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Xringer · 12-01-10, 05:55 PM

I missed something..

"but since the compressor provides cooling commensurately faster,"

Firstly, we are heating, not cooling.
But more importantly, there is a major flaw in the old thermostat-feedback-loop.
(I assume this loop is what you were referring to).

In order to extend the lives of two AA cells in the remote (which houses the thermistor),
the IR data burst containing the current room temperature is only transmitted to the
indoor unit once every 5 minutes!!
So, the feedback would arrive about 4 minutes AFTER the over-load/over-pressure event took place..

The indoor unit has a built in thermistor, but selecting it does not really help with High-voltage runaway..
The death spiral moves at a rapid pace, only human intervention can stop it.
The machine's too slow and makes too little use of it's sensors.. IMHO anyways..

Cheers,
Rich

12-01-10, 05:55 PM	#21
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	I missed something.. "but since the compressor provides cooling commensurately faster," Firstly, we are heating, not cooling. But more importantly, there is a major flaw in the old thermostat-feedback-loop. (I assume this loop is what you were referring to). In order to extend the lives of two AA cells in the remote (which houses the thermistor), the IR data burst containing the current room temperature is only transmitted to the indoor unit once every 5 minutes!! So, the feedback would arrive about 4 minutes AFTER the over-load/over-pressure event took place.. The indoor unit has a built in thermistor, but selecting it does not really help with High-voltage runaway.. The death spiral moves at a rapid pace, only human intervention can stop it. The machine's too slow and makes too little use of it's sensors.. IMHO anyways.. Cheers, Rich