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Where do i find the expansion valve on a 3.5 ton trane air handler. Model no of the trane air handler is: 2TEC3F42C1000AA

I looked on the evaporator core trace the big line, just could not find the expansion valve. can it be hidden somewhere?

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Heat pump units have check valves and/or flow restrictors, maybe an expansion valve in each, the condensor and evaporator, you cant find the expansion valve, then there should be some sort of distributor, small copper lines into the coils.

Posted on Apr 30, 2015

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The TXV (thermostatic expansion valve) is always at the end of the high pressure liquid line as it enters the evaporator. This is the small line. The outlet of the TXV will usually have 4, 6 or 8 smaller lines feeding proportional portions of the evaporator coil. You have to remove the cover of the evaporator to access it.

Some units do not use a TXV, so you may have a 'fixed restrictor' instead. It too is located where above described.

Posted on Apr 28, 2015

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