Honeywell HM750A1000 User Manual

INSTALLATION INSTRUCTIONS
33-00289-01
IMPORTANT
Read and save these instructions. This guide should be kept by the installer.
HM750A1000
ADVANCED ELECTRODE STEAM HUMIDIFIER
INTRODUCTION
The HM750 is the most advanced residential steam
humidifier available and provides steady and reliable
humidification for a home. The humidifier is designed for
connection directly to a supply air duct for humidity on
demand. The humidifier may be directly mounted to the air
duct, or remotely from the air duct, with a steam hose
connecting the humidifier to a distributor nozzle installed
at the air duct.
Included in the Box
— HM750 steam humidifier
— H6062 HumidiPRO
— Steam distributor nozzle
— Rubber drain hose
— LDPE water hose
— Baffle (duct mount only)
— Foam gasket (duct mount only)
— Steam hose (wall mount only)
— Fittings, hardware, and mounting template
— Installation Instructions, 33-00289 (this document)
— Annual Operation and Maintenance Reminder
Tools Needed
— Flat-head screwdriver
— Phillips screwdriver
—Wrench
— Copper pipe (optional)
— Level
—Hole saw
Humidifier Configuration
The HM750 is configured at the factory to operate under
most conditions without the need to change its
configuration.
NOTE: Because the humidifier is factory configured for
optimal performance, Honeywell strongly
discourages changes to the configuration of the
humidifier not described in these instructions.
Before Installation
1. Ensure that available voltage and phase
corresponds with humidifier voltage and phase as
indicated on humidifier’s specification label.
2. Ensure that the dedicated external fuse disconnect
is of sufficient size to handle the rated amps as
indicated on the specification label. Refer to local
codes.
3. Ensure sufficient clearances will be available as
described in the Location section on page 6.
4. If the humidifier will be wall mounted, ensure steam
lines can be routed to duct as described in the Steam
Line Instructions on page 7.

Honeywell HM750A1000 Specifications

General

Brand	Honeywell
Model	HM750A1000
Category	Humidifier
Language	English

Summary

Installation Instructions

Tools Needed

List of tools required for humidifier installation and setup.

Humidifier Configuration

Information on factory configuration and recommended settings.

Before Installation

Pre-installation checks including voltage, phase, and clearances.

Introduction

Included in the Box

Details of components provided with the HM750 humidifier.

Parts and Accessories

How the Humidifier Works

Steam Generation

Explanation of the process by which the humidifier produces steam.

Drains

Description of the auto-adaptive drain cycle for water conductivity.

Steam Distribution

Methods for delivering steam into the air duct.

Steam Line

Guidelines for installing steam lines, including sloping and insulation.

Sizing

Location

Steam Nozzle Location

Rules for positioning the steam distributor nozzle within the air duct.

Steam Line Instructions

Main Rules for Atmospheric Steam Lines

Key guidelines for safe and effective steam line installation.

Steam Distributor Nozzle

Specific instructions for installing the steam distributor nozzle.

Steam Line Installation Examples

Mounting the Humidifier

Mounting to a Wall

Instructions for mounting the humidifier on a wall stud.

Mounting to the Supply Duct

Plumbing

Connecting the Water Supply Line

Procedure for connecting the water supply to the humidifier.

Connecting the Drain Line

Procedure for connecting the drain hose to the unit.

Electrical

Connecting Power

Wiring guidelines for connecting the main power supply.

Requirements

Specifications for electrical wiring and circuit connections.

Low-voltage Controls

Requirements

Wire gauge and routing requirements for low-voltage controls.

Wiring Procedure

How to connect humidistats, air proving devices, and external fans.

Humidistat or Thermostat Connection

Connecting control devices to the HUM terminals.

Air Proving Device

Connecting an air proving device to the AP terminals.

Fan Interlock

Connecting external fan control to the EXTERNAL terminals.

Fan Interlock Wiring with HumidiPRO

Specifics for interlock wiring with HumidiPRO control.

Humidity Control

Best practices for locating and setting humidity controls.

Optional Outdoor Temperature Sensor (included with HumidiPRO)

Instructions for mounting the outdoor temperature sensor.

Start Up

Installation Check

Final inspection steps before powering on the unit.

On/Off

How the humidifier operates in On/Off mode.

Start Up Procedure

Step-by-step guide to power on and initialize the humidifier.

Operation

LED Status Lights

Understanding the meaning of the humidifier's status LEDs.

Main Button

Functionality of the Power/Drain button for control and reset.

Selecting a Relative Humidity Setpoint

Guidance on setting the desired humidity level.

Maintenance and Servicing

Required Maintenance

Routine checks and cleaning for optimal humidifier performance.

Hose Connections

Inspection and cleaning of hose connections.

Nozzle (Duct or Remote)

Inspection and cleaning of the steam distributor nozzle.

Extended Shutdown

Procedure for safely powering down the humidifier for extended periods.

Starting After Extended Shutdown

Steps to safely restart the humidifier after a long shutdown.

Replacement Parts

Cylinder Spent Fault

Indicators and actions for a spent humidifier cylinder.

Cylinder Replacement Kit

Information on the replacement cylinder kit and tools needed.

Removing the Cylinder

Drain Valve Removal

Inlet Valve Strainer Cleaning

Opening Electrical Compartment

Removing the Control Board

Steps to safely remove the main control board.

Installing the Control Board

Steps to safely install a replacement control board.

Inlet Valve Replacement

Troubleshooting

Troubleshooting Requirements

Prerequisites and general advice for troubleshooting the humidifier.

HM750 Faults

LED Flash Sequence

Interpreting red Fault LED flash patterns for error identification.

Clearing a Fault

Procedure to reset the humidifier after a detected fault.

5 Year Warranty