Operating Instructions | Aprilaire 700A, 700M, 500M, 600A, 600M, 400A

TABLE 3 – Operation Guide

Condition	Solution
Condensation on windows.	Reduce the setting on the control dial by
	1 increment.

Lack of humidity.	Increase the setting on the control dial by
	1 increment.

Humidifier does not operate.	Turn dial to “Test/Reset”. Make certain
(Solenoid does not “click”	HVAC blower is operating and HVAC is
when control is moved to	calling for heat. If unit still does not
“Test/Reset” position.)	operate, consult a heating contractor.

Humidifier won’t shut off.	Turn dial to “Off”. If unit continues to
	operate, consult a heating contractor.

Test mode.	System operation is checked by setting
	the knob to “Test/Reset”. Make certain
	HVAC blower is operating and HVAC is
	calling for heat. Humidifier will operate
	for one minute. NOTE: Placing the knob
	in “Test/Reset” resets the Water Panel
	change timer.

Red “Call Dealer for Service”	Note the error code on the display (E1, E2,
light flashes (Figure A).	E3 or E4) and call your heating and air
	conditioning dealer.

Yellow “Change Water Panel”	Refer to the Annual Maintenance section
light flashes (Figure A).	(page 11) for instructions on changing
	the Water Panel or call your heating and
	air conditioning dealer for service. After
	the Water Panel is replaced, turn the
	Control knob to the “Test/Reset”
	position until the green “Humidifier On”
	light flashes, to reset the Water Panel
	change timer.

OPERATING INSTRUCTIONS –

MODELS 350, 360, 500M, 600M & 700M

FIGURE C – Manual Humidifier Control

90-1237

Your Aprilaire humidifier is controlled by a Manual Humidifier Control (see Figure C). The Manual Humidifier Control is installed either in the cold air return duct or on an interior wall of the home. With the Manual Humidifier Control, it is important to anticipate a drop in outdoor temperature and reduce the setting accordingly to avoid excessive condensation, just as with the Automatic Digital Humidifier Control installed in Manual Mode (see page 6).

To determine the indoor RH, slowly turn the knob clockwise and counterclockwise and listen for 2 clicks. The indoor RH is within the range of the 2 clicks.

CHECK THE HUMIDIFIER OPERATION

AUTOMATIC DIGITAL HUMIDIFIER CONTROL

Set the knob to “Test/Reset”, make sure that the water saddle valve is open and that there is electricity to the humidifier. The HVAC system must be operating for the humidifier to function. Note: Turning the knob to “Test/Reset” resets the “Change Water Panel” timer. The humidifier will only operate for 1 minute in test mode. Reduce the Humidifier Control setting to the recommended inside RH, depending on the outside temperature. DO NOT LEAVE IN TEST MODE AS HUMIDIFIER WILL

NOT OPERATE.

MANUAL HUMIDIFIER CONTROL

Set the knob to the highest setting, make sure that the water saddle valve is open and that there is electricity to the humidifier. The HVAC system must be operating for the humidifier to function. Confirm that the solenoid valve is energized and water is flowing into the humidifier (Model 400A: Floats must be down for the solenoid valve to allow water flow).

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700A, 500A, 600A, 500M, 700M specifications

Aprilaire is a leading brand in the field of indoor air quality, and its series of humidifiers like the 600A, 700M, 400A, 500A, and 600M have been designed for optimal performance and user convenience. These humidifiers are engineered to maintain ideal moisture levels in your home, which is especially important during dry winter months.

The Aprilaire 600A is an advanced model equipped with automatic humidity control. This feature enables the humidifier to adjust moisture levels based on the outdoor temperature, ensuring a comfortable indoor environment throughout the changing seasons. The 600A is also easy to install and integrates seamlessly with your home’s HVAC system, supplying humidity throughout the entire house.

In contrast, the 700M is a manual humidifier option that offers flexibility in controlling humidity levels. This model is particularly suitable for homeowners who prefer a hands-on approach. The 700M can deliver up to 0.75 gallons of moisture per hour, making it effective for larger homes or spaces where humidity needs to be closely monitored.

The Aprilaire 400A and 500A models are geared towards versatility and space efficiency. The 400A, designed for homes with lower humidity requirements, operates quietly and offers a less invasive installation. It is suitable for areas up to 4,000 square feet, making it ideal for many average-sized homes. The 500A, on the other hand, is particularly designed for homes with a higher demand for moisture, providing consistent humidity control for larger spaces.

The Aprilaire 600M is another manual option that combines a straightforward user interface with robust performance. Similar to the 700M, it allows users to manually adjust humidity levels but features a slightly superior output rate.

One of the standout characteristics shared among these models is their ability to minimize the effects of dry air. By maintaining the right humidity levels, these humidifiers help reduce the likelihood of respiratory issues, dry skin, and static electricity, along with protecting wooden furniture and flooring from damage.

Overall, the selection of Aprilaire humidifiers offers something for every homeowner, from automated models that take the guesswork out of humidity control to manual options that provide a personal touch. Each model boasts its unique features while ensuring a healthier and more comfortable living environment year-round.