HVAC disconnect question

[rbstern]

I'm wiring and finishing a shed. I'm going to install a mini split HVAC unit. The HVAC compressor unit will be about 7', direct line of sight, from the exterior mounted meter/breaker box, with an accessible breaker for the HVAC unit.

Given that, do I still need a disconnect box for the HVAC power feed, or does the breaker satisfy the NEC requirement for a disconnect?

 

[2manyrocks]

I think code requires a disconnect near the outside condensing unit. Even if not required by code, I'd still install a disconnect along with a surge protector to protect the circuit boards from surges. https://www.amazon.com/Mars-83905-S...x=hvac+surge+protective+device,aps,100&sr=8-1

 

[grsthegreat]

If its insite, its not required, however you will need to add a breaker lock out device for the units breaker.

thats being said, most hvac manufacturers require a fuse, not a beaker, to protect their device. Thats why i always install a fusible disconnect and use slo blo fuses. Also requires a 120 v GFCI outlet located within 25’ for service of hvac unit.

 

[tractortroof]

Make sure you read the directions on the mini to see if they have a minimum length of line set

 

[MAX-24-Dean]

@grsthegreat nailed it, just install like he posted and you won't have any problems passing an inspection.

 

[Midniteoyl]

If its insite, its not required

I thought the same, but both HVAC guys that came out for quotes said they had to move the disconnect to within 5'. I ended up doing things myself and left the disconnect where it was, 8' away.

 

[grsthegreat]

NEC dies not require it, but device manufacturer probably does. Fuses are better motor protection than breakers.

 

[MAX-24-Dean]

I thought the same, but both HVAC guys that came out for quotes said they had to move the disconnect to within 5'. I ended up doing things myself and left the disconnect where it was, 8' away.

A lot of inspectors will let the 3' to 5' of flex conduits go unsupported, when you get flexible conduit much longer the conduit supports get a closer look by a lot of inspectors.
The code says to install a disconnect within sight of the unit, that is defined as within 50'. Been round and round on that one with inspectors and HVAC Techs.
Best practice is to get the disconnect as close to the HVAC unit as possible.
I installed a unit that the manufacturers written instructions said the disconnect must be within 2' of the outside egde of the unit. Always install according to the manufacturers written instructions as that is part of code also.

 

[MAX-24-Dean]

NEC dies not require it, but device manufacturer probably does. Fuses are better motor protection than breakers.

Really a technicality here, but if the device manufacturer requires it, then it is code to install it according to the manufacturers written instructions.
I had plenty of corrections from inspectors having me rework items because they were aware of what the manufacturer required in the instructions for installation.

And fuses are the only way I will install any motor load. Protects the motor and the customer from pocketbook problems.

 

[kenmac]

Currently using a HACR breaker for my VRF unit.
Many just use a 60 A disconnect at the condensing unit
Haven't seen anyone use slow blow fuses at the unit in a long time