Aprilaire 400 Troubleshooting Guide download pdf (Page 2)

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 4

System Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 18

Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 20

TABLE OF CONTENTS

WARNING

1. 120/240 volts may cause serious injury from

electrical shock. Disconnect electrical power to the

furnace and humidifier before starting installation.

2. Sharp edges may cause serious injury from cuts.

Use care when cutting plenum openings and

handling ductwork.

CAUTION

1. Do not set humidifier higher than recommended.

Condensation damage may result.

2. Do not set humidity up to recommended levels if

there is condensation on the inside of windows of

any unheated living space. Condensation damage

may result.

3. Do not mount the Humidifier Control on the supply

plenum or duct. The unit cannot withstand the

plenum temperatures and will malfunction.

4. When installing the Humidifier Control on a

counterflow furnace, ensure the blower continues to

run after the heat call is satisfied to eliminate high

temperatures from damaging the Humidifier Control.

5. Do not mount the Humidifier Control downstream of

the bypass outlet. False humidity conditions will

cause the humidifier to operate incorrectly.

6. Avoid installing the Humidifier Control with the

display facing downward to prevent the Humidifier

Control from incorrectly measuring the relative

humidity (RH) in the duct.

THESE INSTALLATION INSTRUCTIONS

ARE FOR THE APRILAIRE

AUTOMATIC DIGITAL

HUMIDIFIER CONTROL ONLY!

For Aprilaire

humidifier installation,

follow Aprilaire Humidifier Installation Instructions.

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Aprilaire 400 Troubleshooting Guide Page 2