Service manual

12-7
CONTROL SYSTEM
SM CINCO 1-A.1 GB
The following combinations show the allowed and not allowed capacity group:
ODU Model Communication channel
Is it allowed capacity group?
Indoor Capacity
01234
AB (4HP DCR and
CINCO)
Single No No No No Yes
Multi
Com Channel 1 Yes Yes No No No
Com Channel 2 Yes Yes No No No
Com Channel 3 Yes Yes No No No
Com Channel 4 Yes Yes No Yes Yes
Com Channel 5 Yes Yes No Yes Yes
12.3.3.4 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
Non Connected unit 0
0 1.0
1 1.5
2 Reserved
32
43
Total Detected IDU Code (Sum of IDU code)
Detected IDU units Minimum Allowed Maximum Allowed
1 MinSumCapCode1 MaxSumCapCode1
2 MinSumCapCode2 MaxSumCapCode2
3 MinSumCapCode3 MaxSumCapCode3
4 MinSumCapCode4 MaxSumCapCode4
5 MinSumCapCode5 MaxSumCapCode5
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”.
12.3.4 Active Unit definition
Indoor unit can be active or inactive. Whenever it is active, it is calculated to the outdoor unit load. Whenever it is
inactive, the outdoor unit is NOT calculated to the outdoor unit load.
12.3.5 Temperature Measurements
12.3.5.1 Thermistors default value.
Thermistor Default value System Reaction
COOL HEAT
OCT 1°C 1°C
(1)
OAT 43°C 6°C
CTT 43°C 43°C Forced compressor to OFF
HST 75°C 75°C Forced compressor to OFF
OMT 43°C 43°C Replaced by OCT
(1)
RGT 43°C 43°C
RLT 43°C 43°C
ICT 43°C 43°C
RAT SPT+4°C SPT-4°C
Notes:
(1) Whenever both OCT and OMT are faulty the compressor will be forced to OFF.
(2) Thermistor is defined as faulty (shorted/disconnected) if it’s faulty for more than 10 seconds continuously.
During this time, the system uses the last valid temperature