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Aprilaire 1150 - User Manual

Aprilaire 1150
48 pages
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Steam Humidifier
Models 1150, 1160, and 1180
Installation, Operation, and Maintenance Manual
Humidifier
READ AND SAVE THESE INSTRUCTIONS

Table of Contents

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Questions and Answers

  • C
    cindy12Aug 20, 2025
    Why is my Aprilaire Humidifier not filling with water?
    • S
      Samantha CarpenterAug 20, 2025
      If your Aprilaire Humidifier is not filling with water, first ensure the manual water supply valve is open and has pressure. Check for any blockages in the water supply line strainer and ensure the fill valve electrical plug is fully engaged. Verify that the unit control is on by pressing the On/Off switch and ensuring the transformer electrical plug is fully engaged. If these steps don't work, the fill valve may be malfunctioning, or the level control system may have issues. Also, the humidifier might be in auto drain mode, which is normal and will resolve itself after the sequence is complete.
  • K
    katievalenciaAug 22, 2025
    Why won't my Aprilaire 1150 turn on or heat up?
    • W
      wrightdianeAug 22, 2025
      If your Aprilaire Humidifier does not energize and the chamber does not heat up, it could be due to a lack of supply voltage or control voltage, or an open over-temperature thermostat. Check the main line fuse and safety switch, and verify the relay/contactor electrical plug is fully engaged. Ensure proper supply voltage per the wiring diagram, verify the multi-tap transformer wiring, and check for 24 VAC control circuit voltage. Reset the transformer circuit breaker if needed and reset the manual over-temperature switch located above the heater on the humidifier cover. If the non-resettable over-temperature thermostats are open, they will need to be replaced.
  • C
    Charles WilkinsonAug 28, 2025
    What does it mean when the drain light is blinking on my Aprilaire 1150 Humidifier?
    • J
      johnsonleroyAug 28, 2025
      If the drain light on your Aprilaire Humidifier display panel is blinking on and off, several issues could be the cause. First, make sure the drain valve electrical plug is fully engaged and properly wired. Check for voltage at the valve; if present, consider cleaning or replacing the valve. Also, ensure the chamber drain outlet isn't blocked. Clean the water detection probes or replace the probe rod assembly. The fill valve might be plumbed backward, so check its flow direction. If it's plumbed correctly but leaking, replace it. Finally, ensure the drain line isn't backing up with water by verifying its pitch and size, and check for any blockages.
  • L
    laura24Aug 29, 2025
    Why is my Aprilaire 1150 outputting less steam than usual?
    • T
      Timothy JonesAug 29, 2025
      If your Aprilaire Humidifier is not producing enough output, even with the correct water level, it could be due to a malfunctioning control system or a heater issue. Check auxiliary limit controls like the high humidity limit switch and airflow proving switch, resetting, replacing, or calibrating them as needed. Also, check if the heater over-temperature thermostat or non-resettable over-temperature thermostats have tripped. For heater malfunctions, ensure the relay/contactor and transformer electrical plugs are fully engaged, verify proper voltage to the heaters, and check heater amperage. If the heater power device isn't working, it may need replacement.
  • A
    Alicia PittmanAug 31, 2025
    How to fix a slowly blinking On/Off light on Aprilaire Humidifier?
    • P
      Patrick ClarkAug 31, 2025
      If the On/Off light on your Aprilaire Humidifier display panel is blinking slowly (one blink per second), it is likely due to mineral buildup or oxidation on the probe rods, or deterioration of the probe rod assembly. Try removing the probe assembly and cleaning the probe rods, then reset the power to clear the warning. If that doesn't work, the probe rod assembly may need to be replaced.
  • D
    Daniel RodriguezSep 2, 2025
    What to do if the fill valve won't close on my Aprilaire 1150?
    • A
      Andrea JohnsonSep 2, 2025
      If the fill valve on your Aprilaire Humidifier is not closing, it could be due to a malfunctioning level control system, a fill valve that is stuck open, or an open drain valve. Check that the probe electrical plug is fully engaged and wired correctly, ensuring the green and yellow ground wire is connected to the correct terminal and subpanel. Also, check for control voltage across the fill valve coil and inspect the fill valve for backward installation or obstructions. If the drain valve is open, reset it to automatic or clean/replace it if necessary.
  • K
    Kenneth CraigSep 4, 2025
    What does it mean when the On/Off light is blinking rapidly on my Aprilaire Humidifier?
    • S
      summersjenniferSep 4, 2025
      If the On/Off light on the display panel of your Aprilaire Humidifier is blinking rapidly (10 blinks per second), it indicates an illogical probe fault. This could be due to incorrect probe wiring, deterioration of the probe rod assembly, or foaming in the chamber water. Verify the probe wiring according to the wiring diagram, ensuring the probe wires are separate from high voltage wires and the ground wire is properly connected. If the wiring is correct, the probe rod assembly may need to be replaced. Additionally, clean the chamber to address potential foaming.
  • P
    Pam PerezSep 6, 2025
    Why does the fill valve cycle on and off frequently on my Aprilaire Humidifier?
    • D
      dixonloriSep 6, 2025
      If the fill valve on your Aprilaire Humidifier is cycling on and off frequently (several times per minute), it could be due to a malfunctioning level control system or a drain valve that is not fully closed. Try cleaning the probes and verifying that the probe wiring is correct. Also, check the water conductivity and add salt if necessary to increase it. If the drain valve is not fully closing due to an obstruction, clean the valve.
  • Y
    yjacobsSep 8, 2025
    What causes heater burnout in an Aprilaire 1150?
    • M
      Michael ThompsonSep 8, 2025
      If your Aprilaire Humidifier's heater burns out, it could be due to improper wiring, a low water level, mineral buildup on the heaters, or heater corrosion. Verify the proper voltage is applied to the heater and check all electrical connections. If the water level is too low, replace the probe assembly. For mineral buildup, consider increasing cleaning frequency or using softened supply water. Inspect the heater for surface corrosion or pitting, which is often caused by high chloride levels in the water supply.
  • D
    Diana WilkinsSep 10, 2025
    Why are all the indicator lights off on my Aprilaire Humidifier?
    • I
      ijamesSep 10, 2025
      If all indicator lights on your Aprilaire Humidifier are off, ensure the On/Off switch on the display panel is pushed. Check the display panel ribbon cable connection and verify it's connected correctly. Inspect the transformer secondary circuit breaker and reset it if tripped, checking for wiring shorts. Also, ensure the power panel breakers are not open, verify proper voltage at the transformer, and confirm the transformer electrical plug is fully engaged.

Summary

Product Overview

Materials Provided and Not Provided

Lists components included and required for installation.

Electrical Specifications

Details electrical requirements, current draw, and weights for models.

Humidifier Operation

Internal Controller Features

Explains the functions and features of the internal humidifier controller.

Sequence of Operations

Details the step-by-step operation for Model 1150 and 1160/1180.

Display Panel and Indicator Lights

Explains the display panel and its indicator light meanings for status and troubleshooting.

Installation

Wiring Diagrams

Provides wiring schematics for Model 1150, 1160, and 1180 configurations.

Setting Slide Switches

Guides on configuring internal slide switches for control input and water type.

Component Location Selection

Provides guidance on selecting locations for the humidifier and distribution tube.

Distribution Tube Installation

Step-by-step instructions for installing the steam distribution tube in the duct.

Mounting the Humidifier Unit

Details methods for mounting the humidifier unit on walls or suspending it.

Field Wiring and Connections

Field Wiring Connections and Requirements

Outlines requirements and considerations for making field wiring connections to the humidifier.

Line Power Requirements

Specifies voltage and breaker requirements for the humidifier's line power connection.

Control Wiring Best Practices

Discusses proper control wiring to prevent electrical noise and ensure compatibility.

Control Input Wiring Configurations

Explains different control input types and wiring configurations for the humidifier.

Airflow Proving Switch and Water Piping

Covers installation of airflow switch and supply/drain piping.

Distribution Drip Tee Installation

Instructions for installing a drip tee for proper steam hose pitch.

Humidifier Start-Up Procedure

Electrical Start-Up Checks

Verifies electrical connections, plugs, and switch settings before initial power-up.

Water Supply and Initial Operation

Steps for turning on water supply, power, and verifying initial operation.

Maintenance

Inspect and Service Humidifier

Detailed steps for accessing and servicing the steam chamber.

Off-Season Shut Down Procedure

Instructions for preparing the humidifier for storage at the end of the season.

Troubleshooting

Indicator Light and Unit Operation Issues

Addresses issues indicated by lights, unit not operating, or heating problems.

Water Fill, Drain Valve, and Humidity Level Issues

Troubleshoots problems related to water flow, valves, and humidity control.

Replacement Parts

Controller and Display Panel Parts

Details components of the internal controller board and display panel connections.

Humidifier Parts List and Diagram

Illustrates and lists part numbers for various humidifier components.

Appendix: Absorption Distance Calculation

Absorption Distance Calculation Steps

Provides a step-by-step guide to calculate the required absorption distance in the duct.

Absorption Distance Charts and Factors

Displays charts and tables for calculating absorption distance and moisture content factors.

Warranty Information

Warranty Registration

Instructions and information for registering the product warranty.

Aprilaire 1150 Specifications

General IconGeneral
BrandAprilaire
Model1150
CategoryHumidifier
LanguageEnglish

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