VRT 50 Room Thermostat Operating and Installation Manual
4
VRT 50
-
+
7
8
9
- BUS +
7
8
9
Boiler
L
N
3
4
5
L
N
3
4
5
Fig. 9.1 Electrical connection
10 Start-up
No additional settings are required for the start-up.
The heating engineer can additionally adapt the (pro-
grammable) room thermostat to the environment or the
preferences of the user.
10.1 Installer
level
You can go to the installer level by pressing the dial for
about 10 seconds.
The spanner symbol appears on the display.
• You can switch to the next parameter by pressing the
dial.
The following parameters can be set:
Parameter 1:
Setting of a minimum temperature as a
lower limit for the control range
You can set a minimum temperature by turning the dial.
Setting range 5 … 30° C (default setting: 5° C)
Parameter 2:
Switchover between two-point and contin-
uous control
You can change the parameter by turning the dial.
0 = two-point
control
(default
setting)
1 = continuous
control
You can exit the installer level as follows:
• Press the dial for about 5 seconds
or
• After 5 minutes if you do not operate the dial.
The basic display then reappears.
10.2
Handing over the device to the owner
The owner of the (programmable) room thermostat
must be instructed about its functions and how to oper-
ate it.
• Hand over the manuals intended for the owner as well
as the documents of the device.
• Go through the operating manual with the owner and
answer any questions.
• Draw special attention to the safety instructions,
which the owner must follow.
11 Technical
data
Description
Unit
Value
Operating voltageU
max
V
24
Maximum permissible ambient temperature
°C
50
Current consumption
mA
17
Minimum cross-section of the connection lines
mm
2
0.75
Level of protection
IP 20
Protection class for controller
III
Dimensions
Height
mm
97
Width
mm
97
Depth
mm
27
Table 11.1 Technical data
12 Vaillant
service
To ensure regular servicing, it is strongly recommended
that arrangements are made for a Maintenance Agree-
ment. Please contact Vaillant Service Solutions (0870
6060 777) for further details.
