Johnson Controls P170LB-6 Pressure Control

The Johnson Controls P170LB-6 is a professional-grade dual pressure control designed for heavy-duty refrigeration and air conditioning applications. This SPST switch action controller provides integrated high and low pressure protection within a single housing. The low-pressure side features an adjustable range of 12" Hg to 80 psi with a field-settable differential of 5 to 35 psi, allowing for precise cycling control. On the high-side, the control handles 100 to 500 psi with a 65 psi non-adjustable differential, ensuring critical system safety against over-pressurization. Engineered with a 1/4" external flare connector, the P170LB-6 simplifies installation on standard liquid and suction lines. The inclusion of a low cut out limited knob adjustment prevents accidental setpoint drift, maintaining strictly calibrated operational parameters. This refrigeration pressure switch is built for longevity in demanding environments, offering reliable HVAC compressor protection and accurate pressure-actuated switching for commercial systems.

• Dual-Function Monitoring: Combines high-pressure cutout and low-pressure cycling in one compact NEMA 1 enclosure.
• Limited Adjustment Knob: Prevents unauthorized or accidental changes to the low-side cutout settings.
• High-Pressure Safety: Built-in 500 psi limit protects the compressor and system components from catastrophic failure.
• Standard Fitting: Features a 1/4" SAE male flare connection for universal compatibility with most manifold and gauge sets.
• Robust Switch Mechanism: Heavy-duty SPST contacts are designed to handle high-inductive loads common in refrigeration motors.

What is the difference between the P170LB-6 and other dual controls?
The P170LB-6 is specifically configured with a limited adjustment knob for the low-side cutout and features an automatic reset mechanism rather than a manual reset found on safety-only models.

Can this control be used with R-410A systems?
Yes, the 500 psi high-side range is compatible with high-pressure refrigerants like R-410A, provided the system operating pressures fall within the 100 to 500 psi window.

How do I set the differential on the low side?
The low-side differential is adjustable between 5 and 35 psi using the internal scale, allowing technicians to fine-tune the cut-in and cut-out points to prevent short-cycling.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.