6
• Installation
3110086 EHC20 UK 110515
B.2
Electrical connection
Disconnect the power supply before working on the device and make sure that it cannot be
reconnected!
Check that the power is off!
The electrical connection must only be carried out by qualified personnel in compliance with
the applicable laws. The automatic controller must not be put into operation if any damage is
visible on the housing, such as cracks.
Low-voltage cables such as temperature sensor cables must be routed separately from mains
voltage cables.
Only put temperature sensor cables into the left side, and the mains voltage
cable into the right side of the device.
Safe isolation of the voltage supply to the automatic controller has been provided, such as
provision for an overheating emergency stop switch.
The cables to be connected to the device may be stripped up to maximum of 55 mm and the
sheath should reach into the housing to exactly behind the strain relief.
The automatic controller and VFS sensor must have the same earthing potential. The VFS
sensor has a functional earthing (PELV). The peripheral unit terminal of the automatic
controller must be connected to the the piping system near the sensor.
Terminal instructions
1. Insert a suitable screwdriver into the upper opening and press the lock handle down.
Leave the screwdriver in the opening.
2. Insert the cable into the lower opening.
3. Remove the screwdriver.
B.3
Temperature sensor installation
The automatic controller works with Pt1000 temperature sensors to ensure that the temperature is precisely recorded
so that the unit functions under technically optimal conditions.
The temperature sensor cables must be placed separately from the mains cables and must not,
for example, be placed in the same cables duct!
Place the sensors precisely in the area to be measured! Only use the feeder, tube or flush
sensor for the applicable area of use with the allowed temperature range that corresponds to
each. The thermal conductor must be used during assembly!
