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either case, the Water Panel evaporator is usually changed once
a year. In the Models 448 and 445 Aprilaire Humidifiers, these
solids will build up on the evaporator surface, in the reservoir
and pump section. This is why proper maintenance is important
and necessary. Service hot water, 140° maximum, is recom-
mended with drain type units for increasing capacity and for
heat pump applications.
In the drain-equipped models, most of these solids are effec-
tively controlled by flushing them down the drain.
IV. ANNUAL MAINTENANCE
For best performance, we recommend that you replace the
water panel evaporator in your Aprilaire Humidifier annually.
• Call the installer of your Aprilaire Humidifier. This information is
often found on your equipment.
• Call your heating and air conditioning dealer.
• Use our “Dealer Locator” at: www.aprilaire.com
• Look in the Yellow Pages under Humidifying Apparatus
or Heating & Air Conditioner Contractors.
• If none of the above is successful and you still need
information, please feel free to write us.
V. ANNUAL SUMMER SHUTDOWN
For Models 220, 224, 440, 445, 448, 550, 558, 560, and 568
close the bypass damper if provided. For the Models 445 and
448, empty the reservoir.
AUTOMATIC HUMIDIFIER CONTROL:
Humidifiers controlled by the Automatic Humidifier Control
require no control adjustment. Shut off the water supply to the
humidifier by closing the saddle valve.
MANUAL HUMIDISTAT:
Humidifiers controlled by a manual humidistat, simply turn the
humidistat to the “Off” position. Shut off the water supply to the
humidifier by closing the saddle valve.