669567R – EXPANSION VALVE (4 TON, R410A)

Nortek thermal expansion valve for R-410A systems, rated 4.00 TR — four tons of refrigeration. It is a Danfoss-built TR 6 valve carrying Danfoss code 067U3031, and it is UL listed as a refrigerant valve. Nortek sells it as the service number 669567R.

Specifications

Before you order

A note on the tonnage, because you will find this contradicted elsewhere. Several large retailers list 669567R as a 3.5 ton valve, and at least one of them lists 669568R as the 4 ton. The valve itself disagrees with them: the diaphragm label is printed 669567 / R410A / 4.00 TR, and TR is tons of refrigeration. We go with what is stamped on the part. If you are matching to a 3.5 ton system, read the label on the valve you are pulling out rather than trusting a listing title — ours included.

Nortek does not publish a public specification page for this number. Everything above is read directly off the manufacturer’s own product photography of the valve label, not from a stock record.

Specs

• ManufacturerNortek (Nordyne)
• Valve seriesTR 6
• Danfoss code067U3031
• RefrigerantR-410A
• Capacity4.00 TR (4 ton)
• Maximum working pressure711 psig (PS 49.0 bar)
• ApprovalsUL listed refrigerant valve
• Service number669567R (base number 669567)

Does the TXV have to match my tonnage exactly?

No, and this trips people up. Manufacturers frequently oversize the valve on purpose and let it do its job - a TXV modulates on superheat, metering against the pressure and temperature it actually sees at the bulb, so one valve commonly covers more than one system size. That is why you will see the same part number applied to a 4 ton and a 5 ton unit, and why a distributor may list a valve as 5 ton while the equipment it ships on is smaller. Neither listing is wrong. Match by part number against the valve you are removing or the unit's parts list, not by comparing tonnage figures between listings.

How do I pick the right TXV?

Four things, in this order: refrigerant, tonnage, equalizer type, connection style. The charge sealed in the power head is refrigerant specific, so an R-22 or R-410A valve will not control correctly on R-454B and there is no adapter that fixes that. Match nominal tonnage to the evaporator coil, not to the condenser. An oversized valve hunts, which shows up as superheat swinging 5 to 15 degrees, a coil that frosts, and floodback to the compressor.

Internal or external equalizer - how do I tell?

Look at the coil inlet. If there is a brass distributor with several small tubes fanning out into the coil, you need an externally equalized valve. Sporlan's own literature says the external equalizer must be used on evaporators that employ a refrigerant distributor, because the distributor drops pressure and an internal valve then reads the wrong reference and starves the coil. Almost every residential A-coil has a distributor.

Chatleff, braze, or flare - are those interchangeable?

Not without the correct adapter. Chatleff is a threaded fitting with a captured brass nut and a replaceable gasket, common on Goodman and Amana coils. ODF solder means you braze it in. SAE flare is a 45 degree seat. Bring the old valve and the distributor nut in and we will match the body and the fitting instead of guessing off a photo.

Anything special about brazing one in?

Wrap the body and the bulb in a wet rag or heat block putty, or pull the bulb off the line entirely, and flow nitrogen at 3 to 5 SCFH while you braze. TXV bodies are often brass, which melts before copper does.