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TomG - Sounds like you need a smart "conditioning" UPS on your furnace not just your PC. We use regular computer UPSs on our radios systems at work and as long as you buy appropriate capacity, it will supplement line voltage during brownouts and provide power until your autostart generator kicks in.
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Newt;
A flexible isolator between the furnace and the main plenum would reduce the noise tranfered through the duct work.
The main trunks on my system are insulated on the inside of the steel ducts. This also reduces the noise. The only noise I get is the rushing air when it comes on.
The main noise I get now is the water cirulating pump for the main lines. I have had other pump that are barely audible but the pump this system arrived with is too loud. On the furnace area is enclosed it should be less of a problem but I wonder if I should contact the manufacture or furnace supplier.
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Steve: Thanks for the comment. That’s the sort of thing I was thinking of. I don't know how the UPS system works, but I think in terms of resonant core transformers to dampen short-term voltage changes and automatic adjust auto-transformers for long term changes. The UPS thing may be a simpler and less expensive approach. My oil company owner would love it if I came up with a solution. He's about going nuts responding to trouble calls on new oil furnaces and can't find anything wrong.
Too bad my backup generator isn't auto start. I really don't think that running electric motors on 85V (which happens around here) does them any good. A very good auto-transformer would fix the problem even though one probably would pop a circuit breaker if it actually had to adjust voltage that much.
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I'm not sure exactly how the conditioning units work. Could be that the inverter runs all the time and only draws from the battery when needed. I see to remember that +/- 10% voltage was acceptable for ac motors. So 85 is a touch low! And the starting amperage may be a bit high unless the ups is rated for it. I'm told that they have a serial port for data logging software so you could monitor the power over time.
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Well you had me confused for a moment there, I had to read back aways to pick up the thread.
The UPS units use the valve regulated lead acid batteries, which we have discussed before in terms of tractor starter batteries. There would be no problem with the start load on the battery obviously a DC truck or tractor start motor is going to draw more amp than an AC fan motor. I am however uncertain as to the switching circiut on the UPS. Certainly if the unit will run the fan or furnace continously for a time it should be able to accept the start amps from the motor.
I believe the units for this application are different than one for the computer.
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If it's a battery/inverter approach, the starting current probably is limited by the inverter circuit components rather than the battery. The unit also would have to isolate itself from the utility AC, or the higher voltage would back feed the utility.
I maintained an old omni-range while in the Air force. The equipment was fed through an auto-transformer, because utility voltage isn't reliable enough. A sensing circuit adjusted the auto-transformer tap up or down to achieve a desired output voltage. I'm not sure what the total AC load for the site was, but the transformer itself wasn't very large.
The advantage of auto-transformers is that they have high current capacity. Their disadvantages are that they can't compensate for short term voltage changes, and that increasing the output voltage increases the input current draw.
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04-08-2002, 15:33 
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