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- The Foam Compensating Low Water Cutoffs, (LF series), are advanced, microprocessor based low water cutoffs for detecting the presence of a conductive fluid in a vessel or tank. The LF series is primarily designed for use in low-pressure steam and hot water boilers to cutoff the burner in low water level conditions. They may be used as either the primary or secondary cutoff on low-pressure steam boilers or as the primary low water cutoff on hot water boilers. Additionally, they can protect pumps from running dry in condensate receiver tank applications or activate alarm systems or automatic water feeders. (See each boiler manufacturers' specifications for recommended minimum safe water levels.) The LF series uses its DualVision™ technology to identify when its probe is in foam and the boiler water is at an unsafe level. The LF series cannot be fooled by the presence of conductive foam on its probe, and it does not require periodic shutdowns of the boiler to determine actual water levels in foaming boilers. The DualVision™ technology also allows the LF series to identify reduced probe signal levels due to fouling and turns on an LED light when the probe should be inspected and cleaned. The LFA models automatically reset when water levels return to safe levels. The LFA control may be used with an alarm or with an automatic water feeder (EWF) to keep the boiler filled to the proper level. The LFM models are manual reset models. Once a low water level has returned to proper levels, the reset switch on the LFM must be pressed to restore the system to normal operation. During a low water condition, the "STATUS" LED will illuminate RED. In normal conditions, it will illuminate GREEN. If the LFA detects foaming, the "SERVICE" LED will blink AMBER. If the LFA detects a low signal level from the probe, the "SERVICE" LED will illuminate AMBER to signal that probe cleaning may be required. (See Fig. 3 for LED operation details). The LF series will not lock out upon power loss provided water remains covering the probe. They fully comply with CSD-1 requirements.
Taco® DualVision™ Low Water Cut Off, Series: LF, 120 V, 150 deg F, 250 psi, Manual Reset, NPT Connection, 3/4 in, 3 VA
- The DualVision™ technology provides continuous protection against false water level detection due to probe being in foam
- Automatic detection of foaming conditions and shutdown of boiler when water level becomes unsafe
- Eliminates intermittent shutdown of the boiler
- 125 VA pilot rating
- Delays: Delay on Make (DOM), and Delay on Break (DOB), automatically provided based upon boiler conditions
- 250 deg F max probe temperature
- 150 deg F maximum ambient temperature
- Probe sensitivity - extended operation to 20 kOhm, service range 20 to 40 kOhm
- Enclosures - control unit NEMA Type 1 (For indoor use only)
- Formed sheet metal with powder coat/plated finish
- Five openings for 1/2 in conduit fittings
- 7.5 A full load
- 43.2 A locked rotor
- Connection TypeNPTPressure Rating250 psiReset TypeManualTemperature Rating150 degFVoltage Rating120 VACManufacturerTACOManufacturer #LFM1203S-1Power Rating3 VASeriesLF SeriesThread Size3/4 in