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Aprilaire 1750 Service Manual

Aprilaire 1750
16 pages
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Wire
Routing
Port
Wiring
Access
Filter
A
ccess
H
umidity
Control
I
nlet
Drain
On/Off
Switch
Filter
A
ccess
S
ervice
Access
Port
Outlet
Installation, Safety & Maintenance Manual
Model 1750/1770
Dehumidifier
INSTALLER – PLEASE NOTE!
1. Installation must conform to all applicable codes.
2. For the 1750, a dedicated 15 Amp circuit is recommended but not required for proper operation of the
dehumidifier. If a dedicated circuit is not available, use a lightly loaded circuit. Do not use an extension cord.
3. For the 1770, a dedicated 20 Amp circuit is required for proper operation of the dehumidifier.
If a dedicated circuit is not available, do not install unit. Dehumidifier must be plugged in directly to an outlet.
Do not use an extension cord.
4. For protection of the compressor, unit must be transported and installed in an upright position.
If the unit was shipped or stored on its side, a 24 hour settling period is required before running the unit.
TABLE OF CONTENTS
Safety Instructions . . . . . . . . . . . . . . .2
Overview . . . . . . . . . . . . . . . . . . . . . . .2
Specifications . . . . . . . . . . . . . . . . . . .2
Location Notes . . . . . . . . . . . . . . . . . .2
Ducting . . . . . . . . . . . . . . . . . . . . . . . .3
Drain Line . . . . . . . . . . . . . . . . . . . . . .3
Hanging . . . . . . . . . . . . . . . . . . . . . . .3
Installations
Central . . . . . . . . . . . . . . . . . . . . . . . .4
Localized . . . . . . . . . . . . . . . . . . . . . . .6
Central/Zoned . . . . . . . . . . . . . . . . . . .8
Air Cycling . . . . . . . . . . . . . . . . . . . .10
Float Switch . . . . . . . . . . . . . . . . . .12
Dip Switch Definitions . . . . . . . . . . .12
System Checkout . . . . . . . . . . . . . . .13
Troubleshooting . . . . . . . . . . . . . . . .14
Sequences
of Operations . . . . . . . . . . .Back Cover
90-121590-1214

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Aprilaire 1750 Specifications

General IconGeneral
Model1750
Voltage115V
Dehumidification Capacity70 pints per day
Moisture Removal Capacity70 pints per day
Filter TypeMERV 8
DrainageGravity Drain
Humidity Control Range35% to 70% RH

Summary

Installer Notes and Precautions

Installation Code Compliance

Emphasizes adherence to all applicable codes for safe installation.

Electrical Circuit Requirements

Specifies dedicated circuit needs for 1750 (15A) and 1770 (20A) models.

Unit Handling and Settling Period

Details correct transportation and required 24-hour settling period for compressor integrity.

Safety Instructions

Core Safety Warnings

Highlights risks of electrical shock, cuts from sharp edges, and potential injury from unit weight.

Overview

Dehumidifier Functionality and Features

Explains the unit's role in home humidity control and its air cycling/ventilation capabilities.

Specifications

Unit Dimensions, Capacity, and Performance

Provides technical details on size, weight, airflow, and operating conditions.

Location Notes

Installation Site Requirements

Offers guidance on placement and environmental considerations for optimal operation.

Ducting Installation

Ductwork Connection and Sealing

Details collar installation, recommended duct types, pressure, and sealing methods.

Drain Line Installation

Condensate Trap and Piping

Instructions for installing the drain trap and connecting the condensate line properly.

Unit Hanging

Suspension and Access Clearance

Guidelines for hanging the unit using unistruts and ensuring filter access.

Central Installation and Operation

Whole-Home Humidity Control Integration

Describes how to connect the dehumidifier with the HVAC system for whole-home humidity management.

Central Installation Wiring and Settings

Thermostat and HVAC Equipment Connections

Details the wiring diagram for connecting the dehumidifier to HVAC controls.

Dehumidifier Control Settings

Explains the dip switch and dial settings for various operational modes.

Localized Installation and Operation

Specific Area Humidity Control Setup

Outlines using the dehumidifier for humidity control in targeted areas like basements or crawlspaces.

Localized Installation Wiring and Settings

Thermostat and HVAC Connections

Shows the wiring diagram for localized installation with thermostat and HVAC.

Dehumidifier Control Settings

Describes dip switch and dial settings for localized operation modes.

Central/Zoned (Convertible) Installation

Zoned Humidity Control Configuration

Details setup for prioritizing specific zones and then managing whole-home humidity.

Central/Zoned (Convertible) Wiring and Settings

Damper and Transformer Connections

Explains wiring for system dampers and the 24 VAC transformer.

Dehumidifier Control Settings

Covers dip switch and dial settings for convertible zoned operation.

Ventilation and Air Cycling Settings

Air Cycling Operation Setup

Instructions for setting up periodic HVAC fan activation for air circulation.

Outside Air Ventilation Configuration

Details how to use an outdoor air damper for fresh air intake and ventilation.

Ventilation Requirement Calculation

ASHRAE Ventilation Airflow Calculation

Provides the formula and table for determining minimum ventilation CFM based on room size and bedrooms.

Fresh Air Delivery and Cycle Time

Determining Airflow Delivery Rate

Guides on measuring static pressure to determine actual airflow delivery.

Setting Ventilation Cycle Time

Explains how to set cycle period and time based on airflow requirements and tables.

Float Switch Installation

Condensate Overflow Safety Switch

Describes wiring a normally closed float switch for leak protection and compressor disabling.

Dip Switch Definitions

System Setup Switch Functions Explained

Details the purpose and operation of each system setup dip switch.

System Checkout Procedure

Pre-Operation System Verification Steps

Outlines essential checks for wiring and component functionality before system startup.

Troubleshooting Guide: Indicators and Common Issues

Understanding LED Codes and Test Mode

Explains LED indicators and behavior during test mode for diagnostics.

Resolving Common Dehumidifier Problems

Addresses issues like no airflow, hot air, poor dehumidification, and drainage problems.

Troubleshooting Guide: Advanced Scenarios

Damper and Fan Cycling Issues

Solves problems with dampers not opening or continuous fan cycling.

Ventilation and Compressor Faults

Addresses ventilation damper failures and compressor non-operation.

Dehumidifier Sequence of Operation

Unit Response to HVAC and Cycle Periods

Explains how the dehumidifier operates based on HVAC calls and set cycle periods.

Damper Sequence of Operation

Damper Function in Central/Zoned Modes

Describes how dampers control airflow in central and zoned installation configurations.

Ventilation/Air Cycling Sequence of Operation

Managing Outdoor Air and Fan Cycling

Details how ventilation and air cycling are activated based on settings and HVAC system status.

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