McDonnell & Miller 221 Water Feeder 326058 757 Consult the service panel legend Consult the service panel legend or the technical manual to decode these pulses for precise diagnostic identification of system failures The White Rodgers 90 T40F3 is a 40VA Class 2 transformer engineered for reliable step down power conversion in demanding industrial and HVACR environments The McDonnell & Miller 221 Water Feeder (Part Number 126600) is a heavy duty mechanical make up water feeder specifically engineered for boiler receiver tanks in commercial and industrial hydronic systems Exceeding this pressure can impact the float buoyancy and valve performance