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Fontana FS-354AQ-DP Antique Commercial Automatic Sensor Faucet: Automatic Operating Sequence & Control Logic

This automatic operating-sequence and control-logic resource supports architects, plumbing engineers, electrical engineers, specifiers, contractors, installers and facility teams coordinating the Fontana FS-354AQ-DP commercial automatic sensor faucet. The diagram establishes the complete sequence from standby monitoring and infrared hand detection through electronic signal processing, solenoid-valve actuation, water delivery, hand removal and automatic shutoff. It also identifies the adjustable sensing range, response timing, automatic timeout protection, AC/DC power options and principal interaction between the sensor, electronic control module and solenoid valve.

FS-354AQ-DP Automatic Sensor Control Sequence

The FS-354AQ-DP operates through an infrared sensor, electronic control module and electrically actuated solenoid valve. During standby, the faucet continuously monitors its configured detection zone. When a user's hand enters the sensing field, the sensor transmits an activation signal to the controller. The controller processes the signal and energizes the solenoid valve, allowing water to flow. When the hand leaves the sensing zone, the signal ends and the valve closes automatically.

  • Model: FS-354AQ-DP
  • Fixture type: Commercial automatic sensor faucet
  • Sensor technology: Infrared touchless detection
  • Detection distance: Adjustable 16–32 cm (6.3–12.6 in)
  • Response time: Less than 1 second
  • Shutoff after hand removal: Less than 2 seconds
  • Automatic timeout: 30 seconds, factory default
  • Sensor connection: Sensor cable to electronic control module
  • Water-control component: Solenoid valve
  • Control component: Electronic control module
  • Power: DC 6V (4 × AA) or AC 110–220V, 50–60Hz
  • Water flow: 1.2 GPM (4.54 L/min) at 60 PSI
  • Supply connection: G1/2 in (DN15)
  • Recommended front service clearance: 250–300 mm (9.8–11.8 in)
  • Application: Indoor commercial use
Product Page Installation Guide

Required Automatic Operating Sequence & Control Logic Drawing Package

The control-logic drawing should establish the complete operational sequence from standby monitoring to automatic water shutoff. The infrared sensor, detection zone, sensor cable, electronic controller, solenoid valve, water inlet and selected power source should be shown as an integrated system. Response timing, sensing distance, shutoff timing and automatic timeout protection should also be identified so the system can be tested during commissioning and future maintenance.

Automatic Operating Sequence & Control Logic

Shows the complete operating sequence for the FS-354AQ-DP from sensor standby through user detection, signal processing, solenoid activation, water flow, hand removal and automatic shutoff. The diagram also identifies the controller, water supply and AC/DC power architecture.

1. Sensor Standby Mode

When no valid target is present, the infrared sensor remains in standby mode and monitors the configured detection zone. The solenoid valve remains closed and no water is delivered through the faucet.

2. Hand Enters Detection Zone

Operation begins when the user's hand enters the effective infrared sensing area beneath the faucet outlet. The detection distance can be adjusted between approximately 16 and 32 cm (6.3–12.6 in).

3. Infrared Sensor Detects User

The infrared sensor identifies the hand within the valid detection zone and initiates the electronic activation sequence. The diagram identifies a response time of less than one second.

4. Sensor Signal Sent to Controller

The activation signal travels through the sensor cable from the faucet to the electronic control module below the deck. The controller receives and processes the sensor input before actuating the water-control valve.

5. Controller Energizes Solenoid

After validating the activation signal, the electronic control module sends an electrical output to the solenoid valve. The controller therefore serves as the interface between the infrared sensor and water-control assembly.

6. Solenoid Opens & Water Flows

The energized solenoid valve opens the controlled water path, allowing supply water to travel through the valve and faucet assembly to the outlet. The supplied diagram identifies a flow of 1.2 GPM (4.54 L/min) at 60 PSI.

7. Hand Removed & Water Shuts Off

When the user's hand leaves the detection field, the activation signal terminates. The controller de-energizes the solenoid valve, which closes the water path. The diagram identifies shutoff within less than two seconds after hand removal.

30-Second Timeout Protection

If continuous detection extends beyond the factory-default 30-second timeout, the controller initiates automatic shutoff. This sequence protection limits unnecessary continuous water delivery.

Engineering note: The control sequence should be verified after installation using the completed faucet, basin, sensor, controller, solenoid valve and selected AC or DC power configuration. Confirm detection, response, valve opening, water delivery, hand-removal shutoff and 30-second timeout operation before final commissioning.

Control Logic & Commissioning Considerations

Sensor Window

Keep the infrared sensor window clean and unobstructed so the detection field can reliably identify a user's hands within the configured sensing distance.

Sensor Cable

Verify that the sensor cable is securely connected between the faucet and control module and that wiring is protected from strain, sharp edges and accidental disconnection.

Control Module

Keep the electronic controller accessible below the counter so sensor input, power connections and solenoid output can be inspected during testing and service.

Solenoid Response

Confirm that the solenoid valve opens promptly when the controller receives a valid activation signal and closes when the detection signal terminates.

Detection Range

Adjust the nominal 16–32 cm sensing range so normal handwashing movements activate the faucet without creating unintended sensing from nearby objects or surfaces.

Service Access

Maintain approximately 250–300 mm (9.8–11.8 in) of recommended front clearance for access to the controller, solenoid valve, wiring and associated service components.

Automatic Control-System Components

1. Infrared Sensor / Detection Zone The faucet-mounted infrared sensor continuously monitors the configured activation area and detects the user's hand when it enters the sensing field. 2. Sensor Signal The sensor cable transmits the faucet's infrared detection signal to the below-deck electronic control module. 3. Electronic Control Module The electronic controller processes and validates the sensor signal and determines when the solenoid valve should be energized or released. 4. Solenoid Activation The controller sends an electrical command to the solenoid valve after a valid infrared activation signal has been processed. 5. Automatic Water Flow The energized solenoid opens the supply path and allows water to flow automatically from the building supply through the faucet outlet. 6. Automatic Shutoff When the user's hand leaves the sensing zone, the controller ends valve activation and the faucet shuts off automatically.

Control Logic Parameters & Operating Requirements

  • Adjustable Detection Distance The infrared detection distance is identified as adjustable from approximately 16 to 32 cm (6.3–12.6 in).
  • Response Time The supplied control-logic diagram identifies a response time of less than one second after valid user detection.
  • Hand-Removal Shutoff After the user's hand leaves the detection field, the supplied diagram identifies water shutoff within less than two seconds.
  • Automatic Timeout The controller includes a factory-default 30-second automatic timeout if continuous detection persists.
  • Sensor-to-Controller Interaction The faucet sensor communicates with the electronic control module through the dedicated sensor cable.
  • Controller-to-Solenoid Interaction The electronic control module sends the actuation command to the solenoid valve responsible for automatic water delivery.
  • Power Configuration The supplied control diagram supports DC 6V power using four AA batteries or AC 110–220V at 50–60Hz.
  • Water Supply & Flow The diagram identifies a G1/2 in (DN15) supply connection and rated water flow of 1.2 GPM (4.54 L/min) at 60 PSI.

Project verification: The automatic operating-sequence and control-logic drawing is a coordination and commissioning resource and should not be scaled. Before placing the faucet into service, verify the infrared sensor window, 16–32 cm adjustable detection range, less-than-one-second response time, sensor-cable connection, electronic control-module operation, solenoid-valve actuation, water-flow response, less-than-two-second shutoff after hand removal, 30-second factory-default automatic timeout, DC 6V or AC 110–220V power arrangement, G1/2 in (DN15) supply connection and recommended 250–300 mm front service clearance. Test the complete operating sequence after final installation and confirm consistent touchless activation and automatic shutoff.