Aprilaire 1830 Troubleshooting Manual
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Aprilaire 1830 Troubleshooting Manual

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Aprilaire Dehumidifier Troubleshooting Manual

Table of Contents

Troubleshooting Diagnostic Codes .............................................................................................................. 2
E1 ..................................................................................................................................................... 2
E2, E3 ................................................................................................................................................ 3
E4...................................................................................................................................................................4
E5, E6 ................................................................................................................................................ 7
E7, E8 ................................................................................................................................................ 8
E9...................................................................................................................................................................9
Verifying Capacity....................................................................................................................................... 10
Water Leaks ................................................................................................................................................ 15
Fan Does Not Function ............................................................................................................................... 15
Circuit Breaker Trips ................................................................................................................................... 16
Defrost, E8, Noise...............................................................................................................................................17
Parts Lists .................................................................................................................................................... 18
Electrical Schematics .................................................................................................................................. 22
Instruments you will need to complete troubleshooting:
1. Digital Multi-Meter (DMM) capability of measuring
• AC and DC voltage
• Resistance
• Capacitance
Minimum tools needed to complete troubleshooting:
1. Torx T20 and T25 screwdrivers or driver bits
2. Small (terminal) flat head screwdriver
3. Needle nose pliers
4. Level (to troubleshoot water leak claims)
WARNING: 120-volts can cause serious injury or death. Do not touch live, exposed 120-volt
!
wiring or wiring terminals.
Troubleshooting must be performed by a qualified HVAC service person trained to take the
proper safety precautions when performing service on 120-volt equipment.
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Models 1830, 1850, 1870

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  • Page 1: Table Of Contents

    Aprilaire Dehumidifier Troubleshooting Manual Models 1830, 1850, 1870 Table of Contents Troubleshooting Diagnostic Codes ......................2 E1 ..............................2 E2, E3 ..............................3 E4……………………………………………………………………………………………………………………………………………….4 E5, E6 ..............................7 E7, E8 ..............................8 E9……………………………………………………………………………………………………………………………………………….9 Verifying Capacity............................10 Water Leaks ..............................15 Fan Does Not Function ..........................

  • Page 2: Troubleshooting Diagnostic Codes

    Troubleshooting Diagnostic Codes The display on the dehumidifier will show the diagnostic code and “SERVICE REQUIRED” when the unit is turned ON. If more than one code is detected, they are displayed consecutively: E1 - Internal %RH/Temperature Sensor Failure: The User Interface Assembly is not receiving a good signal from the temperature/RH sensor.
  • Page 3 Integrated RH Sensor NOTE E1 Code Change: Beginning with serial number 212015A16241 the code was changed to V2.4. E1 and E8 will no longer occur when in External & Single Zone Mode. When in this mode combination, the dehumidifier will not check the inlet air condition and will not use the on board sensor board to sample the indoor temperature or humidity.

  • Page 4: E2, E3

    1. Use the color of the wire connected to the A, B, + and – (on the Model 76, the “+” and “-“ terminals are labeled “R/+” and “C/-“) terminals on both the base of the Model 76 and the dehumidifier User Interface Assembly to verify that they are wired correctly. Make sure the terminal screws on both the User Interface Assembly and the Model 76 base are tight.
  • Page 5 1. Use the ON/OFF button on the User Interface Assembly to turn the mode to OFF, then flip the ON/OFF toggle switch to OFF, to reset the diagnostic code. 2. Turn the ON/OFF toggle switch back ON. With the mode still OFF, Press and hold the MODE button and ON/OFF button to enter the Installer Test Mode.
  • Page 6 to verify the performance of the refrigeration system before leaving. If it still does not start, continue to the next step (d.). • If none were disconnected, continue to the next step (d.). d. Turn the ON/OFF toggle switch back ON. With the side panel still off, stay clear of the fan motor and repeat steps 2 and 3 above.
  • Page 7 a. If applicable, disconnect the duct from the discharge of the dehumidifier. Verify that the flap damper on the outlet of the dehumidifier opens/closes freely. b. Verify that there is not a lengthy amount of ductwork (more than 50 feet) attached to the inlet side, that the ductwork is free of obstructions and kinks and that the filter is clean –...

  • Page 8: E5, E6

    and suction line temperature. If the suction line temperature is not within a few degrees of the inlet air temperature, allow the unit to sit for at least one hour and then recheck. If cycled too rapidly, the suction line will not have adequate time to reach room conditions.

  • Page 9: E7, E8

    1. Leave the unit ON with the code showing. It will self-correct without having to turn the unit OFF to reset when the source that initiated the code has been repaired. 2. If a float switch is installed, drain any water out of the secondary drain pan. 3.
  • Page 10 2. Remove the ODT Sensor terminal and measure the resistance across the terminals to make sure it is in the range shown in the table below depending on the temperature outside. If the sensor is shorted (zero resistance) or open (infinite resistance), replace the outdoor temperature sensor (8052).

  • Page 11: Verifying Capacity

    8. Find the inlet air moisture content in Graph 1 below. Locate the inlet air temperature at the bottom of the graph and draw a straight line up until you meet the inlet air RH curve then read the moisture content at the left (1.31 ppd/CFM @ 80°, 60% RH for Model 1830 example shown). 11 |...
  • Page 12 Graph 1 70% RH 65% RH Inlet Air Moisture Content 1.65 1.55 60% RH 1.45 55% RH 1.35 50% RH 1.25 1.15 45% RH 1.05 40% RH 0.95 0.85 0.75 0.65 Inlet Air Temperature (°F) 12 | P a g e...
  • Page 13 9. Move a temperature/humidity measuring instrument to the outlet of the dehumidifier. 10. Allow time for the measuring instrument to get a good, stable reading. 11. Record the outlet air temperature and RH. 12. Find the outlet air moisture content in Graph 2 below. Locate the outlet air temperature at the bottom of the curve and draw a straight line up until you meet the outlet air RH curve then read the moisture content where the two intersect at the left (.72 ppd/CFM @ 115°, 12% RH example shown).
  • Page 14 14. Compare the capacity to the approximate performance in the table below. Performance should be within about 20% of the capacity listed below due to the estimation of airflow through the unit: 1830 Capacity Inlet Air Temperature (°F) Inlet Air RH...
  • Page 15 WORKSHEET: Table 1 Table 2 Model 1830 Model 1850 Measured Static Pressure = ______”w.c. Static Airflow Static Airflow Pressure (CFM) Pressure (CFM) (“w.c.) (“w.c.) Airflow From Table 1 or 2 = ______CFM Graph 1 Moisture Into Dehumidifier 70% RH 65% RH 1.65...

  • Page 16: Water Leaks

    Water Leaks Water collects in the drain pan below the coils and is directed through the drain tube to the outlet at the outlet side of the dehumidifier. 1. Level the unit front to back, and side to side. Make sure any hard pipe or drain fittings are completely glued to the drain pan outlet.

  • Page 17: Circuit Breaker Trips

    8 amps at high load (i.e. hot and humid) conditions and less at low load conditions. The 1830 dehumidifier uses approximately 6 amps at high load and less at low load. If there are other electrical components that draw a lot of current connected to the same circuit breaker, the circuit may be overloaded and a new circuit should be run to serve the dehumidifier.

  • Page 18: Defrost, E8, Noise

    The graph below illustrates how the cost per pint of an 1830 significantly increases at a 40°F dew point. The addition of heat or dry outside air to these spaces during times when the incoming air is approximately at a 40° dew point can help reduce the indoor humidity.

  • Page 19: Parts Lists

    1830/1850 Parts List Part Description Part No. Part Description Part No. Filter 10” x 12” x 1” EZK 5443 Wire Harness, Power 5454 Internal Control Board 5444 Sensor, Low Temperature 5455 User Interface Assembly 5445 Sensor, High Temperature 5456 Wiring Access Door...
  • Page 20 1850F Parts List Part Description Part No. Part Description Part No. Filter 12” x 12” x 1” EZK 5499 Sensor, Low Temperature 5455 Internal Control Board 5444 Sensor, High Temperature 5456 User Interface Assembly 5445 Capacitor, 45MFD, 370VAC, 70pt/95pt 5458 Wiring Access Door 5446 Capacitor, 12MFD, 450VAC, 95pt...
  • Page 21 1870 Parts List Part Description Part No. Part Description Part No. Filter 14” x 19” x 1” EZK 5569 Wire Harness, Power 5454 Internal Control Board 5444 Sensor, Low Temperature 5455 User Interface Assembly 5445 Sensor, High Temperature 5456 Wiring Access Door 5446 Leveling Foot 5457...
  • Page 22 1870F Parts List Part Description Part No. Part Description Part No. Filter 16” x 19” x 1” EZK 5570 Sensor, Low Temperature 5455 Internal Control Board 5444 Sensor, High Temperature 5456 User Interface Assembly 5445 Capacitor, 50MFD, 370VAC 5594 Wiring Access Door 5446 Capacitor, 8MFD, 450VAC 5459...

  • Page 23: Electrical Schematics

    1830, 1850W & 1870W Wiring Diagrams 23 | P a g e...
  • Page 24 1850, 1850F, 1870, 1870F Wiring Diagrams 24 | P a g e...

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