331709-752 – EXPANSION VALVE (CHATLEFF/BRAZE, R22, 3.5-4 TON)

Carrier thermostatic expansion valve kit. The valve itself is a Danfoss-built TR 6 carrying OEM number EA36YD046, rated 3.60 TR, and it is approved for both R-22 and R-407C. Supplied as a kit with the sensing bulb, insulation sleeve, a marked bulb strap, zip ties and a teflon washer.

Specifications

Before you order

Everything above is read directly off the valve’s own diaphragm label in the manufacturer photo, not from a stock record. That label is also what confirms the cross-reference: this valve is Carrier EA36YD046 sold under service number 331709-752.

On the tonnage: the valve is rated 3.60 TR and is applied to 3.5 and 4 ton equipment. A TXV modulates on superheat, so manufacturers routinely fit one valve across more than one system size — a difference between the valve rating and the unit tonnage is normal, not an error. Match by part number against the valve you are removing.

The R-407C approval is worth knowing if you are servicing a retrofitted system, since many R-22 valves are not rated for it.

Specs

• BrandCarrier
• OEM number on the valveEA36YD046
• Valve seriesTR 6
• Danfoss codes067U3259 / 067U3205
• RefrigerantR-22 and R-407C
• Valve rating3.60 TR
• Application3.5 to 4 ton
• Maximum working pressure711 psig (PS 49.0 bar)
• ConnectionsChatleff / braze
• ApprovalsUL listed refrigerant valve
• OriginMade in Mexico

Cross-reference numbers

This part replaces the following OEM and aftermarket numbers:

• EA36YD046
• 331709752

Not sure if your number matches? Call (214) 340-9421 or bring the old part in — bench-testing is free.

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.