Service manual

12-18
CONTROL SYSTEM
SM CINCO 1-A.1 GB
12.5.2.1 Compressor Min On/Off time
Compressor minimum ON and OFF time is 3 minutes except during protections.
12.5.2.2 Compressor Startup
When started, compressor speed reaches certain level (usually 30÷40 RPS) and will not go below that during the
first 5 minutes except when compressor is forced OFF.
12.5.2.3 Compressor start up fail
If the compressor does not succeed to complete the startup procedure, it will report a compressor lock fault code.
It than retries the startup procedure every 10 seconds and up to 3 minutes than it wait 3 minutes before starting
the next compressor startup sequence.
12.5.2.4 Compressor operation while OFAN Error
In case an OFAN error a cured for 10 continues seconds and the compressor is on, the compressor will be set to
OFF until OFAN error will recover.
12.5.2.5 Speed Change Limitations
Acceleration and deceleration will be 1 RPS/sec.
12.5.2.6 Speed Step Limitations
The compressor speed cannot go below Step1Freq or above Step2Freq during 3 continuous minutes once
after the compressor starts up. The speed cannot go higher than Step3Freq RPS during the first 10 minutes of
continues compressor operation.
12.5.2.7 Illegal frequencies
Illegal Frequencies are values that the unit is not allowed to be working at. The frequencies and values within
tolerance of ±2 Hz are not allowed.
12.5.2.8 Compressor shutdown Cases
№ Shutdown Reason
1 ODU NLOAD=0 (or IDU protections)
2 IDU Shutdown (idle)
3 Deicing (both when going from heat to cool and from cool to heat)
4 ODU Protections
5 Sensor faulty (CTT, HST or OCT+OMT)
6 HPS protection
7 LPS protection
8 OFAN-ERR (Up and Down)
12.5.2.9 Outdoor Unit NLOAD calculation
Indoor Unit-A Indoor Unit-B Indoor Unit-C Indoor Unit-D Indoor Unit-E
Outdoor Unir
Control
NLOADa, CODEa NLOADe, CODEe
NLOADd, CODEd NLOADb, CODEb
NLOADc, CODEc
Total load = Code * NLOAD/ODU CODE