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Direct Replacement: Verified as identical to Danfoss 068U220600
the 5D51-78 includes a removable solid copper jumper between the fan and limit circuits
or exhaust circuits based on system demand
The 100412 is the approved replacement for the 054981
Johnson Controls S-2300-4 Selector Switch Els PW 17895 Direct Replacement: Verified as identicalAs a veteran HVAC technician, I know that manual pneumatic control remains the backbone of many legacy system architectures. The Johnson Controls S 2300 4 Selector Switch is a high performance pneumatic air switch designed specifically for the manual redirection of air flow within these complex pneumatic control systems. This five port configuration features three exhausting ports and one pair of switching ports, making it the ideal solution for