Under the unit pump

The  slim design of the SI-20 allows it to easily fit inside a mini-split air conditioner, but also alongside the unit (in lineset cover).

The Sauermann piston technology inside the Si-20 is specifically constructed for removing condensates from air conditioning systems. This technology makes the Si-20 fully reliable in any kind of environment.

The operating sound level of the Si-20 will remain low (22 dBA) whatever the amount of condensate. The Si-20 pump is fitted with unique rubber dampers designed to reduce noise caused by vibration.

The Si-20 is also fitted with a pre-installed Drain Safe Device, for a unique reliability in any kind of installation.

Modern design
Easy installation
Low sound levels
Easy maintenance
Proven reliability

Technical details

Max flow rate20 l/h
Max discharge head10 m
Max pressure14 m
Insulation classDouble insulation
Mains supply230V~ 50/60Hz - 14 W
Operation conditions100%
Weight0,73 kg
ColorRAL 9010
Master pack quantity6
Safety switch 
NC 8A resistive – 250V
Detection unit
Thermal protection 
115°C (auto-reset)

Pump dimensions

Pump136 mm38 mm38 mm
Detection unit55 mm38 mm38 mm
Packaging170 mm170 mm72 mm

Detection levels

ON16 mm
OFF11 mm

Pump sound levels

at 3,3ft or 1m according to EN ISO3744 (dBA)<= 25
Kit contents 
Si-20 piston pump with
Detection unit, 0.63 m cable
2 anti-vibration rubber dampers
Clear PVC tube  int. 6 mm – L: 60 mm, fitted with a « Drain Safe Device » pre-mounted
1.5 m power cable: 2 power wires, 2 safety contact wires.
2-part shell (back plate and cover).
Detection unit installation kit: rubber elbow 90° Ø int. 15 x L 152 mm, vent tube Ø int. Ø int. 4 x L 75 mm, 3 double wire clamp
3 screws and plugs for fixing back plate
Safety standards 
RoHS and WEEE directives 
Technical data sheet (PDF) 
Wiring diagram