The SENTRY II Series 970 is an Electronic On-Demand Metered System, likely a water softener or similar water treatment device, designed for residential or light commercial use. This service manual provides comprehensive information for installation, programming, operation, and troubleshooting.
Function Description:
The SENTRY II Series 970 system is an electronic, on-demand metered system, primarily functioning as a water softener. It automatically regenerates based on water usage, ensuring a continuous supply of softened water. The "on-demand metered" aspect means it tracks the amount of water treated and initiates regeneration only when necessary, rather than on a fixed schedule. This optimizes salt and water usage, making it more efficient than time-based systems. The control valve, fittings, and bypass are designed to accommodate minor plumbing misalignments. The system includes a control valve with an electronic controller, a resin tank (the tall black cylinder), and a salt container (the shorter black cylinder) for brine solution preparation.
Important Technical Specifications:
- Operating Pressures: Minimum 20 psi (138 kPa) to Maximum 125 psi (862 kPa). The warranty is void if the system is exposed to water pressure exceeding 100 psi, necessitating a pressure reducing valve on the inlet line if pressure is high.
- Operating Temperatures: Minimum 40°F (4°C) to Maximum 110°F (38°C). The system should not be installed in locations where the temperature drops below 40°F.
- Electrical Requirements: 0.5 Amperes, 110 Volts (other options available). It comes with a 15-foot power cord with a built-in transformer and requires a standard 120V 60Hz electrical outlet. The outlet must be uninterrupted.
- Drain Line: Minimum 1/2" pipe size. For backwash flow rates exceeding 7 gpm or lengths over 20 feet, a 3/4" drain line is required. The maximum height for an overhead drain line should not exceed 8 feet above the top of the water softener.
- Brine Line: A 3/8" brine line, approximately 4 feet long, connects to the salt container.
- Salt Container: Should not be filled more than 6" from the top. A minimum of 100 lbs of extra coarse water softener salt is recommended during initial fill.
- Relay Specifications: Includes a relay socket (Idec Model SH3B-05C) and a relay (Idec Model RH2LB-U-AC12V) for user applications, providing two sets of dry contacts.
- Internal Components: Features a WS1 Spacer Stack Assembly, Drive Cap Assembly, WS1ER Drive Back Plate, WS1 Piston Assembly Downflow, WS1 Regenerant Piston, and various O-rings (228, 337, 215).
- Injector Assembly: Includes an Injector Cap, O-ring 135, Injector Screen, and various WS1 Injector ASY (e.g., A Black, B Brown, C Violet, D Red, E White, F Blue, G Yellow, H Green, I Orange, J Light Blue, K Light Green). The injector plug and injector each contain O-rings 011 (lower) and 013 (upper).
- Brine Elbow Assembly: Comprises a WS1 Refill Port Plug ASY, Elbow Locking Clip, Polytube insert 3/8, Nut 3/8, Elbow Cap 3/8, O-ring 019, WS1 RFC Retainer ASY, and WS1 RFC.
- Drain Fitting Breakdown: Available in 3/4" and 1" sizes, including Elbow Locking Clip, Polytube insert, WS1 Nut, WS1 Drain Elbow, O-ring 019, WS1 DLFC Retainer ASY, and various WS1 DLFC (Drain Line Flow Control) options ranging from 0.7 gpm to 25.0 gpm depending on the fitting size.
- Meter Assembly: Consists of WS1 Nut 1" QC, WS1 Meter ASY, WS1 Turbine ASY, O-ring 215, and WS1 Meter Plug ASY.
- Installation Fitting Assemblies: Various connection kits are available, including 1" PVC Male NPT Elbow, 3/4" & 1" PVC Solvent 90°, 1" Brass Sweat, and 3/4" Brass Sweat. Each kit includes plastic nuts, split rings, O-rings, and brass connectors.
- Bypass Assembly: Includes WS1 Nut 1" Quick Connect, WS1 Split Ring, O-Ring 215, WS1 Bypass 1" Rotor, WS1 Bypass Cap, WS1 Bypass Handle, WS1 Bypass Rotor Seal Retainer, O-ring 135, O-ring 112, and O-ring 214.
Usage Features:
- Electronic Controller: The system features an electronic controller for setting the time of day, water hardness, day override, and regeneration times.
- On-Demand Regeneration: The system regenerates based on actual water usage, indicated by the "Softening" display flashing when water is being treated.
- Manual Regeneration: Users can manually initiate a regeneration cycle by pressing and holding the REGEN button.
- Day Override: A programmable feature to force a regeneration after a preset number of days, regardless of water usage. The default is 15 days, but it can be turned off by setting it to less than 1.
- Display Options: The controller can display either the current time of day or the remaining capacity. Pressing the NEXT button alternates between these displays.
- Regeneration Status: During regeneration, the display shows the current cycle (e.g., "BACKWASH," "BRINE," "RINSE," "FILL") and the remaining time for that cycle. "REGEN TODAY" appears if a regeneration is scheduled for the preset time.
- Bypass Valve: Allows users to bypass the softener for specific water needs (e.g., outside hose bibs) or for maintenance, ensuring uninterrupted water supply to the house. The bypass valve has clear "ON" and "OFF" positions for treated water exits, supply water enters, and shutting off water from the house and the valve.
Maintenance Features:
- Easy Component Access: The manual provides detailed breakdowns of the front cover, drive assembly, internal parts, injector assembly, brine elbow assembly, drain fittings, meter assembly, and bypass assembly, facilitating component identification and replacement.
- Troubleshooting Procedures: A comprehensive troubleshooting guide helps diagnose common issues such as the timer not displaying, no softening/filtering, incorrect regeneration times, and error codes. Solutions range from checking power connections and resetting the controller to replacing specific components like the transformer, PC board, motor, or pistons.
- Lubrication Guidelines: Emphasizes avoiding hydrocarbon lubricants or spray silicone, and advises against using silicone on red or clear lip seals. Silicon lubricant can be used on black o-rings but is not necessary.
- Tool Usage: Nuts and caps are designed for hand-tightening or use with a special plastic wrench; pliers can be used if necessary, but pipe wrenches should be avoided. Screwdrivers should not be used in slots on caps or tapped with a hammer.
- Sealant Guidelines: Teflon tape is required on 1" NPT elbow, 1/4" NPT connections, and drain line connections, but not on nut connections or caps due to o-ring seals. Pipe dope or other sealants on threads are prohibited.
- Electronic Reset: After valve maintenance involving the drive assembly or drive cap assembly and pistons, the electronics should be reset by pressing and holding NEXT and REGEN buttons for 3 seconds, or by unplugging and re-plugging the power source jack. This re-establishes the service piston position.
- Salt Tank Cleaning: Recommended approximately once a year to remove dirt, rocks, and debris.
- Battery Replacement: The PC board uses a 3-volt lithium coin cell type 2032 battery. The manual illustrates the correct orientation for replacement.
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