🔧 Nibe 518251 Low Pressure Stat (C.O 0.3 bar / C.I 1.0 bar)

The Nibe 518251 Low Pressure Switch is a vital safety component used to monitor the refrigerant pressure on the low side of Nibe air source heat pump systems. It helps protect the compressor from running under low-pressure conditions.

🧾 Technical Specifications:

• Nibe Part Number: 518251

• Component Type: Low Pressure Safety Switch

• Cut-Out Pressure (C.O): 0.3 bar

• Cut-In Pressure (C.I): 1.0 bar

• Function: Disconnects compressor when pressure falls below safe operating limits

• Reactivation: Automatically resets when pressure recovers

• Mounting: Brazed 

✅ Compatible With:

Nibe F2015 Air Source Heat Pump Models:

• F2015 6kW

• F2015 8kW

• F2015 11kW

Nibe F2025 Air Source Heat Pump Models:

• F2025 6kW

• F2025 8kW

• F2025 10kW

• F2025 14kW

🛠️ Applications & Benefits:

• Protects the system from running dry or under low refrigerant charge

• Often used in fault diagnosis when LP alarms or compressor lockouts occur

• Ideal for post-repair replacements after refrigerant leak repairs or component failure

• Ensures long-term compressor protection and system reliability

⚠️ Engineer’s Note:

Before replacing the LP stat, verify refrigerant levels and inspect for leaks. A persistently low pressure reading could indicate undercharge or a restriction in the evaporator circuit., brine levels, airflow, fan issues or brine pump issue.