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Greetings: I am a little obsessive about tuning and, accordingly, keeping my Dampp-Chaser functioning properly. It's quite warm and humid where we are at the present, and the yellow light has blinked roughly every three weeks or so in the last month and a half.

The last time it did so, and I filled it, was about a week ago. We leave soon for several weeks' vacation, and I'm quite sure it will want to be filled while we are away. I have a friend/colleague who can pop in about once a week and check on it, but I'm concerned it may sit dry for several days before he can get to it.

I read somewhere that when the yellow light comes on, the tank is still about 25% full. Is that true? And would it be a terrible idea to "top it up" with a little water before we leave town, even if the light isn't blinking?

These are surely first world problems ... But thank you for any advice.


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And another more theoretical question: the humidity in the piano room has averaged between 50-60% over the last month. Why is the D-C system using any water at all, as it seems to be only de-humidifying?


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To answer your second question first... The system switches between one humidifying and dehumidifying. It never "coasts" or has both sides off.

To really fill the unit, slowly fill as the yellow light is blinking just until the yellow light stops blinking. At this point, you can fill your watering can to the line and use that much water to fill the unit. In many situations, the light has been blinking a long time before filling, so the tank really never gets filled. Honestly, it doesn't sound like that happens with you!

When the light blinks, there is still water in the unit, so it isn't running dry. If your room is consistently humid, running dry really won't dry out the piano if you have the smart heater bar.

You could "top off" even higher, but that risks spilling.

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During warm humid weather, I do not fill the tanks of the Damppchasers. On the units that do not have a smart bar, the humidifier heater bar needs to be unplugged. It’s important to leave the rest of the system plugged in, so that the dehumidifier bars can do their work. When the humidifier pads dry, they will harden so it is important to put new pads in before you refill the tank as the heating season approaches.


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So if you've never done this to check water level in the humidifier, while crouching close to underside of piano put your fingers over the rim of the humidifier and feel inside how far down you can go before you touch water level, then carefully add more water checking regularly , stop when water level is about one inch and a half from the top.
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Many, many thanks for the helpful and informative replies!


Yamaha S4

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