dampp-chasers Archives - Alex's Piano Service

Dampp-Chaser Installation in Yamaha HQ100

The Yamaha HQ100 is a so-called “gray-market” upright. A gray market piano is one that’s authentically manufactured by Yamaha, but is not intended for sale in a specific geographic region or country. Instead, it’s sold as “gray market” — a market that exists outside of the official distribution channels and is not authorized by the manufacturer. In this case, the HQ100 is the Japanese version of the Yamaha MX100II, with a few small modifications.

Like all Yamaha Disklavier uprights, Dampp-Chasers cannot be installed inside the cabinet. There isn’t any room. Instead, a backside system is installed between the support posts behind the piano. The back is then ensconced in a light fabric to keep the humidity-controlled air inside.

However, the HQ100 has one significant oddity: There are only two support posts. The double bucket system usually installed just doesn’t fit. So in this case, after communicating with Dampp-Chaser, I opted to install a full-size bucket on the rear of the system. A thin layer of foam or neoprene needs to be pasted to the sound-board side of the bucket, and a full-size baffle needs to be installed, but otherwise the system is installed like a typical back-side system. The dehumidifier brackets did require some bending to get them to fit properly.

For the Velcro, I used two feet of two inch wide Velcro, with the male side backed with a strip of neoprene. The picture is below:

Dampp-Chaser Long-Term Humidifier Supply

During the winter months, many clients leave the state of Maine. Their piano is left in Maine, which means there’s nobody to fill the Dampp-Chaser! This is a solution.

My best estimate is that this system can supply a Dampp-Chaser with sufficient water for three months during the winter, or perhaps longer. Normally, they have to be filled once a week!

There is no pump or water pressure: The two containers are self-leveling using nothing but physics. This means that, in effect, the interior tank has nearly the entire capacity of the external tank. The lack of electronic components remediates risk of severe failures. The external tank I use is the Barker 10-gallon tote.

Although not necessary for operation, an Arduino micro-controller is installed to monitor the water level and send updates using cellular data. This gives us confidence everything is working as it should, even during long absences. This is in development, although the source code I’m currently using is below. At present, I’m using the Botletics SIM7000 shield and an Arduino Uno Rev3. I connect using Telnyx.

The setup outside of a piano, with the Barker tote and the Dampp-Chaser universal tank connected by a hose. The universal tank will sit inside the piano, and the Barker tote will be outside.
This is the monitoring website for the above unit.

Source code for the Arduino monitor:

Cleaning FAQs

How do I clean my keys?

Carefully! My favorite key cleaning solution is Cory Key-Brite, which is available on Amazon. It can also be purchased at Starbird Piano in Portland or through me. Lacking this, the actual keytops can be cleaned with a damp cloth, provided that the cloth is well wrung out. You don’t want the keys to get wet, as the keys are very sensitive to moisture and will warp easily.

Another good product is MusicNomad’s Key One Cleaner, also available on Amazon. I use Cory Key-Brite when doing detail work, but Key One is also a suitable option if you’re wiping down your keys on a more regular basis. (With Cory you can expect to do a little more scrubbing, whereas Key One is thinner and behaves a bit more like Windex.)

If you are a regular customer of mine, please order these supplies through me. I can provide them at a lower price than Amazon.

How do I clean the rest of the piano?

Microfiber cloths dust off the outside of the piano effectively. If you have a high-gloss piano, it is worth investing in Cory Super Gloss Polish, which can also be purchased at Starbird Piano in Portland or through me. Cleaning underneath the strings and cast iron plate of a grand piano is an involved process, generally taking hours. This is a service I provide; however, if it is something you are interested in doing yourself, or you are located outside my service area, consider purchasing piano cleaning tools:

Spurlock Tool’s “Squeegee Type” Soundboard Cleaner is a very professional tool costing about $100, but will give you excellent and reliable results, without having to remove the lid of the piano. I especially recommend these tools if you have a venue or other location where cleaning is both important and routine.

Soundboard steels are inexpensive, but they are a labor-intensive option that will require removing the lid of the piano for convenient access. If you have patience, this is an inexpensive solution.

My piano smells awful! What can I do?

The folk remedy for piano odor, which I learned working on consignments at Starbird Music, is to put dryer sheets inside the piano. This is pretty effective for dealing with smoke odor, but as with any strong, offensive smell, it’s essential to find the source of the problem. Over the years, I’ve seen many pianos devastated by moths, mold, and mice. If you believe your piano has fallen victim to any of these, it needs a thorough and professional cleaning as soon as possible.

Often, in cases of serious mold, I will clean the piano out and then install a Dampp-Chaser dehumidifier system inside the piano to make sure the issue doesn’t return.

Recently, I’ve been tenting and ionizing pianos. In extreme cases, such as very moldy pianos in homes where residents have mold allergies, this can be a very effective technique. See “Can you clean out smoke, mold, and bad smells with an ozone generator?” below.

What can I do about mold?

Mold invades the felt and wood inside the piano, and it can be extremely difficult to remove in older pianos where it has been allowed to flourish. Newer pianos are generally chemically treated, and mold invasions tend to be much smaller in scale, although not always. In any size invasion, the entire piano needs to be professionally cleaned and treated, with the action and keys removed. If possible, the piano should be left disassembled and placed in direct sunlight for several days to kill the remaining mold.

When cleaning mold, I’ve found 12% hydrogen peroxide to be an optimal cleaner. I purchase 1-gallon containers of 12% peroxide. This peroxide is devastating to mold, but needs to be handled with gloves, safety glasses, and caution. In addition to being highly effective against mold, peroxide ultimately leaves behind nothing but oxygen.

(Please note that most studies I’ve seen imply that returns rapidly diminish after a 10% concentration, so purchasing higher concentrations of peroxide simply endangers the user without more effectively killing mold.)

If somebody has a mold allergy or the mold is particularly severe, I also recommend using an ozone generator. See “Can you clean out smoke, mold, and bad smells with an ozone generator?” below.

A dehumidification system must be installed directly inside the piano. You can either install an entire Dampp-Chaser® Piano Life Saver System, which both keeps the piano dehumidified and humidified when the weather is dry, or you can install their dehumidifier only system. The dehumidifier is all that’s necessary for controlling mold. These work really very well, and will (under all by that most extraordinary circumstances), keep the interior of the piano cabinet below 40% humidity. Most mold won’t grow well or germinate below about 80% humidity, and most of the data I’ve seen has implied all strains are effectively unable to germinate below 60%. This humidity control is absolutely mandatory for controlling mold from here on, even if we think we’ve killed basically all of it.

Finally, consider a humidity monitor. This is a tiny sensor installed inside the piano, which will operate on battery power, and will set off an alarm (in the form of an email or text message) if the relative humidity clears a certain threshold (such as 50%). You’ll get an immediate alert if there’s the potential for mold to grow inside the cabinet, and can correct it quickly. Most likely, this would happen if the dehumidifier were unplugged.

This device allows us to trust that the dehumidifier is operating as intended. This is important, since you can’t actually see or hear the device, people might accidentally unplug it, and so forth.

Can you clean out smoke, mold, and bad smells with an ozone generator?

In severe cases, I ionize the piano. Starting about a year ago, at the recommendation of a favorite eccentric customer, I made my first trial of ionizing a piano—or filling it with ozone gas. I tent the piano and place it with an industrial ionizer.

For this, I use an ozone generator that provides at least 10,000 mg/h of ozone (such as the Enerzen O-555).

Ozone is very harmful to organic substances, so it’s best not to overdo it. You want to make certain you use enough to kill the invading mold, but not so much that items in the household start degrading. In particular, plastic and rubber will off-gas rather unpleasantly. You may have to replace rubber components inside the piano (notably the pedal attachments) sooner after this treatment.

During the ionization process, all living things must leave the home. Even houseplants should ideally be moved away from the generator. Ozone gas is irritating to lungs. In terms of the chemical effects, it’s similar to breathing ultraviolet light (if somebody could do such a thing). However, as ozone reacts with biological substances, it degrades into oxygen, which is harmless. Once the ozone generator has finished its cycle, leave the house unoccupied for at least an equivalent period of time (six further hours if you ran it for six hours) with, ideally, the windows open.

Finally, consider a humidity monitor. This is a tiny sensor installed inside the piano, which will operate on battery power, and will set off an alarm (in the form of an email or text message) if the relative humidity clears a certain threshold (such as 50%). You’ll get an immediate alert if there’s the potential for mold to grow inside the cabinet, and can correct it quickly. Most likely, this would happen if the dehumidifier were unplugged.

This device allows us to trust that the dehumidifier is operating as intended. This is important, since you can’t actually see or hear the device, people might accidentally unplug it, and so forth.

What about mice?

Mice can do colossal damage, but seldom do in newer pianos because of their chemical mold treatments. In older pianos, if the colony nests inside the piano, the damage can be devastating.

The initial response is a total cleaning and an evaluation of the damage to moving parts. Additionally, mouse urine can cause warping, sticking keys, and mold. Once all visible evidence is removed and parts are replaced, there are two possible forms of prevention.

Treating the house for mice is ideal. However, this isn’t possible, the piano interior can be thoroughly scrubbed with a solution containing peppermint oil, and a saturated cloth left in the bottom. Another highly rated chemical repellent is Grandpa Gus’s Mouse Repellent. Any visible openings can then be covered with steel exclusion fabric.

Some customers use ultrasonic rodent repellent, but I have none of that I can recommend at this time. They do not seem to be effective as a long-term solution.

Can I polish the strings?

Sometimes, piano dealers polish the strings using 3M pads and steel wool. This can only be done to treble strings, not copper-wound bass strings, and will almost certainly throw the piano out of tune. If your strings are regularly breaking or are severely rusty, it might be worth considering having your piano restrung by a rebuilder.

Dampp-Chaser FAQs

Do Dampp-Chaser Piano Life Saver Systems help with tuning stability?

I always recommend maintaining stable humidity in the room the piano resides in, first and foremost. This is the best possible solution for the piano, although in Maine this can be challenging.

If controlling the humidity in the room is neither practical nor possible, then consider purchasing a Dampp-Chaser Piano Life Saver System. These systems can protect the most vulnerable parts of your piano and assist with tuning stability, even in unstable and extreme environments.

But I didn’t just take their word for it! I’ve installed remote humidity sensors in several pianos, and my finding has been that Dampp-Chasers do, in fact, keep the humidity inside pianos noticeably more stable. They’re particularly effective at keeping summer humidity under control, and are capable of bracing pianos against even the high humidity of a coastal Maine summer. The graph below depicts the performance of the system in a Vose & Sons baby grand piano located in a church:

The above piano has far more tuning stability than it did before, and the Dampp-Chaser will also protect against mold and corrosion. The piano in the above graph does have an undercover installed, and I nearly always recommend including these on grand installations.

This chart shows typical wintertime performance. The green line indicates outdoor humidity (not included in the first chart). As you can see, outdoor humidity varies tremendously during the Maine winter, and routinely reaches nearly 100%. The air, once heated, dries out considerably, and you can see this relationship represented by the blue line. Finally, the red line represents the humidity as measured at the piano itself, and you can see the Dampp-Chaser effectively smooths out the variation.

Do Dampp-Chaser Piano Life Saver Systems protect my piano from extreme humidity?

One of the largest benefits of a Dampp-Chaser system is that it protects several of the main structural components of your piano from the harshest extremes. During the winter months, in some evenings the relative humidity indoors can be as low as 10%. (I’ve measured as low as 5% in some customer’s houses.) This is close to the humidity the piano might experience in Death Valley during the summer. Conversely, Maine summers can see relative humidity clearing 80%. Both of these extremes can be absolutely devastating for soundboards, bridges, and other finely constructed wooden components and glue joints.

The dehumidifier also does a superb job keeping out condensation and mold. A dehumidifier only system (about a third the cost of the full system) can be installed in pianos susceptible to mold.

However, it’s important to mention that the Dampp-Chaser system does NOT protect the pinblock. Even though the Dampp-Chaser offers significant protection to much of the piano, the humidity of the room should always be controlled to the extent possible.

Does the piano have to be tuned after the Dampp-Chaser is installed?

Generally there will be some settling after the system is installed. The usually recommendation is to wait about two weeks for the piano to settle, and then tune it.

Often with my customers, I’ll recommend timing their Dampp-Chaser install for a few weeks before their next regularly scheduled tuning.

Do I need to do anything once it’s installed?

Your only obligation is filling the humidifier when it requires it. There’s a light installed on the piano that will flash when the system needs to be filled, and it comes with a special fill bucket.

Do they wear out?

There are no moving parts, so Dampp-Chaser systems generally last decades. Once every year or so, the humidifier will require a new set of paper wicks, and I provide these for free at regular tuneups.

Why do Dampp-Chaser system installation quotes vary so much?

The Dampp-Chaser is a retail product, sold through technicians. The technician acts as both the installer and the retailer. Aside from the initial price of the product and any delivery fees, the technician will add a retail markup and then add their installation fee, which might be flat rate or hourly. Different technicians handle this pricing structure very differently, and you’ll see Dampp-Chaser quotes ranging widely. The most important detail is that your installer understands the system conceptually, and has experience adapting it to many different pianos effectively. Every Dampp-Chaser installation is a little bit unique—some very—and your installer needs to be up to the task.