Pentair Thermostatic Expansion Valve | UltraTemp Heat Pump | 473787Z
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- SKU:
- 473787Z
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About This Item
The Pentair Thermostatic Expansion Valve (473787Z) is the OEM replacement expansion valve for the UltraTemp Heat Pump series, specifically engineered for Models 120, 120C, 120Q, and 90I.
⚠️ IMPORTANT: LICENSED PROFESSIONAL INSTALLATION REQUIRED
Heat pump refrigerant systems require EPA Section 608 certification to service legally. Do not attempt to service refrigerant circuits without proper certification. This component must be installed by a licensed pool professional or qualified HVAC technician.
The thermostatic expansion valve (TXV) regulates refrigerant flow into the evaporator coil, metering the precise volume of refrigerant required to maintain efficient heat transfer. A failed or out-of-calibration TXV results in reduced heating output, compressor strain, or complete loss of heating function. Replacing it with the correct OEM part restores the refrigerant circuit to factory-specified operating parameters.
Specifications
| Pentair Part Number | 473787Z |
| Part Name | Thermostatic Expansion Valve |
| Quantity Included | Each |
Fits Into
| Brand | Equipment Line | Model / Part Number | Notes |
| Pentair | UltraTemp Heat Pump | 120 | Fits Models 120, 120C, 120Q, 90I |
| Pentair | UltraTemp Heat Pump | 120C | Fits Models 120, 120C, 120Q, 90I |
| Pentair | UltraTemp Heat Pump | 120Q | Fits Models 120, 120C, 120Q, 90I |
| Pentair | UltraTemp Heat Pump | 90I | Fits Models 120, 120C, 120Q, 90I |
Compatibility is based on Pentair parts documentation and available OEM records. This is not an exhaustive list. For certainty, verify the part number in your equipment's manual or on the original part itself before ordering.
Pro Tip
Before ordering, confirm your UltraTemp model number from the data plate on the unit — not from the original purchase receipt, which may not reflect a model revision. TXV replacement on a heat pump involves recovering and recharging refrigerant; this work requires EPA Section 608 certification. Have the part in hand before scheduling your technician to minimize equipment downtime.
