Kaisai 06RY1, Service Manual

Page: 57 / 114

M thermal Mono
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Procedure 4.3.4
E1
The phase sequence of the 3-phase
power supply is incrorrect
1
Yes
Exchange any two of the 3 phase wires
No
Some power supply terminals are loose
2
Yes
Ensure all supply terminals are securely
fastened
No
The power supply is abnormal
Yes
Check the power supply equipment
No
Replace refrigerant system main PCB
Notes:
1. The A, B, C terminals of 3-phase power supply should match compressor phase sequence requirements. If the phase sequence is inverted, the compressor
will operate inversely. If the wiring connection of each outdoor unit is in A, B, C phase sequence, and multiple units are connected, the current difference
between C phase and A, B phases will be very large as the power supply load of each outdoor unit will be on C phase. This can easily lead to tripped
circuits and terminal wiring burnout. Therefore if multiple units are to be used, the phase sequence should be staggered, so that the current is distributed
among the three phases equally.
2. Loose power supply terminals can cause the compressors to operate abnormally and compressor current to be very large.
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M thermal Mono
202008 57
4.4 E2 Troubleshooting
Digital display output 4.4.1
Description 4.4.2

Communication error between outdoor unit and user interface.

Mono stops running.

Error code is displayed on hydronic system main control board for refrigerant system and user
interface.
Possible causes 4.4.3

Communication wires between outdoor unit and user interface not connected properly.

Communication wiring X Y E terminals misconnected.

Loosened wiring within electric control box.

Interference from high voltage wires or other sources of electromagnetic radiation.

Damaged main PCB or electric control box communication terminals block.
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