Unit Controls Quiz

What does the ON-OFF switch do in the unit controls?

• It controls the defrost cycle.

• It energizes the electrical system of the unit.

• It controls the air pressure difference.

• It sets the thermostat temperature.

What happens when the Pre-Heat/Start Switch is held on START?

• The unit will defrost.

• The unit will stop operating.

• The engine starts to fire and pick up speed.

• The thermostat will be set to low speed.

What is the function of the MANUAL DEFROST SWITCH?

• It energizes the electrical system of the unit.

• It controls the air pressure difference.

• It allows the unit to defrost manually.

• It sets the thermostat temperature.

What does the THERMOSTAT control in the unit?

• The electrical system.

• The defrost cycle.

• The air pressure difference.

• The unit operation to maintain the trailer temperature.

What does the DEFROST AIR SWITCH sense?

• The electrical system.

• The air pressure difference between the evaporator coil inlet and outlet.

• The unit operation to maintain the trailer temperature.

• The defrost cycle.

How often does the DEFROST TIMER place the unit on Defrost?

• Every 2 hours.

• Every 4 hours.

• Every 6 hours.

• Every 8 hours.

What is the function of the DEFROST TERMINATION SWITCH?

• It energizes the electrical system of the unit.

• It controls the defrost cycle in response to the evaporator coil temperature.

• It senses the air pressure difference.

• It sets the thermostat temperature.

What does the CYCLE-SENTRY SWITCH select?

• The defrost cycle.

• The air pressure difference.

• Conventional continuous run operation or automatic Start/Stop operation.

• The thermostat temperature.