Sterling Steam Condensate Pump, No. 42210G, 1/2 HP, 1 Phase
Sterling 4200 series condensate pump. Single 1-1/2″ discharge, 1/2 hp 1 phase, 3450 rpm pump & motor, rated to 10,000 EDR, at 20 psi. 15 gpm. This unit has a 13-1/2 gallon cast iron receiver with 2″ inlet. Sterling condensate pump units are designed to collect return condensate from the steam system and return it to the boiler in most cases via a boiler feed pump unit. As condensate flows by gravity or from other pumping units to this receiver tank, the receiver fills with water. The float switch assembly then rises and signals the motor on the pump to start and begin pumping the condensate until the float drops with the lower water level and breaks the contact on the switch to shut the pump off. Sterling condensate pumps are made in simplex (one pump) or duplex (two pumps). Duplex units are supplied with a mechanical alternator in place of the simplex float switch. The mechanical alternator will alternate from one pump to the other pump during cycles. This means longer life to the unit, plus it provides automatic back-up for the first pump in case of failure or it cannot handle the return load. Sterling 4100 series receivers are steel, 4200 series are cast iron. The pumps are bronze fitted and run at 3450 RPMS.
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