Aprilaire 800 owner manual Operating Instructions digital humidifier control, Icon Function, Light

TABLE 1 – Display Panel (continued)

Icon Function

	Drain valve indicator.
	Solid green to indicate start of drain cycle..
	Drain cycle occurs:
	1) To maintain nominal steam output during normal
	operation..
	2) During end of season shut down. (End of season shut
	down occurs after 72 hours of inactivity.)
	3) If humidifier has operated for 168 hours without a drain
Light	cycle..
	4) When humidifier is turned off.
	Flashes green (along with fill light) indicating drain and fill
	valves are pulsing to dislodge mineral deposits.
	Flashes green when humidifier is turned off indicating
	canister is draining. When flashing stops, main power
	disconnect can be turned off and front panel can be opened.
	Indicates canister needs to be replaced or humidifier
	requires other type of service.
	Flashes red when canister can no longer supply demand
	and needs to be replaced because electrodes have been
	corroded or coated with mineral deposits. Humidifier may
	continue to generate steam but at a reduced capacity.
	Flashes red if humidifier with new canister cannot generate
Light	steam due to insufficient water conductivity after 96 hours of
	drain/fill activity. Approximately 1/10 teaspoon of table salt
	can be added to fill cup to increase conductivity of water.
	Solid red if controller detects over-current between
	electrodes. Causes may include electrodes coated with
	mineral deposits, blocked drain, or defect in drain valve
	circuit. See Troubleshooting Guide.

OPERATING INSTRUCTIONS – digital humidifier control

The Digital Humidifier Control offers two modes of operation, Automatic or Manual. An explanation of both modes follows. (See Figure 2 on page 10 for Automatic Mode. See Figure 3 on page 11 for Manual Mode.)

When in the Automatic Mode, this system offers the following benefits:

•You will receive the optimum amount of humidity so that your home and its furnishings are protected from the damaging effects of excess condensation or low humidity during the heating season. The Control automatically adjusts your home’s humidity based on the outdoor temperature, increasing the time maximum comfort is maintained..

•Simple operation with few adjustments. In the Automatic Mode, the Control eliminates the need to manually adjust the control when outdoor temperature changes. It also eliminates the need to turn the dial setting to “OFF” during the summer season.

Digital Humidifier Control Indicator Lights

Call Dealer for Service: The red light indicates that the humidifier is not operating normally and that service is required.

Humidifier On: The green light indicates that the humidifier is operating normally..

Blower Activation

Set the Blower Activation Switch to “ON” to allow the Humidifier Control to activate the furnace fan for additional humidification. Refer to TABLE 4 – Operation Guide. This may be required if the humidifier is mounted on a heat pump or a furnace with short run cycles.

When the Blower Activation switch is “ON”, the Humidifier Control will turn on the HVAC blower when humidity is required. In the “OFF” position, the humidifier will only operate if humidity is required and the HVAC system is operating..

When the Blower Activation switch is “ON”, the Humidifier Control may periodically turn the HVAC blower on to sample the humidity of the air.

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