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VI. ANNUAL MAINTENANCE
VII. ANNUAL SUMMER SHUTDOWN
For best performance, we recommend that you replace the Water Panel
evaporator in your Aprilaire Humidifier annually with the exception of
Model 400 which should be changed twice a season. If you have a
Humidifier Control equipped with a water panel timer, the “Change Water Panel”
light will be lit (during operation only) when it is time to change your Water Panel.
To purchase a new Water Panel:
• 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.
• Purchase only Genuine Aprilaire Water Panels to maintain performance.
After replacing the Water Panel, turn the control knob to the “Test/Reset” position
until the “Change Water Panel” light blinks to reset the water panel change
indicator timer. (Blower must be operating and furnace calling for heat.) Be sure to
turn the control knob back to the normal setting after resetting the timer.
1. For Models 400, and 600 close the bypass damper which is a part of the
unit, with the use of the small damper handle. For the Model 550, close
the bypass damper which is installed in the bypass pipe.
2. Shut off the water supply to the humidifier by closing the saddle valve.
Humidifier Control:
There is no adjustment to the Humidifier Control required for summer
shutdown. (Applies to both Automatic and Manual Mode.)
Service hot water, 140° maximum, is recommended with drain type units for
increasing capacity and for heat pump applications.