Motor Run Capacitors Color Code And Terminal Identification


Motor Run Capacitors

In this article we will discuss, the color and terminal identification codes for motor run capacitors in an HVAC system, and also we will see how we can identify them to replace the capacitors.

HVAC Capacitor Wires Number of Terminals, Wire Color Code and Terminal Identification Code

If the HVAC motor run capacitors have three terminals, they are marked. If the HVAC fan motor capacitor has only two terminals at the top, they will be a common F and C fan.

  • F = fan
  • H = Herm / Compressor
  • C = COM (connected to the connector to the power capacitor)
    HVAC Engine Standard Terminal Codes:
  • R = running
  • S = start
  • C = general

The following wire colors are usually connected to the terminals, sources, or controls listed below. Your device’s wiring diagram will display data like this (colors may vary).

Color Codes and Connections For HVAC wiring – The Basics

  • Wire Color: black
    Typical Connection Compressor/Condenser Unit: power supply. It has terminal C connected to it. Or the common terminal of the capacitor.
    Compressor contactor T1-C relays at compressor motor terminals
    Also black from the wires from the compressor connector T1 to start relay T5.
    &
    Also black wires from the compressor connector T1 to the external fan motor power terminals.
    Typical Connection Blower/Fan Assembly: Air Handling Unit Blower Motor Fan To Contactor Relay Station T1. Starting the fan motor from the fan relay
  • Wire Color Red Power

    Typical Connection Compressor/Condenser Unit: power supply. It has R connected to it. Or Run terminal of the capacitor. The compressor contactor T2-R is relayed at the compressor motor terminals
    Typical Connection Blower/Fan Assembly: The power from the fan relay to the fan motor is usually connected to the T2 terminal of the conductor relay.
    For multi-speed fans red = low speed motor terminals

  • Wire Color: Blue

    Typical Connection Compressor/Condenser Unit: Two blue low voltage wires to power the conductor relay magnet
    More often: compressor R or station run to compressor start capacitor S
    & Compressor R or station-to-compressor running capacitor R
    Typical Connection Blower/Fan Assembly: Power supply for medium speed motor stations

  • Wire Color: Brown

    Typical Connection Compressor/Condenser Unit: Fan Motor – Condenser (Engine Starting Terminal)
    Connect the fan to the F or FAN terminal of the capacitor and connect it to the fan motor.
    Typical Connection Compressor/Condenser Unit: From the fan motor to the condenser (from the motor starting terminal)
    Connect the fan motor to the F or FAN terminal of the fan motor capacitor.

  • Wire Color: Brown + White

    Typical Connection Compressor/Condenser Unit: The same use of the white wire, capacitor C of conductor T2
    DO NOT USE WHEN USING THE OPERATING / DUAL OPERATION CASE
    Typical Connection Compressor/Condenser Unit: The same use of the white wire, capacitor C (common) for conductor T2
    DO NOT USE WHEN USING THE OPERATING / DUAL OPERATION CASE

  • Wire Color: Green Color

    Typical Connection Compressor/Condenser Unit: Ground wire for almost all systems

  • Wire Color: Orange

    Typical Connection Compressor/Condenser Unit: From the power terminal of the fan motor to the C or COM of the capacitor Typical Compressor connector relay T2 to C, COM, or RC connector on the running capacitor or on/on capacitor. External fan motor to C, COM or RC connector when capacitor is running or starting/running                                                                                      Connection Compressor/Condenser Unit:  For multi-speed fans, orange is medium and low speed

  • Wire Color: Purple

Typical Connection Compressor/Condenser Unit: Compressor terminal S to HERM or H when motor run capacitors or start/running capacitor. It may be ground or neutral.                                                                                                    Connection Compressor/Condenser Unit: When grounding, the direction of the fan motor changes from counterclockwise to counterclockwise. For the opposite, connect purple with yellow. Connect it from the fan to the COM terminal of the capacitor.

  • Wire Color: Red

Typical Connection Compressor/Condenser Unit: Compressor T2 connector relays to compressor R. Start the relay from T1 to C with another starting capacitor & If separate start and run caps are used, Separate starting capacitor C to C for starting capacitor

  • Wire Color: Yellow

Typical Connection Compressor/Condenser Unit: Compress H or HERM from the condenser. Frequently: the compressor starts relaying to C of the motor start capacitors                                                                                                Connection Compressor/Condenser Unit: Medium speed motor control of fan motor

  • Wire Color: White

Typical Connection Compressor/Condenser Unit: The common wire connects to the ground (neutral) side of the power supply                                    Connection Compressor/Condenser Unit: The common wire connects to the ground (neutral) side of the power supply

Additional info regarding the above table:

But keep in mind that the colors and uses of the motor and its wires may actually be different. It is always best to determine the make and model of your electric motor and find the wiring diagram for it.
Take a closer look at the engine itself. A label or data plate has Wiring often marked on .
Change the engine speed by switching wire connectors
Electric motor speed faucet: L2 is usually connected to

  • L-2 to black = fast
  • Blue from L-2 = Medium speed
  • L-2 to red = slow

Change the direction of rotation of the motor by replacing the wire connector

  • Magenta to Magenta = Rotate clockwise
  • Magenta to Yellow = Rotate counterclockwise

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