Was on with tech support today and he had me cut the JPR-2/term jumper on the board to initiate a longer defrost. Anyone have specific numbers and criteria for doing this?
JPR-2 jumper....Trane
Adlerberts-Protege
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Was on with tech support today and he had me cut the JPR-2/term jumper on the board to initiate a longer defrost. Anyone have specific numbers and criteria for doing this?
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What did 'he' say when you asked him?
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He didn’t say actual numbers. He just said it will run defrost longer to be more thorough and get all of the frost off before it terminates. He also said that Trane is very secretive about there defrost algorithms so he didn’t know the exact ambient/indoor sensor and delta T thresholds to initiate and terminate defrost.
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Sounds like he didn't know either. Gotta be someone on here who knows the secret sauce.
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It’s a learning board. But the algorithms are a secret. Demand defrost.
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I know what the jumper does. Changes it from 47 to 70 degrees. I just want some answers on what is more efficient.
If the coil is completely thawed/frost free, than a short defrost time is more efficient. If its not completely frost free in a short time, than a longer defrost time is more efficient. As you get more heat from a completely frost free coil, than one that still has frost/ice on it.
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I get all that but what I want to know is if it is climate dependent or what there reasoning is for having this jumper than can be cut. I would imagine in my climate(a colder one) it makes more sense to cut the jumper. I just would like some hard data or something on paper stating this. All the higher ups in the Trane world are very secretive about these things.
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I figured that too but the reps I talked to (3), all know Central Oregon well (dry and cold), and all told me to cut the jumper. Hmmm.
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Yes. Pretty consistently windy year round.
High winds can require a higher termination temp.
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Ya. That makes sense. And his unit does sit between his house and an out-building that will funnel the prevailing winds and speed them up. That’s what I love about this trade, all the little details to look out for.
And, been, I assume you are referencing wind chill.
Basically. Or you can think of it as forced convection.
In a normal defrost with little to no wind. The coil warms up fairly evenly, and fairly fast. With the wind blowing, it takes longer to warm up, and doesn't warm up evenly, so not all of the coil thaws.
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