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Old 06-19-2009, 04:59 PM   #16
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Trane XE1000 compressor question


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Originally Posted by Yoyizit View Post
That was covered under the "other things being equal." Designing for reliability gets pretty tricky; that's why there is MIL-STD-217.

"A 14 SEER isn't anymore complex then his old XE1000."
Then how do they get the higher efficiency?

More parts connected so you get redundancy may be more reliable; more parts wired in sequence is less reliable, other things being equal.
You miss my point Yoyzy. Iam saying that the higher seer ratings models(and I assumed everyone knew that meant high end equip (well that statement is redundant. Everybody selling hvac already know 14 SEER and higher have all the protective devices I am refering to)).

In the infantcy of hvac all condensers came with fan cycling, low press control, high press control, crankcase heater, suction accumulator, discharge muffler, and external overcurrent and over heat protection.

They protected the equip against all the problems that could kill a compressor.

Costs caused these protective devices to be replaced by a heat only sensing thermostat buried in comp windings.

We see these devices make a return in the higher end equip.
They make the equipment more reliable. I won't argue why, if you know hvac it's self evident.

The bottom line is protect the compressor from all the hazards that kill a cmpressor and you have a longer lasting unit. That spells reliability to me.

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Old 06-19-2009, 05:09 PM   #17
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Trane XE1000 compressor question


Quote:
Originally Posted by Yoyizit View Post
"A 14 SEER isn't anymore complex then his old XE1000."
Then how do they get the higher efficiency?

More parts connected so you get redundancy may be more reliable; more parts wired in sequence is less reliable, other things being equal.
Larger indoor and outdoor coils.
Rated the the condenser at a lower condensing temp. Where it draws lower amperage.
Lower HP condenser fan motors.
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Old 06-19-2009, 08:55 PM   #18
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Trane XE1000 compressor question


Thanks for your answers. I've got more study to do, for sure.

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