Aprilaire 800 - User Manual

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Model 800 Steam Humidifier

Owner’s Manual

Includes Safety & Operating Instructions

and Warranty Information

Steam Humidifier

Main Page

Other manuals for Aprilaire 800

Installation & Maintenance Instructions48 pages

Questions and Answers

L
Lauren AndersonOct 27, 2025
What to do if Aprilaire 800 Humidifier does not turn on?
- S
  Scott MillerOct 27, 2025
  If your Aprilaire Humidifier isn't turning on, the steam canister isn't heating, and the display lights are off, here's what to check: * **Power Supply:** Ensure the humidifier is receiving power from the main power supply and that the main line safety switch is on. Also, check the electrical connections at the terminal block. * **Low Voltage Control Circuit:** Verify that the control circuit is getting power, checking both the supply voltage and the terminal block connections. Confirm that there's a 24 VAC voltage in the control circuit. * **Control Terminals:** Make sure auxiliary limit controls, such as a high limit humidistat or airflow proving switch, are not preventing the system from operating. Reset, replace, or calibrate these as necessary. * **ADHC Faults:** Check the co...

Summary

Safety Cautions

CAUTION

Hot Surfaces and Hot Water

System contains extremely hot surfaces and water, posing burn risks.

Disconnect Electrical Power

Electrical power must be disconnected before servicing to prevent shock.

Electrical Shock Hazard

Risk of severe injury or death from electrical shock during maintenance.

Excessive Supply Water Pressure

High water pressure can cause the humidifier to overflow.

Sharp Edges

Be careful of sharp edges on ductwork and unit to avoid cuts.

Excess Humidity

Setting humidity too high can cause condensation and damage.

Introduction

Principles of Operation

Sequence of Operation

Installation Options and Effect of Water Characteristics

Operating Modes

Display Panel

Operating Instructions - Digital Humidifier Control

Digital Humidifier Control Indicator Lights

Explains the meaning of indicator lights on the digital control panel.

Blower Activation

Details how the humidifier control activates the HVAC blower for humidification.

Automatic Mode

Manual Mode

Test;Reset

Additional Information - Automatic Mode

Check the Humidifier Operation

Additional Information

Maintenance

Safe Shutdown and Draining

Instructions for safely powering down and draining the humidifier before servicing.

Regular Inspection Guidelines

Guidelines for regular inspection of the humidifier's components and connections.

To Replace the Canister

To Service Fill Valve

Limited Warranty