Sauermann Si-50 Peristaltic Condensate Pump – 6 L/h, 12 m Head

Sauermann Si-50 Peristaltic Condensate Pump | SI50CE01UN23

The Sauermann Si-50 is a peristaltic condensate pump designed for all types of air conditioning units up to 8 kW: wall units, air conditioning cabinets, ceiling units, and ducted units. Controlled by the air conditioner compressor power signal (cooling signal), it activates when the compressor runs and continues operating for 4 minutes after the compressor stops to clear residual condensate.

⚠️ Important: The Si-50 is not compatible with reversible or inverter systems as it must not be used in continuous operation. For inverter or reversible systems, see the Sauermann Si-52.

Key Features

• Peristaltic pump — quiet, vibration-free, self-priming operation
• Compressor live signal detection — wired directly to compressor line
• Runs 4 minutes after compressor stops — clears residual condensate
• 12 m maximum discharge head | 2 m maximum suction head
• 6 L/h constant flow rate (regardless of discharge or suction head)
• IP55 protection — suitable for unventilated areas
• ≤30 dBA — quiet, vibration-free operation
• Thick, reinforced tube for longer service life
• Resistance to contaminated condensate (particles and chemicals)
• Easy-open front panel — tool-free tube replacement
• Glass fuse replaceable in one step (standard 5×20 cartridge)
• Compact: L85 × W108 × H122 mm
• CE & UKCA certified | RoHS & WEEE compliant | Made in France

Technical Specifications

Kit Contents

• Peristaltic pump Si-50
• Cable 1.7 m including 2 wires for power supply (P & N) + compressor line wire
• Easy 2-screw sliding plastic bracket
• Ø15 mm to Ø6 mm adaptor + sleeve (ACC00927)

Applications

• Wall-mounted split AC units up to 8 kW
• Air conditioning cabinets
• Ceiling suspended units
• Computer room air conditioning
• Ducted systems
• Ideal for dusty or chemical environments (bakeries, hairdressers, hotels)
• Hotels — maintenance possible without accessing rooms

Si-50 vs Si-51 vs Si-52 — Which Do I Need?

PE-Series Spare-Part Compatibility

Use the spare parts specified for the pump family: PE5001 and PE5002 are specified for the PE-5000 / PE-5100 / PE-5200 range, while ACC00954 and ACC00953 are specified for the Si-50 / Si-51 / Si-52 range.

Compatible Accessories

• ACC00954 — Replacement head for Si-50, Si-51, Si-52
• ACC00953 — Replacement hose for Si-50, Si-51, Si-52
• ACC00927 — Multi-diameter reducing adaptor (Ø15 mm to Ø6 mm)
• ACC20005 — 6× self-sealing fittings for Ø6 mm (1/4") hose
• ACC00909 — Clear PVC hose Ø6 mm (5m)
• ACC00910 — Clear PVC hose Ø6 mm (50m)
• Browse all Condensate Pump Accessories

Also in the Sauermann Peristaltic Range

• Sauermann Si-51 — thermal probe detection, not for inverter/reversible
• Sauermann Si-52 — float switch detection, compatible with inverter/reversible

Frequently Asked Questions

How does the Si-50 know when to run?

The Si-50 is wired directly to the air conditioner compressor line. It activates when the compressor runs and continues for 4 minutes after the compressor stops to clear any remaining condensate.

Can the Si-50 be used with inverter or reversible AC systems?

No. The Si-50 must not be used in continuous operation and is incompatible with reversible and inverter systems. For these systems, use the Sauermann Si-52 instead.

What is the difference between the Si-50, Si-51, and Si-52?

The Si-50 uses compressor live signal detection. The Si-51 uses thermal probes (temperature differential). The Si-52 uses a float switch and is the only model compatible with inverter and reversible systems.

Can I use PE5000 spare parts (PE5001 head, PE5002 tube) on the Si-50?

No. PE series spare parts are not compatible with the Si-50/51/52. Use ACC00954 (replacement head) and ACC00953 (replacement hose) for SI series servicing.

Does the Si-50 work on UK 230 V supply?

Yes. The Si-50 runs on 230 V~ 50/60 Hz standard UK mains supply.

Browse our full range of peristaltic condensate pumps and Sauermann products.