Daikin DX14XA090 - User Manual

Questions and Answers

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Mr. Mathew ZimmermanAug 11, 2025
How to fix low suction pressure in Daikin Air Conditioner?
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  Melanie LamAug 11, 2025
  If the suction pressure is low on your Daikin Air Conditioner, start by checking if the liquid line valve is closed and open it. If that's not the issue, the liquid line might be restricted, so replace the filter-dryer. Other potential causes include a thermal expansion valve bulb that has lost its charge (replace the valve if no liquid refrigerant goes through it when detached), a system low on refrigerant (test for leaks and add refrigerant), dirty filters (clean or replace them), a frosted coil (defrost and clean the coil, and clean/replace filters again), flash gas in the liquid line (check liquid line size), or inadequate air through the evaporator (increase blower speed).
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Stephanie HarveyAug 16, 2025
What to do if Daikin Air Conditioner has low head pressure?
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  Miguel GomezAug 17, 2025
  If you notice low head pressure in your Daikin Air Conditioner, it could be due to the system being low on refrigerant. Charge the system until the sight glass is clear of bubbles. Another possible cause is a broken compressor valve, which would require replacing the compressor.
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Chelsea VincentAug 22, 2025
What to do if my Daikin Air Conditioner compressor will not start?
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  shawnmillerAug 22, 2025
  If your Daikin Air Conditioner compressor won't start, first ensure the disconnect switch is closed, if your unit is equipped with one. Then, check for blown fuses and replace them if necessary, addressing the cause of the failure. Make sure the thermostat is set to a lower temperature and the selector switch is in the 'Cool' position. Finally, inspect all electrical connections and replace any burned-out contactor or relay coils.
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Deanna MurrayAug 28, 2025
Why is the suction pressure high in my Daikin Air Conditioner?
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  avilashannonAug 28, 2025
  If the suction pressure is high in your Daikin Air Conditioner, it could be due to several reasons. The expansion valve might be stuck open, in which case you should try to correct the valve action or replace it. Alternatively, the expansion valve bulb may not be in contact with the suction line; ensure it is securely fastened. A leaking or broken suction and/or discharge valve can also cause this issue, requiring you to replace the compressor.
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ubeanSep 4, 2025
What causes high head pressure in my Daikin Air Conditioner?
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  Jose HuntSep 4, 2025
  If you're experiencing high head pressure in your Daikin Air Conditioner, it could be due to a few reasons. First, there might be an excessive charge of refrigerant in the system; purge or pump down the excessive charge. Second, ensure there's an adequate supply of air across the condenser coil and that the coil isn't fouled or air is not re-circulating. Lastly, non-condensate gases in the system can cause this issue; purge these gases and recharge the system if needed.

Summary

Important Safety Instructions

General Safety Warnings

Key safety warnings and precautions for personnel and equipment operation.

Installation Instructions

Rigging

Safe Refrigerant Handling

Precautions for safely handling refrigerants, including personal protection and EPA regulations.

Refrigerant Lines

System Evacuation

System Evacuation Procedure

Detailed steps for evacuating the refrigerant system to remove moisture and non-condensables.

Electrical Connections

High Voltage Safety

Critical safety warnings regarding high voltage and power sources.

Overcurrent Protection

Wiring Connections

System Start Up

Final Charge Adjustment

Procedure for adjusting refrigerant charge based on temperature and subcooling.

Expansion Valve System

Expansion Valve Indoors

Troubleshooting

Troubleshooting Analysis Table

Analysis of common complaints, probable causes, and recommended remedies.

Wiring Diagram

Daikin DX14XA090 Specifications

General

Type	Heat Pump
Cooling Capacity (tons)	7.5
Cooling Capacity (BTU)	90000
Heating Capacity (tons)	7.5
SEER Rating	14
HSPF Rating	8.2
Refrigerant	R-410A
Compressor Type	Scroll
Voltage	208/230
Phase	1
Heating Capacity (BTU)	90000
Power Supply	208/230V