1. Introduktion
This manual provides essential information for the safe and effective installation, operation, and maintenance of the MARS 12905 370V Oval 5 Micro-Farads Motor Run Capacitor. This capacitor is designed for use in air conditioning and heat pump systems to assist in starting and running electric motors.
2. Vigtige sikkerhedsoplysninger
WARNING: Electrical Shock Hazard. Risk of serious injury or death.
- Installation and servicing of this product should only be performed by qualified and licensed HVAC technicians.
- Always disconnect all power to the unit before installing, servicing, or removing the capacitor.
- Capacitors can store a dangerous electrical charge even after power is disconnected. Always discharge the capacitor using a properly insulated screwdriver or resistor before handling. Touch the metal shaft of the screwdriver across the capacitor terminals to discharge.
- Brug passende personlige værnemidler, herunder isolerende handsker og sikkerhedsbriller.
- Ensure all wiring connections are secure and correct according to the equipment manufacturer's specifications.
- Overskrid ikke den nominelle voltage or capacitance of the replacement capacitor.
3. Produktfunktioner
- 5 Micro-Farads (µF) capacitance.
- 370 Volts (V) operating voltage.
- Oval shape for versatile mounting.
- Konstrueret af slidstærkt metal.
- Designed for air conditioning or heat pump duty.
4. Specifikationer
| Specifikation | Værdi |
|---|---|
| Mærke | MARS |
| Modelnummer | 12905 |
| Kapacitans | 5 Microfarad (µF) |
| Operation Voltage | 370 volt (V) |
| Form | Oval |
| Materiale | Metal |
| Øverste temperaturvurdering | 105 grader Celsius |
| Varens vægt | 2.4 ounce |
5. Installationsvejledning
This section outlines the general steps for replacing a motor run capacitor. Always refer to the specific equipment manufacturer's service manual for detailed instructions and safety precautions.
- Afbryd strømmen: Turn off all electrical power to the HVAC unit at the circuit breaker or disconnect switch. Verify power is off using a voltage tester.
- Locate Capacitor: Open the access panel of the outdoor or indoor unit to locate the existing capacitor.
- Aflad gammel kondensator: Using an insulated screwdriver, carefully short the terminals of the old capacitor to discharge any stored electrical energy. You may hear a pop or see a small spark.
- Bemærk ledningsføring: Take a clear photograph or draw a diagram of the existing wiring connections to the capacitor terminals. Note which wires connect to which terminals.
- Fjern den gamle kondensator: Frakobl ledningerne fra den gamle kondensator, og fjern den fra monteringsbeslaget.
- Installer ny kondensator: Place the new MARS 12905 capacitor into the mounting bracket.
- Tilslut ledninger: Connect the wires to the new capacitor terminals exactly as they were connected to the old capacitor. Ensure connections are tight and secure.

Figur 1: Øverst view of the MARS 12905 capacitor, illustrating the two terminal connections for wiring.

Figur 2: Side og top view of the MARS 12905 capacitor, showing its physical dimensions: approximately 1.5 inches in height, 2.06 inches in length, and 1.21 inches in width.
- Sikker adgangspanel: Luk og fastgør adgangspanelet.
- Gendan strøm: Gendan den elektriske strøm til enheden.
- Test drift: Test HVAC-enheden for at sikre korrekt drift.
6. Betjening
The MARS 12905 motor run capacitor is a passive electrical component that stores electrical energy. In HVAC systems, it provides a phase shift to the motor windings, creating a rotating magnetic field necessary for the motor to start and run efficiently. It continuously operates while the motor is running, helping to maintain consistent motor speed and reduce energy consumption.
7. Vedligeholdelse
Capacitors generally do not require routine maintenance. However, periodic visual inspection during HVAC system servicing is recommended:
- Check for signs of swelling, bulging, or leakage, which indicate failure.
- Ensure terminal connections are clean and free of corrosion.
- Verify the capacitor is securely mounted.
If any issues are observed, follow the safety procedures in Section 2 and consult a qualified technician for replacement.
8. Fejlfinding
A failing motor run capacitor can exhibit several symptoms:
- Motor brummer, men starter ikke: The motor may make a humming sound but fail to rotate, often requiring a manual push to start.
- Motor Starts Slowly: The motor takes longer than usual to reach full operating speed.
- Reduceret ydeevne: The motor runs at a lower speed or with less power than normal.
- Overophedning: The motor may overheat due to increased current draw.
- Synlig skade: The capacitor itself may appear swollen, bulging, or leaking.
If these symptoms occur, it is likely that the capacitor needs to be replaced. Always follow safety guidelines and consult a professional for diagnosis and replacement.
9. Garanti og support
For warranty information, please refer to the documentation provided with your purchase or contact the seller or MARS - Motors & Armatures, Inc. directly. Support for this product can be obtained through the original point of purchase or by contacting the manufacturer.
Manufacturer: MARS - Motors & Armatures, Inc.