Midea Mini C Series Service Manual page 53

Mini C Series VRF 50/60Hz
Communication wires are close to a source
of electromagnetic radiation such as
transformer or strong fluorescent lamp
The length of communication wire is over
Clear all indoor unit address by setting
switch S1 and then automatically
addressing indoor unit by setting S1 too
repower on to confirm whether fault clear
Replacing outdoor main PCB resolves the
Replace electric control box
communication terminals block
Notes:
1. Measure the resistance among P, Q and E. The normal resistance between P and Q is 120Ω, between P and E is infinite, between Q and E is infinite.
2. S1 switch setting as below table, the switch is different for 80 model and 100-160 model; for every times setting, you need to repower on to make the switch
dial function works.
Switch model
80
S1
100-
160
 Press indoor unit's receiver button for 5 seconds, the indoor unit's communication address code displayed.
Table 6-2.1: Communication address code
Director light
Code
 Press it for 10 seconds, power code displayed. Check each unit's address code.
Table 6-2.2: Power code
Address
Capacity (×100W)
HP
For example:
Press the button for 5 seconds:
If the "running" and "warning" lights are normally on, that means the address code is 9=(8＋1)
If the lights are blink, the address code should plus 16, so the address code is 25=16＋(8＋1)
Press the button for 10 seconds:
If the "timer" and "warning" lights are normally on, that means the capacity code is 5=(4＋1) and the capacity of indoor unit
52
No
No
1200m
No
2
,
No
error
No
Switch positions
S1-1 is ON, indicating Clearing of indoor unit address
S1-1 is OFF, indicating automatic addressing (OFF by factory default)
S1-2 is ON, indicating forced implementation of old indoor unit protocol
S1-2 is OFF, indicating automatically adapting to indoor unit protocol
Running Timer
8
0 1 2
22 28 36
0.8 1.0 1.2
Remove the source of interference, or
Yes
add additional shielding to the
communication wires
Reduce the wire length to less than
Yes
1200m or strengthen the signal
Some indoor unit address repeat,
Yes
Description
Fan/defend cold fan
4 2
3 4 5
45 56 71
1.6 2.0 2.5
maintain to use
Warning
1
6 7 8
80 90 112
3.0 3.2 4.0
9
140
5.0