Aprilaire 4655 - User Manual

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Safety And Installation Instructions24 pages

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Summary

Your Humidifier

Digital Humidifier Control Indicator Lights

Indicator lights for dealer service, water panel replacement, and normal operation.

Operating Instructions

Blower Activation

How to enable HVAC fan for maximum humidification or operate when fan is running.

Automatic Digital Humidifier Control

Automatic Mode

Steps for initial setup and adjustment of the automatic digital humidifier control.

Manual Mode

Outdoor Temperature Adjustment

Adjusting manual control settings based on outdoor temperature to prevent condensation.

Water Panel Change Indicator

Resetting the Indicator

How to reset the yellow 'Change Water Panel' light after replacement.

Test;Reset Function

Checking Humidifier Operation

Using Test/Reset to check humidifier operation and reset the water panel timer.

Additional Information

Humidity Control Automation

How the control automatically adjusts humidity based on outdoor temperature changes.

Annual Summer Shutdown

Procedure

Steps to properly shut down the humidifier for the summer season.

Summary

Your Humidifier

Digital Humidifier Control Indicator Lights

Indicator lights for dealer service, water panel replacement, and normal operation.

Operating Instructions

Blower Activation

How to enable HVAC fan for maximum humidification or operate when fan is running.

Automatic Digital Humidifier Control

Automatic Mode

Steps for initial setup and adjustment of the automatic digital humidifier control.

Manual Mode

Outdoor Temperature Adjustment

Adjusting manual control settings based on outdoor temperature to prevent condensation.

Water Panel Change Indicator

Resetting the Indicator

How to reset the yellow 'Change Water Panel' light after replacement.

Test;Reset Function

Checking Humidifier Operation

Using Test/Reset to check humidifier operation and reset the water panel timer.

Additional Information

Humidity Control Automation

How the control automatically adjusts humidity based on outdoor temperature changes.

Annual Summer Shutdown

Procedure

Steps to properly shut down the humidifier for the summer season.

The Aprilaire Automatic Digital and Manual Humidifier Control (Models 60, 62 & 4655) is designed to regulate the humidity levels in your home, working in conjunction with your heating, ventilating, and air conditioning (HVAC) equipment. This control system offers both automatic and manual modes of operation, providing flexibility and precision in maintaining optimal indoor humidity.

Function Description:

The primary function of the Aprilaire Humidifier Control is to manage the operation of your humidifier to achieve desired indoor relative humidity (RH) levels.

In Automatic Mode, the Digital Humidifier Control senses both indoor humidity and outdoor temperature. It then automatically adjusts the humidifier's operation to provide the optimum humidity level, protecting your home and furnishings from the damaging effects of excessive condensation or low humidity during the heating season. This mode eliminates the need for manual adjustments when outdoor temperatures change and removes the necessity to turn the dial setting to "OFF" during the summer. The digital readout on the automatic control displays the humidity level inside the cold air return duct, which accurately reflects the humidity in the living space when the HVAC blower is operating. For every 2°F change in outdoor temperature, the Digital Humidifier Control automatically adjusts the indoor RH by 1%. The control is designed to maintain a maximum indoor humidity of 45%.

In Manual Mode, the control allows you to set the desired humidity level manually. This mode requires you to anticipate drops in outdoor temperature and reduce the setting accordingly to avoid excessive condensation. The manual control is installed either in the cold air return duct or on an interior wall.

Blower Activation:

The "Blower Activation Switch" allows the humidifier control to activate the HVAC fan for maximum humidification. When set to "ON," if the HVAC system has been idle for one hour, the humidifier control will activate the HVAC system fan to sample the air for 3 minutes. If the RH is lower than the set point, the humidifier control will activate the humidifier and keep the fan running. The humidifier will continue to operate for 2 hours or until the humidification set point is reached. If the RH set point has not been reached by the end of a call for heat, the control will continue to operate the humidifier and the HVAC fan until the humidification set point is reached or 2 hours have elapsed. For Models 500, 600, and 700, this setting requires connection to hot water. When the "Blower Activation Switch" is in the "OFF" position, the humidifier control will only operate the humidifier if humidity is required and the HVAC system fan is operating or the HVAC system is producing heat. Note that if used with an Aprilaire 8570 Communicating Thermostat and blower activation is desired, the A B communication terminals should not be wired.

Important Technical Specifications:

Humidity Range (Automatic Mode): Automatically adjusts indoor RH based on outdoor temperature, with a maximum controlled humidity of 45%.
Humidity Range (Manual Mode): Settings are provided for various outdoor temperatures, with recommended RH levels ranging from 15% at -20°F to 45% at +40°F.
Control Type: Automatic Digital Humidifier Control (Models 60, 62 & 4655) or Manual Humidifier Control.
Installation: Typically installed in the cold air return duct or on an interior wall.

Usage Features:

Digital Humidifier Control Indicator Lights:
- Call Dealer for Service (Red Light): Indicates abnormal humidifier operation requiring service.
- Change Water Panel (Yellow Light): (Model 60 only) Indicates it's time to replace the humidifier's Water Panel.
- Humidifier On (Green Light): Indicates normal humidifier operation.
First Heating Season Setup (Automatic Mode): Initially, turn the dial setting knob to "5." Over the next 24-48 hours, minor adjustments may be needed for personal comfort. During the coldest part of the season, further minor adjustments might be necessary depending on home construction. Once set, it typically won't require further adjustment in future heating seasons.
Test/Reset Feature: Allows checking humidifier operation even without a call for humidity. Turning the control knob to "Test/Reset" will operate the humidifier for one minute (in test mode) and reset the "Change Water Panel" timer. In Digital Humidifier Control, if the knob is left in "Test/Reset" for more than 1 minute, the display will flash the software revision level.
Annual Summer Shutdown:
- For Digital Humidifier Control in Automatic Mode with Blower Activation switch "OFF," no adjustment is necessary.
- For Digital Humidifier Control in Automatic Mode with Blower Activation switch "ON," set the knob to "OFF."
- For Digital Humidifier Control in Manual Mode, set the knob to "OFF."
- For Manual Humidifier Control, set the knob to "OFF."
Condensation Management: The control helps prevent condensation on windows by automatically adjusting humidity levels. If condensation occurs, the setting should be reduced by one increment.
Lack of Humidity: If humidity is insufficient, increase the setting by one increment. If already at maximum ("7"), set the Blower Activation Switch to "ON" (requires hot water connection for Models 500, 600, 700).

Maintenance Features:

Water Panel Change Indicator (Model 60 Only): The control tracks humidifier operation time, and the yellow "Change Water Panel" light flashes when a preset amount of running time has elapsed. This interval is determined by the installer based on the humidifier model and water hardness.
Resetting Water Panel Timer: After replacing the Water Panel, turn the Control knob to the "Test/Reset" position until the green "Humidifier ON" light flashes to reset the timer.
Troubleshooting (Table 3 - Operation Guide): Provides solutions for common issues such as condensation on windows, lack of humidity, humidifier not operating, humidifier not shutting off, and error codes (E1, E2, E3, E4). For error codes, it recommends calling your heating and air conditioning dealer.