Daikin-McQuay 031784700 Power Head

The Daikin-McQuay 031784700 Power Head is a precision-engineered TXV power element designed for high-performance refrigerant flow control in commercial HVAC systems. Featuring a 5-foot capillary tube and a durable sensing bulb, this thermostatic expansion valve component ensures accurate superheat adjustment and efficient evaporator coil operation. This OEM replacement part is critical for maintaining system pressure balance and preventing liquid slugging in the compressor. Engineered for compatibility with specific Daikin chillers and McQuay air handling units, the 031784700 utilizes a cross-ambient charge to maintain responsiveness across a broad range of operating conditions. Contractors should verify the refrigerant type and flange configuration to ensure a seamless drop-in fit. By replacing a fatigued power head assembly with this genuine Daikin 031784700, technicians can restore optimal thermal efficiency and prevent premature system cycling in demanding mechanical environments.

• Precise Superheat Regulation: Maintains consistent evaporator performance by accurately modulating refrigerant flow.
• Durable Capillary Construction: The 5' capillary lead provides flexibility for remote sensing bulb placement in confined mechanical spaces.
• OEM Standards: Manufactured to Daikin-McQuay specifications to ensure direct compatibility and long-term mechanical reliability.
• System Protection: Helps mitigate the risk of compressor damage by preventing improper liquid feedback through the suction line.

What is the primary cause of power head failure in these units?
Most failures result from a loss of the internal sensing charge due to a rupture in the capillary tube or diaphragm fatigue, which prevents the TXV from opening properly.

Is this power head compatible with R-410A and R-22 systems?
Compatibility depends on the specific valve body and internal spring rate. Technicians must check the MOP (Maximum Operating Pressure) settings on the 031784700 to ensure it matches the system's refrigerant profile.

Does this assembly include the replacement gasket?
This part number typically refers to the power element and capillary. We recommend sourcing new flange gaskets when opening the refrigeration circuit to ensure a leak-free seal.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.