Autotrol 255 / 460

Summary

Product identification

• Product line: Autotrol 255 Control Valve - 460 Series
• Type: Electronic time clock (chronometric)
• Control features:
  • 1- or 30-day regeneration setting (Time Clock)
  • Capacity setting, calendar override, 7 days variable reserve (Volumetric)

Operating limits

• Recommended Operating Pressure: 1.38 - 8.27 bar (20 - 120 psi)
• Hydrostatic Test Pressure: 20.69 bar (300 psi)
• Water Temperature: 2-38°C (35-100°F)
• Ambient Temperature: 2-48.9°C (35-120°F) (Recommend use of outdoor cover for direct sunlight applications)

Electrical

• Controller Operating Voltage: 12 VAC (Requires Pentair supplied transformer)
• Input Supply Frequency: 50 or 60 Hz (Controller configuration dependent)
• Motor Input Voltage: 12 VAC
• Controller System Power Consumption: 3 W average
• Transformer Output Voltage: 12 VAC 150 mA
• Transformer Input Options: 230 VAC 50/60 Hz

Mechanical / hydraulic

• Valve Body Material: Glass-filled thermoplastic – NSF Listed material
• Rubber Components Material: Compounded for cold water – NSF Listed material
• Valve Materials Certification: WQA Gold Seal Certified to ORD 0902, NSF/ANSI 44, CE, ACS
• Weight (Valve with Control): 1.8 kg (4 lbs)
• Tank Thread: 2-½ inches – 8, male
• Brine Line: ¼ or ⅜ inch NPT, male; air check built into valve
• Inlet/Outlet Manifold: 1 inch NPT or BSPT, female (brass or thermoplastic)
• Distributor Tube Diameter: 27 mm (1.050 inch) or 20.6 mm (13⁄₁₆ inch)
• Distributor Tube Length: 29 mm ± 3 mm (1-⅛ ± ⅛ inch) above top of tank
• Drain Line: ½ inch (manifold dependent)

Flow Rate (Valve Only)

• Service @ 1.03 bar (15 psi) drop: 3.52 m³/h (15.5 gpm)
• Backwash @ 1.72 bar (25 psi) drop: 1.36 m³/h (6.0 gpm)
• Service Kv: 3.4 (Cv = 3.99)
• Backwash Kv: 1.0 (Cv = 1.20)

Bypass Inlet-Outlet Fitting Kits

• Thermoplastic: 1-inch flow path, ½ inch NPT male, drain bypass
• Copper, Sweat Tube Adapter: 25 or 19 mm (1 inch or ¾ inch)
• CPVC, Solvent Weld Tube Adapter: 25 or 19 mm (1 inch or ¾ inch)
• Plastic NPT or BSPT Pipe Adapter: 25 or 19 mm male (1 inch or ¾ inch)
• Stainless steel NPT or BSPT Pipe Adapter: 25 or 19 mm male (1-inch or ¾ inch)

Brine Refill Controllers

• Standard: 0.33 gpm (1.25 Lpm) fixed
• Optional (small tanks): 0.14 gpm (0.53 Lpm) fixed

Disclaimer: This extraction may miss figures, footnotes, or revisions. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror