Airwell SX 12 DCI, Service Manual

Page: 44 / 86

CONTROL SYSTEM
SM YAZ318 1-A.1 GB
11-3
Capacity group
Capacity Code
0 (2.0 - 2.9kw) 1.2
1 (3.0 - 3.9kw) 1.5
2 (4.0 - 4.9kw) 1.7
3 (5.0 to 6.0) 2
4 (6.1kw and above) 3
11.3.1.1.2 Indoor Total Capacity Test
This test is performed only for Multi split units.
The test comes to check the total IDU capacity code to match the outdoor unit capacity.
The capacity groups of the IDU’s are translated into capacity codes according to the
following table:
Capacity group
Capacity Code
0 1
1 1.5
2 1.7
3 2
4 3
For Model S (YBD022/YAZ318)
Total Detected IDU Code (Sum of IDU code)
Detected IDU units Minimum Allowed Maximum Allowed
3 2 4.5
Whenever the sum of the IDU code is outside the range the unit will be forced to Idle Mode and
report: “
Mismatch between IDU and ODU models
”.
If the unit is forced to Idle Mode, then it will keep checking this condition (the indoor total capacity
test) in order to prevent system latch up. Once the condition is fine, the fault will be cleared and the
unit will proceed to normal operation.