Original message
| millerized
 |  "Testing a defrost sensor"
, posted Fri 12 Dec 10:44  
OK, question for the guru's. History: Heil HHP030AKA1, frosts up to beat the band and never lets go of it. Replaced the defrost control board with an ICM304, which is a direct replacement for the stock ICP1069364. Re-installed as per original wiring, then checked book to make sure it was in correctly when first installed. Still frosts/ices to 1/2" - 1" and won't go into defrost. My last thing to check before I call the local guy is the defrost sensor. My question: Is there anyway to test the defrost sensor? Is it just a normal bi-metal pop disk that when it see's temp it snaps open/closed? I get to tackle this when I get home, but if there's anything else you guys could help with, please feel free. I'd be more than appreciative!
Thanks
Jim Miller
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Replies:
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| Xenos
Webmaster 
| "Re(1):Testing a defrost sensor" , posted Fri 12 Dec 17:02
I have no access to Heil support so I don’t know what system you have. However a sensor/ thermostat is used to start a defrost cycle. Yes it may be just a snap disk or it could be a thermister. If it’s a snap disk just jump it out and see if it defrosts during the next timing cycle.
Xenos.
The best way to escape a problem is to solve it.
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| | millerized
| "Re(2):Testing a defrost sensor" , posted Sat 13 Dec 10:45
I appreciate the help. I'll give it a shot. Worst I can do it break an already broken system. I'll take the gauges home tonight and see what they're doing. It heats just fine when it's clean, and cools like a big dog. I'll just do one step at a time.
Seems like no-one has Heil support. I can't even get it from the local guys. They want $80hr to check it out, and that's while it's still under warranty (2yrs left) as they're too busy. I called one guy in the spring, but he said he was too busy.
So, you buy a book, you ask for the help of friends and you do it your self. If it's reversing valve, I'll be polishing my skills on brazing/silvering again.
Thanks again.
Jim Miller
Jim Miller
Facility Manager
National Center for Cool and Cold Water Aquaculture
Leetown WV
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| | millerized
| "Re(3):Testing a defrost sensor" , posted Sat 13 Dec 14:13
OK. That was easy. Made a jumper, put it across the terminals (disconnected the sensor, and replaced it with the jumper) and she defrosted just fine. I've tried it 3 times, and I'm free of ice. Looks like I'll be replacing the sensor on Monday. Anyone need a like new defrost control cheap?
Thanks for the reply and the info. Don't take this wrong, but I hope I don't have to post again for a long time:-)
Jim
Jim Miller
Facility Manager
National Center for Cool and Cold Water Aquaculture
Leetown WV
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| | acman1973
| "Re(4):Testing a defrost sensor" , posted Thu 8 Jan 14:52
If you wish you can replace the demand defrost with a time temp defrost that works well and eliminates the demand sensor that your having trouble with.
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| | millerized
| "Re(5):Testing a defrost sensor" , posted Thu 8 Jan 15:19
Replaced it already, but thanks. Now to quiet an extremely noisy, vibrating compressor. Damn Heil crap. Just over 3 years old, never again.
millerized
Jim Miller
Facility Manager
National Center for Cool and Cold Water Aquaculture
Leetown WV
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