Are you sure? The outdoor unit, like most mini-splits, comes loaded with refrigerant, but I have never seen a Mitsubishi (or Daikin or Fujitsu or...) with a charged line set.
| Refrigerant Charge | Pre-Charged For: 25' |
|---|
I can't exactly, but I know some heat pumps work by being on or off (duh...) and other fancier ones work at various levels. They can ramp up and start slow. The on/off variety tend to have a starting surge current that is quite high. I assume this messes with the efficiency to a noticable degree, but I've couldn't describe the physics going on in the compressor.
Or an 80*F day! It must turn off at some point
Okay. They mean the outside unit comes loaded with refrigerant, not the line set. In fact, most mini-splits don't come with a line set; we buy the copper lines, a 14/4 cable that connects the inside and outside units, as well as a few other odds and ends separately.
Great to know, thanks!
Before I bought my Senville Aura Arctic 24k, I considered the the Mr Cool DIY but you can’t custom fit the line sets and if you look at videos many have excess lineset coiled up behind or underneath. Just don’t think it looks professional. A few hundred dollars in tools allowed me to do a custom fit install which looks great and still cheaper than DIY series. Nevermind the condensation line in this pic, it’s going to be routed under the deck via PVC to run down the slope. Other benefit is I have all the tools to do another one which will be cheaper to install.
You don’t have to add refrigerant if the line set is under 25ft long. The outside unit comes with enough refrigerant to filll up to a 25’ line set. For my 24k pioneer it was 16ft.
Although the pre-refrigerant gas filled lines are a concern, the inside unit is more of a concern if shipped in a hot environment that raises the pressure on port sealing disks. There is a lot more refrigerant gas in the evaporator to expand at high temps during shipping.
Our Mitsubishi hyper heat unit NOT do that, and I'd be mad as a hornet if it did. Perhaps it doesn't have the cold climate package, but it operates just fine here in Maine. I think that heater turns itself on and off as needed. I have an Emporia Vue electricity monitor in that building, and often see that unit consuming only 14 watts of power, which I assume is used to keep the wifi dongle and IR receiver active. Even when running, I often see it down around 200 watts.
