Indoor unit

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MAC702 said:
Not that I've ever seen. The only issues I've seen somewhat related to this have been when the installers used the backstab connections on the 15A switch, and the switch fails from overheating. I replace with another 15A switch, using the screws.
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Well changes to nec all those who actually use nec? Nec 430?

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I would look at it is an appliance and not a motor and use the manufacturers specs as central heating equipment is mentioned in 422.12.
 
packersparky said:
I would look at it is an appliance and not a motor and use the manufacturers specs as central heating equipment is mentioned in 422.12.
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Yea but heating is gas but has fan to draw air in and to distribute it in duct part of indoor outdoor unit. Outsoor is ac electric.. So your saying indoor gas heater is loke space heater deal and not fan motor/blower?

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codequestion said:
Yea but heating is gas but has fan to draw air in and to distribute it in duct part of indoor outdoor unit. Outsoor is ac electric.. So your saying indoor gas heater is loke space heater deal and not fan motor/blower?

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Is it listed as an appliance? If it is, meet the conditions in 422.31(A) through (C) for the disconnecting means.
 
packersparky said:
Then use 440.12 for rating the disconnect.
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The disconnect that I am talking about is not of air conditioning part comdensing unit.

I am talking about both sizong short circuit circuit breaker for the branch circuit and sizing disconnect of the furnance which is used as heating. So 440 would not apply refgeration equipment. I am szing heat gas furnance disconnect and branch circuit breaker.

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codequestion said:
The disconnect that I am talking about is not of air conditioning part comdensing unit.

I am talking about both sizong short circuit circuit breaker for the branch circuit and sizing disconnect of the furnance which is used as heating. So 440 would not apply refgeration equipment. I am szing heat gas furnance disconnect and branch circuit breaker.

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It looks more like appliance gas furnace but its also hvac.

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codequestion said:
It looks more like appliance gas furnace but its also hvac.
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Perhaps it is significant that this component of a split-system is often not referred to as an AC, but as an "air handler" or FCU (fan-coil unit). When not used in conjunction with a heat pump, it will often contain a gas furnace, which incidentally also adds another small motor for inducing the heat exchanger draft.

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MAC702 said:
Perhaps it is significant that this component of a split-system is often not referred to as an AC, but as an "air handler" or FCU (fan-coil unit). When not used in conjunction with a heat pump, it will often contain a gas furnace, which incidentally also adds another small motor for inducing the heat exchanger draft.

Presented for info only.
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It is split system so which nec article wpuld be usrd to suze the gas furnance heat disconnect and also overcurrent protection?

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codequestion said:
It is split system so which nec article wpuld be usrd to suze the gas furnance heat disconnect and also overcurrent protection?
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Again, I've no need to find out. I'm not saying that to be rude, just admitting that I'm not an expert at that part of the Code because I already know that every 120V machine I've ever seen (up to 5-tons, with a 3/4 HP blower) is already on a dedicated 15A breaker, #14 wire, and either a NEMA 5-15 receptacle or 15A switch. I work on these machines for a living, and see different ones every day, residential and commercial.

But, again, I'm not an engineer. I'm sure there are a few here that can actually do the paperwork on it.

As an aside, and again, not to be rude, but please so down on your typing, and use your spellchecker. I'm having to slow down to read through all the misspellings and figure out what you are trying to say.
 
It is an appliance, you start looking for installation requirements in 422. You possibly can be referred to 430 from parts of 422.

Most of these do have a current rating on a nameplate.

15 amp breaker works even on a 3/4 hp motor because they are usually PSC motors, or more recent years ECM motor. Neither has too high of inrush current when starting. If they were capacitor start motors 15 amp breaker probably nuisance trips at times if it is a 3/4 HP motor.
 
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