True Reach-In Not Cooling – Leaky Evaporator
True T49 Cooler Troubleshooting – Leaking at Evaporator
Arrived to find the box temperature at 60*F. Check temperature control and it checked out fine. Pulled off the front grille and found the discharge line was not hot. Checked the amps on the compressor, it was pulling 4.5 amps, which was lower than normal. These were indications that the unit was probably low on refrigerant. The refrigerant system is sealed from factory and did not have any service access valves. Installed bolt on access valves to the high side and low side of the system. Checked pressures with stubby gauges to read pressures. The suction pressure was in a vacuum and the high side pressure was very low. Added 100 psig of nitrogen into system in an attempt locate the leak. Heard nitrogen leaking at evaporator u-bend. Confirmed leak and location with bubbles. Purged the nitrogen charge and pulled out my turbo torch. Removed the bolt access valves and replaced with permanent soldered fittings. Patched the leaky evaporator with solder and replaced the liquid line drier. Doubled check solder joints for leaks, pulled a vacuum, and then weighed in 9 oz. of R134 refrigerant. Started the unit back up and tested the operation. Refrigerant pressures were approximately 130 psig on the high side and 18 psig on the low. Allowed the unit to run until it cycled off at 34*F. No other issues found and explained services to client.
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