Hitachi RAC-112SQB, Installation Manual

Page: 16 / 20

16
5. Test Run and Handover
5-1 Test Run
Precautions for Test Running
1) Check insulation impedance between electrical terminals and earth with a 500V insulation tester. Impedance must be over 1M Ω .
Re-check insulation impedance if it is below 1M Ω .
2) Make sure the interceptor valve of the outdoor unit is fully open before test run.
3) As the main switch is open phase, the alarm code on the remote control is “05” when operating the unit. Check power supply and related
equipment.
4) Check if the oil heater is operating.
5) Connect to the power supply for at least 12 hours before test run.
6) When operating the cooling function, room temperature must be over DB21.5ºC and WB16ºC, and outdoor temperature over DB0ºC.
7) Connect the pressure meter according to the piping precautions (p.9) when releasing pressure from the pipe union.
compressor is stagnant. The ELCB will trip when insulation impedance is below 1M Ω . Re-check to verify the following:
Verification contents
①
Disconnect the compressor from power supply and measure the insulation impedance of compressor. When impedance is below
1M
Ω , other electrical parts may be poorly insulated.
Note: When re-connecting the compressor cables, make sure flag terminals are securely locked. Adjust terminal clamping pressure
with a pair of clamps before inserting and locking on the terminal block.
①
Press the Run/Stop and CHECK buttons on the remote control at the same time for 3 seconds or longer.
“Test Run” and “Connected No. of Indoor Units” will be shown on the LCD display. When multiple units are connected, check the
total number of connected indoor units. If the number of connected units shown on the LCD display is smaller than the actual
number of connected units, check if there is poor wiring. Then, press the
Run/Stop again to set the desired operation model.
②
Press the Run/Stop button
The operation indicator illuminates and operation starts. The program will shut down the unit after 2 hours automatically. On the
LCD display, the information reads: “TIMER OFF” “2 H”. Although temperature adjustment is disabled after test run in “
①
”, the
protective device is effective during unit operation.
③
Press the LOUVER button on indoor units equipped with the auto swing function to verify the deflector response. Press the
LOUVER button again to stop the deflector.
Please look up the error, its cause, and troubleshooting in p. 19. Contact a service technician for help if the situation persists.
When the operation light blinks every 2 seconds repeatedly, this means there is a signal transfer error between the indoor unit and
the remote control (wires are loosened or disconnected, broken; incorrect wiring, etc.).
y A giggle sound also comes out from the mechanical chamber of the outdoor unit after compressor start and stop or defrosting
start and stop. This is because of the pressure difference inside the pipes. It is normal and not a problem.
About Insulation Impedance
Abnormality
Occurred
Setting Temperature
Content of Abnormality
(Alarm Code)
Abnormality
Indoor Unit NO.
Abnormality Indoor
Unit Refrigerant
Cycle
(Display in sequence)
Unit Type (Unit Code)
Total Number of Indoor Units That The
Same Refrigerant System With The
Abnormal Indoor Unit.
Setting Timer Part of The Display
Setting Temperature Part of The Display
● If the EL CB trips, check if the rated capacity of the EL CB meets the requirements as shown in p. 14.
Use ELCBs for inverters (<30mA) or high-sensitivity ELCBs (trip time<0.1 second).
y When there is a giggle sound coming out from the mechanical chamber of the outdoor unit after installa tion, it is the activation
sound of the electronic valve. It is normal and not a problem.
1) Test run after completing indoor unit installation before handing over to the customer. Follow the
steps below to run test and verify if there are abnormalities.
④
Test Run will end in two hours (automatically) or by pressing the Run/Stop again. When the protective device activates after an
abnormality occurs, the operation light on the remote control will blink to alert an “abnormality” has occurred, and the error code
will appear on the temperature display section on the remote control at the same time.
y Display change on the temperature and timer display sections:
Impedance measured with the 500V insulation tester must be over 1M Ω . Re-check insulation impedance if it is below 1M Ω .
● During test run or after disconnecting from the power supply for a long time, insulation impedance reduces, as refrigerant in the
②
When the insulation impedance of compressor is below 1M Ω , remove wires connecting the compressor and the inverter
mainboard before installation . Measure insulation impedance again after installing the oil heater for three hours. If impedance
is normal, there is no problem with the compressor. Otherwise, there may be a compressor problem.
(Extend
installation as necessary based on the air condition and refrigerant status in the pipe.)