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Thread: daikin F3 high discharge temp
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13-11-2013, 11:04 PM #1
daikin F3 high discharge temp
chaps we have a system which keeps going on f3. we know the charge is correct but found that the oil return line is always red hot. we suspect the oil separator is not working correctly and acting as a hot gas injection line instead causing the high discharge temp.
attached is the picture of the unit. Can some one confirm the operation of the separator as we have an old unit being taken out soon so were going to swap the O.S out
TIA
2013-11-12_13-44-58_475.jpg
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14-11-2013, 06:25 AM #2
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Re: daikin F3 high discharge temp
Is this refrigerant diagram applicable in your case?
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14-11-2013, 07:22 AM #3
Re: daikin F3 high discharge temp
It's the inverter compressorSnipImage.jpg
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14-11-2013, 07:49 AM #4
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Re: daikin F3 high discharge temp
Oil level in oil separator is probably controlled by float.
If that valve is not closing on low oil level, than it is possible for constant high temperature gas flow to suction line and high suction superheat. It looks you need to change oil separator. Try to hit it hard few times with rubber hammer. Maybe that helps to unblock oil valve. Or maybe blowing nitrogen from high to low (and vice-versa) charging port.
I don't know any other possibility.Last edited by nike123; 14-11-2013 at 09:06 AM.
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14-11-2013, 08:18 AM #5
Re: daikin F3 high discharge temp
What is evap.pressure and SH in suction line. And whats the temperature of discharge pipe, DSH and condensing pressure. How quick system fall by error in full load?
p.s. lol, the second time I looked at the photo.))) nike123 was right. Try to hit oil separator) or change if its not help.
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14-11-2013, 08:44 AM #6
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14-11-2013, 11:31 PM #7
Re: daikin F3 high discharge temp
also solonoid e,b on rb's schematic will dump discharge gas back into the suction accumulator
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15-11-2013, 06:19 AM #8
Re: daikin F3 high discharge temp
Temperature rise right above oil return on suction line.
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15-11-2013, 01:13 PM #9
Re: daikin F3 high discharge temp
discharge temp 80c +
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15-11-2013, 02:07 PM #10
Re: daikin F3 high discharge temp
whats model of outdoor unit?
80+C at full load? Whats the frequency of Inverter?
100C and higher very bad for PVE.
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15-11-2013, 09:12 PM #11
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15-11-2013, 09:18 PM #12
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16-11-2013, 10:43 AM #13