Mini-spLits

Status
Not open for further replies.
G

guschash

Senior Member
Location
Ohio
Can I put two mini-spLits on one circuit if they only are drawing 4 1/2 Amps a piece? This is a commercial building and owner wants to add another unit on the roof. Since they are right next to each other I was wonder if I do could put new one on same circuit. When I wired the first up A/C guy said he needed 30 amp breaker and #10 wire for the unit but if they draw only 4 1/2 amps ?
 
Last edited by a moderator:
Remove the existing unit and install a multi-unit like a "Daikin". that uses one outside unit and up to four inside units.
 
guschash said:
Can I put two mini-spits on one circuit if they only are drawing 4 1/2 Amps a piece? This is a commercial building and owner wants to add another unit on the roof. Since they are right next to each other I was wonder if I do could put new one on same circuit.
Click to expand...
If you use fusible disconnects, and tap from one to the other, why not?

guschash said:
When I wired the first up A/C guy said he needed 30 amp breaker and #10 wire for the unit but if they draw only 4 1/2 amps ?
Click to expand...
That's exactly why I don't listen to HVAC thugs.
I tell them to give me the nameplate info.
 
And if the mini split asks for class H fuses:
From Graingers website :
Fast-acting, non-indicating UL Class H and K5 fuses are for general purpose use in existing installations that require a high-sensitivity, fast-blow fuse. These fuses are highly sensitive to changes in current flow and don't tolerate temporary overload currents or power surges, so they open within seconds of being exposed to overloads and short circuits. UL Class H and K5 fuses are used as replacement fuses for overcurrent protection in HVAC installations. So use Bussman NON fuses or compatible fuse type.
 
Why wait for the 2nd name plate if it the same unit? Why can't the OP use the existing disconnect as a Jbox and feed the 2nd unit as well? Am I having a brain fart?
 
Back to the OP: it is very unlikely that the unit calls for a 30A OCPD but only draws 4.5A max.

If you measured the unit drawing 4.5A, but the nameplate says 30A OCPD, then it is likely that the unit modulates and was not calling for much power when you measured it.

As @wwhitney asked, what is the MAX OCPD and MIN CIRICUIT AMPACITY on the device nameplate. Also note if MAX OCPD is MAX FUSE or MAX BREAKER. The answer to 'what is on the nameplate' will tell you your options going forward.

-Jon
 
Ponchik said:
Why wait for the 2nd name plate if it the same unit? Why can't the OP use the existing disconnect as a Jbox and feed the 2nd unit as well? Am I having a brain fart?
Click to expand...

Because both units will be connected at the same time, and the OP wants to power them with the same single circuit.

The nameplate data is needed to figure out if the 30A OCPD is correctly sized, and if 30A is sufficient to power both units.

-Jon
 
winnie said:
Because both units will be connected at the same time, and the OP wants to power them with the same single circuit.

The nameplate data is needed to figure out if the 30A OCPD is correctly sized, and if 30A is sufficient to power both units.

-Jon
Click to expand...
I read your post #12. (y)
 
Status
Not open for further replies.
Top