Peco Controls SP155-009 Thermostat

The Peco Controls SP155-009 is a high-performance Dual SetPoint Commercial Thermostat engineered for precision control in professional HVACR applications. This analog commercial thermostat is a standard-setting solution for 2-pipe or 4-pipe fan coil systems, offering reliable SPDT (Single Pole Double Throw) switching capability. Designed to withstand the rigors of commercial environments, the SP155-009 provides independent heating and cooling setpoints, making it an essential component for commercial HVAC zoning and precise terminal unit management. Its robust construction ensures long-term calibration stability, minimizing drift in high-traffic installations. Whether you are performing a field replacement or a new system integration, this low voltage thermostat delivers the consistent thermal regulation required for office buildings, hospitality suites, and multi-family housing units. The intuitive interface reduces tenant callbacks while the heavy-duty internal components handle the cycling demands of industrial-grade actuators and valves without degradation.

Technical Application Benefits:

• Dual Setpoint Control: Features separate sliders for heating and cooling to prevent system short-cycling and overlapping.
• Universal Compatibility: Optimized for 2-pipe and 4-pipe fan coil units and compatible with most 24VAC control circuits.
• Field Reliability: Built with high-grade electrical contacts to ensure positive switching for fan coil unit (FCU) control.
• Simplified Installation: Compact footprint allows for easy mounting on standard vertical or horizontal junction boxes with straightforward terminal wiring.

Common Technical Questions:

How do I wire this for a 2-pipe system vs a 4-pipe system?
The SP155-009 utilizes standard terminal designations for common, heat, and cool; for 2-pipe systems with seasonal changeover, ensure your aquastat or changeover switch is wired in series with the main control loop.

What is the typical differential for this analog unit?
This thermostat maintains a fixed mechanical differential of approximately 2°F to balance occupant comfort with equipment protection.

Can this unit control 120V or 240V equipment directly?
No, this model is designed specifically for 24VAC-30VAC pilot duty applications. For line voltage requirements, use an appropriately rated isolation relay.

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.