Equipment
- Fujitsu multi-zone heat pump, outdoor unit AOU36RLXFZ1
- Four indoor wall units
- R-410A
Fujitsu four-zone mini split recharge in Palo Alto
Problem: A Palo Alto customer called because their Fujitsu mini split wouldn’t cool and wouldn’t heat. One outdoor unit runs four indoor units. A different company had added refrigerant before, and the customer still had no cooling after that.
Diagnostics: Our technician put gauges on the outdoor unit. The low side read 16 psi, and the system was empty. With no refrigerant, a heat pump can’t move heat in either direction. That’s why cooling and heating stopped together.
Solution: We recovered what was left in the system, pulled a vacuum and pressure tested it. During the vacuum the micron gauge read 498 microns. Then we charged new R-410A by weight. The scale shows 7 lb 1 oz taken off the cylinder, the same as the factory charge on the nameplate.
Result: Cooling and heating both work again. Our technician checked both modes at the indoor units after the charge. The leak was not repaired on this visit. Fixing it means re-flaring all the connections. Until that’s done, this charge can leak out too.
If your mini split needs refrigerant again, the gas went somewhere. Ask for the old charge to be recovered and a vacuum pulled, then plan the leak repair.
For Fujitsu mini-split service in Palo Alto, CA, see our repair service page.
Photos
