Terry, Sorry for the delay for this reply. Did you install a 48-50A with the system? How close is the humidistat to the tank? It would help to have a backside cover (mylar back) with the top holes covered. I have also had great success installing a 24-24 (24" 25 watt) Dampp-Chaser to the far left bottom corner inside a vertical. This developes warm air rising past the tenor section of the soundboard and bridge when dehumidification is called for. If any techs out there have backside covers installed, close the TOP holes with tape per Dampp-Chasers newest recommendation. Controlled air stays in longer. Thanks, Steve Cunningham, RPT Piano Climate Control Supply Dampp-Chaser Distributor Protek Lubricants, etc. 1-800-443-7509
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