Autotrol 255 Logix

Summary

Product identification

The AUTOTROL 255 CONTROL VALVE LOGIX SERIES is a water purification valve.

Timer Characteristics

740 Time Clock

• Electronic time clock (chronometric)
• 1- or 99-day regeneration setting (days interval) or days of the week
• High efficiency regeneration sequence
• 12 V operation
• Filter or conditioner setting in one control
• Operates 255, 263, 268 with one controller

742 Time Clock

• Same features as the 740 Time Clock, plus:
• Fully programmable cycle times
• Salt setting in 10-grams increments
• Optional no-salt detector
• Operates 255, 263, 268, 278 and Magnum IT with one controller

760 Demand

• Electronic demand (volumetric)
• Calendar override
• 12 V operation
• 28-day variable reserve
• High efficiency regeneration sequence
• Automatic capacity calculations
• Operates 255, 263, 268 with one controller

762 Demand

• Same features as the 760, plus:
• Fully programmable cycle times
• Salt setting in 10-grams increments
• Optional no-salt detector
• Operates 255, 263, 268, 278, and Magnum IT with one controller

764 Demand

• Same features as the 762, plus:
• Multi-tank applications (twin alternating, multi-tank parallel)
• Control lockout
• Remote regeneration

Valve Specifications

Valve Body

• Glass-filled thermoplastic – NSF Listed material

Rubber Components

• 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)

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 application

Electrical

Controller Operating Voltage

• 12 VAC (Requires use of Pentair Water 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 – All Controllers

• All controllers require the use of a Pentair supplied transformer.
• Transformer Output Voltage: 12 VAC 150 mA
• Transformer Input Options: 230 VAC 50/60 Hz
• Transformer Plug Options: United Kingdom Plug, Mainland Europe Plug

Mechanical / Hydraulic

Flow Rates (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)

Valve Connections

• Tank Thread: 2½ inches – 8, male
• Brine Line: ¼ inch or ⅜ inch NPT, male; air check built into valve
• Inlet/Outlet Manifold (brass or thermoplastic): 1 inch NPT or BSPT, female
• Inlet/Outlet Manifold (thermoplastic): ¾ inch NPT or BSPT, male
• Inlet/Outlet Manifold (thermoplastic): ½ inch NPT or BSPT, male
• Distributor Tube (diameter): 27 mm (1.050 inch) or 20.6 mm (13⁄16 inch)
• Drain Line: ½ inch (manifold dependent)
• Distributor Tube (length): 29 mm ± 3 mm (1⅛ ± ⅛ inch) above top of tank

Flow Rate vs Pressure Drop

See the official PDF for exact tabulated values.

Backwash Flow Control

• Turbine for Demand Units: Standard manifold, 1-inch Autotrol Turbine
• 255 BACKWASH FLOW – Cv = 1.20
• 255 SERVICE FLOW – Cv = 3.99

Bypass Valve

• Thermoplastic, 1-inch flow path, 13mm (½ inch) NPT male, drain

Bypass Inlet-Outlet Fitting Kits

• Copper, Sweat Tube Adapter
• CPVC, Solvent Weld Tube Adapter
• Plastic NPT or BSPT Pipe Adapter
• Stainless steel NPT or BSPT Pipe Adapter
• Brine Refill Controls: 25 or 19 mm (1 inch or ¾ inch)
• Brine Refill Controls: 25 or 19 mm male (1 inch or ¾ inch)
• Brine Refill Controls: 0.33 gpm (1.25 Lpm) fixed
• Brine Refill Controls: 0.14 gpm (0.53 Lpm) fixed – optional for small tank applications

Dimensions

See the official PDF for exact tabulated values.

Injector Performance

*New injectors for high-efficiency regeneration sequence are standard with Logix Controllers. NOTE: Actual injector performance is dependent on the resin used, tank geometry, elevated drain, etc. This injector data was taken using an empty tank (no resin).

Injector «F» (Peach)

• For 7-inch Tanks

Injector «G» (Tan)

• For 8-inch Tanks

Injector «J» (Light Blue)

• For 10-inch Tanks

Injector «K» (Pink)

• For 12-inch Tanks

Injector «H» (Light Purple)

• For 9-inch Tanks

Injector «L» (Orange)

• For 13- and 14-inch Tanks

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