Aprilaire 1750A Installation Instructions Manual
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Aprilaire 1750A Installation Instructions Manual

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See also: Troubleshooting Manual , Owner's Manual
SAfETy INSTRUCTIONS
1. Improper installation may cause property damage or injury. Installation, service, and maintenance must be performed by a
qualified service technician.
2. 120 Volts may cause serious injury from electric shock. Disconnect electrical power before starting installation or servicing.
Leave power disconnected until installation/service is completed.
3. Sharp edges may cause serious injury from cuts. Use care when cutting plenum openings and handling ductwork.
4. Dropping may cause personal injury or equipment damage. Use a hand cart, dolly, or two people to transport dehumidifier.
1. Read all instructions before beginning installation.
2. Do not use in pool applications. Pool chemicals can damage the dehumidifier.
3. Do not use solvents or cleaners on or near the circuit board. Chemicals can damage circuit board components.
4. Wait 24 hours before running if the unit has not been shipped or stored in the upright position.

TAblE Of CONTENTS

Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Unpacking and Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
location Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Duct Collars & Backflow Damper . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
General Ductwork Recommendations . . . . . . . . . . . . . . . . . . . . . . . 5
Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Float Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
WARNING
CAUTION
READ AND SAVE THESE INSTRUCTIONS
Model 1750A/ 1770A Dehumidifier
Installation Instructions
Installation Configurations
(Duct layout, Wiring & Dip Switch Settings)
Single Zone - Ducted to HVAC System . . . . . . . . . . . . . . . . . . . . . . 7
Single Zone - Not Ducted to HVAC System . . . . . . . . . . . . . . . . . . 9
Two Zone - Primary and Secondary Zoned . . . . . . . . . . . . . . . . . . 11
Ventilation or Air Cycling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Model 76 Control
External Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Remote Control for Crawl Spaces . . . . . . . . . . . . . . . . . . . . . . . . . 20
System Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Service Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
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Summary of Contents for Aprilaire 1750A

  • Page 1: Table Of Contents

    Model 1750A/ 1770A Dehumidifier Installation Instructions SAfETy INSTRUCTIONS WARNING 1. Improper installation may cause property damage or injury. Installation, service, and maintenance must be performed by a qualified service technician. 2. 120 Volts may cause serious injury from electric shock. Disconnect electrical power before starting installation or servicing.

  • Page 2: Overview

    OVERVIEW The Aprilaire Dehumidifier is designed to control humidity inside the whole home . The dehumidifier uses a dew point calculation to control the ® humidity based on the dryness setting on the dehumidifier control . An optional Model 76 Control, Model 8910 Home Comfort Control , or other ™...

  • Page 3: Specifications

    Weight: 1750A – 93 lbs . External Static Pressure Airflow 1770A – 100 lbs . Capacity: 1750A – 90 pints per day @ 275 CFM 0 .0 “w .c . 380 CFM 1770A – 135 pints per day @ 500 CFM 0 .4 “w .c .

  • Page 4: Location Considerations

    lOCATION CONSIDERATIONS 1 . Install Unit Indoors: Do not expose TAblE 1 – location Notes to elements . Application location 2 . Drain Accessibility: A condensate Requirement pump may be required if a drain is not Attic Garage basement Crawl Space located in the installation area .

  • Page 5: Mechanical Installation

    GENERAl DUCTWORK RECOMMENDATIONS • W hen ducted to the HVAC supply, the outlet from the dehumidifier TAblE 2 – Maximum Duct lengths must be located at least 6” downstream of the cooling coil to 1750A 1770A prevent outlet air from pulling moisture from the coil . • T o minimize sound from air movement and vibration, install 5 feet External Static Pressure 0 .6”w .c .

  • Page 6: Drain

    MECHANICAl INSTAllATION (CONTINUED) DRAIN 1 . Adjust feet of dehumidifier to allow a 2-1/2” minimum clearance for drain trap . See figure 6 . Use the 90° elbow if necessary for fIGURE 6 – Drain Trap clearance restrictions . See figure 7 . Drain Outlet 2 .

  • Page 7: Single Zone - Ducted To Hvac System

    SINGlE ZONE – DUCTED TO HVAC SySTEM INSTAllATION Using the dehumidifier in conjunction with the HVAC system is the optimum solution Required Components for year-round, whole-home control . This installation is typically in basement or attic Duct Work 18 – 22 AWG Wire locations, where air is pulled from the return duct, dehumidified, and discharged to the supply duct .
  • Page 8 AIR HANDLER PLENUM AIR HANDLER FILTER 24" FILTER MIN. 1750A – 8" DIA. INSULATED DUCT 1770A – 10" DIA. INSULATED DUCT 1750A – 8" DIA. INSULATED DUCT BOTH SIDES CONDENSATE PAN 1770A – 10" DIA. INSULATED DUCT BOTH SIDES 90-1618-2 CONDENSATE PAN Dip Switch Note: HVAC fan must be activated during dehumidification .

  • Page 9: Single Zone - Not Ducted To Hvac System

    Duct Work spaces . The dehumidifier can remain non-ducted, however, to achieve specified Grilles with 8” dia . duct collars – 1750A performance it is recommended that the dehumidifier be ducted to the area requiring Grilles with 10” dia . duct collars – 1770A dehumidification .
  • Page 10 FROM AREA DEHUMIDIFIER • I f dehumidifying a location that is noise sensitive, install multiple registers to reduce air velocity . • A irflow is approximately 500 CFM for the 1770A, and 275 CFM for the 1750A . 90-1536 DIP SWITCH CONfIGURATION • C YCLE PERIOD: This determines how frequently the dehumidifier will sample fIGURE 16 – Single Zone – Not Ducted to the air to check the humidity level . Set to 1 hour and adjust as needed .

  • Page 11: Two Zone - Primary And Secondary Zoned

    NORMALLY CLOSED DAMPER 90-1536 90-1536 Ducting Note: The 1770A delivers approximately 500 CFM and the 1750A delivers approximately 275 CFM . Size ductwork and install multiple branches and grilles as needed to reduce airflow velocities to acceptable levels for the application .
  • Page 12 TWO ZONE – PRIMARy AND SECONDARy ZONED INSTAllATION (CONTINUED) WIRING & DIP SWITCH CONfIGURATION fIGURE 18 – Two Zone Wiring fIGURE 19 – Two Zone DIP Switch Settings DEHUMIDIFIER SYSTEM DAMPERS SYSTEM SETUP DEHUMIDIFIER NORMALLY OPEN NORMALLY CLOSED 24 VAC CONTROL BOARD (SECONDARY ZONE) (PRIMARY ZONE)
  • Page 13 TWO ZONE – PRIMARy AND SECONDARy ZONED INSTAllATION (CONTINUED) SEQUENCE Of OPERATION • T he Primary Zone takes priority during dehumidifier operation. Primary Zone sampling occurs at the end of each Cycle Period and Secondary Zone sampling occurs at the beginning of each Cycle Period . If the dehumidifier is actively dehumidifying the Primary Zone at the beginning of the Cycle Period, Secondary Zone sampling will not occur during that Cycle Period . Primary Zone sampling will also override a Secondary Zone dehumidification demand .

  • Page 14: Ventilation Or Air Cycling

    The dehumidifier has outputs available to open a normally closed damper, introducing outdoor air through an outdoor air intake duct . See figure 20a for Aprilaire Model 6506, 6” Normally Closed Damper standard ventilation ducting . 24 VAC Transformer (10VA min .) for Ventilation Damper 6”...
  • Page 15 VENTIlATION OR AIR CyClING (CONTINUED) fIGURE 21 – Ventilation Wiring 6" NORMALLY 24 VAC CLOSED DAMPER (10 VA min) TRANSFORMER DEHUMIDIFIER CONTROL BOARD FUNCTIONS IN THERMOSTAT HVAC EQUIPMENT AIR CYCLING MODE IF DAMPER NOT INSTALLED OPTIONAL OUTDOOR TEMPERATURE SENSOR See page 17 for outdoor temperature sensor installation.
  • Page 16 VENTIlATION OR AIR CyClING (CONTINUED) DETERMINE fRESH AIR DElIVERy RATE 1 . Measure the negative static pressure of the return system at the location where the outdoor air duct enters the return duct . 2 . See Table 4 for estimated inlet airflow in CFM, based on duct type, length, and available negative pressure . Use an airflow measuring device for a more accurate airflow delivery rate .
  • Page 17 VENTIlATION OR AIR CyClING (CONTINUED) SETTING DIP SWITCHES & CyClE TIME TO MEET VENTIlATION REQUIREMENTS fIGURE 22 – VENT-TIMED DIP Switch Settings fIGURE 23 – VENT-AUTO DIP Switch Settings SYSTEM SETUP SYSTEM SETUP LOCAL LOCAL EXTERNAL EXTERNAL HVAC FAN OFF HVAC FAN ON HVAC FAN OFF HVAC FAN ON...
  • Page 18 VENTIlATION OR AIR CyClING (CONTINUED) SEQUENCE Of OPERATION VENT-TIMED, HVAC INITIATES VENTIlATION • T he ventilation damper will open whenever there is an HVAC fan (Gs) or heat (W) call, and will stay open until the Cycle Time (during the Cycle Period) has been met . • W hen the HVAC heat or fan call has ended or when the ventilation time requirement has been met, the ventilation damper will close. • T wo minutes must elapse following the end of a HVAC fan or heat call before the dehumidifier can initiate a ventilation cycle. VENT-TIMED, DEHUMIDIfIER INITIATES VENTIlATION • W hen the amount of time remaining in the Cycle Period is equal to the amount of time needed to satisfy the Cycle Time, the HVAC fan turns on and the ventilation damper opens . • W hen the ventilation time requirement has been met, the HVAC fan turns off and the ventilation damper closes.

  • Page 19: External Control

    MODEl 76 EXTERNAl CONTROl When used as an external control, the Model 76 acts like a dehumidistat and will turn the dehumidifier on and off when the relative humidity goes above or below the setting . The Model 76 must be installed in the space that is being served by the dehumidifier. One example of this would be to install the Model 76 in the home’s living space and wire it to the dehumidifier which is located in the basement and is ducted to the HVAC system .

  • Page 20: Remote Control For Crawl Spaces

    MODEl 76 REMOTE CONTROl fOR CRAWl SPACES When used as a remote control, the Model 76 can be installed in any convenient location within the living space while the dehumidifier is fIGURE 28 – Crawl Space Installation installed in an inconvenient or difficult to access area that is going to be dehumidified, such as a crawl space, sealed attic, or basement (if getting to the basement is inconvenient or difficult for the owner) .

  • Page 21: Model 8910 Home Comfort Control ™ Or Third-Party Control

    MODEl 8910 HOME COMfORT CONTROl ™ OR THIRD-PARTy CONTROl When used as an external control, the Model 8910 Home Comfort Control or other third-party control acts like a dehumidistat and will turn ™ the dehumidifier on and off when the relative humidity goes above or below the setting . The Model 8910 Home Comfort Control or other ™...

  • Page 22: System Checkout

    SySTEM CHECKOUT DEHUMIDIfICATION 1 . Check the wiring to the HVAC equipment and any accessories if applicable . fIGURE 33 – Control Knob Setpoint 2 . Plug unit in and turn on/off switch to ON . 3 . Wait 5 seconds then rotate the main control knob clockwise to the TEST position . 4 .

  • Page 23: Troubleshooting

    TROUblESHOOTING Technical Support is available Monday through Friday, 7:00 a .m . to 5:00 p .m . CST, at (800) 334-6011 . Use the guides on the following pages to identify and correct system faults . Contact Technical Support before replacing the unit or components and for additional troubleshooting . lED CODES The dehumidifier control board uses the Status LED to communicate TAblE 7 –...
  • Page 24 1770A requires approximately 14 amps . Dehumidifier blower Pressure drop across dehumidifier • C heck dehumidifier air filter and wash or replace. is running but little or is higher than 0 .8”w .c . (1750A) or • C heck for blocked duct work and clear. no airflow . 1 .5”w .c . (1770A) . • V erify that the backflow damper is installed in the outlet duct collar and not the inlet duct collar.

  • Page 25: Service Parts

    Part No. Filter 4510 10 VA Transformer 5262 Drain Trap/Collars 4843 Capacitor, 60MF, 1770A 5255 Backflow Damper 4918 Capacitor, 55MF, 1710A/1750A 4922 Blower/Motor Assembly, 1710A/1750A 4515 High Temperature Cutout Switch 4924 Blower/Motor Assembly, 1770A 4646 Other Parts Power Supply Board 5260 Zoned Installation Kit (2-NO 8”...
  • Page 28 P.O. Box 1467 • Madison, WI 53701-1467 • Phone: 800/334-6011 • Fax: 608/257-4357 • www.aprilairepartners.com 10009845 5 .12 Printed in U .S .A . B2205733B © 2012 Aprilaire – A division of Research Products Corporation...

This manual is also suitable for:

1770a

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