Case study · Emergency repair

Emergency VRF Compressor Replacement – Gramercy, Manhattan

A rooftop VRF (variable refrigerant flow) system serving a Manhattan commercial building went down with a failed compressor. We recovered the refrigerant, swapped the compressor on the roof, and documented the job with photos.

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LocationCommercial building rooftop, Gramercy, Manhattan
EquipmentMulti-zone VRF outdoor unit
ProblemFailed compressor, emergency call
ServiceRefrigerant recovery, compressor replacement, startup and testing
RecoveryFinished Rooftop VRF outdoor unit with a refrigerant recovery machine and cylinder connected on the left, and the finished installation with panels back on and gauges attached on the right
Refrigerant recovery on the first evening (left) and the finished rooftop unit the next afternoon (right).

What we found

  • A failed compressor in the rooftop VRF outdoor unit, taking the system out of service.
  • Inverter control board and wiring inspected for related faults before the swap.

What we did

  • Recovered the refrigerant from the outdoor unit into a recovery cylinder.
  • Removed the failed compressor and set the replacement.
  • Brazed the connections under a nitrogen purge and pressure-tested the circuit.
  • Evacuated, recharged and verified operation with manifold gauges.

Recovery and compressor swap

Rooftop VRF outdoor unit with a recovery machine, recovery cylinder and hoses connected
Recovery machine and cylinder connected to the outdoor unit.
VRF outdoor unit with panels open, a digital manifold gauge set, a nitrogen cylinder and a compressor on the platform
Digital manifold and nitrogen connected during the compressor swap.
Compressor next to an open VRF outdoor unit on a rooftop platform
Compressor next to the open outdoor unit.

Control board inspection

Inverter control board and wiring inside an open VRF outdoor unit
Inverter control board and wiring inspected.
Control board with a status display inside an open VRF outdoor unit
Control board status display during diagnostics.

Our recommendation: service rooftop VRF before it fails

Compressors rarely fail without warning. Rising current draw, oil and charge problems and repeat board faults show up on a planned maintenance visit long before they become a shutdown.

We can set up scheduled VRF maintenance for your roof, with a written photo report after each visit. If a unit is already down, call us at (646) 946-5584.

Request VRF service

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