11-4
CONTROL SYSTEM
SM YAZDCI 1-A.1 GB
111. CONTROL
SYSTEM
11.3.1.1 IDU’s
Initializatio
11.3.1.1.1 Capacity Codes Setting
The capacity groups of the IDU’s are translated into capacity codes according to the
following table:
Capacity group
Capacity Code
0 (2.0 - 2.9kw)
1
1 (3.0 - 3.9kw)
11.5
2 (4.0 - 4.9kw)
Reserved
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
11.5
2
Reserved
3
2
4
3
For Model P:
Total Detected IDU Code (Sum of IDU code)
Detected IDU units
Minimum Allowed
Maximum Allowed
1
2
2
2
2
4
3
3
5.5
4
4
6
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.
11.3.1.1.3 Model Plug & Indoor Capacity Test
This test is performed for both single split channel and multi split channel:
Test
How to check?
Error to report?
System Action
(ODU Mode)
Jumper is inserted/DIP
is configured
ODU model is 0 (zero).
“Missing ODU configuration”
Force to Idle mode.
Jumper/DIP is not
defined in the software
ODU model is not P.
“Undefined ODU model”
Force to Idle mode
IDU-ODU capacity
group mismatch
When ODU model is P,
and the capacity group is
not allowed.
“
Mismatch between IDU and
ODU models “
Force to Idle mode
