The Johnson Controls P400BD-1 Pressure Switch provides critical single point differential oil pressure monitoring for commercial refrigeration and HVAC compressors

allowing for easier maintenance and long-range sensor wiring up to 300 feet

The ZoneFirst SPRD-10 is a heavy-duty 10-inch round barometric static pressure regulating damper engineered for bypass air management in multizone HVAC systems

it facilitates precise energy efficiency by modulating between heating stages based on thermostat demand

it requires immediate replacement

Resideo TH8321R1001 Thermostat 319825-402 The Johnson Controls P400BD-1 PressureThe Resideo TH8321R1001 VisionPRO 8000 is a versatile 7 day programmable thermostat engineered with RedLINK technology for robust wireless communication. Designed for flexibility, this unit operates as a standalone controller for up to 3H 2C heat pump or 2H 2C conventional systems. When integrated with an Equipment Interface Module (EIM), its capacity expands to 4H 2C heat pump or 3H 2C conventional configurations. It supports 18 30Vac or 750mV