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Operating instructions
Room temperature controller "MH-555C"
Item no. 1407844
Intended use
The product is used to automatically turn on/off an electric load (e.g. heater or air conditioner)
when the temperature is below/above a certain level.
See chapter "Technical data" for information on connection and the maximum permissible
power consumption of the connected electrical loads.
This product is only to be installed and used indoors in dry conditions.
Always observe the safety instructions and all other information included in these operating
instructions. Read the operating manual carefully; keep it in a safe place or pass it on to others
using the product.
Any use other than that described above could lead to damage to this product and involves
the risk of short circuits, fire, electric shock, etc. No part of the product may be modified or
converted!
This product complies with the applicable national and European requirements. All names
of companies and products are the trademarks of the respective owners. All rights reserved.
Package contents
• Room temperature controller
• Operating instructions
Up-to-date operating instructions:
1. Open www.conrad.com/downloads in a browser or scan the dis-
played QR code.
2. Select document type and language and enter the item number
into the search field. After submitting the query you can download
displayed records.
Explanation of symbols
The lightning symbol indicates a health hazard, e.g., electric shock.
This symbol indicates specific risks associated with handling, operation or use.
The arrow symbol indicates special tips and operating information.
The product may be used only in dry, indoor rooms; it must not get damp or wet.
Observe the operating instructions!
Safety instructions
Read the complete operating manual carefully before using the product, as it
contains important information about the correct installation and operation.
Damages due to failure to follow these operating instructions will void the
warranty! We do not assume any liability for any resulting damage!
Attention, important note!
This device should be installed only by people with relevant electro-technical
knowledge and experience! *)
If it is not installed properly, you risk:
• your own life
• the life of the user of the electrical system.
If it is installed improperly, you risk severe damage to property, e.g., by fire.
You face the risk of personal liability for personal injury and material damage.
Contact an electrician!
*) Specialist knowledge required for the installation:
For the installation, in particular, the following specialist knowledge is required:
• the "5 safety rules" to be followed: Switch off power; secure against switching back
on; determine voltage-free status; earthing and short-circuiting; cover or fence off
nearby live parts
Version 06/17
°
°
• Choose appropriate tools, meters and, if necessary, personal protective equip-
ment
• Evaluation of the measurement results
• Choose the electrical installation material to ensure the disconnect conditions
• IP protection types
• Installation of the electrical installation material
• Type of mains supply network (TN system, IT system, TT system) and the con-
nection conditions that follow from them (classical earthing, protective earthing,
required additional measures, etc.)
If you do not have the expertise required for the installation, do not connect
and install it yourself, rather ask a qualified technician.
a) General
• The unauthorised conversion and/or modification of the product is not permitted for
safety and approval reasons (CE). Never open/dismantle it (apart from the works
for installation and connection described in the manual)!
Maintenance, adjustment or repair work may only be carried out by an expert/
authorised service centre, which is familiar with the hazards involved and the
relevant regulations.
• The product is not a toy and does not belong in the hands of children. There is a
risk of a life-threatening electric shock!
• The accident prevention regulations of the association of compensation insurers
must be followed when using all electrical facilities and equipment in commercial
locations!
• Do not leave the packaging material unattended since this may become a danger-
ous plaything for children.
• Handle the product with care; it can be damaged by impacts, blows, or accidental
falls, even from a low height.
• If you have any questions that are not answered in these operating instructions,
please contact our technical department or another specialist.
b) Operating location
• The product may be installed and used only in dry indoor spaces; it must not get
damp or wet!
• Use the product only when it is securely installed and steady. Never install and use
the product in a vehicle.
• Be especially careful if children are around. Children cannot recognise the danger
arising from the incorrect use of electrical devices. There is a risk of a life-threat-
ening electric shock!
• The product must not be exposed to extreme temperatures, direct sunlight, strong
vibrations, dust, dirt or heavy mechanical stress. Keep the product away from
strong magnetic fields generated by machines, electric motors or loudspeakers.
• Do not operate the device in environments where there are high levels of dust,
flammable gases, vapours or solvents. There is a danger of fire and explosion!
c) Installation, Connection
• During installation, all poles must be disconnected from the mains voltage, e.g., via
RCD. There must be an appropriately dimensioned fuse or circuit breaker between
the RCD and the product.
• Install the product only in an easy-to-reach position.
• Perform installation and connection only when all supply lines are disconnected
from the mains voltage. Otherwise, there is a risk of a life-threatening electric
shock!
• Also observe the safety and operating instructions of any other devices that are
connected to this product.
• Do not connect the product to the power supply immediately after it has been
transferred from a cold room into a warm one (e.g., during transport). The conden-
sation that forms might destroy the device. Moreover, there is danger of electric
shock!
Allow the device to reach room temperature before switching it on. Wait until
the condensation has evaporated. This might take several hours. Only after this
should it be installed, connected to the mains supply and put into use.
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