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For proper system operation, each communication cable has to be connected to the corresponding indoor unit, following the
refrigerant tubes. This means that the communication lines Ca, Cb, Cc, and Cd has to be connected to the indoor units A, B,
C, and D respectively.
To serve this purpose the system is designed to have the "Installation Test Mode". When this mode is set, the unit verifies
whether the correct connections were made or not.
Notes:
1. The miswiring check cannot be performed while outdoor temperature is below 5 C. In this situation the display will show
"OAT".
O
2. The miswiring check cannot be performed if some components in the unit are out of operation. In this situation the
display will show the error code "xxx".
3. The indoor units are turned automatically to installation test mode, no need to turn them on.
Please follow all the steps below:
1. Make sure all wiring and piping to indoor units are properly connected.
2. Turn on the power breaker.
3. by scrolling down to installation test (it) press the "Down" button until "it" shows on the display and
then press select for entering installation test mode.
Enter the Test
4. During installation test the system works without the installer interference. It can be observed that the compressor,
outdoor fan and indoor fans are stopped and starts according to preset procedure.
5. The system exits installation test either by continuous press on the escape button for 5 seconds or when the system
finishes installation test by itself after 20 to 40 minutes.
6. After installation test, the system stops for 5 minutes, and then it resumes its normal operation. The judgment code is
shown on the display - either "pass" or "fail".
7. Upon the judgment code, if required, the installer should correct the communication wiring.
INSTALLATION TEST MISWIRING CHECK
6
1. Outdoor Temperature below 5 C
O
2. Unit malfunction (example: code O01)
Display Board
Select
Esc
Up
Down
2. Select
1. Scroll
Down
Entering miswiring check
Display Board Menu list
Outdoor Unit (oxx)
Indoor Unit A (axx)
Indoor Unit B (bxx)
Indoor Unit C (cxx)
Indoor Unit D (dxx)
Technician Test Cool (ttC)
Technician Test Heat (ttH)
First IDU Wins (idu)
IDU A is master (a-p)
IDU B is master (b-p)
IDU C is master (c-p)
IDU D is master (d-p)
'Forced mode' input (Frc)
Technician Test (tt)
Installation Test (it)
Diagnostics (dia)
Set Up (Stp)
Installation test passed with success Installation test fail
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