Aprilaire 400 Troubleshooting Guide download pdf (Page 3)

STEP 2: Disassemble the Humidifier Control

Remove the knob. Remove the cover by pulling at the bottom and

swinging it out and upward.

STEP 3: Check the Change Water Panel Indicator Setting

This setting will control when the indicator light turns on,

reminding you to change your water panel. If your Control came

with a humidifier, the Control is pre-set for the humidifier. If the

installation site has a 3-month or shorter heating season or very

hard water, you may want to adjust the setting (see Figure B).

The Model 62 shipped with the Model 800 Steam Humidifier is

factory set to “OFF”. The Model 62 does not have the “Change

Water Panel” light on the Control. The Canister Change indicator

for the Model 800 is on the humidifier.

Use the “OFF” setting for Model 800

Series humidifiers.

Use Setting “A”

for Model 400 Series

humidifiers in areas

with very hard water.

The indicator will light

after 150 hours of

humidifier operation.

Use Setting “B”

for Model 400 Series,

and for 500 Series, 600

Series and 700 Series

humidifiers in areas

with very hard water.

The indicator will light

after 300 hours of

humidifier operation.

Use Setting “C” for Model 500 Series,

600 Series and 700 Series humidifiers.

The indicator will light after 600 hours of

humidifier operation.

Figure B

Water Panel

Indicator

Settings

90-1202B

INSTALLATION

STEP 1: Unpack the Humidifier Control Carton

Make sure all components are present (see Figure A):

A. Humidifier Control

B. Outdoor Temperature Sensor

C. Manual Mode Label

Figure A

90-1201B

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Aprilaire 400 Troubleshooting Guide Page 3

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