HB Products HBDF-MK2 User manual

HB Products A/S –Boegekildevej 21 -8361 Hasselager –tel.: [phone] –Email: inf[email protected]
Quick Guide
HBDF-MK2 Defrost Sensor
Defrost on demand
For installation on air-coolers/evaporators:
Green LED
Flash with
power ON

HB Products A/S –Boegekildevej 21 -8361 Hasselager –tel.: [phone] –Email: inf[email protected]
Simple calibration,
only use these 2
parameters.
Simple set-up, only two parameters and execution of a zero/start point with
frozen/dry evaporator surface (surface with thin layer of frozen ice as after
defrost is the optimal start point). The length of the wire entered is only the
wire between the fins, and not the free wire in the bending.
Type in sensor length in mm.
Type in fins distance in mm.
Perform a zero calibration with dry/frozen evaporator surface.
Advanced Calibration:
The calibration should be carried out before ice begins to build up. When
the evaporator is free of ice, the sensor emits 4mA. Depending on the ice
build-up, the sensor emits up to 18 mA. A visual inspection must be carried
out to determine when defrost should be performed, and the system’s
defrost control (PLC) should be set to perform defrost at that given signal
level (for example 12 mA). Defrost must be stopped when outside coil
temperature is above 5 to 10°C. After fan delay where remaining water
droplets from the melted frost is frozen to the surface of the evaporator,
here the signal is 4 to 5mA indicating clean evaporator without ice.
The built-in relays can be used to activate simple defrost control or digital
input to an external defrost controller (Replace a timer)
Note! Connect ONLY the USB together with 24VDC at the same time.
If using 24VAC, don’t connect the USB cable at the same time!!