HVAC System Basics

Front

What is the blower interlocked with?

Back

The first heat strip.

Front

What does the line thermostat use?

Back

It uses line voltage

Front

What is RH?

Back

Positive heating.

Front

What is RC?

Back

Positive cooling.

Front

What is the difference between 'O' and 'B' in terms of the reversing valve?

Back

It refers to where the reversing valve is seated when rested.

Front

how does a sequencer work

Back

it uses a bimetalic disk as a heat sensitive componet to trigger the switch mecnahnism

Front

how does a fusible link work

Back

it melts when too much current pass trhough breaking the circuit

Front

how does a high limit switch work

Back

it monitor the temperature of the supply air and controls the blower fan and gas valve