Alco Controls
Alco Controls
Alco Controls
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<strong>Alco</strong> <strong>Controls</strong><br />
Block Diagrams<br />
EC3-65 Rack Controller for 8 single-stage compressors<br />
or 7 single-stage Compressors and 1 Digital Scroll TM<br />
EC3-67x Rack Controller for Capacity Controlled Compressors<br />
Inputs<br />
1 = Discharge temperatures of up to 8 compressors<br />
2 = Suction pressure<br />
3 = Discharge pressure<br />
4 = Serial alarm inputs for up to 8 compressors<br />
5 = Low pressure alarm<br />
6 = High pressure alarm<br />
7 = Oil level alarm<br />
8 = Refrigerant level alarm<br />
Outputs<br />
9 = for up to 8 compressors<br />
10= to control a Digital Scroll TM<br />
Inputs<br />
1 = Suction pressure<br />
2 = Discharge pressure<br />
3 = Serial alarm inputs for up to 6 compressors<br />
4 = Low pressure alarm<br />
5 = High pressure alarm<br />
6 = Oil level alarm<br />
7 = Refrigerant level alarm<br />
Outputs<br />
8 = 12 outputs for up to 6x2 / 4x3 / 3x4 capacity<br />
controlled compressors<br />
EC3-75x Condenser Controller<br />
Inputs<br />
1 = Ambient temperature<br />
2 = Humidity sensor<br />
3 = Condensing pressure<br />
4 = Serial alarm inputs for up to 6 fans<br />
5 = High pressure alarm<br />
6 = Heat recovery demand<br />
Outputs<br />
7 = For up to 6 stages, from which 1 can<br />
be speed controlled<br />
8 = Speed controlled fan (see 7)<br />
9 = Heat recovery solenoid<br />
A2.5.1/0810/E<br />
51
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