Review 4-6

Meters used in the HVAC industry?

• Are only analog.

• Measure only one charecteristic of a circuit.

• Usually measure multiple charecteristics like voltage, amps, ohms and often more.

• Are not able to measure voltage.

A single pole double throw switch is able to?

• Connect a common point to either one of the two poles depending on the position.

• Energize 2 loads at the same time.

• Double the voltage throw to the loads.

An open on rise pressure switch

• Is shown with the switch blade above the dot on the end.

• is shown with the switch blade below the dot on the end.

• Is shown with the switch blade not touching either end.

• Is not important

An open on rise thermostat is used for?

• Refrigeration

• Air conditioning

• Heating

• An indicator lamp

A closes on rise thermostat is used for ?

• Heating

• Air conditioning

• Fan control

• Both b and C

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-4

A contactor used for residential AC condensing units ?

• Single pole 208 volt coil

• Double pole 120 volt coil

• Double pole 24 volt coil

• triple pole 208 volt coil

The line voltage to the condensing unit in a residential system is?

• 24 volts

• 120 volts

• 240 volts

• 480 volts

The line voltage to a residential furnace is usually?

• 240 volts

• 120 volts

• 208 volts

• 24 volts

A residential thermostat is usually?

• 24 volts

• 120 volts

• Line voltage

• Wireless

A heat pump Utilizes what to accomplish both heating and cooling?

• A special compressor

• A reversing valve

• An oversized condenser

• A flux capacitor

Tags

NGSS.HS-PS3-4