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12-23
CONTROL SYSTEM
SM DLSDCI 3-A.1 GB
12.6
Thermodynamic Protections
12.6.1
IDU Protections
12.6.1.1 Condensate Water over Flow Protection
TROUBLESHOOTING
Service Manual
Multi Cinco 100 DCI
12-32
Revision 0
12.6.5
Condensate Water over Flow Protection
Each of the pins P1, P2, P3 can have two options:
1 – When it is shorted with P4
0 – When it is not shorted to P4
12.6.5.1
3 Level Logic
Used in Floor/Ceiling models.
P2
P3 Level
0
0 L0
1
0 L1
1
1 L2&3
0
1 L4
Water Level
ANY
0
BLINK
NLOAD
OPER LED
LEVEL1
LEVEL2&3
LEVEL4
NORMAL
ON
Pump
OFF
On
Off
Overflow signal
to ODU
12.6.5.2
1 Level Logic
Used in all models except for Floor/Ceiling models.
P2
P3 Level
Don’t care
1
Normal
Don’t care
0
Overflow
Each of the pins P1, P2, P3 can have two options:
1 – When it is shorted with P4
0 – When it is not shorted to P4
P2
P3
Level
Don’t care
1
Normal
Don’t care
0
Overflow
ANY
0
ON
NLOAD
PUMP
OFF
ON
OPER
LED
OFF
Overflow
Water Level
Normal
BLINK
NLOAD is
forced to 0
8 min
8 min
Overflow when
unit is ON
Overflow when
unit is OFF
8 min
12.6.2
ODU Protections
12.6.2.1 Protection types
There are 2 types of protection: Thermodynamic protections and Cut-Off protection
Thermodynamic
Cut-Off protection
Compressor AC Over Current
Low Pressure Switch
Compressor DC Over Current / Driver Overload
High Pressure Switch
Heat Sink Overheating
Water Overflow
Indoor Coil Overheating
Exceeding Operating Conditions
Outdoor Coil Overheating
Compressor Overheat Protection
Indoor Coil Defrost
12.6.2.2 Protection status
Thermodynamic protections are based on reducing compressor frequency when needed. The following represent the
possible protection status and their actions