Safety Instruction; Technical Data; Electrical Connections - Bosch TR 21 Anleitung

Safety Instruction

This appliance may only be installed by a properly
qualified person and as shown in the wiring dia-
grams. The applicable safety regulations must
also be observed.
1 Details of Appliance
Room thermostat for the listed modulating-con-
trol central heating boilers.
This room thermostat is intended exclusively for
temperature control in dry and closed rooms with
normal ambient conditions.
2

Technical Data

Rated voltage
Rated current
Thermostat output,
continuous
Minimum Temperature
change rate
Permissible ambient
temperature
Protection class
Testing class
Table 1
3 Fitting
Fit room thermostat as shown in Figures 1
y
to 4.
6 720 610 267 (00.02)
4
y
Table 2
y
24 V DC
0.01 A
y
2.5 V ...24 V
0.05 K/Min.
y
0 °C...35 °C
III
IP 20

Electrical Connections

Use wires conforming at least to NYM or
H05VV- ... with the following cross-sectional
areas:
Cable length:
£ 20 m
£ 30 m
> 30 m
All 24-V wires (measurement current) should
be routed separately from 230-V or 400-V
wires in order to prevent inductive interfer-
ence (minimum separation 100 mm).
In cases where there is inductive interference
from external sources:
(e.g. power cables, overhead tram cables,
electricity substations, radio and TV equip-
ment, amateur radio equipment, microwave
appliances, etc.), use shielded wires.
Connect up room thermostat as shown in
Figures 5 to 7.
TR 21
Cross section:
2 2
0,75 mm ...1,5 mm
2 2
1,00 mm ...1,5 mm
2
1,5 mm
5