| [GMCnet] COACH FURNACE RECREATION? CAN A LESS POWER HUNGRY FAN BE USED? [message #340859] |
Sun, 10 February 2019 14:26  |
JerryW
Messages: 256
Registered: August 2018
Karma:
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Senior Member |
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I have not researched this issue myself but since the fan powers the burner as well as pushing air across the heat exchanger I would guess the manufacturer has fitted the lowest power draw blower they think would meet both demands in the wide variety of applications where these furnaces are used.
If too little air is supplied to the burner then the furnace will not fire or will burn too rich. If too little air passes over the heat exchanger then the high temp limit switch will open and the furnace will not run.
Meter yours while in use and you will likely find it draws 7 to 9 amps while running. If that is the only power draw then it would take a fully charged 140 to 180 amp hour battery bank to power it for 10 hours.
Best way to keep the air flow where it belongs with the stock fan is to keep the squirrel cage clean and shaft lubed and to use a shorter run of larger wire to supply 12vdc to the furnace and a larger, shorter run to provide good ground. Depending on the upfitter and year the stock wiring may have been marginal from the get go.
Jerry Work
Kerby, OR
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