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Check the boiler nameplate for the BTU or PPH rating to ensure this valve meets the safety overhead required by local jurisdiction
a TEFC (Totally Enclosed Fan Coled) motor is typically recommended
This typically limits 18 AWG wire runs to 250 feet and 24 AWG runs to 50 feet
007" Restrictor
the head plate
Siemens Building Technology 257-02055 Valve Assembly R-407C Check the boiler nameplate forThe Siemens 257 02055 Valve Assembly is a high performance 2 way normally open valve designed for precision control of hot or chilled water and low pressure steam in terminal units. Built on the rugged Powermite 599 MT Series platform, this assembly features a 1 2 inch NPT connection and a 2. 5 Cv flow coefficient. The forged brass body is paired with stainless steel trim to ensure long term durability and resistance to scaling in demanding hydronic
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