Arrived at the job for a new Fujitsu installation. Turned off the power and disconnected all wiring to the unit. Next we removed all the copper, exhaust and other miscellaneous items. We brought the new furnace up to the attic and fitted it in place. We connected the ac coil cabinet. We re-routed and connected all electrical wiring including the low voltage. We reassembled all the copper lines, purged and checked for leaks. Installed the exhaust lines and taped the joints. We fired up the Heat pum unit and allowed it to run and cycle for a few minutes. Heat pump was running excellent. Job completed.