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Table of contents
MT20 Wired Timer – 6 720 882 947 (2019/07)
2
Table of contents 1 Explanation of symbols and safety
instructions
1.1 Explanation of symbols
Warnings
In warnings, signal words at the beginning of a warning are used
to indicate the type and seriousness of the ensuing risk if
measures for minimising danger are not taken.
The following signal words are defined and can be used in this
document:
DANGER:
DANGER indicates that severe or life-threatening personal
injury will occur.
WARNING:
WARNING indicates that severe to life-threatening personal
injury may occur.
CAUTION:
CAUTION indicates that minor to medium personal injury may
occur.
NOTICE:
NOTICE indicates that material damage may occur.
Important information
The info symbol indicates important information where there is
no risk to people or property.
Additional symbols
Table 1
1 Explanation of symbols and safety instructions . . . . . 2
1.1 Explanation of symbols . . . . . . . . . . . . . . . . . . . . . . 2
1.2 General safety instructions . . . . . . . . . . . . . . . . . . . 3
2 Product Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Declaration of conformity . . . . . . . . . . . . . . . . . . . . 4
2.3 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1 Prerequisites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1.1 Installation location. . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1.2 Prepare the MT20 unit for mounting . . . . . . . . . . . 5
3.2 Installing the device . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2.1 Mounting the wall plate . . . . . . . . . . . . . . . . . . . . . . 6
3.2.2 Fitting the MT20 onto the wall plate. . . . . . . . . . . . 6
4 Electrical connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5 Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.1 Function check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6 Environmental protection/disposal . . . . . . . . . . . . . . . 8
7 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7.1 MT20 overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7.2 Setting the time . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7.3 Setting the heating times. . . . . . . . . . . . . . . . . . . . . 9
7.4 Operating mode selection . . . . . . . . . . . . . . . . . . . . 9
8 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
8.1 General maintenance. . . . . . . . . . . . . . . . . . . . . . . 10
9 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
9.1 General troubleshooting . . . . . . . . . . . . . . . . . . . . 10
10 Short operating instructions . . . . . . . . . . . . . . . . . . . . 11 Symbol Meaning
a step in an action sequence
a reference to a related part in the document
a list entry
a list entry (second level)
2


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