allowing for precise custom-length applications across various boiler and water heater enclosures

keeping the refrigerant cycle balanced and your subcooling levels within spec

High close-off models like the AH13B020 are designated by the 'H' in the prefix and are specifically rated for higher differential pressures (up to 75 psi depending on CV) compared to the standard AG series

Motor Protection: Integrated magnetic clutch provides constant pressure while preventing mechanical failure during end-of-stroke stall

Robust Construction: Featuring Totally Enclosed Air Over (TEAO) protection and rain-shielded housing for reliable operation in moist evaporator conditions

Daikin-McQuay 4009542 Circuit Board 321142-301 allowing for precise custom-length applicationsFor service professionals managing a "U4" or "E30" error code on high performance split systems, the Daikin McQuay 4009542 Circuit Board is the precise field ready solution. This genuine OEM replacement board (sometimes listed as PCB CTXS07LVJU) is the primary command module for indoor units, coordinating the electronic expansion valve (EEV) and fan motor communication pulses for stable refrigerant flow. As an official Daikin HVAC part, it ensures