Subpanel for HVAC

[cheezhd]

Hi,

I am installing two heat pump condensers side by side and rather than run two disconnect switches, each with its own surge protector, I am hoping to connect them to a single subpanel with a single surge protector. The main panel is flush mounted indoors on the wall immediately behind where the heat pumps will go.

My plan is to put a 100 or 125 amp subpanel directly behind and beneath the main panel and then fish a wire through the wall and up into the panel, so I should be able to avoid opening up the drywall. I'm planning to use #4 AWG copper (4-wire) and run the panel off a 60 amp breaker. The mismatch between the panel and breaker size is because I want the space of a large panel but I don't anticipate the panel ever supplying a greater load than 60 amp. The neutral and ground for the panel will not be bonded. The heat pumps each get a 15 amp 240 v breaker, and the surge protector also gets a double pole breaker.

Does anyone see any issues (code or otherwise) with this plan? Many thanks in advance for any guidance.

 

[wyliesdiesels]

Can you post a picture of the nameplate on each heat pump?

 

[cheezhd]

I don't have access to the nameplate yet, but these are the manufacturer specifications for each. Does this give you the information you're looking for?

 

[kaffine]

If you don't have a 120V outlet nearby I would also install one off the subpanel. Useful for running the vacuum pump when installing the HVAC system.

 

[Norcal]

If you don't have a 120V outlet nearby I would also install one off the subpanel. Useful for running the vacuum pump when installing the HVAC system.

A 120 volt receptacle is required nearby for servicing the equipment, not optional.

 

[kaffine]

A 120 volt receptacle is required nearby for servicing the equipment, not optional.

Thanks. I couldn't remember if it was NEC code required or a local requirement.

 

[yeldogt]

I have an outdoor sub on a post next to my 3 ac compressors ... three whips to the units. Feeds some LV light transformers from another breaker plus a couple GFI outlets. Conduit to the drive for an electric car.

 

[Terry D]

You could save a couple of bucks a run #6 copper. Its good for 60 amps.