Instruction manual switches with large electronic unit 05 March 2021
Safety Instructions
CAUTION! Read the instruction manual before commencing work! Heed all warnings. Installation of HBSR requires technical
knowledge of both refrigeration and electronics. Only qualified personnel should work with the product. The technician must be
aware of the consequences of an improperly installed sensor and must be committed to adhering to the applicable local
legislation.
If changes are made to type-approved products, this type approval becomes void. The product's input and output as well as its
accessories may only be connected as shown in this guide. HB Products assumes no responsibility for damages resulting from
not adhering to the above.
Intended use, conditions of use. The switch is manufactured to detect liquid. If the switch is to be used in a different way or for
another purpose, and if the operation of the product in this function is determined to be problematic, prior approval must be
obtained from HB Products.
Prevention of collateral damage. Make sure that qualified personnel assess any faults and take necessary precautions before
attempting to make replacements or reparations, to avoid collateral damage.
Disposal instructions: The switch is built so the modules can easily be removed and sorted for disposal.
Electrical connection
The switch exists in two versions one supplied with 24V AC/DC and one with 90-240V AC. The switch is delivered as NO
(normally open) or NC (normally closed) and this refers to the contact in the switch in dry conditions. The 24 V version switch
can be changed between NO and NC –this is described in a later section. The switch is connected to the power source on pin1
and pin 2. The contact is potential free relay and it is connected to pin 3 and pin 4
24 V
90-240 V
LED indication
1 Brown +24 VDC or 24 V AC
2 White - common or 24 V AC
3 Blue Output potential free
4 Black Output potential free
5 Grey Communication
3x green LED´s indicate liquid detection
Yellow LED “RELAY” or “ON” indicates closed contact between pin 3 and pin4
Green LED “POWER” indicate power is connected and switch is active when
flashing
Irrespective of the output function NO/NC, the three LEDs are activated
when liquid is detected.
Some switches have a LED labeled “ALARM” which is not in use.
