Question about Electric Circuit Breaker Kit for Furnace

# Need to know what gauge wire to use for a 20 kw electric furnace model number ASPF462016EA

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### ORAY SAVOIE

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#8 copper only do not even think about aluminum, because of the chance of aluminum causing a fire.

Posted on Oct 07, 2019

### Brandon

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Assuming this is residential and your voltage is 240. #8 copper or #6 aluminum on a 40amp 2-pole breaker , I'd suggest the copper. Aluminum is cheaper but you get what you pay for. If you decide on the aluminum make sure you use a de-oxidizer such as "nolox" or your connections will burn up which could be a fire hazard.

Posted on Dec 17, 2011

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Posted on Jan 02, 2017

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## Related Questions:

### Just purchased this heater, the fan comes on but the heat is next to nothing. I checked the voltage at the elements and is is 235v the amperage on L1 and L2 is 20.8a. If I pull the fan wire off the relay,...

First off, 20.8 amps is approximately the amperage draw on a single element furnace (nominally 5 kw.) So if you have 3 or 4 elements, (15 or 20 kw capacity) the problem is the remaining elements are not being enrgized. Look to see if there is a W1 and W2 and even possibly a W3 terminal on the terminal strip. If so, and its not a heat pump, there should be thermostat wires on all three, indicating three stages of heat. To energize those properly, the thermostat should be a multi-stage heating thermostat providing W1 and W2 at the minimum. If you do not have a multi stage thermostat, and there are no wires on W2 and W3, jumper W1, W2 and W3 together and the furnace will come on at full capacity with the single stage thermostat.

If you DO in fact have wires on the additional W terminals, you more than likely have a heat sequencer that is not energizing the 2nd and possibly the third stage of heat. A three element furnace is typically called a 15kw furnace and the three elements should draw approximately 19 to 20 amps each. So when each stage draws in, the clamp on amprobe on the main incoming wires will correspondingly increase with each stage.

Also, some 15 and 20 kw furnaces require two circuits to supply the elements, and I have been on calls before where the second breaker was not turned on, and in one case, the second circuit wasn't even wired in from the electrical panel box.

DO NOT pull the wire off the fan while the heaters are energized as they will rapidly cycle on an overtemp device. Some actually have a "one time" thermal link that once melted render the respective element inoperable until that thermal link is replaced. They will melt very easily. An energized element MUST have airflow across it !!!

Dec 13, 2014 | Ouellet 5000-Watt Utility/Garage Space...

### Goodman furnace a36-20 fan runs non stop

is green wire from thermostat or from outdoor. retrace and change as needed. If not Goodman has a tech support number you can call while looking at unit.

Jun 21, 2014 | Goodman Heating & Cooling

### Just purchased a Filtrete 3M-50 Wifi Programmable Thermostat. I have a Carrier Crusader furnace. I need to connect the Blue wire in the furnace to a terminal so I get power to Wifi module in thermostat....

You'll need the manual for this and electrical knowledge. The Blue wire is the common wire that is needed to supply the 28 volts to the thermostat. The problem and potentially life threatening hazard, is the 28v is off a 120 or 240v transformer and, without proper understanding of electrical diagrams as well as ensuring all power is off the the unit, you can connect to the wrong terminal and burn your house down or electrocute yourself.

I Highly recommend hiring a professional to install that wire. If you insist, I will need the exact model number of the furnace to get the proper manual to help further.

Dec 15, 2017 | Heating & Cooling

### I have a new furnace and the breaker keeps tripping (20/30). It is a bryant westinghouse box. I think 200 amphes

1) You got a FIRE truck coming.

2) Wire is too small.
Problem is NOT circuit breaker.

3) Both 240Volt appliances on same breaker is a hazard, especially if space available in 200 amp service panel for more breakers.

4) Usually each 240V appliance has separate breaker.

5) Circuit breaker trips because of High heat on the wire.
If wire gets hot, it will start a fire inside the wall.

Electric code requires wire-size match breaker-size.

6) If you put larger amp breaker on same wire that is getting hot, then wire will get hotter.
Result: FIRE truck middle of night with folks jumping out window in glass-cut bare run across yard.

7) Each appliance has volts and watt rating on label.
EVERY appliance has label.

8) For example stove might be rated 8000 watts and 240Volt.
8000 watts divided by 240 volts = 33.3 amps
Stove would require 40 amp breaker and 8 gauge wire.

9) How to figure it out:
http://waterheatertimer.org/Color-codewire.html
http://waterheatertimer.org/How-to-install-a-subpanel.html

10) Do same calculation for new furnace.
12000 watt furnace divided by 240 volts = 50 amps.
Use 60 amp breaker and 6 gauge wire.

11) Summary: fixya wants you to be safe, and buy stuff showing in the ads.
Use a bigger breaker ONLY when bigger wire is also installed.
Call furnace installer, the installer should know to check safe wiring before installing.

If you need further help, Iām available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Nov 04, 2012 | Bryant Westinghouse Bqc Quad Circuit...

### Can I change out a Hayward H400ID with an electric heater for the spa only? If so what electric heater product brand would you recommned. Raypak?

Hayward has manuals for each type heater, gas and electric.
http://www.hayward-pool.com/prd/In-Ground-Pool-Manuals_10201_10551_14502_-1___I.htm
Hayward also has contact page, and can probably recommend correct change-over product.

You want to switch from propane to heat-pump type.

There are likely 3 areas of difference. Read each manual and generally look for 1) unit size and capability to match spa 2) pipe connections and sizes 3) Electrical requirement

From electrical standpoint, You need GFCI-protected line from circuit breaker box, or GFCI (arc-fault) breaker. This will prevent electrocution risk around spa.
http://waterheatertimer.org/How-to-wire-GFCI.html

Wire sizes are based on volts and watt-rating of heater.
Each electrical device has rating plate showing volts and watts.
3500 watts divided by 240 volts = 14.5 amps so install double-pole 20 amp breaker and use 12 gauge wire.
1500 watts divided by 120 volts = 12.5 amps so install sinle-pole 20 amp breaker and 12 gauge wire.
http://waterheatertimer.org/Color-codewire.html

If you need further help, Iām available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Oct 28, 2012 | Raypak Spapak Electric Spa Heater -...

### My electric furnace keeps tripping the breaker , it will run for about five or ten minutes then trips.

If you dont have an ampmeter it is hard to tell whats going on. First check the breaker and see if it is getting hot. If so turn off power get a screwdriver and check to see if wire are tight on the breaker. Loose wires cause breakers to trip. If the unit has ran before and it has not tripped the breaker and it hss just now atarted replace breaker but do not put a larger one in. Check the size of your heat strip in Kw or what they call for on the size of the breaker. 10 kw no larger that 60 5kw no larger than 30. 15 kw has a 60 amp and a 30 amo circuit. Let me know whats going on.Rus

Dec 07, 2009 | Refrigerators

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