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Fontana Commercial Sensor Faucets™ | Architectural and Engineering Resource

Fontana FS-354AQ-DP Antique Commercial Automatic Sensor Faucet: Hot-and-Cold Water Mixing Configuration

This hot-and-cold water mixing configuration resource supports architects, plumbing engineers, specifiers, contractors, installers and facility teams coordinating tempered-water delivery to the Fontana FS-354AQ-DP commercial automatic sensor faucet. The diagram establishes the separate hot and cold building supplies, individual isolation valves, below-deck mixing valve, mixed-water outlet, control-box inlet and outlet, flexible faucet hose, sensor cable and complete water path from the building piping to the faucet.

Fontana FS-354AQ-DP Tempered-Water Supply Configuration

The FS-354AQ-DP hot-and-cold configuration uses separate building hot and cold water branches that are individually isolated before entering a below-deck mixing valve. The mixing valve combines the two supplies to establish the required mixed-water temperature. The mixed outlet then feeds the control-box / solenoid-module inlet, and the controlled outlet is routed through a flexible hose to the deck-mounted faucet body.

  • Model: FS-354AQ-DP
  • Fixture type: Commercial automatic sensor faucet
  • Installation: Deck mounted
  • Water configuration: Hot-and-cold supply with below-deck mixing
  • Connection size: G1/2 in (DN15) / 1/2-inch
  • Cold-water isolation: Dedicated accessible isolation valve
  • Hot-water isolation: Dedicated accessible isolation valve
  • Temperature-control component: Below-deck mixing valve
  • Typical mixed-water setting shown: 35–45°C (95–113°F)
  • Mixed-water connection: Mixing-valve outlet to control-box inlet
  • Controlled outlet: Control-box outlet to faucet body
  • Sensor connection: Sensor cable from faucet to control box
  • Power: DC 6V (4 × AA) or AC 110–220V, 50/60Hz
  • Control component: Control box / solenoid module
  • Service requirement: Keep mixing valve, isolation valves, hoses and control box accessible
Product Page Installation Guide

Required Hot-and-Cold Water Mixing Drawing Package

The mixing configuration drawing should clearly distinguish the hot, cold and mixed-water portions of the plumbing system. Separate hot and cold G1/2 (DN15) building supplies should terminate at accessible isolation valves before entering the below-deck mixing valve. The mixed outlet should then be shown continuing to the control-box inlet, through the solenoid-controlled waterway and from the control-box outlet to the faucet body. The sensor cable and electrical supply should be coordinated with the hydraulic components while remaining physically accessible.

Hot-and-Cold Water Mixing Configuration

Shows the complete tempered-water arrangement for the FS-354AQ-DP, including independent hot and cold building supplies, isolation valves, below-deck mixing valve, mixed-water outlet, control box, outlet hose, sensor cable and deck-mounted faucet body.

Cold-Water Supply Branch

The cold building supply is shown as a G1/2 (DN15) connection feeding a dedicated isolation valve before entering the cold-water side of the below-deck mixing valve. The branch should remain accessible for isolation, adjustment and servicing.

Hot-Water Supply Branch

The hot building supply uses a separate G1/2 (DN15) connection and dedicated isolation valve before entering the hot-water side of the mixing valve. The hot branch should be coordinated with the building hot-water system and kept accessible below the deck.

Hot & Cold Isolation Valves

Individual isolation valves are provided on both supply branches upstream of the mixing valve. This arrangement allows the hot and cold lines to be shut off independently during installation, adjustment, commissioning or service.

Below-Deck Mixing Valve

The mixing valve is installed below the countertop between the isolated hot and cold branches and the control-box inlet. Its purpose is to combine the two supplies and establish the required mixed-water temperature before water reaches the automatic control assembly.

Mixed-Water Temperature Setting

The diagram identifies a typical mixed-water outlet set point of 35–45°C (95–113°F). The desired temperature should be established at the mixing valve before the faucet is placed into regular service and verified for the specific project application.

Mixed-Water Outlet to Control Box

After the hot and cold supplies are blended, the mixed-water outlet line continues from the mixing valve to the control-box inlet. The flexible inlet connection should be routed without kinks, twisting or unnecessary strain on fittings.

Control Box & Faucet Outlet

The mixed supply enters the control box / solenoid module, where automatic sensor commands control water delivery. The control-box outlet then connects through a flexible hose to the faucet body above the countertop.

Sensor & Power Architecture

The faucet sensor cable connects to the below-deck control module and should be routed clear of sharp edges and moving components. The system supports DC 6V using four AA batteries or AC 110–220V at 50/60Hz.

Engineering note: The hot-and-cold mixing diagram is a schematic coordination resource and should not be scaled. Verify the G1/2 / DN15 connections, hot and cold isolation points, mixing-valve orientation, required mixed-water temperature, flexible-hose routing, control-box inlet and outlet orientation, sensor cable and power configuration against the approved project documentation before installation.

Hot-and-Cold Water Mixing Coordination Considerations

Hot & Cold Isolation

Provide separate accessible shut-off valves on the hot and cold building branches so either supply can be isolated independently during adjustment, maintenance or component replacement.

Mixing-Valve Location

Install the mixing valve below the deck between the isolated hot and cold supply branches and the control-box inlet. Maintain sufficient working space for adjustment and future service.

Temperature Adjustment

Set and verify the required mixed-water outlet temperature before placing the faucet into service. The drawing shows a typical reference range of 35–45°C (95–113°F).

Hose Routing

Route the mixed-water inlet hose and faucet outlet hose without twisting, kinking or excessive bends. Support the lines where necessary so fittings are not subjected to unnecessary mechanical strain.

Control-Box Access

Keep the control box / solenoid module accessible below the countertop so the inlet, outlet, sensor cable, power connection and enclosure can be reached for commissioning and service.

Supply-Line Flushing

Flush both hot and cold building supply lines before connecting the mixing valve and control assembly. Inspect all completed joints and fittings for leakage before placing the system into service.

Hot-and-Cold Mixing System Components

1. Faucet Body The deck-mounted automatic sensor faucet receives the controlled mixed-water supply through the flexible outlet hose connected beneath the fixture. 2. Outlet Hose to Faucet The flexible outlet hose carries sensor-controlled mixed water from the control-box outlet to the faucet body above the countertop. 3. Mixed-Water Inlet Hose The mixed-water inlet hose connects the outlet of the below-deck mixing assembly with the designated inlet of the control box / solenoid module. 4. Sensor Cable The sensor cable links the faucet's automatic detection system with the below-deck control module and should remain protected and accessible. 5. Control Box / Solenoid Module The control module receives the tempered-water supply and automatically regulates flow between its inlet and the faucet-side outlet. 6. Cold-Water Isolation Valve The dedicated cold-side isolation valve allows the cold building supply to be independently shut off upstream of the mixing valve. 7. Hot-Water Isolation Valve The dedicated hot-side isolation valve provides local control of the hot building supply before it enters the temperature-mixing assembly. 8. Below-Deck Mixing Valve The mixing valve combines the isolated hot and cold water supplies and establishes the mixed outlet temperature supplied to the faucet-control system. 9. Mixed-Water Outlet Line The tempered-water outlet continues from the mixing valve toward the control-box inlet before automatic flow control occurs. 10. Supply Fittings & Adapters Compatible fittings and adapters complete the G1/2 (DN15) connections between the building piping, isolation valves, mixing valve and flexible hoses.

Temperature-Control & Installation Requirements

  • Hot-and-Cold Supply Arrangement Separate G1/2 (DN15) hot and cold building lines feed individual isolation valves before entering the below-deck mixing valve.
  • Mixing-Valve Placement Install the mixing valve below the countertop between the isolated supply branches and the mixed-water line serving the control-box inlet.
  • Mixed-Water Flow Path The hydraulic sequence is: hot + cold supplies → isolation valves → mixing valve → mixed-water inlet → control-box inlet → control-box outlet → flexible outlet hose → faucet.
  • Typical Temperature Setting The supplied diagram identifies a typical mixed-water outlet set point of 35–45°C (95–113°F). Final temperature should be selected and verified for the actual project requirements.
  • Required Service Access Maintain clear below-deck access to the mixing valve, hot and cold isolation valves, control box, flexible hoses, sensor connection and associated supply fittings.

Project verification: The hot-and-cold water mixing configuration is a coordination resource and should not be scaled. Before installation or commissioning, verify the G1/2 / DN15 hot and cold connections, isolation-valve locations, mixing-valve type and orientation, required mixed-water temperature, hose and fitting compatibility, control-box inlet and outlet connections, sensor-cable routing, selected DC or AC power supply and required service access against the approved FontanaShowers documentation, project plumbing design and locally applicable requirements.