Alco Controls
Alco Controls
Alco Controls
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40<br />
<strong>Alco</strong> <strong>Controls</strong><br />
Block Diagrams<br />
EC2-35x / -37x Case Controller (EX2, Press/Temp)<br />
Inputs Outputs<br />
1 = Suction pressure 6 = EX2 Expansion valve<br />
2 = Coil out temperature 7 = Compressor (EC2-35x only)<br />
3 = Air in temperature 8 = Fan<br />
4 = Air out temperature 9 = Defrost heater<br />
5 = Defrost temperature 10= spare relay (EC2-37x only)<br />
EC2-21x / -29x Case Controller (TXV)<br />
6<br />
7<br />
9<br />
8<br />
Inputs Outputs<br />
1 = Digital Input 6 = Solenoid valve<br />
2 = Digital Input 7 = Compressor (EC2-21x only)<br />
3 = Air in temperature 8 = Fan<br />
4 = Air out temperature 9 = Defrost heater<br />
5 = Defrost temperature 10= spare relay (EC2-29x only)<br />
4<br />
3<br />
5<br />
Network<br />
2<br />
1<br />
EC2-31x / -39x Case Controller (EX2, Temp/Temp)<br />
Inputs Outputs<br />
1 = Coil in temperature 6 = EX2 Expansion valve<br />
2 = Coil out temperature 7 = Compressor (EC2-31x only)<br />
3 = Air in temperature 8 = Fan<br />
4 = Air out temperature 9 = Defrost heater<br />
5 = Defrost temperature 10= spare relay (EC2-39x only)<br />
EC2-11x Universal I/O Controller<br />
Inputs Outputs<br />
1 = Digital Input 6 = Digital output<br />
2 = Digital Input 7 = Digital output<br />
3 = Temperature input 8 = Digital output<br />
4 = Temperature input 9 = Digital output<br />
5 = Temperature input<br />
A2.5.1/1003/E
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