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Aprilaire 1730A Troubleshooting Manual

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See also: Owner's Manual , Instruction and Installation Manual
Aprilaire Dehumidifier Troubleshooting Manual

Table of Contents

Troubleshooting Fault Codes ....................................................................................................................... 3
Troubleshooting Dehumidifier ........................................................................................................... 4
Troubleshooting Model 76 ................................................................................................................. 6
Troubleshooting Power Circuit .................................................................................................................... 8
Troubleshooting Fan Circuit ................................................................................................................ 9
Troubleshooting Compressor Circuit ................................................................................................. 10
Troubleshooting Defrost Switch ....................................................................................................... 11
Verifying Capacity ............................................................................................................................ 11
Water Leaks ..................................................................................................................................... 14
Service Parts .................................................................................................................................... 15
Electrical Schematic ......................................................................................................................... 16
Instruments you will need to complete troubleshooting:
1. Digital Multi-Meter (DMM) capability of measuring
 AC and DC voltage
 Resistance
 Capacitance
2. Temperature Meter for air temperature
3. Humidity Meter for air RH
Minimum tools needed to complete troubleshooting:
1. Phillips screwdriver (#2) or drill driver with #2 Phillips bit
2. Small (terminal) flat head screwdriver
3. Needle nose pliers
4. Level (to troubleshoot water leak claims)
Note: Do not hook up refrigeration gauges to the dehumidifier. Use of gauges will result in
refrigerant loss and performance loss.
1 |
P a g e
Model 1730A

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Summary of Contents for Aprilaire 1730A

  • Page 1: Table Of Contents

    Aprilaire Dehumidifier Troubleshooting Manual Model 1730A Table of Contents Troubleshooting Fault Codes ........................3 Troubleshooting Dehumidifier ......................4 Troubleshooting Model 76 ......................... 6 Troubleshooting Power Circuit ........................8 Troubleshooting Fan Circuit ........................ 9 Troubleshooting Compressor Circuit ....................10 Troubleshooting Defrost Switch ....................... 11 Verifying Capacity ..........................
  • Page 2 Float Switch Frost Switch Terminals Terminals Run Capacitor High Temp Terminals Remote Terminals HVAC Terminals Amber LED’s Compressor Terminals Red & Green LED’s Capacitor 120 VAC Inputs Terminals Transformer 24 VAC Inputs Electrical Panel Control Board P a g e...

  • Page 3: Troubleshooting Fault Codes

    Troubleshooting Fault Codes A dehumidifier fault can be indicated by the red Fault LED. A Model 75/76 external control error is indicated by the Er code on the Model 75/76 screen. Note: Observing the amber LED’s is only possible if the dehumidifier cover is removed. Red FAULT LED Open float switch or high temperature switch.

  • Page 4: Troubleshooting Dehumidifier

    Troubleshooting Dehumidifier 1. Verify that no field modifications have been made to the dehumidifier electrical system. 2. Remove the G-STAT, R-HVAC, G-HVAC terminal block. 3. Place a jumper between the FLOAT SWITCH terminals. 4. Place a jumper between the REMOTE terminals. 5.
  • Page 5 1. Turn the dehumidifier off and reconnect the control to the REMOTE terminals. 2. Turn the ON/OFF switch to the ON position, make a call for dehumidification using the external control (if using an Aprilaire Manual Dehumidistat turn knob to ON), begin a timer, and verify the following happen immediately: a.

  • Page 6: Troubleshooting Model 76

    Troubleshooting Model 75/76 The Model 75/76 requires 24VAC to the R and C terminals on the control. This can be provided by the two yellow 24VAC leads from the 1730A, a 24VAC external transformer, or the furnace/air handler R and C terminals.
  • Page 7 Control Does Not Turn On Dehumidifier Outputs 1. Remove the cover from the control and verify wiring and connections between the DH terminals on the control and the REMOTE terminals on the dehumidifier control board. 2. Replace the control cover, turn the dehumidifier on and use the control to make a call for dehumidification.

  • Page 8: Troubleshooting Power Circuit

    Troubleshooting Power Circuit 1. Turn the ON/OFF switch OFF and remove the REMOTE terminal block. 2. Remove the dehumidifier cover. 3. Remove the electrical panel. 4. Check all electrical connections using wire color and printing on the control board to verify proper placement and verify all connections are fully seated and secure.

  • Page 9: Troubleshooting Fan Circuit

    Troubleshooting Fan Circuit 1. Turn the ON/OFF switch OFF and put a jumper between the REMOTE terminals. 2. Remove the dehumidifier cover. 3. Remove the electrical panel. 4. Check all electrical connections using wire color and printing on the control board to verify proper placement and verify all connections are fully seated and secure.

  • Page 10: Troubleshooting Compressor Circuit

    Troubleshooting Compressor Circuit 1. Turn ON/OFF switch OFF and put jumper between REMOTE terminals. 2. Remove the dehumidifier cover. 3. Remove the electrical panel. 4. Remove the compressor cap. 5. Check all electrical connections using wire color and printing on the control board to verify proper placement and verify all connections are fully seated and secure.

  • Page 11: Troubleshooting Defrost Switch

    13. If the inlet air conditions are not within those listed on the table, contact Aprilaire Technical Support Monday through Friday from 7:00 a.m. to 5:00 p.m. CST at (800) 334-6011 for assistance in determining performance.
  • Page 12 2. Verify that the ductwork is free of obstructions and kinks and that the filter is clean. Remove the filter for this test if dirty. 3. Ensure all panels are in place and assembled with screws. DO NOT REMOVE PANELS DURING THIS TEST.
  • Page 13 11. Move the temperature/humidity measuring instrument to the discharge of the dehumidifier. 12. Allow time for the measuring instrument to get a good, stable reading. 13. Record the dry-bulb temperature and RH of the discharge air. 14. Find the discharge air moisture content on the graph below. Locate the discharge air temperature at the bottom of the graph and draw a straight line up until you meet the discharge air RH curve then read the moisture content at the left (128 PPD @ 100°, 21% RH example shown).

  • Page 14: Water Leaks

    Water Leaks Water collects in the drain pan below the coils and is directed through the drain tube to the drain outlet on the inlet side of the dehumidifier. 1. Level the unit front to back, and side to side. The unit may be installed with a slight slope toward the drain outlet, but must be level side to side.

  • Page 15: Service Parts

    1730A Parts List 15 | P a g e...

  • Page 16: Electrical Schematic

    1730A Wiring Schematic 16 | P a g e...

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