AC with heat pump circ sizing?

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It will be getting inspected. Guess he could make a stink if a non fused went in right ?


I'll toss a coin when I get to the supply house.

Thank you.
 
One more question please.

Will the inside section need a service switch by it (I'm thinking so) ?

It's going in his living room , can I use a lock out on the breaker or lock the outdoor disconnect ?

Thinking not but hoping so.

Thank you
 
So I'm tossing a coin on that too ???

:- )



Im actually sitting in a church basement right now with a split and don't see a switch anywhere ??
 
ok. thank you.

I actually used one in my basement studio area. ( that I recently had to sell with the house cause she decided to divorce after 32yrs :happysad: .......... but thats another story ) It was a 3 pole "gray" Square D.

Thank you all.
 
Thank you

Looking at the unit online specs
It looks like the inside unit is 64w .3 amps
And I see a fuse in that inside unit

Think I can knock down the jumper between the condenser and evaporator to 14nm or will it need to be sized at the circuit size of 12 nm ?

Thank you
 
AFSIK, the outdoor disconnect turns off the indoor unit as well, if it is lockable then why is an indoor switch required?

It does not hurt to put one in fact it may be a good idea to have an indoor switch, but...
 
This question of having to have a disconnect on the indoor unit comes up all the time. It's not easy to do because it would have to be 3 pole and that kind of switch and enclosure doesn't lend itself to residential installations. Why doesn't UL require that the manufacturers provide a disconnect in the indoor unit itself like right under the hinged cover? Why do we always have to jump through hoops to comply with the Code?

-Hal
 
ritelec said:
I'm wiring a split system - inverter driven heat pump

https://www.ecomfort.com/manuals/fujitsu-ef5e950806692d0278afaa2f89b75ab0.pdf

MCA 17 fuse size max is 20

Would that be 10's (nm) on a 30 fused at 20 ??

Thank you
Click to expand...
That MCA already has 125% of largest load factored into it, unlike supplying a motor rated 17 amps - there you would still need to multiply by 1.25 to come up with minimum required conductor ampacity. 17 is less then 20 - so a 20 amp conductor is acceptable. NM being limited to 60C, you must use 12 AWG, but anything else that is rated at least 75C could be 14 AWG.

tom baker said:
The indoor unit has a motor so a disconnect is required, in WA we have an exception for a dwelling unit.
Click to expand...
Motor driven appliances rated less then 1/8 hp or 300 VA don't require a disconnecting means at the appliance.

Art 440 applications do require a disconnecting means within sight regardless of the rating, but the indoor air handler in such systems doesn't have a hermetic refrigerant compressor and therefore doesn't fall under art 440.
 
kwired said:
That MCA already has 125% of largest load factored into it, unlike supplying a motor rated 17 amps - there you would still need to multiply by 1.25 to come up with minimum required conductor ampacity. 17 is less then 20 - so a 20 amp conductor is acceptable. NM being limited to 60C, you must use 12 AWG, but anything else that is rated at least 75C could be 14 AWG.

Motor driven appliances rated less then 1/8 hp or 300 VA don't require a disconnecting means at the appliance.

Art 440 applications do require a disconnecting means within sight regardless of the rating, but the indoor air handler in such systems doesn't have a hermetic refrigerant compressor and therefore doesn't fall under art 440.
Click to expand...

So at 64 VA and no compressor or you saying the air handler doesn't need a disconnect? Thank you
 
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