What is the difference between the V4055A1296 and the V4055A1098

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reducing the risk of HVAC valve sticking or hysteresis caused by sediment

Can this be used for differential enthalpy control

High-Temperature Seal: Includes specialized gaskets to maintain a gas-tight combustion seal under extreme thermal loads

Fenwal 12-E27121-020-04 Mounting Head Refrigerant What is the difference betweenThe Fenwal 12 E27121 020 04 Mounting Head is a high precision Detect A Fire thermal detector engineered for fire suppression release and overheat alarm signaling. Designed with rate compensation technology, this unit accurately monitors ambient temperature without the lag inherent in standard fixed temperature sensors or the false positive risks of rate of rise detectors. This vertical mount model features a 300 series stainless steel shell and hex