Bryant logo: white gear and power symbol on dark gray with red Bryant banner.

This symbol is for an equipment ground- almost any time you see three lines parallel either horizontally or vertically- they will mean earth/ ground.



Here is an Outdoor Fan Motor where you can see it contains two windings, Start and Run. Also, in green is another symbol for ground

Pulled from an indoor ceiling cassette 40MBCQ

The chart/table on outdoor units have loads more of information so I will assist in clarifying.

These units are more complex and have more variables to consider.


*to keep things simple, we typically round close decimal numbers*


Min. Piping Length per each indoor unit- This is the minimum allowed amount of lineset for each indoor unit


Standard Piping Length per each indoor unit- this is the amount of lineset that has been “reserved” for each indoor unit for refrigerant charge purposes.


Max. outdoor-indoor height difference- how far you can separate the indoor from the outdoor vertically. Two labels are shown- IU indoor unit above OU outdoor unit and vice versa.


Max. height different between indoor units- if the indoor units are on different levels, then they should not exceed this amount of vertical separation amongst themselves.


Max. Length per each indoor unit- no indoor unit should have a lineset longer than this number. Do not exceed this number for any indoor unit lineset.


Max. Piping Length with no additional refrigerant charge- add together all of the lineset lengths for all the indoor units. If your lengths are above this number, then additional charge is needed.


Total Maximum Piping Length per system– when adding together all the indoor pipe lengths, this is the total length that the unit can support. Pipe lengths greater than this are not approved nor recommended.


Additional refrigerant charge- if your total lineset length is over the “Max. Piping Length with no additional refrigerant charge” amount, this is how many ounces per foot should be added to the unit for proper operation.


Pipe sizes: these show the pipe sizes with an asterisk (*) and then the quantity of those ports.

For example: from the 36K– 1/2 *2+3/8*2

This means 2 at ½ and 2 at 3/8.


In the event that the correct line set size is ran and it is not the same size as the hookup of this unit, use the factory supplied adapters to make the connections.

Steven Simmons

Technical Services Manager Southwest District

November 12, 2021

What Is An Electrical Short?

Everyone has heard the phrase: “it’s shorted.” What does this actually mean and how do you diagnose it? Let’s start answering that question by analyzing the formula for Ohm’s Law.


The Ohm’s Law: Formula is V=I × R

V is Voltage

I is Amperage

R is resistance

You can arrange this equation 3 different ways:

Voltage= Amps × Resistance

Amp= Voltage ÷ Resistance

Resistance= Voltage ÷ Amps


Now, back to the question at hand.


Let’s use an example of Ohm’s Law with a single phase 5KW(4800 Watts) electric heater at 240vac. If you have been in the HVAC industry for any length of time you have probably memorized that this heater will be pulling 20 amps right? But why?


If you ohm out a 5KW(4800 Watts) heater with a multimeter you will get 12Ω or 12 ohms (ohms is what resistance is measured with).


Using the formula for Amps from above, we can figure out why it is 20 amps.


Amp= Voltage ÷ Resistance

Amps=240vac ÷ 12Ω

Amps = 20


If the resistance of the heater were to become lower, it would cause our amps to increase. In the heat strip drawings: the top heater would represent a good circuit, the second (lower) heater would represent a circuit that the element has sagged and is now touching (in the red circle) which has created a “shorter” path for electricity to flow through.





When the path between L1 and L2 becomes shorter, it causes there to be less resistance between them than there should be. The shorter the electrical path is, the less resistance the path has. If the resistance were to be checked on the 2nd heater it would definitely be less than 12Ω. Let’s see an example if it were reading 2Ω using the same formula as above:


Amp= Voltage ÷ Resistance

Amps=240vac ÷ 2Ω

Amps = 120


This heater would be considered “electrically shorted” and would draw significantly more amps than what it was designed to. This would cause the breaker or fuse that is protecting the power wires feeding the heater to trip or blow.


If you have a fan motor, compressor winding, contactor coil, etc. that is a probable cause for drawing too many amps or blowing a fuse. You could check the ohm value of the electrical circuitry of that device and compare that value to what it is supposed to be.


An electrical short can be described as follows: when the resistance between any two points in an electrical device has become lower than what it is supposed to be, causing the amperage to increase.

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