Daikin-McQuay 910198401 Reversing Valve

Maintain peak system performance with the Daikin-McQuay 910198401 Reversing Valve, a high-reliability component engineered for 4-ton heat pump applications. This OEM HVAC replacement part is the functional successor to the legacy McQuay 910110422, ensuring seamless mechanical integration without requiring extensive manifold modifications. Designed for dual-refrigerant compatibility, it handles the high-pressure demands of R410A systems while maintaining backward compatibility for R22 retrofits. This pilot-operated 4-way valve is essential for shifting refrigerant flow between heating and cooling cycles, preventing internal bypass leaks that diminish compressor efficiency. For technicians, the valve’s robust slide-block construction minimizes the risk of sticking in mid-position, a common failure point that leads to "lukewarm air" calls. When field-installing this heat pump reversing valve, always remove the solenoid coil before brazing and use individual heat-sink wraps on each port to protect the internal seals from thermal damage. Built to withstand industrial-grade stressors, this valve ensures refrigerant flow control remains precise under varied ambient conditions.

• Direct OEM Replacement: Replaces obsolete McQuay part number 910110422 for a perfect 4-ton fit.
• Multi-Refrigerant Versatility: Fully rated for both R22 and high-pressure R410A environments.
• Operational Precision: Features high-grade slide materials to ensure reliable shifting between cooling and heating modes.
• System Longevity: Prevents internal refrigerant migration, protecting the compressor from unnecessary wear.

Is this valve a drop-in replacement for the 910110422?
Yes, the 910198401 is the official direct replacement for the 910110422. It matches the original technical specifications and footprint for 4-ton Daikin and McQuay units.

Can I use my existing solenoid coil with this new valve?
It is standard practice to verify the voltage and mount of your existing coil. If the old coil shows any signs of swelling or electrical failure, a new matching solenoid is recommended to ensure the pilot valve actuates correctly.

How do I prevent "burning" the valve during the brazing process?
Experienced contractors use wet rags or heat-absorbing paste on each of the four tubes. Braze the middle suction line first to stabilize the valve, and always cool each joint immediately after brazing before moving to the next.

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.