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Fontana Brio PrimeSense™ Line FS-1095GMG Gun Metal Gray Touchless Bathroom Faucet: Under-Counter Component Layout

This under-counter component-layout resource is intended to support architects, plumbing engineers, electrical engineers, interior designers, millwork fabricators, contractors, installers and facility managers coordinating the Fontana Brio PrimeSense™ Line FS-1095GMG touchless bathroom faucet. The layout identifies the concealed relationship between the faucet mounting stem, sensor cable, braided hot- and cold-water hoses, mixing valve, solenoid valve, electronic control box, power cable, waterproof cable grommet, shutoff valves, basin, drain assembly and required maintenance-access zone beneath the finished countertop.

Fontana Brio PrimeSense™ Line FS-1095GMG Touchless Bathroom Faucet

The Fontana FS-1095GMG uses a concealed under-counter control system that combines the faucet mounting hardware, hot- and cold-water connections, temperature mixing components, electronically controlled solenoid valve, sensor wiring, control box and power supply. Correct component placement is important for reliable operation, leak inspection, electrical protection and future maintenance access.

  • Model: FS-1095GMG
  • Product type: Touchless bathroom faucet
  • Installation: Single-hole deck mount
  • Finish: Gun Metal Gray
  • Water supply: Hot and cold
  • Water connection: G1/2"
  • Control: Electronic control box and solenoid valve
  • Sensor: Infrared touchless operation
  • Sensor range: Approximately 16–32 cm adjustable
  • Flow rate: 1.2 GPM [4.5 L/min] at 60 PSI
  • Mixing: Factory pre-set under-counter mixing valve
  • Power: AC or battery configuration
  • Recommended service clearance: 300 mm [12"] minimum
  • Application: Commercial and institutional washrooms
Product Page Installation Guide

Required Under-Counter Component Layout Drawing Package

The under-counter drawing should present the concealed equipment below the finished countertop in both elevation and plan. The drawing should identify the faucet mounting stem, mounting washer, lock nut, sensor cable, hot- and cold-water hoses, factory pre-set mixing valve, solenoid valve, control box, power connection, waterproof cable penetration, angle stop valves, basin, drain and required service-access envelope. Components should be arranged so that each device can be inspected, disconnected and replaced without removing the lavatory or permanent countertop.

Complete Under-Counter Component Layout

Shows the complete concealed installation below the FS-1095GMG faucet, including the mounting stem, hot- and cold-water supplies, mixing valve, solenoid valve, electronic controller, sensor cable, power connection and service-access zone.

Faucet Mounting Stem

Show the threaded mounting stem immediately below the countertop. The stem should remain accessible for inspection and should not be blocked by the basin, structural rails or permanent cabinet elements.

Mounting Washer

Identify the mounting washer located against the underside of the countertop. Maintain enough working room around the washer for installation and future faucet removal.

Lock Nut

Show the retaining lock nut threaded onto the faucet stem. The nut should remain reachable by hand or appropriate installation tools without removing unrelated plumbing.

Sensor Cable Drop

Show the sensor cable descending from the faucet assembly to the control box. Route the cable in a smooth path and keep it clear of sharp metal edges, cabinet hinges and plumbing joints.

Hot-Water Braided Hose

Identify the braided hot-water hose from the G1/2" hot-water angle stop to the mixing assembly. The hose should remain free of kinks, twisting and excessive tension.

Cold-Water Braided Hose

Show the braided cold-water hose from the G1/2" cold-water angle stop to the mixing valve. Maintain a direct routing path with service access at both connections.

Hot-Water Angle Stop

Provide an accessible hot-water shutoff below the lavatory. The valve should be reachable without removing the control box or other faucet components.

Cold-Water Angle Stop

Provide an accessible cold-water isolation valve serving the faucet. The shutoff location should allow independent fixture maintenance.

Factory Pre-Set Mixing Valve

Show the mixing valve receiving the hot- and cold-water supplies. The valve should be positioned where its connections can be inspected, adjusted if permitted and replaced without disturbing the basin.

Mixing Valve Support

The mixing assembly should not hang unsupported from flexible hoses. Provide a stable installation arrangement that avoids transferring excessive loads to fittings or braided connections.

Solenoid Valve

Identify the electronically controlled valve installed downstream of the mixing assembly. The valve should be accessible for inspection, cleaning and replacement.

Solenoid Flow Direction

Show the intended direction of water flow through the automatic valve assembly. Verify inlet and outlet orientation before the water supply is pressurized.

Valve-to-Faucet Connection

Show the flexible water connection between the automatic valve and faucet inlet. Maintain smooth routing and avoid contact with the basin or drain.

Electronic Control Box

Mount the control box in a dry, stable and accessible location. The enclosure should remain above the lowest cabinet level where practical and away from water-supply joints.

Controller Mounting Plane

Provide a suitable cabinet wall, support panel or mounting surface for the controller. Do not leave the control box loose on the cabinet floor.

Sensor-to-Controller Connection

Identify the low-voltage connection between the faucet sensor cable and electronic controller. Keep connectors dry and accessible for diagnostic testing.

Controller-to-Solenoid Cable

Show the electrical cable between the control box and solenoid valve. The cable should be supported and routed away from water joints and moving cabinet hardware.

AC Power Adapter

Where AC operation is selected, show the approved power adapter and electrical connection in a dry and accessible location separated from possible leakage points.

Battery Power Location

Where battery operation is selected, position the battery enclosure so batteries can be replaced without dismantling plumbing or removing the basin.

Power Cable Route

Show the power cable between the controller and selected power source. Avoid routing electrical cables directly below water-supply connections.

Waterproof Cable Grommet

Show any sealed cabinet penetration required for sensor or power wiring. Use a suitable grommet or protected opening to prevent cable damage and reduce moisture migration.

Basin Envelope

Show the complete underside profile of the basin because the bowl depth can substantially reduce available space for the faucet controller, valves and hoses.

Drain and Trap Envelope

Identify the lavatory drain and trap in relation to the touchless faucet components. Maintain independent access to drainage fittings and electronic equipment.

Drain Separation

Do not support electrical cables, controllers or water hoses on the drain assembly. Maintain physical separation between the faucet system and drainage piping.

Cabinet Floor Clearance

Mount electronic components above the lowest cabinet level where practical to reduce exposure to cleaning water, condensation and minor plumbing leaks.

Front Service Access

Provide an unobstructed front access path to the mixing valve, solenoid valve, controller, power components and shutoff valves.

Minimum Service Clearance

Maintain approximately 300 mm [12"] minimum recommended working clearance within the concealed equipment area where shown in the installation layout.

Component Removal Path

Show how the control box, valve assemblies and power components can be removed through the cabinet opening without removing permanent millwork.

Finished Under-Counter Arrangement

The final installation should keep hoses, valves, cables and electronics organized and separated so facility technicians can identify each component quickly during maintenance.

Engineering note: The under-counter layout should be coordinated after the actual basin, drain, cabinet framing and faucet mounting position are known. Do not locate the controller, solenoid valve or mixing valve using an empty-cabinet assumption. Verify cable reach, hose length, drainage clearances and service access before permanent cabinet panels or shelves are installed.

Required Under-Counter Drawing Views

Front Cabinet Elevation

Show the basin, faucet stem, hot and cold supplies, mixing valve, solenoid valve, control box, power source and front access zone.

Side Cabinet Section

Show the basin depth, mounting hardware, hoses, controller depth and available service space below the countertop.

Under-Counter Plan

Show the basin footprint, trap, angle stops, mixing valve, solenoid valve, controller and all cable and hose routes.

Hydraulic Connection Diagram

Show hot and cold supplies, angle stops, mixing valve, solenoid valve and faucet connection in the correct sequence.

Electrical Connection Diagram

Show the infrared sensor, controller, solenoid valve, AC adapter or battery box and wiring connections.

Service Access Diagram

Show the minimum working area and removal path required for each concealed service component.

Recommended Under-Counter Installation Sequence

1. Confirm Basin Envelope

Verify the final basin depth, drain position and underside support before locating faucet-control equipment.

2. Confirm Water Supplies

Locate accessible G1/2" hot- and cold-water isolation valves within reach of the approved braided hoses.

3. Reserve the Equipment Zone

Set aside a dedicated cabinet area for the mixing valve, solenoid valve, controller and power components.

4. Mount the Mixing Valve

Install the mixing assembly in a stable position with clear access to the hot, cold and mixed-water connections.

5. Install the Solenoid Valve

Install the automatic valve in the approved water-flow direction and maintain adequate clearance for future service.

6. Mount the Control Box

Fasten the electronic controller to a dry cabinet surface above areas likely to collect water.

7. Route Sensor Wiring

Connect the faucet sensor to the controller using a protected, supported cable path.

8. Route Valve Wiring

Connect the solenoid valve to the controller and keep electrical connections away from water joints.

9. Connect Power

Install the approved AC adapter or battery arrangement in an accessible dry location.

10. Route Water Hoses

Connect hot, cold and mixed-water hoses without sharp bends, twisting or unsupported loops.

11. Flush and Pressure Test

Flush the water supply before final connection and inspect all hydraulic joints for leakage.

12. Verify Service Access

Confirm all valves, connectors, mounting hardware and electronic components remain reachable before cabinet completion.

Hydraulic Component Coordination

Hot Supply

Connect the hot-water supply to the designated mixing-valve inlet through an accessible shutoff valve.

Cold Supply

Connect the cold-water supply to the corresponding mixing-valve inlet and preserve access to the isolation valve.

Mixed-Water Outlet

Route the mixed-water outlet toward the solenoid valve in accordance with the approved hydraulic connection sequence.

Solenoid Connection

Maintain serviceable union or hose connections around the automatic valve where provided by the installation arrangement.

Hose Bend Radius

Avoid tight bends immediately adjacent to hose fittings. Provide gentle curves to reduce stress and maintain unrestricted water flow.

Leak Inspection Zone

Keep all water connections visible enough for inspection during commissioning and periodic maintenance.

Electrical & Control Component Coordination

Sensor Connection

Connect the faucet sensor to the designated controller input and secure excess cable without creating tight coils or strain.

Solenoid Connection

Connect the automatic valve to the designated control output and maintain access to the electrical connector.

Controller Protection

Position the controller away from the trap, water-supply unions and cabinet areas subject to cleaning water.

AC Power Location

Where AC power is used, coordinate the adapter and receptacle with the project electrical requirements and maintain dry service access.

Battery Access

Where battery operation is selected, make sure the battery enclosure can be opened and serviced without disconnecting plumbing.

Cable Separation

Keep low-voltage and power wiring organized and separated from hot water piping, sharp metal edges and moving cabinet hardware.

Cabinet & Millwork Coordination

Sink Bowl Clearance

The basin should not press against hoses, sensor wiring or controller connections after final installation.

Drawer Clearance

Drawer boxes and slides should remain outside the faucet equipment zone and must not contact hoses or wiring during operation.

Shelf Clearance

Fixed shelves should not block shutoff valves, the controller, mixing valve or solenoid valve.

Structural Rail Clearance

Coordinate cabinet rails and countertop supports with the faucet mounting stem and service-access zone.

Removable Access Panel

Where concealed cabinetry limits normal access, provide a removable panel sized for inspection and component replacement.

Service Door Swing

Cabinet doors should open sufficiently to allow technicians to reach all concealed faucet components.

Under-Counter Component Layout Notes

  • Dry electronics zone: Mount the controller and power components away from plumbing joints and potential leak points.
  • Accessible shutoff valves: Hot- and cold-water angle stops should remain immediately reachable for maintenance.
  • Component support: Do not allow valves or controllers to hang unsupported from hoses or electrical cables.
  • Hose routing: Keep braided water connections free from sharp bends, crushing and twisting.
  • Cable routing: Keep sensor and power wiring away from cabinet hinges, drawer slides and sharp edges.
  • Drain separation: Do not place the controller or electrical connectors directly below the trap or drainage joints.
  • Cabinet floor: Raise electrical components above areas where cleaning water or leaks may accumulate.
  • Service clearance: Maintain approximately 300 mm [12"] minimum recommended clearance where required for component servicing.
  • Leak testing: Inspect all hydraulic connections before energizing and commissioning the system.
  • Final organization: Label and secure hoses and wiring so future facility technicians can identify system components quickly.

Under-Counter Component Identification

  • Threaded faucet stem: Passes through the countertop and supports the faucet mounting assembly.
  • Mounting washer: Distributes retaining pressure below the countertop.
  • Lock nut: Secures the faucet to the finished deck.
  • Sensor cable: Connects the infrared sensor to the electronic controller.
  • Hot-water hose: Transfers hot water from the angle stop to the mixing valve.
  • Cold-water hose: Transfers cold water from the angle stop to the mixing valve.
  • Mixing valve: Combines hot and cold water before automatic flow control.
  • Solenoid valve: Automatically opens and closes the mixed-water supply.
  • Electronic control box: Processes sensor signals and controls the automatic valve.
  • Solenoid cable: Connects the automatic valve to the controller.
  • AC adapter: Provides electrical power where AC operation is selected.
  • Battery enclosure: Provides battery power where the battery configuration is selected.
  • Power cable: Transfers power to the electronic controller.
  • Waterproof cable grommet: Protects electrical wiring at cabinet penetrations.
  • Angle stop valves: Provide independent hot- and cold-water isolation.
  • Service zone: Reserved area allowing component inspection, disconnection and replacement.

FontanaShowers Installation and Specification Resources

FS-1095GMG Product Page Product information and available technical documentation for the Fontana Brio PrimeSense™ Gun Metal Gray touchless bathroom faucet. FontanaShowers Installation Hub Central installation information covering deck-mounted touchless faucets, water connections, controls and commissioning. Under-Counter Equipment Coordination Review current model information before establishing final mixing valve, solenoid valve, controller and service-access locations. Touchless Bathroom Faucet Collection Explore related Fontana commercial touchless faucets and automatic washroom fixture configurations.

Professional Engineering and Accessibility References

Project verification: This under-counter component-layout resource is intended for architectural, plumbing, electrical, millwork and installation coordination and does not replace approved manufacturer instructions or project submittals. The architect, plumbing engineer, electrical engineer, millwork fabricator, licensed installer and facility manager should verify the faucet mounting stem, basin envelope, drain assembly, hot- and cold-water supplies, mixing valve, solenoid valve, control box, sensor cable, power configuration, waterproof cable penetrations, service-clearance zone, component removal paths and locally adopted plumbing and electrical requirements before final installation.