Anden A77 Manual

Model A77
Dehumidifier Control
Installation & Operating Instructions
READ AND SAVE THESE INSTRUCTIONS
OVERVIEW
The control allows the user to set and adjust the humidity setting and turn dehumidification on
or off from a convenient location. In this application, the Model A77 uses an onboard sensor to
monitor the relative humidity (%RH) in the space in which it is located and displays the measured
relative humidity on the digital display.
Installed by: ����������������������������������������������������������
Installer phone: ���������������������������� Date installed: ����������������
90-2483
1

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. Line voltage may cause serious injury from electric shock. Disconnect electrical power
before starting installation or servicing. Leave power disconnected until installation/
service is completed. This control is not a 120 Volt (line voltage) device.
CAUTION
1. Read all instructions before beginning installation.
2. Do not use in pool applications. Pool chemicals can damage the control.
3. Do not use solvents or cleaners on or near the display and circuit board. Chemicals can
damage components.
TABLE OF CONTENTS
OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
LOCATION RECOMMENDATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Mount Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Wiring A77 with Dehumidifier Models A70, A95, A95F, A130, A130F,
A210V1, A320V1 and A320V3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
SYSTEM CHECKOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Power Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Humidity Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Turning On and Setting the Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Sequence of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Dehumidifier Diagnostic Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
TABLE 1 – Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
TABLE 2 – Dehumidifier Diagnostic Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
LIMITED WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
SPECIFICATIONS
ELECTRICAL
Input Voltage and Current Voltage: 24VAC +/-20%
Current: 25mA (nominal), 50mA (max.) at 24VAC
Output Dry Contact, Normally Open
CONTROL
Control Range 35% – 80% RH
Accuracy +/-5% RH
Differential 3%
Low Limit 40°F Dew Point
High Limit 99°F Dry Bulb
32

LOCATION RECOMMENDATIONS
MOUNT CONTROL
• In the area where moisture levels need to be monitored and controlled.
• On an interior wall.
• At/near canopy height.
• At least 18" from an outside wall.
DO NOT MOUNT CONTROL
• In the flow of a supply register.
• Behind doors, in corners or other dead air spaces.
• In direct sunlight, near lighting fixtures, or other appliances that give off heat.
• On an outside or unconditioned area wall.
• In stairwells or near outside doors.
• On a wall with concealed pipes or ductwork.
5
FEET
NONO
18"
MINIMUM
NO
90-1640
FIGURE 1 – MOUNTING LOCATION
INSTALLATION
MOUNT CONTROL
PULL APART
BACK PLATE
FRONT COVER
ANCHOR
BACK PLATE
SCREW
90-2504
90-2485
FIGURE 2 – DISASSEMBLE CONTROL
FIGURE 3 – MOUNT BACK PLATE
54

REQUIRED COMPONENTS
• 18-22 gauge wire (field supplied), 4 wires required, run new cable as needed.
• (2) #8 x 1-1/2" mounting screws (supplied)
• (2) Anchors (supplied)
1. Level the back plate on the wall and mark the mounting holes and wire access location on the
wall.
2. Drill two 3/16" mounting holes and a 3/4" wire access hole. See FIGURE 3.
3. Install the drywall anchors flush with the wall surface. Note: Mounting holes on the back plate
are designed to fit on a horizontal J-box.
4. Run a 4-wire cable from the dehumidifier to the wall mount location and through the square
hole in the back plate.
5. Secure the back plate to the wall using the two #8 x 1-1/2" screws.
CONTROL
PANEL COVER
CONTROL WIRING ACCESS
COVER
FILTER ACCESS DOOR
FIGURE 4 – WIRING ACCESS COVER LOCATION
90-1884
+ - A B ODT
SensorRemote
Gh Rf Cf Gs YW
HVAC EQUIP.
MODEL A77
CONTROL
DH
DH
R/+
C/-
B
A
FIGURE 5 – MODEL A77 WIRING WITH DEHUMIDIFIER MODELS
A70, A95, A95F, A130, A130F, A210V1, A320V1 AND A320V3
90-2490
WIRING A77 WITH DEHUMIDIFIER MODELS A70, A95, A95F, A130, A130F, A210V1 AND A320V1
1. Disconnect power to the
dehumidifier and HVAC system.
2. Remove the wiring access
cover next to the control on the
dehumidifier. See FIGURE 4.
3. Wire the Model A77 to the
dehumidifier as shown in
FIGURE 5.
4. Ensure the NO/NC switch on the
dehumidifier control is set to NO.
See FIGURE 5.
76

5. Snap the wiring access cover back into place, power up the dehumidifier and use the ON/OFF
button to turn the unit OFF (if ON).
90-1854
6. Press and hold the MODE button for 3 seconds to enter the Installer Set Up menu. REMOTE
DISABLED will appear on the display when Installer Set Up is entered.
7. Press the or button to change to REMOTE ENABLED.
90-1854
8. Repeatedly press the MODE button until DONE appears on the display.
SYSTEM CHECKOUT
POWER UP
1. Check all wiring.
2. Plug in dehumidifier and restore power to the HVAC system.
3. Turn on/off switch on dehumidifier ON. After a 4 second start up sequence all buttons on the
Model A77 will be functional.
• The control will be OFF.
• The humidity setting will be 60%.
• The control will display the measured humidity.
90-2483
90-1636
FIGURE 6 – EXTERNAL CONTROL
MODEL A77 CONTROL
MODEL A77 LCD DISPLAY
Blinking ON + *:Control Limit Exceeded.
See Control Limits, page 11.
Solid ON:
Control On
Blinking ON:
Dehumidifying
Measured
Humidity or
Setting Control On/Off
Humidity Setting
and Offset
Adjustment
Control must be
ON to adjust offset
and setting.
SET: Shows when
humidity setting
displayed or being
changed.
OFF: Control Off
98

TEST MODE
1. Press and hold the ON button for 5 seconds to enter Test Mode.
a. Verify the measured humidity is displayed on the Model A77 screen.
b. Verify ON blinks on the Model A77 screen.
2. After 5 minutes or after pressing the OFF button, the control will enter Off mode.
a. Verify the dehumidifier turns off.
HUMIDITY SETTING
• The control must be ON to adjust the humidity setting.
• The (up) and (down) buttons are used to increase or decrease the setting.
• The first press of either button will display the current setting and SET on the LCD display.
• Each subsequent push of the or button will change the setting by 1% RH.
• If a button is held down, the setting will continually change by 1% every 1/2 second for as long
as the button is pressed.
• The control will return to Normal Mode, displaying the measured humidity, 5 seconds after the
last button press/release.
OFFSET
An offset can be applied to the humidity reading
to avoid discrepancies with other humidity
measuring devices. Allow 48 hours for the control
to acclimate before applying an offset. The control
must be ON to enter the Offset screen.
• Press and hold the OFF button for 5 seconds to
enter the Offset screen.
• The buttons can be used to set an
offset value between -5% RH and +5% RH.
• The control will return to Normal Mode,
displaying the measured humidity, 5 seconds
after the last button press/release.
FIGURE 7 – OFFSET SCREEN
90-1636
TURNING ON AND SETTING THE CONTROL
1. Press the ON button on the dehumidifier user interface and on the Model A77 control.
2. Use the buttons to set the control at the desired humidity level.
Increasing the humidity setting will decrease dehumidifier run time, allowing for higher
humidity levels.
Decreasing the humidity setting will increase dehumidifier run time, allowing for lower
humidity levels.
SEQUENCE OF OPERATION
Normal Mode
• When the measured humidity is greater than the setting, the control will activate the dehumidifier
output, the dehumidifier will begin dehumidifying and ON will blink on the LCD display.
• When the measured humidity falls 3% below the setting, the control will deactivate the
dehumidifier output, the dehumidifier will stop dehumidifying and the LCD will display a solid ON.
Control Limits
• If the control measures a dew point below 40°F OR a temperature above 99°F, the control
will deactivate the dehumidifier output if actively dehumidifying, the dehumidifier will stop
dehumidifying, and ON and *will blink on the LCD screen.
• The control will resume normal operation when the measured dew point is greater than 45°F
or the measured temperature is below 94°F, whichever control limit was exceeded.
1110

TROUBLESHOOTING
Use the guide on the following page to help find and correct system faults. Contact Technical
Support before replacing the control or for additional troubleshooting. Technical Support is
available Monday through Friday, 7:00 a.m. to 5:00 p.m. CST, at [phone].
ERROR CODES
When the control detects an internal error, it will stop
controlling, deactivate the dehumidifier output, and
the LCD will display the Error Code. See FIGURE 8.
The control will attempt to recover from the error
every 10 minutes. The Error Code will continue to be
displayed as long as the error condition exists. Button
presses are not registered when in Error Mode.
Cycling power to the control will not clear the code
and the control will need to be replaced.
FIGURE 8 – ERROR CODE SCREEN
90-1636
TABLE 1 – TROUBLESHOOTING GUIDE
Symptom Possible Reason Troubleshooting Procedure
No power to the
control.
Incorrect wiring. Verify wiring connections between control,
dehumidifier and HVAC system (where applicable).
No power to dehumidifier. • Verify that the dehumidifier power switch is ON.
• Verify the circuit breaker has not tripped.
No power to HVAC
equipment.
• Verify HVAC system switch is on.
• Verify the circuit breaker has not tripped.
Control does
not turn on
dehumidifier
output.
Incorrect wiring. Verify wiring connections between control and
dehumidifier.
Blank display
or missing
segments during
Test mode.
LCD error. Replace control.
Display shows Er.Control detected an
internal error.
The control will need to be replaced.
Inaccurate
humidity reading.
Control recently installed
after being stored in an
uncontrolled temperature
and humidity environment.
Allow 48 hours for control to acclimate.
Offset has been applied to
the humidity reading.
Change the offset.
Control is mounted in direct
sunlight, above a heat or
humidity source, or in the
path of a supply register.
Relocate the control.
DEHUMIDIFIER DIAGNOSTIC CODES
When a dehumidifier error occurs, the diagnostic code will be displayed on the A77 screen.
1312

TABLE 2 – DEHUMIDIFIER DIAGNOSTIC CODES
Diagnostic
Code Failure Mode Action Reset
E2 High
Refrigeration
Pressure
1. Verify that the fan works, the backflow damper
swings freely and there is no blocked or restricted
ductwork.
2. If the fault persists, call Technical Support.
Cycle Power
E3 Model A77
Remote Control
Communication
Loss
1. Check connections between Model A77 and
dehumidifier control board. Terminals should be
fully inserted and secured in the control board and
Model A77 control terminals.
2. If connections are correct and secure, turn off
the dehumidifier and remove the Model A77.
Use a short section of 4-wire cable to reconnect
the Model A77 to the control board. Turn the
dehumidifier back on and increase the dryness
level setting on the Model A77. If the dehumidifier
turns on, the problem is with the wiring between
the dehumidifier and control.
3. If the dehumidifier does not turn on, call Technical
Support.
Self-Correcting
E4 Insufficient
Capacity
1. Check the frost sensor connection at the power
board. Terminal should be fully seated on the
power board pins.
2. Remove the side access panel and verify that the
sensor is secured to the suction line.
3. If the sensor is connected and secured to the
refrigeration line proceed to the next step.
4. Reset the fault by cycling power to the
dehumidifier.
5. Turn the humidity setting down (below room/
home humidity level) to make a dehumidification
call.
6. Allow the fan and compressor to run for
approximately 10-15 minutes and then enter
diagnostic test mode by simultaneously pressing
the and MODE buttons for 3 seconds. The
LCD will display the temperature measured by
the internal sensor while also displaying AIR
SAMPLING and ON, the humidity measured by
the internal sensor while also displaying %RH and
ON, and the frost sensor temperature while also
displaying ON. Scroll through these values and by
using the buttons.
7. Record values and call Technical Support.
Cycle Power
TABLE 2 – DEHUMIDIFIER DIAGNOSTIC CODES
Diagnostic
Code Failure Mode Action Reset
E5 High
Temperature
Thermistor
Failure
1. Check the high temperature sensor connection at
the power board. Terminal should be fully seated
on the power board pins.
2. Remove the side access panel and verify the
sensor is not damaged and connected to the
refrigeration line coming from the compressor.
3. If the sensor is connected and secured to the
refrigeration line, it may need to be replaced with
Part No. 5456 – contact Technical Support to
confirm.
Cycle Power
E6 Low
Temperature
Thermistor
Failure
1. Check the low temperature sensor connection at
the power board.
2. Remove the side access panel and verify the sensor
is not damaged and connected to the suction line.
3. If the sensor is connected and secured to the
refrigeration line, it may need to be replaced with
Part No. 5455 – contact Technical Support to
confirm.
Cycle Power
E7 Float Switch
Open
1. Empty the condensate pan.
2. Check the float switch connection at the control
board.
3. If not using a float switch, verify jumper is between
float switch terminals on dehumidifier control board.
4. If the problem persists, replace the float switch.
Self-Correcting
1514

LIMITED WARRANTY
Your Research Products Corporation Anden™ Dehumidifier Control is expressly warranted for five (5) years from date of installation to be
free from defects in materials or workmanship.
Research Products Corporation’s exclusive obligation under this warranty shall be to supply, without charge, a replacement for any control
which is found to be defective within such five (5) year period and which is returned not later than thirty (30) days after said five (5) year
period by you to either your original supplier or to Research Products Corporation, Madison, Wisconsin 53701, together with the model
number and installation date of the control.
THIS WARRANTY SHALL NOT OBLIGATE RESEARCH PRODUCTS CORPORATION FOR ANY LABOR COSTS AND SHALL NOT APPLY TO
DEFECTS IN WORKMANSHIP OR MATERIALS FURNISHED BY YOUR INSTALLER AS CONTRASTED TO DEFECTS IN THE CONTROL ITSELF.
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE
AFORESAID FIVE YEAR PERIOD. RESEARCH PRODUCTS CORPORATION’S LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES,
OTHER THAN DAMAGES FOR PERSONAL INJURIES, RESULTING FROM ANY BREACH OF THE AFORESAID IMPLIED WARRANTIES OR THE
ABOVE LIMITED WARRANTY IS EXPRESSLY EXCLUDED. THIS LIMITED WARRANTY IS VOID IF DEFECT(S) RESULT FROM FAILURE TO HAVE
THIS CONTROL INSTALLED BY A QUALIFIED HEATING AND AIR CONDITIONING CONTRACTOR. IF THE LIMITED WARRANTY IS VOID DUE
TO FAILURE TO USE A QUALIFIED CONTRACTOR, ALL DISCLAIMERS OF IMPLIED WARRANTIES SHALL BE EFFECTIVE UPON INSTALLATION.
Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limitation of incidental or consequential
damages so the above exclusion or limitations may not apply to you.
This warranty gives you specific legal rights and you may also have other rights which vary from state to state.
WARRANTY REGISTRATION
Visit us online at anden.com to register your Anden product. If you do not have online access, please mail a postcard with your name,
address, phone number, email address, product purchased, model number, date of purchase, and dealer name and address to: Research
Products Corporation, P.O. Box 1467, Madison, WI 53701.
Your warranty registration information will not be sold or shared outside of this company.
anden.com
P.O. Box 1467
Madison, WI 53701-1467
800.972.3710 F: 608.257.4357
Printed in USA
©2019 Anden – A Quality brand from Research Products Corporation
61001812 B2208531A 5.19
16