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Carrier 331709-790 Kit Thermal Expansion Valve (Txv)

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Special Price $267.00 Regular Price $296.37
In stock
SKU
331709-790
The Carrier 331709-790 Kit is a Carrier air conditioning unit’s thermal expansion valve (TXV) replacement kit. This is a finger-sized component that regulates the flow of refrigerant all through the system; it is a pressure-controlled valve. The low pressure causes the TXV to operate partially wherein a different flow is produced. Such a level of control provides the better cooling and the overall efficiency of the system. Replacing a bad TXV can help you fix the problem of refrigerant flow and cool working of your Carrier air conditioner.
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HVAC Controls & Electrical, Valves
Manufacturer:
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Specifications

  • Length: 8 "
  • Width: 5.5 "
  • Height: 5 "
  • Weight: 0.86lbs
  • Product Type: Thermal Expansion
Manufacturer Name: Carrier
Product Number: 331709-790
OEM Part Number: 331709-790
Product Description: Kit Txv
Weight:0.86lbs/390.09g

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Customer Questions
What maintenance is required for the Carrier 331709-790 Thermal Expansion Valve Kit?

Inspect valve and sensing bulb for secure mounting and refrigerant leaks. Ensure proper superheat calibration and clean refrigerant lines to prevent blockage. Check insulation and system pressures during routine HVAC servicing for accuracy.

What are common issues with the Carrier 331709-790 Thermal Expansion Valve Kit?

  • Nuisance tripping due to incorrect superheat adjustment.
  • Refrigerant leakage at sensing bulb or valve connections.
  • Restricted flow from debris or moisture contamination in system.
  • Inconsistent cooling performance caused by improper installation or calibration.

Installation Steps

Step 1: Isolate power and recover refrigerant from system using proper recovery unit.

Step 2: Remove access panel and disconnect old thermal expansion valve, noting bulb placement.

Step 3: Braze new valve into liquid line using nitrogen purge to prevent oxidation.

Step 4: Reinstall sensing bulb firmly on suction line and insulate properly.

Step 5: Evacuate system to deep vacuum and check for leaks.

Step 6: Recharge refrigerant per manufacturer specs and verify superheat.