noise in Fujitsu multi zone mini split
I recently had a multi-zone heat pump installed at our house 2 hours north of Toronto.
The 24k indoor head is approximately 30 ft from the 3 ton condenser and the 12k indoor head has a loop in the refrigerant lines for a total length of 18 ft.
The issue I’m having is the 12k unit makes significant noise when in standby or even turned off. The sound varies between a loud hum to a gurgling sound. It happens when the 24k unit and condenser are running. The 24k unit doesn’t exhibit the same issue.
The installer has tried multiple things to address the noise…checked charge, pressure, isolated the line sets with rubber dampers…but the noise persists. The 12k unit is installed in a bedroom and the condenser is located outside behind the indoor unit. The condenser is on a stand and not mounted to the house.
Do you have suggestions? What else can be check or adjusted? Am I correct in expecting the 12k unit to be silent when its not operating?
Thanks for your help
GBA Detail Library
A collection of one thousand construction details organized by climate and house part