Deck 44: Packaged Units: Electric Air Conditioning and Gas Heat

Question 1

Most door interlock switches are designed so that they are actually a two-position switch.

Answer 1

True

Question 2

Troubleshooting for electronic circuit boards is ____ accomplished only by determining if the board has the proper input information to obtain an output.

A) always
B) generally
C) never
D) sometimes

Answer 2

generally

Question 3

A packaged unit schematic typically contains separate references for the air conditioning compressor and condenser fan.

Answer 3

False

Question 4

Lock-out protection involves the use of a ____ that becomes connected in series with the compressor contactor coil in the event of a problem with the compressor circuit.

A) low-pressure relay
B) CC coil
C) LOR coil
D) high-impedance relay

Question 5

The compressor lock-out relay can operate only when the thermostat is set in the heating mode.

Question 6

In a basic lock-out circuit, the coil of the lock-out relay may be connected in parallel with the normally ____ safety switches used to help protect the compressor.

A) open
B) semi-closed
C) closed
D) semi-open

Question 7

In troubleshooting for electronic circuit boards, if the inputs and outputs are correct, the problem probably lies somewhere within the circuit board.

Question 8

The function of the door interlock switch is to permit the unit to operate only when ____.

A) the AGV is energized
B) the furnace door is closed
C) power is applied
D) the unit is in the heating cycle

Question 9

In the cooling cycle of a packaged unit, the indoor blower fan is controlled by the fan switch.

Question 10

When the heating thermostat contact closes, a circuit exists to the time delay relay (TDR) and ____.

A) condensing unit
B) door interlock
C) lock-out relay
D) draft motor relay (DMR)