1
2
1
2
1
2
1
2
+ 12V
1
2
1
2
1
2
1
2
5
+
-
1
9
13
6
+
-
2
10
14
7
+
-
3
11
15
6
+
-
4
12
16
· P05, P06 setting value
Setting
value
Function
Setting
value
Function
0
Operation output
5
High pressure control output
1
Error output
6
Compressor operation time (Maintenance time) time-over output
2
Compressor ON output
7
Spare (Spare setting to be same as default setting.)
3
Fan ON output
8
Spare (Spare setting to be same as default setting.)
4
Oil return operation output
9
Spare (Spare setting to be same as default setting.)
External output
Function assignment
Code No.
Default setting value
CNZ1
P05
0
CNZ2
P06
1
Fig. 39
External Output Harness – Installation Manual
The harnesses take out operation and error signals from CO2 refrigerating machine.
(The 4-point unit relay needs to be provided at site.)
* Harness has connectors at both ends to prevent short-circuit by misconnection.
* External output is “Plus common DC 12 V output”. Coil resistance of contact relay must be 750Ω or higher.
CO2 control PCB
Red
CHN blue
CNY White
CNZ1 Red
CNZ2 Black
Red
Red
Red
Black
Black
Black
Black
External output
Operation output – CNH (Connector color: Blue)
Error output – CNY (Connector color: White)
7-segment setting output – CNZ1 (Connector color: Red)
7-segment setting output – CNZ2 (Connector color: Black)
<4-point relay (Provided at site)>
(Recommended) Omron G5D-F4E
Coil resistance 750Ω or more
<CNZ1, CNZ2 setting method>
CAUTION
• Have the harnesses installed by your dealer or specialized contractor.
• Electrical work must be made using dedicated circuit by qualified electricians.
• Source power supply to the CO2 refrigerating machine and external control panel must be turned off before starting work.
• Be sure to use the harnesses via the unit relay. Otherwise it could cause electric shock, or fire.
• Carefully read the installation manual of CO2 refrigerating machine, and observe the precautions.
External input harness (attached to the outside of control box) … 3 pcs.
Installation procedure
Circuit diagram
Blue … Operation
output (CNH (Blue))
Black
Black
Red
Red
Red … CNZ1 (Red)
White … Error output
(CNY (White))
Black … CNZ2 (Black)
1. Cut the harness at center to two pieces.
2. Attach a round terminal at end of each harness, and connect to the relay (provided at site)
3. Connect the connector to the CO2 refrigerating machine control PCB.
MOLEX 5557
User Guide | Optyma™ iCO2
© Danfoss | Climate Solutions | 2023.01 | LCA012A030
BC408445719305en-000101 | 47
