Aprilaire 1770A, 1750A installation instructions Troubleshooting Guide

Page 20

TROUBLESHOOTING (continued)

TABLE 9 – Troubleshooting Guide

Symptom

Possible Reason

Troubleshooting Procedure

Dehumidifier does

No power to unit..

• Check that the dehumidifier is plugged in.

 

 

 

not turn on/run..

 

• Check that the power switch on the dehumidifier is ON.

 

 

 

 

• Check that control knob is set to a dryness level number.

 

 

 

 

• Check that the circuit breaker has not tripped. The 1750A requires a minimum of 8 amps and

 

 

the 1770A requires a minimum of 14 amps..

 

 

 

 

 

 

 

 

 

 

Dehumidifier blower

Pressure drop across dehumidifier

• Check dehumidifier air filter and wash or replace.

 

 

 

is running but little or

is higher than 0..8”w..c.. (1750A) or

• Check for blocked duct work and clear.

 

 

 

no airflow..

1..5”w..c.. (1770A)..

• Check if back flow damper is blocked or stuck and remove obstruction.

 

 

 

 

 

 

 

 

 

 

 

 

Dehumidifier blower

Float switch open..

• If float switch installed, check connections at control board and empty condensate pan.

is running but

 

• If no float switch installed, check that the jumper is installed at the float switch terminals on

compressor is not..

 

control board..

 

 

 

 

 

 

 

 

 

 

Coil frosting..

• Lack of, or reduced airflow. Check/clean filter and check for blocked duct work.

 

 

• Inlet air conditions below 60°F. Use the control knob to turn down the dryness setting.

 

 

 

 

 

 

The dehumidifier

Incorrect damper wiring or bad

• Verify wiring between dampers and 24 VAC transformer.

 

 

damper does not

connection..

• If wired for Convertible operation, verify that 24 VAC transformer is 40 VA minimum.

open in TEST Mode..

 

• Check all wiring connections between dampers and control board.

 

 

 

 

 

 

 

 

 

 

 

 

 

HVAC fan does not

No power to HVAC equipment..

• Verify there is power to the HVAC equipment.

 

 

 

turn on when CYCLE

 

 

 

 

 

 

No power to dehumidifier..

• Check the voltage across the R & C terminals on the dehumidifier control board. Voltage

TIME potentiometer

is turned to TEST..

 

should be 18 VAC – 30 VAC..

 

 

 

 

Incorrect wiring..

• Verify wiring and connections between the thermostat, HVAC, and dehumidifier.

 

 

 

 

 

 

 

HVAC fan operates

HVAC call or constant fan..

• HVAC equipment is making a call.

 

 

 

continuously after

 

• The HVAC fan is set to constant ON.

 

 

 

control knob is

 

 

 

 

 

 

Dehumidifier air cycling/ventilation

• If the Cycle Time is equal to or greater than the Cycle Period, HVAC fan operation will be

moved out of TEST..

 

set to constant ON..

continuous..

 

 

 

 

 

• Reduce the Cycle Time if constant fan is not desired.

 

 

 

 

 

 

 

 

 

The ventilation

Cycle time met..

• The damper will not open if the Cycle Time has already been met.

 

 

damper does not

 

 

 

 

 

 

ODT error or inlet air out of

• Check that the ODT is wired correctly to

 

 

 

 

open when the HVAC

 

Outdoor

Resistance

 

fan is active..

temperature range..

dehumidifier control board and connections are

 

Temperature

 

 

 

 

 

 

secure..

 

 

 

 

 

 

 

0°F

84,500 OHMS

 

 

 

• Check that ODT is installed in the outdoor air

 

 

 

 

 

 

 

 

 

 

 

20°F

46,000 OHMS

 

 

 

intake according to set-up in Ventilation Section

 

 

 

 

 

 

 

 

 

 

 

40°F

26,000 OHMS

 

 

 

starting on page 12..

 

 

 

 

• Remove the ODT leads from the dehumidifier

 

60°F

15,500 OHMS

 

 

 

control board and check the resistance.. Compare

 

80°F

9,500 OHMS

 

 

 

the reading with the table at right..

 

 

 

 

 

 

 

100°F

6,000 OHMS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Dehumidifier is not

Drain line or drain trap blocked..

• Check that the drain trap is installed correctly.

 

 

 

draining properly..

 

• Check the drain trap and drain line for blockage by slowly pouring one pint of water into the

 

 

dehumidifier drip pan located below the coil..

 

 

 

 

 

• Check drain line for continuous downward slope.

 

 

 

 

 

 

 

 

 

The HVAC fan turns

Sampling or air cycling..

• Dehumidifier will turn on HVAC fan during sampling and as needed to meet air cycling or

on unexpectedly..

 

ventilation requirements as determined by the Cycle Period and Cycle Time..

 

 

 

 

 

 

Dehumidifier is

Normal function..

• Air is reheated across the condenser coil, resulting in a temperature rise between inlet and

producing hot air..

 

outlet..

 

 

 

 

 

 

 

 

 

 

P.O. Box 1467 • Madison, WI 53701-1467 • Phone: 800/334-6011 • Fax: 608/257-4357www.aprilairepartners.com

10009174 10..10

Printed in U..S..A..

B2205271A

© 2010 Aprilaire – A division of Research Products Corporation

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Contents Safety Instructions Table of ContentsOverview Whole-Home, see Spot, see Convertible, seeSpecifications Unpacking and ContentsInstall Unit Indoors Do not expose to elements Power Outlet within 8 ft.. of unitLocation Considerations Location NotesMechanical Installation Duct Collars & Backflow DamperDuctwork Recommendations Design AirflowsDrain Mechanical InstallationWhole-Home installation Attic Installation Note Basement Ducting & WiringAttic Ducting & Wiring Spot installation DIP Switch ConfigurationSequence of Operation Duct Work Grilles with 8 duct collarsDucting & Wiring Wiring NotesOptional Component Convertible installationCondensate Pan & Normally Closed Float Switch OFF Test Ventilation oR Air Cycling Determine Cycle Time Determine Fresh AIR Delivery RateCFM Delivered Switch Notes Outdoor Temperature Sensor InstallationVent-Auto Vent-Timed, Hvac Initiates VentilationVent-Timed, Dehumidifier Initiates Ventilation Wiring & DIP Switch Configuration Model 70 living space controlLocal Whole-HomeThird-party control ExternalAdjusting Dehumidifier SET Point System CheckoutDehumidification VentilationTroubleshooting LED CodesGreen LED Codes Red LED CodesTroubleshooting Troubleshooting Guide
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1770A, 1750A specifications

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