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TABLE OF CONTENTS
Warnings ..........................1
Materials List ...................... 2
Principles of Operation.............. 2
Duct Sensor ....................... 3
Temperature Compensation .......... 3
Blower Activation .................. 3
Installation......................... 4
Determine Location for Control........ 4
Determine Location for Duct Sensor ... 5
Determine Location for
Temperature Sensor ................ 6
Wiring Diagrams ................... 7
Terminal Descriptions ............... 7
Jumper Settings ................... 7
Diagrams ......................... 8
Set Up ............................ 11
Program Mode .................... 12
Operating Mode ................... 18
Technical Data .................... 20
ADMC .......................... 20
Duct Sensor ...................... 21
PRINCIPLES OF OPERATION
The Aprilaire
®
Automatic Digital Modulating Control (ADMC) is designed to be mounted on a
wall in the living space. The ADMC provides precise humidity control by providing a variable
output to the humidifier based on the difference between the user set point and the sensed
humidity. See Figure 1. The proportional band default setting is 5% RH and can be varied from
2% to 10% RH in increments of 0.5%. Adjust the proportional band based on the humidity
control needs of the living space.
DUCT SENSOR (MODEL 801 ONLY)
The Aprilaire ADMC package comes with a duct sensor that can be installed in the return
duct to be used as the control sensor or installed in either the return or supply duct to be used
as a high limit duct humidity sensor. If duct sensor is used as a high limit sensor, it must be
installed at least 4 feet downstream of the steam dispersion tube. See the Set Up section for
configuration details.
TEMPERATURE COMPENSATION
BLOWER ACTIVATION (MODEL 801 ONLY)
The automatic mode is the preferred method of installation to help prevent condensation on
windows. When installed in this mode, the ADMC utilizes an Outdoor Temperature Sensor to
measure outdoor temperature. The ADMC then automatically adjust the desired indoor RH.
See Table 1 for temperature and RH values.
TABLE 1 – ADMC Maximum Set Point for Outdoor Temperature
Outdoor Temperature °F (°C) Maximum Setpoint (%RH)
20 (-7) 35%
10 (-12) 30%
0 (-18) 25%
-10 (-23) 20%
-20 (-29) 15%
When an Outdoor Temperature Sensor cannot be installed or the application requires a
specific RH set point, the ADMC can be configured to manual mode. In this configuration, the
humidifier and control will maintain a constant RH, regardless of outdoor temperature.
NOTE: If the building is not designed to handle the amount of RH the humidifier is supplying,
the occupants may need to adjust the RH setting on the ADMC to a lower value during
extremely cold days to prevent condensation on interior surfaces.
The Aprilaire Blower Activation Relay is provided with ADMC to energize the HVAC system
blower when there is a call for humidity. See Figure 4 on page 8 for wiring to the ADMC and
HVAC system.
MATERIALS LIST
MODEL 63
Automatic Digital Modulating Control
Duct sensor
Outdoor Temperature Sensor
Blower activation relay
MODEL 5558
Automatic Digital Modulating Humidistat
Outdoor Temperature Sensor
-2% -5% -10%
20%
100%
HUMIDIFIER OFF
PROPORTIONAL BAND
RH DIFFERENCE FROM SETPOINT (%)
HUMIDIFIER OUTPUT (%)
2% PROPORTIONAL
BAND SETTING
5% PROPORTIONAL BAND SETTING (DEFAULT)
10% PROPORTIONAL BAND SETTING
90-2008
FIGURE 1 – Humidifier Output for ADMC Signal
32
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