Protection Relays Pump Controls and Liquid Level Controls LLC8 SERIES Low Level Cutoff Liquid Level Controls Description The LLC8 Series is a low cost, single-probe conductive liquid level control designed for low liquid level cutoff protection. It offers a factory fixed time delay of 1 - 60s and is available for input voltages of 24, 120, or 230VAC. LED indicator illuminates whenever the LLC8’s isolated, 10A, SPDT output relay is energized. Sense resistance is fixed from 5K - 250KΩ. Available with manual/automatic reset or a special manual reset with a power outage feature that auto resets the unit when power is restored and the water level is acceptable. 24 and 120VAC units are UL recognized as limit switches under UL353 (230VAC units are UL 508) and CSA certified under Standard 14. Wiring Diagram Metal Tank or use additional Probe V = Voltage LLCO = Low Level Probe G, CP = Ground or Common (Reference) Probe R = Optional NC Reset Switch (not included) NO = Normally Open NC = Normally Closed C = Common or Transfer Contact Relay contacts are isolated. Connect common to conductive tank. Additional probe is necessary for non-conductive or insulated tanks. TIME DELAY (FIXED) SENSE RESISTANCE LLC825F5M 24VAC LLC842F103M 120VAC LLC843F10M 120VAC 5s 2s 3s 5kΩ 10kΩ 10kΩ LLC843F10P 120VAC 3s 10kΩ LLC843F26M 120VAC 3s 26kΩ LLC843F26P 120VAC 3s 26kΩ LLC845F25P 120VAC 5s 25kΩ LLC8430F250P 120VAC 30s 250kΩ LLC8430F26P 120VAC 30s 26kΩ LLC8610F12M 230VAC 10s 12kΩ LLC863F26P 3s 26kΩ INPUT VOLTAGE 230VAC Manual Reset (Reset switch connected): When the liquid level falls below low level probe, the output relay and LED de-energize after a fixed time delay. When the liquid level rises to low level probe, the output relay and LED indicator remain de-energized until the NC manual reset switch is opened; then they energize immediately. Power Outage Manual Reset (Reset switch connected): A power outage causes the output relay and LED indicator to de-energize. Upon restoration of power, if the liquid is touching the low level probe, the output relay and LED indicator will re-energize. If the liquid level is below the low level probe, the output relay and LED indicator remain de-energized until the NC reset switch is opened. Features & Benefits Ordering Information MODEL Operation Automatic Reset (Reset switch not connected): When liquid rises to low level cutoff probe, output relay and LED indicator energize. When liquid falls below the low level cutoff probe, the output relay and LED indicator de-energize after a fixed time delay. RESET Manual/automatic Manual/automatic Manual/automatic Power outage manual reset Manual/automatic Power outage manual reset Power outage manual reset Power outage manual reset Power outage manual reset Manual/automatic Power outage manual reset FEATURES BENEFITS Isolated 12VAC probes Prevents scale buildup on probe Open PCB design Cost effective design for OEM low liquid level cutoff protection Conformally coated PCB Protects against moisture and corrosion LED indication Visual indication output relay is energized Power outage protection (see ordering table for models) Automatically resets the unit when power is restored and the water level is acceptable 24VAC & 120VAC models meet UL353 Required for use as a low level limit switch If you don’t find the part you need, call us for a custom product 800-843-8848 © 2016 Littelfuse Protection Relays & Controls www.littelfuse.com/ www.littelfuse.com/llc8 Rev: 1-A-062716 Protection Relays Pump Controls and Liquid Level Controls LLC8 SERIES Accessories P1015-13 (AWG 10/12), P1015-64 (AWG 14/16), P1015-14 (AWG 18/22) Female Quick Connect These 0.25 in. (6.35 mm) female terminals are constructed with an insulator barrel to provide strain relief. P1015-18 Quick Connect to Screw Adapter Screw adapter terminal designed for use with all modules with 0.25 in. (6.35 mm) male quick connect terminals. PHST-38QTN Electrode Designed for a maximum steam pressure of 240 PSI; 400° F. UL353 Recognized. LLP-24 Threaded Probe (24”) Threaded stainless steel probe measuring 24” (61 cm) long. For use with PHST-38QTN liquid level control electrodes. © 2016 Littelfuse Protection Relays & Controls www.littelfuse.com/ www.littelfuse.com/llc8 Specifications Control Type Resistance sensing for conductive liquids with time delay Sense Voltage 12VAC nominal at probe terminals Sense Resistance Fixed 5K - 250KΩ Sense Resistance Tolerance ±10% Time Delay Tolerance ±20% Repeat Accuracy ±10% Time Delay vs Temp. & Voltage ±10% Power Outage Reset Delay ≤1s Input Voltage 24, 120, or 230VAC Tolerance 24VAC -15% - 20% 120 or 230VAC -20% - 10% AC Line Frequency 50/60 Hz Output Type Electromechanical relay Form Isolated SPDT Rating 10A resistive @ 120/240VAC; 1/4 hp @ 125VAC; 1/2 hp @ 250VAC Protection Surge IEEE C62.41-1991 Level A Isolation Voltage ≥ 2500V RMS input to output terminals Mechanical Mounting 0.5 in. (12.7 mm) x .187 (4.76 mm) dia. nylon standoffs (3) Termination Dimensions H 63.5 mm (2.5”); W 55.6 mm (2.19”); D 47.8 mm (1.88”) Electrical 0.25 in. (6.35 mm) male quick connect terminals Reset Switch & Probe(s) 0.187 x 0.03 in. (4.75 x 0.76 mm) male quick connect terminals Environmental Operating/Storage Temperature -40° to 60°C / -40° to 80°C Coating Printed circuit board is conformal coated to resist moisture & corrosion Humidity 95% relative, non-condensing Weight ≅ 5 oz (141.7 g) Rev: 1-A-062716