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Aprilaire 1180 - User Manual

Aprilaire 1180
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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

Other manuals for Aprilaire 1180

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Quick Guide8 pages

Questions and Answers

  • M
    Madeline HamiltonAug 20, 2025
    Why is my Aprilaire Humidifier not filling with water?
    • H
      Heidi DurhamAug 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.
  • E
    Elizabeth JohnstonAug 22, 2025
    Why won't my Aprilaire 1180 turn on or heat up?
    • D
      daniellawsonAug 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.
  • M
    Mark WilliamsAug 28, 2025
    What does it mean when the drain light is blinking on my Aprilaire 1180?
    • W
      William SchmidtAug 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.
  • T
    Tonya MercadoAug 30, 2025
    Why is my Aprilaire 1180 Humidifier outputting less steam than usual?
    • H
      Heather BenjaminAug 30, 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.
  • I
    Isabella LewisSep 1, 2025
    How to fix a slowly blinking On/Off light on Aprilaire 1180 Humidifier?
    • J
      Julie Lewis MDSep 1, 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.
  • G
    gloverjonathanSep 2, 2025
    What to do if the fill valve won't close on my Aprilaire 1180?
    • S
      Stephanie SmithSep 3, 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.
  • R
    Reginald LucasSep 4, 2025
    What does it mean when the On/Off light is blinking rapidly on my Aprilaire Humidifier?
    • P
      Paul BoydSep 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.
  • D
    Darlene LivingstonSep 6, 2025
    Why does the fill valve cycle on and off frequently on my Aprilaire 1180 Humidifier?
    • J
      Jennifer RomeroSep 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.
  • S
    Stephanie KhanSep 8, 2025
    What causes heater burnout in an Aprilaire Humidifier?
    • S
      Sara PierceSep 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.
  • K
    Kevin JacksonSep 10, 2025
    Why are all the indicator lights off on my Aprilaire 1180 Humidifier?
    • W
      William MooreSep 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, Capacities and Weights

Details technical specifications like power, capacity, and weight.

Dimensions

Provides physical measurements of the humidifier unit.

Overview of Humidifier Operation

Explains the general working principles and control features of the humidifier.

Sequence of Operations

Details the step-by-step process during normal humidifier operation.

INSTALLATION

Setting Slide Switches

Instructions for configuring internal controller slide switches for optimal operation.

Choosing Humidifier Components Location

Guidance on selecting optimal locations for the distribution tube and humidifier unit.

Absorption Distance

Explains the required duct space for proper steam absorption into the airstream.

Humidifier Location

Considers ambient temperature, duct proximity, clearances, and electrical connections for placement.

Distribution Tube and Control Devices Location

Recommends optimal placement for the steam distribution tube and control devices in ductwork.

Choosing Distribution Tube Location

Discusses best, second, and last choice locations for the distribution tube.

Choosing Control Device Locations

Specifies recommended placement for limit switches and humidifier controls.

Distribution Tube Installation

Step-by-step guide for cutting, drilling, and mounting the steam distribution tube.

Mounting the Humidifier

Instructions for mounting the humidifier securely on walls or from ceilings.

Field Wiring

General guidelines and requirements for wiring the humidifier system.

Line Power Requirements

Details power supply voltage, amperage, breaker size, and grounding requirements.

Control Wiring Best Practices

Guidance on proper control wiring to prevent electrical noise and ensure compatibility.

Control Input Wiring Options

Explains how to connect different control signals like humidistats or external inputs.

OPERATION

Humidifier Start-Up Procedure

Comprehensive steps for safely starting and verifying the humidifier's operation.

Steam Chamber Verification

Checks chamber mounting and support before filling with water.

Piping and Electrical Checks

Verifies all piping connections, water pressure, and electrical connections.

Water Supply and Power On

Details turning on water supply, power, and verifying indicator lights.

Creating Water Seal

Procedure to fill the water seal (P-trap) in the drain line.

Initiating Humidity Demand

Steps to call for humidity and test the heating elements.

MAINTENANCE

Inspect and Service Humidifier

Procedures for inspecting, cleaning, and servicing the steam chamber and its components.

Removing the Steam Chamber

Step-by-step guide to safely remove the steam chamber for cleaning.

Cleaning and Reassembly

Instructions for cleaning the chamber interior, probe assembly, and reassembling.

Re-installing the Chamber

Steps to properly reinstall the steam chamber after maintenance.

Post-Maintenance Checks

Verifies electrical connections, drain valve operation, and checks for leaks.

Off-Season Shut Down Procedure

Guidelines for preparing the humidifier for storage at the end of the humidification season.

TROUBLESHOOTING

Indicator Light Status and Solutions

Explains blinking and off indicator lights and their corresponding causes/actions.

Unit Operation Issues

Addresses problems like unit not starting, not heating, or low humidity output.

Component Failures and Performance Issues

Diagnoses issues related to heaters, valves, water levels, and autodrain/end-of-season functions.

Performance and Noise Issues

Covers problems like incorrect humidity levels, noisy operation, and steam/water leaks.

REPLACEMENT PARTS

Display Panel and Controller Board

Identifies replacement parts for the display panel and internal controller board.

Humidifier Replacement Parts Diagram

Provides a visual diagram of humidifier components for part identification.

Replacement Parts List

A table listing part numbers for various humidifier components.

APPENDIX - ABSORPTION DISTANCE CALCULATION

Absorption Distance Calculation Steps

A step-by-step guide to calculating the required absorption distance in the ductwork.

WARRANTY

Warranty Information

Details the terms, conditions, and duration of the product warranty.

Warranty Registration

Instructions on how to register the product to activate the warranty.

Aprilaire 1180 Specifications

General IconGeneral
BrandAprilaire
Model1180
CategoryHumidifier
LanguageEnglish

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