Trane VAL08678 5/8" 3 Ton R410A Thermostatic Expansion Valve

The Trane VAL08678 5/8" 3 Ton R410A Thermostatic Expansion Valve is a Trane thermostat for HVAC repair and replacement work. Use it when the part number VAL08678 and the listed specifications match the equipment being serviced.

VAL08678 is an official OEM 5/8" 3 Ton R410A Thermostatic Expansion Valve for Trane HVAC equipment.

Key Specs

• Voltage: 24V
• Product Type: Thermostat

Fitment Notes

Captured equipment fit data references models including 4TGB3F42A1000AA, 4TXCC043BC3HCBA. Verify the complete unit model and service manual before installation.

Expert Verdict

Reviewed by the SuperArbor Pro Desk: choose this part when the existing component label and unit documentation match VAL08678 and the spec set above. It is best suited for targeted HVAC service repairs where exact fitment matters more than broad universal compatibility.

FAQs

What is the Trane VAL08678 used for?

It is a thermostat for compatible Trane HVAC equipment. Match the part number VAL08678 and the equipment service literature before ordering or installing.

Which specs should I verify before purchase?

Verify the spec set shown for this part: Voltage: 24V; Product Type: Thermostat. The replacement should match the existing component and the unit documentation.

Does the electrical rating need to match exactly?

Yes. Confirm voltage rating 24V against the failed component label. Do not substitute a different rating unless the equipment manufacturer allows it.

Which equipment models are referenced in the fit data?

Captured fit data references models such as 4TGB3F42A1000AA, 4TXCC043BC3HCBA. Treat this as a fitment aid and verify the complete model list in the equipment documentation.

Who should install this HVAC component?

A qualified HVAC technician should install and test the thermostat. Disconnect power first, follow lockout procedures, and confirm safe operation after replacement.

Safety and Installation Notes

Disconnect power before service. HVAC electrical and combustion-related components should be installed and tested by a qualified technician. After installation, confirm wiring, mounting, airflow or fluid routing as applicable, and normal system operation.