HVAC System Quiz

What happens when the unit starts because of low engine block temperature?

• The unit will not start.

• The unit will start and operate in the defrost mode.

• The unit will start and operate in the cooling mode.

• The unit will start and operate in the heating mode.

What is the temperature rise limit for the evaporator coil in defrost mode?

• 1°F (0.6°C)

• 2°F (1.1°C)

• 3°F (1.7°C)

• 4°F (2.2°C)

What is the function of the thermostat controlled all-season temperature control?

• To control the engine speed.

• To keep the batteries fully charged.

• To maintain ambient conditions.

• To control the temperature in low ambient conditions.

What is the purpose of the variable glow plug preheat time?

• To reduce engine wear.

• To improve fuel efficiency.

• To ensure proper engine start.

• To reduce emissions.

What happens in High Speed Cool mode when the temperature is over 3.4°F (1.9°C) above set point?

• The unit will shut down.

• The unit will switch to Low Speed Cool.

• The unit will continue to run in High Speed Cool.

• The unit will switch to heating mode.

In Low Speed Cool mode, what happens when the temperature is 1.7°F (0.9°C) below set point?

• The unit will switch to High Speed Cool.

• The unit will shut down.

• The unit will continue to run in Low Speed Cool.

• The unit will switch to heating mode.

What is the temperature range for the thermostat lockout in High Speed Cool mode?

• 1.7°F (0.9°C) below to 3.4°F (1.9°C) above set point.

• 2°F (1.1°C) below to 4°F (2.2°C) above set point.

• 1°F (0.6°C) below to 2°F (1.1°C) above set point.

• 3°F (1.7°C) below to 5°F (2.8°C) above set point.