2020/07/23 page 16
INPUT TESTS
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-02” error flashes on the LED
display. If the sensor is connected correctly that is the white wire is connected to the white terminal, the
relevant LED illuminates (left, blue underneath the displays on the PCB).
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-06” error flashes on
the LED display. If the sensor is connected correctly that is the white wire is connected to the white
terminal, the relevant LED illuminates (right, red underneath the displays on the PCB).
Both thermometers are the same and therefore exchangeable in terms of the functionality. Color coding is
only used to identify the purpose and use.
3.
An analogue input test is carried out by applying DC voltage of 0-10V to the "POWER 0..10V" terminals. The
display shows C0, C1 ... C7. Because we need 7 positions for the 0-10V range, the voltage change by 1
level corresponds to 1.4V (approximately).
4.
Test of the logic (contact) input for power switching - disconnect the analogue voltage and test the logic
inputs. Use a suitable conductor and gradually connect the "POWER 1ST / 2ST / 3ST" terminals. When
connecting the "0V" (No.13) terminals with the "DI2” (No.15) terminal, the power level 1 is activated - the
display shows C1. When connecting the "0V" (No.13) terminals with the "DI3” (No. 16) terminal, the power
level 2 is activated - the display shows C4. When connecting the "0V” (No.13) terminals with the "DI2”
(No.15) and at the same time the “D13” (No. 16) terminal, the power level 3 is activated - the display
shows C7.
5.
Test of the logic (contact) input for operating mode switching - disconnect all power requirements and
connect the "MODE C / H" terminals using a suitable conductor. When connecting the "0V” (No. 13)
terminals with the "DI1” (No. 14) terminal, the heat pump mode is activated - the display shows “H0”. Now
connect the power request - the corresponding request ("H1" ...) appears on the display.
OUTPUTS TESTS
6.
Fault /error message test - for example, if you disconnect the TEMP1 temperature sensor, an error occurs
and it is shown on the display “Er-02 - Er-02 - Er-02……”, and the output ERROR opens the contact (No.
21+22).
7.
Test of the DEFROST output function starts when the power supply is connected. The DEFROST output
(No.19 + 20) closes for approximately 1s.
Notice: This output is necessary for correct operation of the “HVAC-compressor unit" working in the "heat
pump" mode. The superior HVAC control system must ensure the appropriate response of the HVAC
system.
After testing, check the tightness of bushings and reinstall the cover of the installation box and inspect visually
for tightness.
6.4 Inspection of settings during operation
During operation, without deactivating the supply voltage, the set power code, the address for central control
(MODBUS) and the last 10 device error states can be verified
.
1.
Hold the SETTINGS button for approx. 5 s.
The display shows the set power code in
kW
.
2.
Hold the SETTINGS button for approx. 5 s.
The display shows the set address for MODBUS communication. This address is usable (same) for LG
central control systems.
