Taco® 0012-VSSF4, Variable Speed Setpoint Cartridge Circulator Pump, Stainless Steel, Series: 00, Model: 0012, 52 gpm Flow Rate, 14-1/2 ft Maximum Head, 1/8 hp Power, 115 V, 1.33 Amps, 60 Hz Frequency, 1 ph, 150 psi Maximum, 3250 rpm Motor, Non-Metallic Impeller, Standard 2-Bolt Flange Mounting, 40 to 230 deg F, Carbon Bearing, 8-1/2 in H x 5-1/2 in W x 8-5/8 in D Dimensions, Domestic

The versatile Setpoint version of the Variable Speed “00” can be set up to deliver a fixed temperature, maintain a specific temperature drop between sensor locations (∆T), used as a bypass / shunt pump or integrated into a fan coil package to vary the speed of the pump based on supply air temperature. The 00-VS can be either direct acting (speed increases on a temperature decrease) or reverse acting (speed increases on a temperature increase). A typical direct acting (limiting setpoint) application would be for boiler protection, where the 00-VS is installed on a bypass loop (see figure B). If the return temperature starts to drop below the set temperature (75°- 165°F) then the speed of the pump will be increased, bypassing hot water to protect the boiler.

The 00-VS can be used in radiant injection mixing systems where you want to set a fixed supply water temperature (see figure C). Through the use of the setpoint dial on the PC board any temperature from 30°-210°F can be selected. If desired, a boiler protection sensor can be installed to protect the boiler from flue gas condensation. In the ∆T mode the pump speed is varied to maintain a set temperature drop (5°-50°F) across a boiler or heat exchanger, ideal for snowmelt applications.