I have a model 760 humidifier and have maintianed it over the years. Now the water leaks around the casing after several hours of use (No leak after 2 hrs., though). What could be wrong?

Tuesday, March 1, 2011 by Aprilaire Team
Consumer question:

I have a model 760 humidifier and have maintianed it over the years. Now the water leaks around the casing after several hours of use (No leak after 2 hrs., though). What could be wrong?

Aprilaires' response:

Thank you for contacting us with regards to your model 760 Humidifier. Here are the things to check when troubleshooting a power humidifier, which is leaking:

1.    Position Of Unit On Plenum
•    Is the unit level (let to right)?
•    Is it plumb (front to back)?
2.    Feed Tube
•    Is the Feed Tube tightened or is there a crack in the tube?
3.    Position Of Scale control insert-
•    Is the base of the scale control insert sitting firmly in the drain spud at the base of the housing?
•    Does the bottom of the scale control insert have a taper to it to direct water to the drain spud?
•    Is the Scale control insert positioned correctly? The scale control insert has a front and a back.  The back of the water distribution tray has an indentation in it to allow for clearance of the nozzle, which is attached to the top of the base.  If reversed, and forced into place, the water distribution tray will break off the nozzle attached to the water feed tube and potentially the housing, causing water to leak
4.    Water Panel Assembly-
•    Are there aluminum strands hanging out of the scale control insert?
•    Is there a gap between the top of the water panel and the water distribution tray for air to go through?
•    Is the colored dot on the water panel, up?
•    Is there a consistent coating on the Water panel, or are there shinny spots or clumps of coating?
5.    Water Entrainment (Water Blowing out of the Humidifier)-
•    Are there signs of entrainment? Mineral build-up on fan blade, shroud, inside of cover?
•    Is the static pressure in the plenum over .4”w.c.?  If so, entrainment and leaking could occur.
6.    Missing Orifice
•    If there is no orifice in the unit, the water entering the system could flood the panel.  To check for proper water flow, a quart jar should fill at the drain line in about 2 ½ minutes for a red or blue orifice, 5 minutes for a white or yellow orifice.
7.    Drain line-
•    Is the drain line plugged? 
•    Does it have a good downward slope?
•    Is it “tee’d” with any other drain lines?
8.    Distribution Tray
•    Is the granular coating missing entirely or in places? 
•    Are there water stains on the underside of the tray between the holes and the edge?
•    Is it brittle or cracked in places?
Your or your installer can check for these possible sources of water leaking.
We appreciate the opportunity to be of assistance

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