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Fontana FS-354AQ-DP Antique Commercial Automatic Sensor Faucet: Service, Maintenance, and Component-Access Diagram

This service, maintenance and component-access resource supports facility managers, maintenance personnel, plumbing contractors, installers and specifiers responsible for the Fontana FS-354AQ-DP commercial automatic sensor faucet. The diagram identifies the principal service zones for the inline filter / strainer, solenoid valve, flexible hoses, electronic control box, sensor and vandal-resistant aerator. It also establishes the minimum under-counter service clearance, diagnostic indicators, battery-replacement access and basic component-removal procedures needed for routine inspection and maintenance.

FS-354AQ-DP Serviceable Component Architecture

The FS-354AQ-DP installation provides separate service points for the faucet's hydraulic and electronic components. Routine maintenance can include cleaning the inline strainer, removing or replacing the solenoid valve, replacing flexible hoses, accessing the electronic control box, adjusting the sensor, servicing the aerator and replacing the four-AA battery set. The under-counter installation should remain accessible so these tasks can be completed without disturbing the countertop or basin.

  • Model: FS-354AQ-DP
  • Fixture type: Commercial automatic sensor faucet
  • Service Zone 1: Inline filter / strainer access
  • Service Zone 2: Solenoid-valve access
  • Service Zone 3: Flexible-hose access
  • Service Zone 4: Electronic control-box access
  • Service Zone 5: Sensor adjustment access
  • Service Zone 6: Aerator servicing access
  • Minimum under-counter clearance: 250 mm (9.84 in)
  • Battery configuration: 4 × AA alkaline batteries, DC 6V
  • Low-battery indication: Red LED flashes
  • Strainer maintenance: Remove bowl and clean screen
  • Solenoid servicing: Disconnect union connections for removal
  • Sensor adjustment: Accessible from below the deck
  • Aerator: Vandal-resistant, removable with service tool
Product Page Installation Guide

Required Service & Component-Access Drawing Package

The service drawing should identify each component that requires inspection, cleaning, adjustment or replacement and establish a clear route for technician access. The inline strainer, solenoid valve, flexible hoses and electronic control box should remain reachable below the counter, while the sensor and aerator require dedicated access at the faucet assembly. A minimum clear working zone should be preserved in front of the under-counter components so maintenance can be performed without dismantling surrounding casework.

Service, Maintenance & Component-Access Diagram

Shows the complete service architecture for the FS-354AQ-DP, identifying six principal access zones for the strainer, solenoid valve, hoses, control box, sensor and aerator together with the minimum under-counter service clearance.

1. Strainer Access

The inline filter / strainer is serviced from below the counter. Shut off the water supply, unscrew the filter bowl counterclockwise, remove the internal screen and rinse the screen under running water before reassembly.

2. Solenoid-Valve Access

The solenoid valve can be removed after the water supply has been isolated and the union connections on both sides have been disconnected. After servicing or replacement, reinstall the valve and inspect the completed joints for leaks.

3. Flexible-Hose Access

The flexible water hoses can be removed by loosening the compression nuts with the appropriate wrench. Replacement hoses should be installed securely and checked for proper routing and leak-free connections before the faucet is returned to service.

4. Control-Box Service

The electronic control box is accessed by removing the four cover screws and opening the enclosure. Internal access supports diagnostics, LED inspection, adjustment and battery replacement before the cover is secured again.

5. Sensor Adjustment

The sensor-adjustment point is accessible from below the faucet neck. Use the designated adjustment tool to set the sensor response as required and test activation after completing the adjustment.

6. Aerator Servicing

The faucet incorporates a vandal-resistant aerator. Use the appropriate flat service wrench to loosen the aerator, remove and clean the screen, and reinstall the assembly hand-tight after maintenance.

Battery Replacement

The control system uses four AA alkaline batteries providing DC 6V power. Replace the batteries when the red LOW BATTERY indicator flashes and observe the polarity markings shown inside the battery compartment.

Minimum Service Clearance

The supplied drawing identifies a minimum 250 mm (9.84 in) clear zone below the countertop for access to the strainer, solenoid, hoses and electronic control components.

Engineering note: Turn off the water supply before performing hydraulic maintenance or component removal. Maintain the specified under-counter access zone, use appropriate tools, inspect connections after reassembly and confirm that all serviced components are secure and leak-free before returning the faucet to normal operation.

Service & Maintenance Coordination Considerations

Water Isolation

Turn off the faucet water supply before removing the strainer, solenoid valve, flexible hoses or other wetted components.

Strainer Cleaning

Inspect and clean the inline strainer periodically to maintain proper flow and reduce debris entering the solenoid-valve assembly.

Leak Inspection

After reassembling plumbing components, inspect union fittings, hose connections, filter joints and solenoid connections for leakage before returning the system to service.

Control-Box Access

Keep the electronic control enclosure accessible so diagnostic indicators, battery components and internal connections can be inspected without removing surrounding fixtures.

Surface Cleaning

Use mild soap and water for routine faucet cleaning and avoid abrasive cleaners that could damage the antique finish or exposed fixture surfaces.

Service Clearance

Maintain at least 250 mm (9.84 in) of clear working space below the counter so serviceable components can be reached for inspection, cleaning and replacement.

Service Zones & Component Functions

1. Strainer Cleaning Remove the lower bowl to access the filter screen, rinse accumulated debris from the screen and reassemble the filter by hand. 2. Solenoid Removal Isolate the water supply, disconnect the union connections on both sides and remove the solenoid valve for inspection or replacement. 3. Hose Replacement Loosen the compression fittings, remove the existing flexible hose and install the replacement hose with secure, properly tightened connections. 4. Control-Box Service Remove the four enclosure screws to access internal diagnostic LEDs, adjustment points and battery components before resecuring the cover. 5. Sensor Adjustment Access the adjustment point beneath the faucet neck, set the required sensor response and test automatic activation after adjustment. 6. Aerator Servicing Use the appropriate aerator service wrench to remove the vandal-resistant outlet assembly, clean its screen and reinstall it securely.

Control-Box Diagnostics & Maintenance Requirements

  • POWER – Green LED A solid green POWER indicator identifies the control system as powered on.
  • SENSOR – Blue LED A flashing blue SENSOR indicator identifies sensor detection activity.
  • VALVE – Yellow LED An illuminated yellow VALVE indicator identifies the solenoid valve as activated.
  • LOW BATTERY – Red LED A flashing red LOW BATTERY indicator signals that the four AA alkaline batteries should be replaced.
  • ERROR – Red LED A solid red ERROR indicator directs the service technician to inspect system connections.
  • Battery Replacement The control system uses four AA alkaline batteries providing DC 6V. Replace the battery set when the red low-battery indicator flashes and observe the indicated polarity orientation.
  • Recommended Service Tools The supplied drawing identifies an adjustable wrench, Phillips screwdriver, 2.5 mm Allen wrench, pliers, Teflon tape and a soft cloth or brush for typical maintenance work.
  • Post-Service Verification After maintenance, restore the water supply, inspect reassembled connections for leakage and confirm sensor activation, solenoid operation and normal water delivery.

Project verification: The service, maintenance and component-access diagram is a maintenance coordination resource and should not be scaled. Before servicing the FS-354AQ-DP, isolate the water supply as required and verify access to the inline strainer, solenoid valve, flexible hoses, electronic control box, sensor and aerator. Maintain the indicated 250 mm (9.84 in) minimum under-counter service clearance, use appropriate service tools, observe battery polarity, inspect diagnostic indicators and check all reassembled connections for leakage. After maintenance, confirm sensor detection, solenoid actuation, water flow and automatic faucet operation before returning the fixture to service.