Bryant HVAC logo with white gear and power symbol on dark gray background

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

March 10, 2022

Ecobee 5 Setup for 2 stage with Dehum

One of the most popular combinations right now is the FV4 air handler with a 2 stage outdoor unit with a/c driven dehumidification. This combination is an awesome thing when it is adequately setup. When this system is installed and it is not setup or wired correctly it will not pull moisture from the home but instead cause the home to have higher humidity. I have made a guide to walk you through setup up and wiring this system to allow the homeowner to reap all of the benefits their system is capable of. This setup slows the blower down while running in the cool mode which causes the evaporator coil to be extremely cold. With the blower running slower and the coil being colder it allows more moisture to be removed from the air. If a home has high humidity due to infiltration, this setup will not correct their problem.


Sequence of operation for Dehum:


When dehum alone is needed (and overcool is setup) the unit will deenergize the ACC+ terminal and run the unit in cool. If overcool has been maxed out or has been set to zero then the thermostat will deenergize the ACC+ terminal but not run. The thermostat will wait for a cooling demand and deliver a reduced amount of airflow.

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