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Thread: daikin vrv's
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07-10-2005, 09:41 AM #1
daikin vrv's
Hi Frank,
Got a problem with a VRV that keeps going out on E4 (LP Switch).
Other engineers have check the switch and it isnt going out. After suggestions from Daikin the compressor and the discharge line sensor have been replaced. Is there anything else on the system that could cause an E4 fault
Regards
Fatboy
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07-10-2005, 11:08 AM #2
Re: daikin vrv's
Originally Posted by rdocwra
How can a system with a dead pot trip an LP switch?
.
________
Lincoln Continental Mark IVLast edited by Argus; 07-02-2011 at 08:38 AM.
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07-10-2005, 06:36 PM #3
Re: daikin vrv's
Hi Guys,
I wrote the original post while i was in the office before going out to the job just in case someone had come across this before.
Today, was the first time i had been to this site for this problem, apparently this problem has been going on for months with sucessive engineers failing to find the fault.
The VRV is a RSXY5GY1 and it runs 7 indoor ceiling systems on 4 controllers (One controller does 4 units the other 3 have seperate controllers). All the controllers show E4 fault. In the past engineers have fitted equipment onto the LP switch to see if thats playing up but no good. I think the pot was changed in case that was throwing a wobbly.
Now today, i have reset all the controllers and run them on test mode and all OK. Check gas 10bar discharge and 4.4bar back pressure (Seems high for R22) fans indoor and outdoor all ok and suction frosting back to pot. All units set to 23 degree C on cool mode. Checked LP switch wiring and all OK.
The problem in the past i am told is the unit works fine for a couple of weeks and then throws his code up for no apparent reason
Any Ideas anyone
Regards
Fatboy
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08-10-2005, 03:23 PM #4
Re: daikin vrv's
I may be wrong!!! but best guess is that if all 7 units are running and you have 10 bar hp then system is short of refrigerant. 10 bar 150psi approx. is low for r22. 4.4 bar 65 psi approx seems ok. when the temp decreases and units begin to shut down on thermostat {4 on one control and 3 single} the suction will drop {possible lp fault}. as far as my knowledge of daikin goes the inverter will slow down and after that a hot gas unloader will open {rsx10h} have you tried running just one ahu to see what happens. i have {more than once} come accross a daikin unit where the "self diagnostic" fault code bears no relation whatsoever the system fault. good hunting.
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09-10-2005, 03:58 PM #5
Re: daikin vrv's
Hi Guys,
Thanks for the replies, The only thing that concerns me is that the VRV is already frosting back to the compressor. Surely if i put more gas in then this is going to get worse ?
Regards
Fatboy
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10-10-2005, 09:32 AM #6
Re: daikin vrv's
I have to say, that I do not have many experiences with G-series, this is quite vintage model, but...
First of all, the LP switch should be tripped under 2bar.
If you were there and it tripped over this pressure, the switch is wrong. But it won“t be your case I guess because of frozen suction pipe.
Second thing you should check is the low pressure sensor. Unfortunately, I do not know what pressure sensor is really there. Check the supply voltage 5VDC between black and red. The output voltage (If there are 4 wires - between black-green or white, one is not connected, if there are three wires between black and white):
Low pressure = (Outp. volt - 0,5)*10/3
Check with gauge manifold.
Then, if this is OK, check the subcooling at test mode, if there is no subcooling, there could be refrigerant shortage, but if there is some subcool, refrigerant shortage is not your problem.
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10-10-2005, 02:55 PM #7
Re: daikin vrv's
Yes, agree with martind. If the above is OK. the you have to replace the outdoor PC card.
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10-10-2005, 03:44 PM #8
Re: daikin vrv's
Firstly i am assuming all 7 units are calling for cooling so th cond. unit is fully loaded, are the coils and filters clean. heavy suction frosting sounds like poor evaporation in any situation but you state that all machines are set for 23c so this {in theory} should not happen. the only true way to determine your charge is to recover and weigh back in. i know this sound like a real ballache {and unnecessary if you know what your doing in the first place} but i did this on an rsx10 and found 6kg short much to my disbelief. system charge must be added to calculated extra for pipework and ahu's. this will eliminate any doubt over gas related problem. all the info on this should be in the original daikin installation book if they have it. i still wouldn't rule out circuit boards. in short "it could be ****ing anything!".
Last edited by slingblade; 10-10-2005 at 03:59 PM.
Takes a licking, keeps on ticking.
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11-10-2005, 07:15 AM #9
Re: daikin vrv's
Code E4 blinks for 'G' series either low pressure switch set value out of calibration.
Low pressure switch activates due to shortage of refrigerant or clogged piping.
Defective Outdoor PCB. or pressure sensor defective.
With a high pressure of 150psig for R-22 will be consider under charge.What is your ambient outdoor air temperature?
But with a suction pressure of 65 psig definitely you can't get any frost on the suction line, 65 psig for R-22 is above freezing point of water.
I think there are more to check on the system, either you may have an erratic pressure gauge.
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11-10-2005, 06:04 PM #10
Re: daikin vrv's
Hi Guys,
Ambient about 18 degree C, Pressures via Manifold gauges as no gauges on unit so should be correct to within a couple of PSI.
Diffinatly frosting back to the compressor.
Looks like someone needs to spend some time there and climb into the roof and check over the indoor units.
As usual didn't have too much time on site, Oh the life of a Refrigeration Engineer is such a busy one
Regards
Fatboy
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11-10-2005, 10:10 PM #11
Re: daikin vrv's
That is the best work. No time, customer standing behind you, and mysterious problem. Tomorrow I have to go for something like this. I really like my job sometimes :c
Just make checks of the LP switch and sensor. The compressor frequency is controlled according to LP = 5-6 dg. C. If the low pressure is wrong measured, then the frequency could be higher >> system goes to low pressure.
If the LP sensor is OK, you have to check temperatures after all indoor units, as you already mentioned and the liquid temperature.
Good luck
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12-10-2005, 04:01 AM #12
Re: daikin vrv's
Originally Posted by rdocwra
18 degrees outdoor will never turn 'ON' the compressor with a thermostat setting of 23 degree.
Unless you have a very high heat load found in the air-con room.
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12-10-2005, 08:56 PM #13
Re: daikin vrv's
Hi Raymond
Sorry for the delay in responding but today is the first day back after a well earned break in the SUNSHINE
Over the years, I have learned that whatever the Daikin fault code says is 99.9% true. Computer logic only has one path.
If you are getting an E4 fault then you have a low pressure system malfunction.
This could be caused by a number of things,
Failure of low pressure switch
lps wiring is broken or faulty
failure of lps connection to pcb
loss of refrigerant charge
failure of outdoor pcb
cause related to system as a whole (their words not mine )
malfunction of refrigerant piping circuit
Now, without a crystal ball or site visit (chargeable at reasonable rates ) I would have to look at the symptoms step by step:
1) system runs and fault occurs randomly so no loss of refrigerant
2) system runs for 2 weeks (as per previous post) so it is an intermittant fault - could be faulty wiring, pcb fault, lps fault etc.
to check the switch and wiring it would be safe to link out the connection to the pcb for a couple of weeks as it seems the gas charge is OK.
If the system runs Ok with the switch bypassed then it would not indicate a fault with the pcb or refrigerant circuit
And you mention that the system frosts back to the compressor. I would look toward the circuit piping (is it within maximum distances?, any kinks in the pipework?, does the compressor ramp up and down excessivly?, are the indoor units within the index allowed? etc.
It is very difficult to pinpoint the fault from a distance but you must use logic.
Can you post a list of the indoor model numbers? with this I can determine the index rating
I have a piece of kit that connects to the pcb and tells me what every part of the machine is doing at any particular time on the laptop - very useful in these situationsLast edited by frank; 12-10-2005 at 08:58 PM.
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12-10-2005, 10:42 PM #14
Re: daikin vrv's
Hi Frank,
I will pass that on to my boss (Cooling-gurus) and let him sort out what our next step is.
I will send you a PM as i need to ask about things but not on the forum
Regards
Fatboy
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15-10-2005, 11:09 AM #15
Re: daikin vrv's
Hi Frank,
Just good the unit details from the file in the office
According to our records the outdoor is a RSXY5GY1 and it feeds 4 x FXYS25G's 2 x FXY40G's and one FXY32G. all the indoors are on the ground floor. I dont think the pipe run is excessive it certainly shorter than some i have seen. What is the maximum pipe run on these units.
Another question slightly related. When a unit comes precharged for a 15 meter pipe run i assume this is in total (suction and discharge meaning indoor and outdoor unit must be no more than 7.5 meters apart) is this correct or is it 15m on each suction and discharge
Regards
Fatboy
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16-10-2005, 06:56 PM #16
Re: daikin vrv's
Hi Raymond
I'll look up the Daikin details tommorrow at the office and post back. The maximum indoor outdoor distance for a G series VRV is 100m (loosely the same for most makes in the early days - pre R407c/R410A) with the first indoor unit to last indoor unit being 40m. So you could go 60m of pipe from the outdoor unit, then make your first indoor unit and then feed all the other units making sure that the they all fall within the 100m limit.
It increased to 125m for R407C, with the first indoor unit a maximum 75m from outdoor.
When the manufacturers state a maximum pipework distance it refers to a one way measurement so if it's charged for 15m sepeation then it can be 15m - not divided by liquid and suction lengths.
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17-10-2005, 09:29 AM #17
Re: daikin vrv's
to MrCoolingMagic:
This is good example E0
From my experiences E0 is common malfunction, if the indoor unit needs cooling and the outdoor does not cool from any reason, which could not be detected by any other protection.
E0 is descripted as an activation of protection device (fan thermal protection and overcurrent relay), but...
Some of E0 cases:
Instanteneous power failure - in many many cases
Inverter problem - totally burnt or some disconnection
Reversed phases (in case of older small Split units)
Outdoor PCB cold junction on some connector
Mechanically blocked compressor
etc...
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17-10-2005, 10:52 AM #18
Re: daikin vrv's
Originally Posted by bladesling
Care to elaborate.
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17-10-2005, 11:12 AM #19
Re: daikin vrv's
Man, this is the thread for your effusions.
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17-10-2005, 04:15 PM #20
Re: daikin vrv's
Originally Posted by bladesling
This is one of those jobs that you have to be in the right place at the right time. If anyone can sort these out it's normally Frank. Bladesling, i am surprised you have had many problems wih Daikin. Mostly they are more reliable than some other makes i could mention.
Regards
Fatboy
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17-10-2005, 04:27 PM #21
Re: daikin vrv's
Originally Posted by rdocwra
still the way he's going about it he won't be here long .
cheers
richard
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17-10-2005, 04:42 PM #22
Re: daikin vrv's
I have been following this thread with some interest
i like most have had dealings with daikin direct and through their agents some of which no longer exist
i have had warranty issues on replacement compressors which have been faulty at start up,when original compressor has run for years {different faults i might add) where daikin will not replace unles a serial no is given, and when you tell them it is nolonger readable they just shhoo you. i have experience of an agency selling warm climate heat pumps to a user in the uk (45 splits in total}so that in winter they do not operate in heating etc etc
i believe daikin are called daikin as ford already had the name anglia
my apologies to frank as throughout all my grief he has been of great help in sorting out all the c**p that generally ensues when you are called to a daikin installation:eek:Why on earth would somebody do that?:(
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17-10-2005, 05:25 PM #23
Re: daikin vrv's
Originally Posted by fridge51
Pretty much all the manufacturers know that most warranty calls are usually install related and if you are always having troubles on daikin sites then I suspect someone is giving away a lot more information about themselves that you'd prefer customers not to know..
A friend who was a warrenty tech for Mitsi (now operations manager for LG) would always always check to wiring first on any call he went on and usually this was the 'problem' not the kit
A lot of monkeys have got into this game over the last 5 years and it shows..
cheers
richard
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17-10-2005, 05:39 PM #24
Re: daikin vrv's
Originally Posted by bladesling
This is the best forum for discussing refrigeration /air conditioning I know and it's kept that way be stopping ijits and trolls from abusing it.
Alt.hvac was the best but look at it now..competely ruined by bad language and trolls spoiling it.
Look at fridgeman-something tells me you know this site... ruined by the mod allowing all sorts of stuff to go on so the serious guy's with information leave (and usually come here saying "what a breath of fresh air it is")
The only way for this site to continue it's good work is to stop this stuff.Others have been banned here for less than what you've posted thus far so don't feel persecuted BTW
Have a think about it and either join in and give us the benefit of your experience or go to either of the above mentioned and post there..
cheers
Richard
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17-10-2005, 07:42 PM #25
Re: daikin vrv's
As mentioned our Daikin warranty % is currently at naught. I agree we are not immune from technical problems but if you employ competent good quality guy's and work to a decent standard then Daikin will seldom if ever give problems.
One such problem was No.6 compressor failing on a VRV install. (26hp outdoor with 9 indoors rated at 52kw cooling.) Seems that the crankcase heater was incorrectly sized during design stage so that, when the last compressor was called, it just pumped all the oil out.
Didn't take long for the comp to fail, bearing in mind that the last compressor spent most of it's time waiting for the indoor conditions to approach maximum load.
We got paid all our costs including gas, time, expenses etc. - can't say fairer than that.
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17-10-2005, 07:46 PM #26
Re: daikin vrv's
Where has the fault code E0 been mentioned in this post?
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18-10-2005, 11:08 AM #27
Re: daikin vrv's
Pretty much all the manufacturers know that most warranty calls are usually install related and if you are always having troubles on daikin sites then I suspect someone is giving away a lot more information about themselves that you'd prefer customers not to know..
every body must have had the 10/12 week lead time on certain spares, and before daikin uk got together suffered at the hands of cvarious agents ( you know who you are)
as with every aspect of our industry as you rightly say, monkeys move in,unfortunately there are a lot of zoo keepers out there too
regards to all
phil thompson
service director
F T Refrigeration Ltd
www.ftrefrigerationltd.co.uk:eek:Why on earth would somebody do that?:(
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18-10-2005, 01:01 PM #28
Re: daikin vrv's
You are completely right gentlemen. Look at this thread. We were solving specific problem and one "reply" shifted this discussion to completely another direction.
We cannot do anything, only ignore such replies.
Banning users had to be done by site admin and I do not think, that he has so much time. Just be lucky, that this site exists, order must be maintained by ourselves.
Just to turn this thread to original position:
What is going on rdocwra? Do you have any info from your boss "guru"
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18-10-2005, 09:02 PM #29
Re: daikin vrv's
OK GUYS,
Back to the original Thread,
I managed to get back to the site today and get some more info. Apparently this fault only occures when the unit is on heat mode .
I have never seen a system controlled like this, although there are 4 seperate controllers in 4 different rooms in one of the rooms is a daikin panel with 2 toggle switches on it. The top one is fans to the left and temp to the right. The bottom switch, cooling left and heating right. By using this switch you lockout all the controllers into either heat or cooling mode (Does this make sense)
Anyway thats as far as i got today. Fault in Heat mode
Any Ideas Now
As for Cooling-guru he get his information the same place i do (Frank)
Regards
Fatboy
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19-10-2005, 08:35 AM #30
Re: daikin vrv's
The control with central cool-heat changeover is normal.
If the error is happened in heating mode you have simpler situation as you have to check temperatures only on outdoor unit.
If I should say anything without detailed informations, in heating mode could also be the reason of low pressure the electronic expansion valve in outdoor unit. But you have to be sure, that E4 is during heating and not during defrost.
If the error is happened only sometimes the best way to analyse this is the parameters logger. I know, that this is quite proprietary tool, but maybe you know somebody from DAIKIN who has this (the name is Daikin Service Checker). We in Slovakia are lending this to dealers if such problem occurs.
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20-10-2005, 04:51 PM #31
Re: daikin vrv's
With regard to more information for Ray, i can only give you more background on the fault, as i have had previousl engineers go to this site and carry out works as per Diakin Technical. The original complaint is the same, fault E4 occours intermittantly. Going back to the begining it all seems to start from a leak on caplillary line, which was repaired and recharged accordingly. Several calls to state the system was not working, on arrival the cutomer had reset the system and got it back working, making it difficult for us to pin point the fault. It then went out on code F3 after several checks Daikin suggested a fault with the internal valves of the compressor and the discharge pipe sensor. Unfortunately i was not convinced and went for the cheaper option of the discharge sensor. We then managed to find out that the receptionist was arriving in the morning and feeling cold tunred it on full heating then once warm tuned it down to Cooling to the original setting, this was an ongoing problem until she was told not to touch the controllers.
Again the fault re-occoured so we opted for the compressor replacment as per daikins advice. They then suggested a Tattle Tail to be installed on the Lp switch which we did and left for some time, this did not give us any further information except it didnt blow.
As suggested previously i think (bearing in mind i am not a A/c engineer) but as frank suggests LOGIC it must be either a PCB or Lp switch fault.
This is based on Discussions with Ray, but what do i know------------Not alot i can tell you
Obvioulsy changing the compressor and discharge pipe sensor on Daikins recommendations has proved that it wasn't that.
Thanks for all the advise being given i am very appreciataive of all the help.
Cheers
Cooling-Guru
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20-10-2005, 05:24 PM #32
Re: daikin vrv's
if the fault seems to coincide with the capillary I would look at
a charge
b moisture
then go from there..
cheers
Richard
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20-10-2005, 06:39 PM #33
Re: daikin vrv's
Hi Raymond
I've managed to look at the manual for the kit and can report the following findings
Outdoor unit = RSXY5GY1 (Index capacity = 162.5)
Indoor units = 4 x FXYS25G (index = 4 x 25 = 100)
2 x FXY40G (index = 2 x 40 = 80)
1 x FXY32 ( index = 31.25)
Total indoor index = 211.25
Raymond, the system is mis-matched The correct outdoor unit should be a RSXY8
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20-10-2005, 06:51 PM #34
Re: daikin vrv's
Thanks Guys,
I take on Richards point about moisture, i know the system has had a gas leak in the past and the problems only started after it been repaired but need to check if its had a drier.
Another thing, if this unit is going out on LP in Heat mode and the sytems is switchable so it can only run units in either heat only or cooling only (Not both at the same time) does this unit act the same as a split and reverse the cycle (Discharge becomes suction and vice Versa). If so if it goes out on LP is there another LP switch on the Discharge side (Suction on heat) or does the board somehow work out what mode it's in and run the LP anoher way.
The plan is to sit down with cooling-gurus and go through the file from scratch. Maybe the first step should be reclaim all the gas, weigh it, change drier(s) and recharge. The trouble is a system of this size is going to need a long vac out (Overnight possibly - any comments)
I knew i should of gone sick the day i first got this call
Regards
FatboyLast edited by Latte; 20-10-2005 at 07:17 PM.
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20-10-2005, 07:12 PM #35
Re: daikin vrv's
on any heatpump the suction going into the compressor is always the suction whatever mode it's running on.
therefore if you fit the lp by the compressor it will always measure low pressure
cheers
richard
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20-10-2005, 07:40 PM #36
Re: daikin vrv's
Originally Posted by frank
cheers
richard
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20-10-2005, 08:19 PM #37
Re: daikin vrv's
does this unit act the same as a split and reverse the cycle
The answer is yes. VRV units come in three types:
Cooling only
Heat Pump
Heat Recovery
The first 2 operate exactly as a split system would (or more accurately, a multi split) the third system is what defines the VRV system. Waste heat from one room can be used in another room or rejected to atmosphere.
A system is in balance when the heat absorbed is rejected together with the heat of compression. A VRV heat recovery system can maintain this balance under varying conditions, from fully cooling, across partialy cooling and simultanious heating to fully heating.
One thing that must be true though is that the system operates within the boundaries set by the manufacturer. If you try to operate a VRV system outside of the published data you will get unexpected results.
The intermittant LP fault you are experiencing is due to your system being out of balance. When the unit is operating in heating mode, all the indoor units are acting as condensers and send the liquid back to the outdoor coil which acts as the evaporator. As your system is not index balanced, the outdoor unit would be starved of liquid and would show low pressures.
In cooling mode, the result would be low capacity on all indoor units.Last edited by frank; 25-05-2006 at 08:05 PM.
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20-10-2005, 08:27 PM #38
Re: daikin vrv's
change drier(s)
The trouble is a system of this size is going to need a long vac out (Overnight possibly - any comments)
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20-10-2005, 08:30 PM #39
Re: daikin vrv's
Richard
The maximum index for a RSXY8 is 260, the minimum being 100
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20-10-2005, 08:32 PM #40
Re: daikin vrv's
There is NO drier to change on a VRV
I will show you some beauties around Christmas time.
Chemi
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20-10-2005, 08:40 PM #41
Re: daikin vrv's
Hi Frank,
My guess would be that the unit would not have had an 8 hour vac or a tripple break, a couple of questions though.
1) when would you break the vac, time,micron," of vac or just whenever.
2) Although no drier fitted originally, would you gain anything fitting a bi-directional
3) Even if i had a micron gauge (which i dont, not at £130 anyway) where could you fit it. Assuming you should fit it at the furthest point from the vac pump and you vac at the outdoor service ports where could you fit it. Are there any 1/4 service ports on the indoor units, ive never seen one
Regards
FatboyLast edited by Latte; 20-10-2005 at 08:58 PM.
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20-10-2005, 08:42 PM #42
Re: daikin vrv's
Originally Posted by frank
cheers
richard
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20-10-2005, 08:51 PM #43
Re: daikin vrv's
Originally Posted by rbartlett
RSXY8 Max 260 Min 100
RSXY10 Max 325 Min 125
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20-10-2005, 09:12 PM #44
Re: daikin vrv's
Frank/Richard,
Right, Here is my thinking
FACT:- We know the system was OK Before it had a gas leak so logic dictates tis is the first place to look
First, go to NRS and get a Midi reclaim bottle (we think system has about 15kg R22)
Reclaim gas and weigh, Fit Bi-directional, Tripple-vac Overnight, Regas and try.
Anyone have objections or suggestions.
I think i have got to start with the basics and go from there at least this way it eliminates gas. How do you charge a vrv if you dont know the pipe lenths. although this one should be within spec if the unit is underpowered or you dont know the lenghts what do you do. Pressures, Frosting back ?
Regards
RayLast edited by Latte; 20-10-2005 at 09:28 PM.
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21-10-2005, 06:23 PM #45
Re: daikin vrv's
How do you charge a vrv if you dont know the pipe lenths.
The problem here Raymond is that your system will not work correctly as there are too many indoor units connected to it. You have an imbalanced system.
For Daikin (RSXY5) on R22 the formula is
1/2" liquid line length (m) x 0.1 = ?
3/8" liquid line length (m) x 0.05 = ?
1/4" liquid line length (m) x 0.025 = ?
Add all the answers up and subtract 2. Add this result to the name plate charge and the system will be correctly charged.
However, in your case, as you have too many indoor units connected, the answer will result in an over charge.
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21-10-2005, 06:27 PM #46
Re: daikin vrv's
Reclaim gas and weigh, Fit Bi-directional, Tripple-vac Overnight, Regas and try.
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21-10-2005, 11:24 PM #47
Re: daikin vrv's
No additional filter/driers are required.
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22-10-2005, 01:40 PM #48
Re: daikin vrv's
i agree with frank, if it's not required then it's not required.
A more accurate expression of you perception would be "Yes, Frank, I understand".
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24-10-2005, 07:01 AM #49
Re: daikin vrv's
Originally Posted by Thermophysics
I thought this was a refrigeration forum and not some sort of analytical psych forum where 'they' try to analyse what 'they' think you really want to say.
Never thought at the possibility that he's just saying what he's saying/posting, nothing more, nothing less, with no other message behind the answer?It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
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24-10-2005, 08:38 AM #50
Re: daikin vrv's
Originally Posted by Thermophysics
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