Danfoss EFIT 850, Installation And User Manual, Page: 11 / 36

User Manual
11
Placement
The EFIT™ 850 and power supply are designed for DIN rail mounting . When mounting
please be aware of the following conditions:
The EFIT™ 850 is designed and approved to operate in the temperature
range -10°C to 40°C.
The EFIT™ 850 is only IP20 protected, thus not water resistant.
The installer must ensure proper enclosure of the EFIT™ 850 according to
national standards (electrical safety).
Connection steps for system
Only authorized personnel is allowed to install the EFIT™ 850.
When wiring up the EFIT™ 850 and sensors, please be aware of the following
conditions:
When the EFIT™ 850 is used in a dual system configuration, it is preferable
that each sensor bus (devibus™) can be connected and disconnected via
switches. During the installation of a dual system, each system must be con-
nected one at a time.
Be aware of maximum allowable power drain from power supply to sensors.
Below is shown the recommended order of the installation . Please refer to figure A for
connection of EFIT™ 850 and refer to figure B-G for a guideline to connect the heating
elements to EFIT™ 850 .
1 . Connect heating cables to the EFIT™ 850
• Please notice that a single system ALWAYS uses the System A output relay
• When using external power relay, please refer to the connection diagrams.
2 . Connect the power supply to the EFIT™ 850
• Do not connect the power supply to mains yet
3 . Connect sensors to the Devibus™
• When used as a dual system, only the sensors for System A can be connected . For
connection of System B please refer to chapter: “Installation of dual system” .
4 . Connect the power supply to mains .
Installer Manual