What type (gauge) of wiring for Hayward Heatpro capacitor/compressor wire?

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RNC10

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May 16, 2020
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Connecticut
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Hi everyone,

I have a Hayward Heatpro HP21104T heater that recently stopped heating. The fan turns on but the compressor doesn't kick in. I removed the panel to test the usual components (contactor, capacitor, low voltage signal) and noticed that the wiring from the contactor to the capacitor and the wiring from the capacitor to the compressor are both fried (see red stranded wiring in the photo). My plan is to replace the capacitor and the wiring. Does anyone know what gauge the wiring is that is used in this application? I can't make out the text on the insulation of the wire from the photo and have since closed the heater back up. Thanks for any help!
 

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How old is your heater? Why is there so much corrosion in the photo. Is there more corrosion in the heater that is not shown? It is possible that you may have more problems than just the capacitor and wiring. If capacitor is bad you may also have a problem with the contactor contacts. I would also ohm out the compressor windings. Has the heater been running all season until the problem occured?
 
keep reading the other red wire. it should say further down which we cant see from your photo.
If you cant find it then clip off an inch and take to the hardware store to match when you pick up your new capacitor.

The blue wire has melted insulation as well. maybe tape it a bit.
 
The "THHN" part of THHN wire stands for "Thermoplastic High Heat-Resistant, Nylon-Coated".

"THWN" wire has the same properties, but the "W" part of THWN adds "Water resistance".

The main difference between THHN and THWN wires are their maximum recommended operating temperatures in wet locations.

While THHN wire is rated to be used in wet locations with ambient temperatures up to 75°C, THWN wire has a higher maximum recommended operating temperature of 90°C in both wet and dry environments.
 
10 AWG STR wire for residential, commercial and industrial use.

XHHW electrical wire can be used in wet or dry locations.

www.homedepot.com

Cerrowire 500 ft. 10 Gauge Black Stranded CU XHHW-2 Wire 1171-2801J - The Home Depot

Cerro's building wire is created primarily for use in conduit or other recognized raceways for service, feeder and branch circuit applications. This wire may be installed in both exposed and concealed
www.homedepot.com

wirewireelectricsupply.com

10 THHN, THWN-2 Stranded Copper Wire for Use in Conduit

Per 25 ft | 14 GA AWG | 19 Strand Conductor | THHN, THWN-2 | 600V | 90°C | Copper | UL Listed | Buy American Compliant
wirewireelectricsupply.com wirewireelectricsupply.com
 

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swamprat69 said:
How old is your heater? Why is there so much corrosion in the photo. Is there more corrosion in the heater that is not shown? It is possible that you may have more problems than just the capacitor and wiring. If capacitor is bad you may also have a problem with the contactor contacts. I would also ohm out the compressor windings. Has the heater been running all season until the problem occured?
Click to expand...
Sorry. I had notifications off for the thread and forgot to check the thread after a few days. The heater has been up and down throughout the season due to different issues. I have had sporadic issues with mice in the heater for the ten years since it was installed. I have been fixing it as I go, but this issue recently came up. I was able to find the correct wiring and it worked for a few weeks and it went again today when I turned on the heater. The red wire that I replaced from the compressor contactor to the capacitor, as well as the white wire from L2 on the compressor contactor to L2 on the fan contactor seemed to have gone. I think replacing the compressor contactor is probably a good point.
 
JamesW said:
www.homedepot.com

Southwire By-the-Foot 10 Black Stranded CU THHN Wire 22973299 - The Home Depot

Southwire's THHN and THWN-2 is a multi-purpose building wire used in conduit and cable trays for service, feeders and branch circuits in commercial and industrial applications. It is also used as a conductor
www.homedepot.com
Click to expand...
I apologize. I had notifications turned off and forgot to check the thread a few days after I fixed the issue. Thank you so much for your helpful replies. This was the wiring that I ended up finding and using.
 
RNC10 said:
I was able to find the correct wiring and it worked for a few weeks and it went again today when I turned on the heater.
Click to expand...
What does "went again" mean?
RNC10 said:
The red wire that I replaced from the compressor contactor to the capacitor, as well as the white wire from L2 on the compressor contactor to L2 on the fan contactor seemed to have gone.
Click to expand...
What do you mean "seem to have gone"?
RNC10 said:
I think replacing the compressor contactor is probably a good point.
Click to expand...
If you are burning up wires, then you probably have a significant problem causing excessive amperage.

See what the amperage is.
 
JamesW said:
What does "went again" mean?

What do you mean "seem to have gone"?

If you are burning up wires, then you probably have a significant problem causing excessive amperage.

See what the amperage is.
Click to expand...
Thank you, I'll take a look at the amperage. The wire going from T1 on the compressor contractor to the compressor capacitor was fried. After about a month of usage with no issues, I turned on the heat pump the other day and heard and saw sparkling from behind the panel. I opened it up to see the wire was burnt up. The white wire, if I recall correctly, that jumps from the L2 on the compressor contractor to the L2 on the fan contractor looked a bit burnt up, also.
 
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