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Key Benefits Efficient Load Staging: Features a 30-90 second delay-on and 1-30 second delay-off to prevent simultaneous element activation
It is intended for field service where the existing switch is operational or where a specific custom switch is being installed separately
it is not intended for steam applications
installation involves handling pressurized refrigerant and requires a recovery machine
Seamless Integration: Uses RS485 Modbus protocol for easy daisy-chaining into existing building management systems (BMS) or site controllers
Siemens Building Technology QFM81.21 Hygrostat 323055-751 Key Benefits Efficient Load Staging:The Siemens Building Technology QFM81. 21 is a commercial grade duct hygrostat designed for precision relative humidity control in HVAC systems. Engineered for both monitoring and regulation, this device features a stabilized sensing strip that ensures superior linearity and long term stability, even in high humidity environments or air contaminated with dust. Unlike baseline models, the QFM81. 21 utilizes an internal setpoint adjuster to prevent
