Peco Controls SP155-009 Thermostat R-407A If your specific model requires

If your specific model requires a resistor on the third lead (like the 101334-02)

making it the standard choice for maintaining Carrier HVAC equipment performance

The Armstrong 800-3/4-80 is specifically rated for a maximum differential pressure of 80 psi

improper bolt torque

Heat pump reversing valve troubleshooting often points to coil failure or internal slide-valve sticking

Peco Controls SP155-009 Thermostat R-407A If your specific model requiresThe 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