Can somebody please help me with my study

[jbomba]

Hi there in my studys i have been asked to draw a ladder diagram for the control circut of a freezer room. I mainly deal with a/c on a daily basis and do not do much refrigeration work. Can somebody please give me an example of the following control circut. If not exact something similar.? I dont really have anything to study from so your help would be greatly appreciated.

Draw a ladder diagram for freezer room electrical control circut. Show the correct sequence of all controls, these should include the following, use the abbreviations for annotating each component.

1. TS - Temperature Control
2. LP - Low pressure switch
3. HP - High Pressure Switch
4. OFS - Oil Pressure Differential switch
5. DS - Differential Switch Contacts
6. OFH - Oil Failure Heater
7. DTM - Defrost Timer Motor
8. DTC - Defrost Time Clock
9. DH - Defrost Heaters
10. DHOD - Defrost Overheat Control
11. CC - Compressor Contactor ( show where applicable N/O normally open contacts, N/C normally closed contacts)
12. C - Compressor
13.COD - Compressor Motor Overload Switch
14. CFM 1 & CFM 2 - Condenser Fan Motors
15. CFCN/O - Condenser Fan Contactor Normally Open Contacts
16. CFMPS - Condenser Fan For Head Pressure control, one fan only
17. EFC - Evaporator Fan Contactor(has two normally open contacts)
18. EFM 1 & EFM 2 - Evaporator Fan Motors
19.EFMDS - Evaporator Fan Door Operated on/off Switch
20.LLSV Liquid Line Solenoid For Off Cycle Pump Down
21. CCH - Crank Case Heater
22. LS - Light Switch
23 L - Light

[Toosh]

Hi there in my studys i have been asked to draw a ladder diagram for the control circut of a freezer room. I mainly deal with a/c on a daily basis and do not do much refrigeration work. Can somebody please give me an example of the following control circut. If not exact something similar.? I dont really have anything to study from so your help would be greatly appreciated.

Draw a ladder diagram for freezer room electrical control circut. Show the correct sequence of all controls, these should include the following, use the abbreviations for annotating each component.

1. TS - Temperature Control
2. LP - Low pressure switch
3. HP - High Pressure Switch
4. OFS - Oil Pressure Differential switch
5. DS - Differential Switch Contacts
6. OFH - Oil Failure Heater
7. DTM - Defrost Timer Motor
8. DTC - Defrost Time Clock
9. DH - Defrost Heaters
10. DHOD - Defrost Overheat Control
11. CC - Compressor Contactor ( show where applicable N/O normally open contacts, N/C normally closed contacts)
12. C - Compressor
13.COD - Compressor Motor Overload Switch
14. CFM 1 & CFM 2 - Condenser Fan Motors
15. CFCN/O - Condenser Fan Contactor Normally Open Contacts
16. CFMPS - Condenser Fan For Head Pressure control, one fan only
17. EFC - Evaporator Fan Contactor(has two normally open contacts)
18. EFM 1 & EFM 2 - Evaporator Fan Motors
19.EFMDS - Evaporator Fan Door Operated on/off Switch
20.LLSV Liquid Line Solenoid For Off Cycle Pump Down
21. CCH - Crank Case Heater
22. LS - Light Switch
23 L - Light

Hi Read through this document start at page 33 then scroll to near bottom of page for diagrams it is a pdf file you might have to down load a adobe reader. I also recomend you try searching before asking for help

http://www.heatcraftrpd.com/res/pdf/H-IM-64L-002.pdf



Good Luck
Norm :)