Alco Controls
Alco Controls
Alco Controls
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50<br />
<strong>Alco</strong> <strong>Controls</strong><br />
Block Diagrams<br />
EC3-81x Dual Circuit Rack Controller<br />
(4 + 3 compressors)<br />
Inputs<br />
1 = Discharge temperature inputs of 3 compressors<br />
2 = Suction pressure group A<br />
3 = Suction pressure group B<br />
4 = Serial alarm input for each compressor respectively<br />
5 = Refrigerant level alarm<br />
6 = Low pressure alarm group A<br />
7 = Low pressure alarm group B<br />
8 = High pressure alarm<br />
9 = Oil level alarm<br />
Outputs<br />
10 = For up to 4 compressors suction group A<br />
11 = For up to 3 compressors suction group B<br />
EC3-93x Rack and Condenser Controller<br />
(up to 4 compressors + condenser)<br />
Inputs<br />
1 = Discharge temperature<br />
2 = Ambient temperature<br />
3 = Suction pressure<br />
4 = Condensing pressure<br />
5 = Serial alarm inputs for 4 compressors<br />
6 = Low pressure alarm<br />
7 = High pressure alarm<br />
8 = Oil level alarm<br />
9 = Refrigerant level alarm<br />
10 = Serial alarms for 3 fans<br />
11 = Heat recovery demand<br />
Outputs<br />
12 = Up to 4 compressors<br />
13 = Up to 3 fans, from with 1 fan can be<br />
speed controlled<br />
14 = Speed controlled fan (see 13)<br />
15= Heat recovery solenoid<br />
16= to control a Digital ScrollTM A2.5.1/1003/E
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