a faulty HH79NZ103 thermistor is often the culprit

For contractors replacing older VG7000 series valves

utilizing an 06 orifice size for consistent flow regulation

chiller protection

Using a genuine Source 1 S1-7995-3281/A maintains the integrity of the safety loop

Siemens Building Technology 599-03023 Valve 321142-301 a faulty HH79NZ103 thermistor isThe Siemens 599 03023 is an industrial grade 1 inch NPT globe valve designed for demanding HVACR applications requiring precise modulation. Part of the legendary Flowrite 599 series, this 2 way normally closed valve body is engineered with a bronze body (UNS CA 844) and rugged stainless steel trim to handle saturated steam (up to 15 psi), hot water, or chilled water with up to 50% glycol. With a 10 Cv flow coefficient and a linear flow characteristic,