September 1, 2017: pumped down condensing unit on roof. Removed and replaced thermostatic expansion valve, using torch and brazing alloy. Attached sensing bulb outside of case. Evacuated low side to deep vacuum. Tested operation. ambient: 77.liquid line: 85 .suction line: 46 .metering device: TXV . Suction pressure: 119(40).head pressure: 280(92) . Return air: 72 .supply air: 55 .wet bulb: 61 .