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Re: TXV Expansion valve insulation
The bulb is just a temperature sensor clamped to the tail of the evaporator coil. The portion of the suction line exposed outside the cabinet (not the usual method) should be insulated to prevent condensation. If you are not getting a good thermal bond, the valve could malfunction and over or under feed the coil which would effect the operation and overall unit efficiency. Insulation would be a good thing at the bulb in that respect.
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