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Explanation: cooling operating mode, no operation allowed, no power demand, current temperature of the input
refrigerant piping to the heat exchanger in HVAC -1 °C (blue sensor), on the output +6 °C (red sensor).
Refrigerant temperature display range MIN = -9, MAX= 99.
6.3 INSPECTION OF INPUTS / OUTPUTS – TESTS
WARNING! All the described functionality tests may ONLY be done by an authorized person. Incorrect test
performance may result in equipment breakdown. Make sure that the test will not damage the equipment or
endanger persons near the equipment!
INPUT TESTS – temperature sensors
1. Test for the presence of the refrigerant temperature sensor at the input to the heat exchanger (terminals
TEMP1, blue) - if the sensor is defective or the connection is incorrect, "Er-2" error flashes on the LED
display. Status of this input is permanently indicated by the LED below the display (blue LED is lit = module
communicates with the sensor).
2. Test for the presence of the refrigerant temperature sensor at the output from the heat exchanger
(terminals TEMP2, red) - if the sensor is defective or the connection is incorrect, "Er-6" error flashes on the
LED display. Status of this input is permanently indicated by the LED below the display (red LED is lit =
module communicates with the sensor).
INPUT TESTS – power request
The power request is processed by the module only if the operation of the compressor unit is enabled - closed
contact „ON (DI4). If a power demand is active at the module input and the operation of the compressor unit is
not enabled (contact ON is open), the device will not be activated.
If the operation of the compressor unit is blocked, but at the same time the power demand is active, this state
can be recognized by the case of the operation request letter on the display (e.g. "C4" = cooling request,
operation enabled, "c4" = cooling request, operation not allowed).
3. The analog input test is performed by applying a DC voltage of 0-10 V to the "POWER 0–10 V" terminals.
The display shows the value C0, C1,..., C7. Since we need 8 positions for the range 0-10 V, the voltage for a
change of one degree is about 1.4 V. (ATTENTION, at the same time "operation must be" - contact "ON"
closed.)
4. Test of logic (contact) input for power switching - disconnect the analog voltage and perform a test of logic
inputs, gradually connect the terminals "POWER 1st / 2st / 3st" with a suitable wire. When the "0V"
terminals are connected to the "DI2" terminal, power stage 1 is activated - the display shows the value C1.
When the "0V" terminals are connected to the "DI3" terminal, power stage 2 is activated - the value C3
appears on the display. When the "0V" terminals are connected to the "DI2" and "DI3" terminals at the
same time, power stage 3 is activated - the value C7 appears on the display. (ATTENTION, at the same
time "operation must be" - contact "ON" is closed.)
5. Logic (contact) input test for switching the operating mode - disconnect all power request and connect the
"MODE C / H" terminals with a suitable wire. When the "0V" terminals are connected to the "DI1" terminal,
the heat pump operating mode is activated - the "H0" character appears on the display. Now we connect
the power request - the corresponding request ("H1"....) Will appear on the display.
Example of displayed requests:
„C3 ... 6 ... 8""
„H2 ... 58 ... 37""
2020/07/23
page 17
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