Description
Astralpool 16 µf 1 hp motor capacitor 4405020122
The Astralpool 16 µf 1 hp motor capacitor 4405020122 is an original replacement run and start capacitor for selected single phase
Astralpool pool pump motors around 1 hp. It restores the correct phase shift between motor windings, allowing the pump to start
smoothly and run with stable torque during daily filtration cycles.
Function of the 16 µf motor capacitor
In a single phase pool pump motor, the capacitor creates a phase shift between the main and auxiliary windings. This provides the
starting torque needed to overcome static friction and to bring the pump up to speed, then helps maintain efficient operation once the
motor is running. With the Astralpool 16 µf 1 hp motor capacitor 4405020122 correctly installed, compatible pumps start more reliably,
even under normal system back pressure.
A healthy capacitor also supports lower running current and reduced motor temperature, which contributes to longer service life for the
entire pump assembly.
Design and technical characteristics
The Astralpool 16 µf 1 hp motor capacitor 4405020122 is a sealed, maintenance free component designed for continuous duty in demanding
filtration environments. The capacitance value of 16 microfarads is matched to the electrical design of the corresponding 1 hp motor so
that starting and running characteristics remain within the values defined by the manufacturer.
- Capacitance value of 16 µf for selected 1 hp single phase motors.
- Closed, insulated housing for safe mounting in humid technical rooms.
- Designed for continuous use at standard mains frequency (50 hz).
- Terminals configured to connect to the existing motor wiring harness.
Compatibility and typical applications
This motor capacitor is intended for Astralpool pool pumps whose technical documentation specifies a 16 µf capacitor with reference
4405020122. It is mainly used on residential circulation pumps in the 1 hp range that operate many hours per day to drive water through
sand, glass or cartridge filters.
- Suitable for selected Astralpool single phase motors rated around 1 hp.
- Designed for use in private pool filtration systems.
- Direct replacement when the original 16 µf capacitor shows signs of fatigue.
Before ordering, always verify the capacitor value on the existing component label and check the parts list for your pump model to
confirm that 4405020122 is the correct reference.
When to replace the capacitor 4405020122
Motor capacitors are wear components. Heat, age and repeated start cycles gradually degrade the dielectric material inside, reducing
capacitance and affecting motor behaviour. Early replacement helps avoid complete pump stoppages at the height of the swimming season.
- Motor hums but does not start, or only starts if the pump shaft is turned manually.
- Sluggish start up, with the motor taking longer than usual to reach full speed.
- Frequent tripping of thermal protection or higher than normal motor temperature.
- Visible swelling, cracks or leakage on the capacitor housing.
If one or more of these symptoms appear and other mechanical causes have been ruled out, fitting a new Astralpool 16 µf 1 hp motor
capacitor 4405020122 is often the most straightforward solution.
Installation and safety advice
Even though it is a small component, any work on the motor capacitor must be carried out with strict respect for electrical safety.
The pump must be disconnected from the mains and all local regulations must be followed. If in doubt, installation should be done by a
qualified technician.
- Disconnect the power supply and verify the absence of voltage before opening the motor terminal box.
- Note or photograph the original wiring layout so you can reproduce it exactly.
- Carefully disconnect the old capacitor and remove its fixing clamp or support.
- Install the new 16 µf capacitor in the same position, securing it firmly so it cannot vibrate.
- Reconnect the wires to the same terminals, checking that all connections are tight and properly insulated.
- Close the terminal box, restore power and test the pump start up under supervision.
After replacement, the motor should start promptly and run with a stable sound. If abnormal noise, overheating or tripping persists, a
broader diagnostic of the pump and electrical supply is recommended.
Good practice for long capacitor life
With the Astralpool 16 µf 1 hp motor capacitor 4405020122 installed, a few simple habits help extend its operating life and protect the
motor.
- Ensure adequate ventilation around the motor to limit operating temperature.
- Avoid excessive start stop cycles; use timers with reasonable filtration schedules.
- Keep the terminal box closed and dry to protect electrical connections.
- Check starting behaviour at the beginning of each season and consider preventive replacement on older pumps.
Using the original Astralpool 16 µf 1 hp motor capacitor 4405020122 helps keep compatible pool pumps starting reliably and running
smoothly throughout the swimming season.
