Timecodes
0:10 - TIP BIG FB
0:55 - Overview of how a furnace works
4:05 - First step is T: Thermostat
7:25 - Second Step is I: Inducer Draft Motor
8:24 - Ohming out the Inducer Draft Motor (no power present)
10:32 - Checking voltage on the Inducer Draft Motor (with power present)
11:24 - Third Step: Pressure switch. How does a pressure switch work?
15:30 - Checking a pressure switch with voltage when the Inducer is on
18:30 - Common reasons why a pressure switch will not close
22:00 - What are inches of water column and a manometer?
23:36 - What do the numbers on a pressure switch mean?
24:50 - Using a manometer to check inches of water column coming from the Inducer
27:22 - Fourth Step: Board (Safeties). Some common safeties are high limits and flame roll outs
29:43 - Using a lighter to trip the flame roll out
32:36 - Closer look up of safeties found in a Furnace
39:00 - High limit trips because of no airflow
42:00 - How does the Molex connector on the control board work?
In this video, we will be going over the acronym TIP BIG FB. Each letter represents a step in the sequence of operation.
T: Thermostat
I: Inducer Draft Motor
P: Pressure Switch
B: Board (Safeties)
I: Ignition (Hot Surface Igniter)
G: Gas Valve
F: Flame Rectification (Flame Sensor)
B: Blower Motor
We will be going over the first four steps in part 1, from thermostat to safeties. This is a longer video than usual, but I promise you will learn some things if you stick to the end.
Only professionals in this trade should attempt to work on live equipment.
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