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Old 03-20-2017, 06:36 PM   #21
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Would a UPS, after the genset, clean it up enough?
A true double conversion UPS MIGHT work, but if the sine wave or frequency is not decent the UPS might stay on battery until it is depleted.
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Old 03-20-2017, 08:30 PM   #22
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All I know on the one I changed the control board on, it held it closer to 60hz. The voltage regulator on those is a separate board. It solved that one. Don't know which component that fluctuates is the bigger problem. The frequency, off likely to begin with fluctuates, the voltage fluctuates...

I have tried the double conversion type Tripp Lite with an almost new but mechanically governed Briggs 10kw with a Triangle tube wall hanger boiler from 2008. The ups helped but never pushed the frequency totally back to 60hz. Fortunately the boiler started leaking and got replaced. This thing would crash when the utility would have brief outages. While this isn't an airhandler, has anyone tried it recently with success?
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Last edited by nrp3; 03-20-2017 at 08:35 PM.
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Old 03-25-2017, 06:59 PM   #23
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Below is what i was sent directly from Lennox...


Lennox recommends when connecting a portable generator or emergency backup generator to a Lennox furnace, the furnace and generator be connected per local electrical codes. In the absence of local codes the furnace and generator must be installed to the current National Electrical Code (NEC). Failure to use a power interlock switch can cause personal injury to anyone servicing the incoming power supply. These codes specifically require proper grounding of the furnace and generator.

The SureLight® integrated control must sense a proper ground before it will initiate sequence of operation. This means the Lennox furnace with a SureLight control will not operate without a proper ground. The ground sense function of the SureLight control is a safety feature and the furnace will not operate on permanent or temporary power without a proper ground. It is also important to remember, that any furnace using flame rectification for sensing flame signal, will have problems without a proper ground.

The unit voltage requirements when used with a generator are:

120 volts + or – 10% (108 volts to 132 volts)

60 Hz + or – 5% (57 Hz to 63 Hz)

It is recommended to use a generator with a low wave form distortion of 3% to 8%, which generally does not require a power filter. Also, a generator certified for computer use would not require a power filter. The generator manufacturer or supplier should be consulted for proper sizing of the generator.

When these recommendation and requirements are followed the normal product warranty applies.
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Old 03-25-2017, 07:38 PM   #24
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The SureLight® integrated control must sense a proper ground before it will initiate sequence of operation.


It is recommended to use a generator with a low wave form distortion of 3% to 8%

I read the first part and thought ... Wow ... so it's a ground issue ... cool, now I know

Then the last part .... Oh yeah, I'll dust off my distortion analyser and check out the waveform
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Old 03-25-2017, 08:13 PM   #25
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I don't know if I've seen a generator actually certified for "computer" use. Those voltage parameters seem to be reasonable.
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Old 03-25-2017, 08:46 PM   #26
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Based on all this information, do you think this Rigid generator would be fine or do I need to go to a full inverter type?

http://www.homedepot.com/p/RIDGID-7-...001P/205909662
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Old 03-25-2017, 08:58 PM   #27
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I've forgotten, did you test the output to see if it is within those parameters. While that Ridgid unit looks good, it is likely mechanically governed too and may not solve your problem.
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Old 03-25-2017, 09:05 PM   #28
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My volts and Hz are in the range but I have not tested the waves
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Old 03-25-2017, 09:06 PM   #29
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Interesting that they claim <6% THD on that unit
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Old Yesterday, 07:35 AM   #30
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All the Ridgid gens advertise the +\- 6%. It's either this or a honda inverter, but the only Honda inverter with a 240 is 4 times that cost.
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Old Yesterday, 03:41 PM   #31
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Based on all this information, do you think this Rigid generator would be fine or do I need to go to a full inverter type?

http://www.homedepot.com/p/RIDGID-7-...001P/205909662
No doubt that the inverter gen will work for you.
I'd have no problem buying the Champion inverter gen. Many of the 'off' models can be paralleled to, which doubles the output, and 'I think' gives you 240V ... hopefully someone can confirm that.
If not, still go with a generic inverter (non-honda), they come in 240V in the larger sizes.

Personally, I'd buy the Ridgid and try it out !
The good thing about Home Despot, is you can buy it, try it .. bring it back if it doesn't do the job.
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Old Yesterday, 03:56 PM   #32
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No doubt that the inverter gen will work for you.
I'd have no problem buying the Champion inverter gen. Many of the 'off' models can be paralleled to, which doubles the output, and 'I think' gives you 240V ... hopefully someone can confirm that.
If not, still go with a generic inverter (non-honda), they come in 240V in the larger sizes.

Personally, I'd buy the Ridgid and try it out !
The good thing about Home Despot, is you can buy it, try it .. bring it back if it doesn't do the job.
Bought a generac invertor 6-8 yrs ago. It didn't work properly right off the
bat. No way Rona would take it back. Checked with other stores (including
HD I think) and found this policy was universal for gas operated equipment.
Eventually sorted out the problem. Generac customer relations was
good but I still wouldn't recommend generac based on mine cuz it can
be impossible to start when cold....as in anything below 0degc.
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Old Yesterday, 04:16 PM   #33
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Bought a generac invertor 6-8 yrs ago. It didn't work properly right off the
bat. No way Rona would take it back. Checked with other stores (including
HD I think) and found this policy was universal for gas operated equipment.
Eventually sorted out the problem. Generac customer relations was
good but I still wouldn't recommend generac based on mine cuz it can
be impossible to start when cold....as in anything below 0degc.
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Good point about the return policy on the gen

As for the gen hard to start when below freezing, and I know some people won't agree with this ... when it's really cold, I spray a bit of 'quick start' right in the carb ... starts first or second pull everytime

I use an oil based flammable spray, so at least there is a bit of lubrication in it. My oldest gen (champion 3 Kw) is around 16 yrs old ... still running like a charm !
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Old Yesterday, 07:09 PM   #34
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No doubt that the inverter gen will work for you.
I'd have no problem buying the Champion inverter gen. Many of the 'off' models can be paralleled to, which doubles the output, and 'I think' gives you 240V ... hopefully someone can confirm that.
If not, still go with a generic inverter (non-honda), they come in 240V in the larger sizes.

Personally, I'd buy the Ridgid and try it out !
The good thing about Home Despot, is you can buy it, try it .. bring it back if it doesn't do the job.
I don't really know enough about it to say but I really like the idea of paralleling two portable generators. If one won't start, you still have the other, and if in some emergency you had to help someone out, you could do it without giving up all your power.
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Old Yesterday, 07:17 PM   #35
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I know you can do it with smaller honda inverters. I think IQ2000 can be too. Fairly good chance that going to an inverter type would do the job. I bet that Ridgid is a nice generator, but I still have concerns it won't run the furnace as any other mechanically governed type. I'd consider seeing if any of the rental places have a Honda to try out and maybe a different mechanically governed unit to try. I really believe the heating equipment people need to make their equipment of this type more tolerant of generators.
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Old Yesterday, 07:38 PM   #36
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I don't really know enough about it to say but I really like the idea of paralleling two portable generators. If one won't start, you still have the other, and if in some emergency you had to help someone out, you could do it without giving up all your power.
That's why a lot of people bought 2 EU2000i's instead of an EU3000i.

The cost was very similar but having 2 added redundancy, the ability to separate them, less weight to carry (1 at a time), and more overall power.
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Old Yesterday, 07:41 PM   #37
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I don't have one, so I can't comment on reliability ... But the champion inverter can be paralleled, and is <1/2 the price of the honda

http://www.championpowerequipment.co...-parallel-kit/
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Old Yesterday, 09:03 PM   #38
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Thanks for all the input. I like the idea of renting a few gens and seeing how it reacts
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Old Yesterday, 09:24 PM   #39
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Champion also has dual fuel (gas/LP) which is nice for small spaces maybe.
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