Toto spares, Toto parts, Toto spare parts, Spare code no : DH2019#PFG - thermostatic konb,
A “thermostatic knob” (or control handle) generally serves one of these functions in plumbing/bath fixtures:
- It controls a thermostatic mixer valve: a valve that mixes hot and cold water and maintains a constant outlet temperature regardless of inlet pressure/temperature fluctuations.
- The knob is the user interface for setting the desired temperature.
- It may also serve as the on/off control or flow‑control (volume) control in some systems, especially in baths/showers where “push/turn” handles are used.
For example, with the GROHE Grohtherm SmartControl Dual Function Thermostatic Valve, the knob is used to push for on/off and turn for volume adjustment, while a separate lever sets the temperature. Grohe
In many thermostatic valves the knob might set temperature and/or flow, depending on the design.
📝 Typical Usage Instructions
Since I don’t have the exact manual, here’s how you would generally use such a knob:
- Turn on the water: Usually pushing the knob (or turning it from “off” position) allows water flow.
- Adjust flow/volume: Turning the knob (often clockwise or counter‑clockwise) increases or decreases flow (depending on design).
- Set temperature: Some knobs include temperature markings (or a separate handle) which you rotate to select your desired temperature.
- Safety stops / maximum temperature: Many thermostatic mixers include a “safe stop” at a given temperature to prevent scalding (for example 38 °C) which you must push past or deliberately override. Grohe
- +1
- Maintaining constant temperature: Once set, the internal thermostat element adjusts the mix of hot/cold so the output remains at the set temperature despite changes in input conditions.
⚙️ What to check / some tips
- Ensure the knob is firmly mounted and correctly aligned; many knobs have indexing/stops.
- Look for temperature markings (degrees Celsius) or icons (snowflake for cold / flame for hot) on the knob.
- If water temperature changes suddenly when another tap opens, the thermostatic valve may need servicing (clean filters, check hot/cold supply balance).
- If there’s a safe‑stop button (common in thermostatic mixers) you might need to press or pull it to go above a safe max temp.
- If the knob is hard to turn or stuck, there might be scale build‑up, worn gasket, or cartridge issue.
- When replacing a knob / handle, ensure it is compatible with the valve spindle size and fit‑in design of the mixer body.
❓ Specific for “DH2019#PFG”
Since the exact part number isn’t clearly documented in online publicly accessible manuals:
- It’s likely the knob component (handle) of a thermostatic mixer from TOTO or one of its accessory lines.
- The suffix
#PFGmight refer to the finish (for example PFG = polished finish gold? or a colour code) or packaging code. - If you need the diagram or parts list, I’d recommend contacting TOTO’s service/spares centre in your region with the mixer model number (not just the knob) and ask for the exploded parts sheet.
- When replacing you’ll want to verify the spindle diameter, the reset‑position, and whether the knob includes any decorative trim or cover plate.
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