moondawn
08-05-2013, 07:08 PM
Hi all
I been called to the above system has two indoor units connected. the error code U0 i think which equates to shortage of refrigerant. noticed suction was at 12 bar on r410a this is inverter however and that coil are off temps were around 10 deg diff.
tried on heat mode would not reach its target condensing temp of 28 bar was around 24 bar.
spoke with daikin about possible sensors causing this problem as the unit runs for a while then goes into fault.
first daikin guy said check sensors which i said i have the app on my phone for and i can get the resistances from there. he said the discharge temp thermistor on the app is different to all the air and coil thermistors however for this unit it is the same as an air or coil thermistor so will not read like the normal discharge thermistor which is around 10x a normal resistance reading. he said the bigger systems sky air and vrv require reading the discharge thermistor section 10x reading. however it does not mention this on the app.
carried out checks discharge thermistor a few k ohms out so decided to ring back and spoke to someone else who this time told me discharge sensors are all 10 x a normal resistance reading and to disregard what i originally got told. left me very confused so i asked him to ask his collegues whilst i was on the phone and he said its in blue and white mate ie black and white lol but the app is blue and white.
if the above is true then the discharge thermistor is miles out had original reading of say 50 deg c at 5.26k ohms and at 24 deg c when i removed thermistor off the pipe and clamped temp sensor straight on to it it read 19.40 k ohms if the second guy is to be correct it should read around 208 k ohms.
So to be sure i have reclaimed and verified the charge which is correct so it may be the thermistor is out. causing this situation. i have checked all the other thermistors air/coil these are fine.
1. so is this correct then are all discharge thermistors a higher resistance?
2. If so is this the same for most kit ie, mitsi toshiba sanyo fujitsu etc.
3. could there be anything else causing this fault of shortage of refigerant.
thank you
I been called to the above system has two indoor units connected. the error code U0 i think which equates to shortage of refrigerant. noticed suction was at 12 bar on r410a this is inverter however and that coil are off temps were around 10 deg diff.
tried on heat mode would not reach its target condensing temp of 28 bar was around 24 bar.
spoke with daikin about possible sensors causing this problem as the unit runs for a while then goes into fault.
first daikin guy said check sensors which i said i have the app on my phone for and i can get the resistances from there. he said the discharge temp thermistor on the app is different to all the air and coil thermistors however for this unit it is the same as an air or coil thermistor so will not read like the normal discharge thermistor which is around 10x a normal resistance reading. he said the bigger systems sky air and vrv require reading the discharge thermistor section 10x reading. however it does not mention this on the app.
carried out checks discharge thermistor a few k ohms out so decided to ring back and spoke to someone else who this time told me discharge sensors are all 10 x a normal resistance reading and to disregard what i originally got told. left me very confused so i asked him to ask his collegues whilst i was on the phone and he said its in blue and white mate ie black and white lol but the app is blue and white.
if the above is true then the discharge thermistor is miles out had original reading of say 50 deg c at 5.26k ohms and at 24 deg c when i removed thermistor off the pipe and clamped temp sensor straight on to it it read 19.40 k ohms if the second guy is to be correct it should read around 208 k ohms.
So to be sure i have reclaimed and verified the charge which is correct so it may be the thermistor is out. causing this situation. i have checked all the other thermistors air/coil these are fine.
1. so is this correct then are all discharge thermistors a higher resistance?
2. If so is this the same for most kit ie, mitsi toshiba sanyo fujitsu etc.
3. could there be anything else causing this fault of shortage of refigerant.
thank you