01-21-14, 08:21 PM | #1 |
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12,000btu fuji
Right then....12000btu Fujitsu ductless in my shop. Popped in while the temps were -18C outside and checked the current on the unit....6.5A on each leg.
Anyone got a 1 ton to compare against? Might not be a fair comparison as I lost a bit of oil and doubtless a bit of gas as well over the recent cold spell. |
01-22-14, 08:34 AM | #2 | |
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I installed a 13 SEER 12,000 mini split A/C - Heat Pump , this summer . It is 120 VAC . Pulls about 10 amps , this last summer . Have not checked the amperage this winter ? Does your Fujitsu heet well at -18C ? My HP starts to strain and take a long time to cycle off beginning around 25F . God bless Wyr |
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01-22-14, 08:46 AM | #3 |
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The Fuji is a 24 seer unit, IIRC 10.2 HSPF. 240Vac
It is not straining to heat but it doesn't seem to be shutting off so i couldn't tell you if it is near its limit. I don't have a basic air thermometer in the shop but I should get one. |
01-22-14, 09:51 AM | #4 | |
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The outside unit has sophisticated electronics to monitor the temps and pressures and the ability to modulate the power . The compressor is made to run at variable speed , paired up with the electronics . The net results is , in stead of cycling the system off and on , the compressor changes speed with changing load . So , your system may be slowing down , in stead of cycling ? If your system is pulling 6.5 amps of 240 VAC , that comes down to a little greater wattage than my unit with 10 amps at 120 VAC , for cool ? Not what I would guess for your high SEER unit ? God bless Wyr |
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01-22-14, 09:56 AM | #5 |
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Unfortunately it isn't a good comparison because the conditions are totally different. Maybe Xringer could chime in too or anyone else as well.
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01-22-14, 10:07 AM | #6 | |
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Using his data 6.5 amps x 240 VAC = 1560 watts . My data 10 amps x 120 VAC = 1200 watts . Admittedly , my data was summer time cooling , his winter heating . But amps is amps , volts is volts and watts is watts . I noticed he was quoting temperature in Centigrade / Celsius . I quoted temperature in Fahrenheit . So , he may be on the other side of the pond ? Or may be our northern neighbor ? But no matter where we happen to be located on the globe , Newtonian physics seems to work pretty much the same . God bless Wyr |
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01-22-14, 01:30 PM | #7 |
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Fujitsu rival
Mikesolar
A homemade GSHP running on BBQ propane 2.5 T, and your familiar with it. 7.3 Amp @ 230 Volt 1 ph. Just for comparison. The O/S air temp -24 Deg C. Shop temp dips to 12 Deg. C Recovers to 16 Deg. by lunch time. Could use a little larger unit!!! Randen Last edited by Daox; 01-22-14 at 01:33 PM.. |
01-23-14, 06:50 AM | #8 |
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The issue is the the spread between indoor condensing temp (pressure) the evap temp (which in my case is -20C). Randen has a GSHP so the temp difference will naturally be narrower at -20C outdoor and current will be lower for the same pot.
Even the AHRI couldn't figure out how to measure efficiency with inverter systems, for the longest time. I guess that means that my value of 6.5A/leg is kind of irrelevant as it is just a snapshot in time. |
01-23-14, 08:00 AM | #9 | |
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You are correct , an an inverter system , the 6.5 amps may be though of as a snap shot of what it is doing as that specific time . Did you measure the amperage going in ? The amperage going to the compressor would be difficult to calculate into watts . And it would not include the energy consumption of the fans . Best of luck . :-) God bless Wyr |
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01-25-14, 04:31 PM | #10 |
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How did you lose oil and gas?
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