable length between the Heatronic
3 with BUS capability and the ISM...:
Cable length
≤ 80 m
≤ 100 m
≤ 150 m
≤ 200 m
≤ 300 m
Table 5
Route all LV cables/leads separately from
B
cables carrying 220 to 240 V or 380 to 415 V
to avoid inductive interference (minimum
separation 100 mm).
In case of external inductive interference,
B
shield the cables.
This ensures that the cables are shielded from
external interference (e.g. heavy current
cables, overhead wires, transformer stations,
radio and television set, amateur radio
stations, microwave ovens etc).
When sensor leads are extended, apply the
B
following lead cross-sections:
Cable length
≤ 20 m
≤ 30 m
≥ 30 m
Table 6
For splash protection (IP): Route
leads/cables so that the cable
sheath protrudes at least 20 mm
into the cable grommet (
on page 115 and Fig. 16 on
page 117).
Cross-section
2
0.40 mm
2
0.50 mm
2
0.75 mm
2
1.00 mm
2
1.50 mm
Cross-section
2
0.75 mm ... 1.50 mm
2
1.00 mm ... 1.50 mm
2
1.50 mm
Fig. 8
en
2
2