Electrical Theory an Application for HVACR

Electrical Theory & Applications for HVACR

Student Worksheet

Page 89

Chapter 4: Understanding Wiring Diagrams

Name _______________________________

Date _____________________

1. How many line voltage “loads” are shown in the

diagram?

2. How many low voltage “loads” are shown in the

diagram?

3. What relay controls the condenser fan motor?

4. What switches must be closed to energize the

control relay coil?

5. How many sets of contacts are controlled by the

control relay coil?

6. With the “FAN” switch in the “CONT” posiƟon, what effect will closing of the thermostat have on the

indoor fan relay?

7. When does current flow through the transformer primary?

8. With the “FAN” switch in the “AUTO” posiƟon, will the indoor fan start before the condenser fan motor?

9. How is the “COOL” switch operated?

10. Not counƟng the fused disconnect, how many contacts are in the compressor contactor coil load line?