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A crane is used here to lift a new condenser coil to a roof top. The old coil was leaking and could no longer be repaired. The process involved recovering all the refrigerant from the Trane roof top unit. More details below.
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A crane is used here to lift a new condenser coil to a roof top. The old coil was leaking and could no longer be repaired. The process involved recovering all the refrigerant from the Trane roof top unit. The roof top unit was then partially disassembled and the old coil cut out from the system taking great care and planning to ensure the new coil could be retrofitted to the old refrigeration piping system. Good planning and skilled HVAC Tech's make the jobs go smoothly and make the replacement seem easy especially to the customer.
The system holds approximately sixty pounds of R-22 refrigerant. The E.P.A. in accordance with the Montreal Protocol requires the system be repaired if it leaks more than fifty pounds of refrigerant a year. The solution here was to replace the coil rather than try to repair the old coil. After brazing in a new coil and filter driers the system is leak tested with nitrogen to make sure all solder joints have integrity and will not leak when the refrigerant is charged into the system. After all checks have been made the unit is reassembled and a vacuum pump is hooked up to the refrigeration system. A vacuum is pulled and then nitrogen is reintroduced to the system. The nitrogen is released and another vacuum is pulled on the system. The is repeated one more time. This is called a triple evacuation and ensures that all moisture is removed from the system before the unit is charged with refrigerant.
