1. What is the purpose of a lockout relay in a condensing unit control circuit?

2. What is the purpose of a compressor short-cycle timer?

3. The purpose of a motor starter is to .

4. To what does the term differential in a thermostat refer?

5. When checking the voltage drop across the contacts of a compressor contactor, you should replace the
contactor at what level of voltage drop?

6. Which of the following is not a common feature of an electronic thermostat?

7. In a standard thermostat wiring scheme, the R wire represents

8. Which of the following is a reasonable location for a room thermostat?

9. In the electrical control circuit of a packaged heating/cooling system, the outdoor fan motor typically

10.

Refer to Figure RQ01. Which component causes the indoor fan to cycle on and off with the
compressor in the cooling mode?

11. Refer to Figure RQ01. Which component can prevent the compressor from starting immediately on a
call for cooling from the thermostat?

12. Refer to Figure RQ01. Which component prevents the low- and high-speed windings of the indoor
fan motor from being energized at the same time?

13. Refer to Figure RQ01. When is the time-delay relay energized?

14. When a contactor coil somehow becomes grounded, what would you expect to discover as you begin
troubleshooting?

15. Refer to Figure RQ01. Which component prevents the main gas valve (GV at terminals 1 and 2) from being energized on a call for heat from the thermostat immediately after the pressure switch (PS) closes?