Siemens Building Technology 188-0030 Thermostat Refrigerant the D25403 is the designated

the D25403 is the designated K-2110 pilot valve kit for all standard GP-2000 pressure reducing valves

inconsistent actuator movement

Always verify the part number against your unit's wiring diagram or the OEM parts list

It serves as a crankcase heater

or a burnt smell emanating from the coil

Siemens Building Technology 188-0030 Thermostat Refrigerant the D25403 is the designatedThe Siemens 188 0030 is a heavy duty unit mounted pneumatic thermostat designed specifically for high low temperature control in HVAC terminal units like fan coils and induction units. This TH 188 HC model features a direct acting (DA) heating and reverse acting (RA) cooling sequence, making it a critical component for two pipe changeover systems. Engineered with a bimaterial sensing element, it provides reliable proportional control and pneumatic