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Generators & Motors General Discussion Antique Generators, Light Plants and Old Electric Motors: Questions and answers about restoring and showing old power generation systems.

Generators & Motors General Discussion

Homelite LR5500 Generator


Hello Folks ... 1st time user here. Having a problem and hoping someone out there can help me....

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  #1  
Old 11-18-2008, 04:27 PM
rpmseattle rpmseattle is offline
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Default Homelite LR5500 Generator

Hello Folks ... 1st time user here. Having a problem and hoping someone out there can help me.

Trying to feed an American Standard-Comfort 80 gas furnace using a Homelite LR5500 generator.The furnace runs fine when on house power but shuts down when switch to generator. One other factor. House power is 120-volt, Gen power is 130-volt.

Does anyone have any ideas? Contacted an HVAC company and they thought that the higher voltage might be the cause. If this is true is there a way to adjust the voltage output of this generator.

Any help will be appreciated.

Rich
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Old 11-18-2008, 06:06 PM
Don Smith Don Smith is offline
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Default Re: Homelite LR5500 Generator

Voltage control is dependent on engine speed. Slow down the engine using the carburator linkage adjustment. Many of the Homelite generators will not handle the start current necessary to start and run electric motors. If you were to measure the generator voltage while trying to start the furnace motor it would tell a lot about the problem. Many generators of that breed will have the voltage output collapse when placed under the start load of a motor. Don
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Old 11-18-2008, 06:27 PM
Ed Radtke Ed Radtke is offline
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Default Re: Homelite LR5500 Generator

also be certain your frequency is right.
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Old 11-18-2008, 06:47 PM
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Mikey4026 Mikey4026 is offline
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Default Re: Homelite LR5500 Generator

I have heard of issues running some furnaces with variable speed fan systems. It appears that the power is not clean enough for the electronics in the speed controller (too much electronic noise and voltage spikes). It may effect some without the variable speed control also.

Mikey
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Old 11-19-2008, 08:41 AM
armandh armandh is offline
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Default Re: Homelite LR5500 Generator

a lot of the electronic ignition units are subject to bonding problems. reverse the AC leads and they work.

furnace blowers that are brushless DC or other exotic controls may be very picky.

even a standard motor may need a fresh run cap to go on a generator.
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Old 11-19-2008, 03:16 PM
rpmseattle rpmseattle is offline
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Default Re: Homelite LR5500 Generator

Thank you all for the information.

I now have someplace to start checking.

Thanks again.

Rich
rpmseattle
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Old 12-01-2008, 04:31 PM
rpmseattle rpmseattle is offline
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Default Re: Homelite LR5500 Generator

Just an update to what I found out concerning the running of a gas furnace using the homelite L%55500 generator. This is also a problem with other generators.

We contacted the manufacture of the furnace. He sent us a fax that showed the installation of a 30mfd@370-volt Run Capacitor across the load side of the furnace. They show the connection just down stream from the door switch. Connect it between the hot and neutral wires.

These instructions were followed and the unit works perfectly.
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Old 12-01-2008, 08:38 PM
armandh armandh is offline
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Default Re: Homelite LR5500 Generator

I did not know the ignition system could be power factor sensitive. however it does not supprise me.
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Old 12-01-2008, 08:40 PM
Wayne 440 Wayne 440 is offline
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Default Re: Homelite LR5500 Generator

The capacitor would be an effective filter for high frequency noise and "hash" also.
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