Toto spares, Toto parts, Toto spare parts, Spare code no : TN78-9V900-eco powered DC Control unit, ere’s what I found out about TOTO TN78‑9V900 (Eco Powered DC Control Unit) — its use, features and role — and what is still unclear / needs confirmation.
What TN78‑9V900 is / what it is used for
From the information available, TN78‑9V900 is a self‑powered / Eco‑powered DC control (sensor) unit used in touchless / automatic faucets (lavatory taps) by TOTO.
Key usage / function roles:
- It is paired with TOTO automatic / sensor faucets (cold water) to detect hands and control water flow.
- It uses a self‑generated power / energy harvesting mechanism (sometimes called “Eco‑power”) so that the sensor and valve mechanism do not rely solely on external batteries or direct electrical supply.
- It is designed to consume very low power: in idle or sensing mode it may consume ~0.4 W; under active operation ~0.6 W (as per some listings).
- It works under a water pressure range, typical for sensor taps: ~0.05 MPa to 0.75 MPa (i.e. 0.5 to 7.5 bar or similar) in various market specs.
- It is used in TOTO’s cold‑water sensor faucet models, e.g. models TEN12ANV900 / TEN40ANV900 + TN78‑9V900 etc.
- The control unit may integrate or interface with a sensor, a micro controller / detection circuit, and a solenoid or valve actuator to open / shut the faucet. The self‑powered unit likely harvests energy from the water flow (micro turbine or generator) or via small internal mechanism, storing small amounts for the sensor/valve actuation (this is what “Eco‑power / self‑power” generally suggests).
So, in summary: TN78‑9V900 is the control / sensing / actuator module used in TOTO's self‑powered automatic faucet systems, particularly in cold‑water sensor faucets, enabling hands‑free operation while minimizing power use / wiring.
Available Specifications from Listings
From product listings:
- Power consumption: ~0.4 W idle, ~0.6 W when active.
- Operable water pressure: 0.05 MPa ~ 0.75 MPa.
- Water flow / usage: for the faucet system, typically ~2 L/min (for the faucet that uses the TN78‑9V900) in cold‑only sensor models.
- Sensor distance / range (listing for paired faucet): ~12–18 cm.
- Temperature / water condition: used for cold water line (i.e. not hot) in many models.
- Warranty / other details: often sold with 2 years warranty (for the faucet + sensor assembly) in listings.
Role / Benefits
The use of a self‑powered / Eco‑powered DC control unit has some advantages:
- No external power wiring
- Because it generates power from the water flow (or partial flow), it reduces or eliminates the need for external wiring or frequent battery replacement. This is crucial for sanitary / hygiene installations, especially in public restrooms.
- Energy efficiency
- The control only activates when needed, and the harvested energy is used efficiently to power sensing and actuation, minimizing waste.
- Automatic, touchless operation
- It enables hands‑free faucet operation, which is more hygienic and reduces water wastage (because the flow stops when the hands are removed).
- Compact / integrated design
- The control unit can be integrated or mounted close to the faucet body, simplifying installation and maintenance.
What Is Not Clearly Known / Needs Confirmation
While many features are inferred or from secondary listings, the following details are not clearly confirmed from authoritative TOTO documentation (at least from my search so far):
- Exact electrical / energy harvesting design (e.g. how much flow is needed to power the sensor, capacitor / storage in the control, startup threshold, etc.)
- Exact interface / signals (e.g. type of sensor (infrared, capacitive), control logic, whether the unit has fail-safe / manual override)
- Physical dimensions, wiring / connection terminals / ports
- Whether the unit supports both cold and hot water lines (but in listings, mostly for cold only)
- Approved certifications, temperature limits, etc.
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