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Old 05-29-2007, 12:03 PM   #15
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2007 19' Bambi
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Thermostat Control Closeup

Just following up on our thermostat issue.

Here is a close up...



So if I understand this correctly, the arc slider at '1' allows you to adjust the switching differential, which would
be the temperature range before the unit cycles on/off. Seems to me this can also be controlled by adjusting the
screw at '2'.

Can someone clearify the usage of these two controls? I'm essentially trying to shorten the on/off cycle so we don't'
suffer through too cold/too hot cycles.

Too bad this darn thing is in the bathroom of all places!

Thanks
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Old 05-29-2007, 12:23 PM   #16
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Adjustment #2 is how you convert a precise device into an accurate one. It calibrates the temp arm to read correctly.

One thing to check when you have short cycle times is for obstruction of the ducting or intake or a slow fan. Any of these will casue the firebox to overheat and shut-off prematurely.
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Old 05-29-2007, 01:18 PM   #17
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I'm glad I asked this question. I don't seem to have adjustment #1 on my thermometer, so can I use #2 which I do have?
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Old 05-29-2007, 01:23 PM   #18
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I'm pretty sure you'll need a different thermostat.
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Old 05-29-2007, 03:45 PM   #19
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Quote:
Originally Posted by campadk
can someone clearify the usage of these two controls
Ignore 2. As stated above, I suspect it just enables the dial to show a more accurate number for the ambient temperature. Switch the 12v power off (batteries, 110v supply and tow vehicle umbilical). [I confess I don't bother to turn off the 12volt supplies.] With a finger, slide 1 across to the other end of the arc and see how the switching differential changes in practice when you start up the furnace after reconnecting the 12v. Then adjust it back a little at a time until it achieves your desired comfort level. I suspect 1. puts a variable resistance in the circuit.
This is a crude device. Changing to a digital thermostat is a huge improvement for very little outlay in time and money.
Nick
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