Siemens Building Technology 188-0033 Thermostat 320074-702 these part numbers are identical

these part numbers are identical in technical specification and fitment

Extended Capillary Reach: The 30-inch lead provides flexibility for various sensing bulb placements on the suction line

If the stem moves freely but the flow is blocked

the ML9666 is a standard-setting component for radiators

indicating the SPDT contacts have switched state

Siemens Building Technology 188-0033 Thermostat 320074-702 these part numbers are identicalThe Siemens Building Technology 188 0033 is a specialized unit mounted hot water replacement thermostat engineered for high demand commercial heating applications. Designed specifically for hydronic HVAC heating control, this analog controller provides precise temperature regulation for terminal units including fan coils and unit heaters. As a critical HVAC replacement part, it enables contractors to restore legacy system performance without the