Aprilaire Operating Instructions, MODELS 350, 360, 400M, 500M, 600M & 700M, Operation Guide

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. If the Humidifier Control is
	already at the maximum setting of “7”, set
	the Blower Activation Switch to “ON”. The
	humidifier should be plumbed to hot water
	when using the Blower Activationfeature.
Humidifier does not operate.	Turn dial to “Test/Reset”. Make certain
(Solenoid does not “click”	HVAC blower is operating. If unit still does
when control is moved to	not operate, consult a heating contractor.
“Test/Reset” position.)
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. 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, 400M, 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 temperatureand reduce the setting accordingly to avoid excessive condensation, just as with the Digital Humidifier Control installed in Manual Mode (see page 6).

To determine the indoorRH,slowly turn theknobclockwiseandcounterclockwise and listen for 2 clicks. The indoor RH is within the range of the 2 clicks.

CHECK THE HUMIDIFIER OPERATION

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 fan must be running 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. (Model 400 and 400M: Floats must be down for the solenoid valve to allow water flow.) 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. Return control knob to desired setting.

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