Mitsubishi r2 test procedures ? And test results ?

[Cmsaircon]

Hiya all

I have installed 4 Mitsubishi r2 systems pury p350 ... I've had all units running in both modes with decent temps in both modes = 10*c in cooling 40*c in heating .
I've since added all units to g50 central controller and all units are visible and working .without any error codes anywhere .

However now 2 months later we are getting various call back issues regarding temps on the local controllers never getting near the 26*c that they ask for , people saying it says HEAT STANBY a lot , also that one unit blows cold when local controller says heat & heats when local controller says cool ( I doubt this is even possible I think it's more likely operator error ??)

I have noticed that the temp drop in the building is very high at night .. The average temp in some of the areas first thing in the morning is as low as 10*c despite these areas getting up to 24*c-26*c during the day .

We are due back to site Saturday to test all units in heat modes and provide our test results ... PLEASE could someone advise me best procedure to test systems ? and also what should be my air off -air on difference be ? etc and any other factors I could run checks and tests on . Will it be best to TEST MODE the systems ??

I have to prove that what's installed is running right and doing the job it's being asked to do !!

Thanks for any replies

[nike123]

And what makes you think that you will be getting more answers with spamming all forums with your same question? It is not polite to do that. Makes you to look like very selfish person, and who likes to help selfish persons.

And how you think that all answers will be on same place? Not very productive approach! Dont you think?

[Cmsaircon]

As I state on my profile line .. I'm new to this forum !!
I thought that would be the correct way to get my question read by someone who may be able to help . If there is an code of conduct to stick to accept my apologise .

As for selfish ?? Not really !!!! ..... But thank you for your swift reply to let me know your thoughts .

Good luck in your quest to get a decent job !!!

Feel free to contact my company I will look at your cv

[RusBuka]

Take M-net checker and look at all system. Or you need ****ing lot of experience to find whats happend by hands.

[install monkey]

http://www.mediafire.com/download/91...(HWE10050).pdf
click on link above for service manual

is there any lossnay units- is there fresh air onto the indoors?- fit duct heater or slow fan down and programme time schedule for when staff in- programme ac to start earlier to reach setpoint

are the filters clean- are the controllers set correct, ie not cool 26??

[marc5180]

It sounds like you have port numbers crossed. When you commissioned the system did you collectively put all indoor units on cool mode and then all indoor units on heat mode?
If you commissioned them this way rather than testing them individually on both modes then there's a chance the port numbers have become mixed up, this is a very common problem on systems after they have been commissioned.

Do you have a M-net checker, to look at the system? If you do then this can be rectified within 1 hour.

[Josip]

Hi, Cmsaircon

Welcome to RE forums ....


here you can find little more about RE rules ... http://www.refrigeration-engineer.com/rule

As I state on my profile line .. I'm new to this forum !!
I thought that would be the correct way to get my question read by someone who may be able to help . If there is an code of conduct to stick to accept my apologise .

As for selfish ?? Not really !!!! ..... But thank you for your swift reply to let me know your thoughts .

Good luck in your quest to get a decent job !!!

Feel free to contact my company I will look at your cv

it is not necessary to post the same question at multiple forums ...

that confuse you and other people replaying to you ... it is hard to follow conversation ...

then, sometimes you need to be patient ... we all are working people (making our daily bread at some other places like you) thus we are volunteers here and sometimes have no time to visit forums regularly ... also we are trying to give a good and accurate advice - we all know what is dead end ....

generally here are very good girls&guys like humans or like professionals, believe me

As per nike123 ... if you really need a good service man, he is your man - I guarantee for him - sometimes he is too fast and to furious, but never evil just contrary ... unfortunately, recently here jobs are very slow ...


Best regards, Josip

[Cmsaircon]

Thanks guys for the replies ... Yes there are lossnays fitted to supply fresh air .
YES I did test all units in same mode at same time :0( ... I will check ports and test units 1 at a time first job !! M-net checker ?? I've never come across this ? Is it a specialised tool ?

We will be doing a full filter clean too on Saturday so won't know filter condition til then .

I've been advised to put some of the units on night set back because of the dramatic temp drop between close / open times of the office .. Have you heard of this ??

[Cmsaircon]

Thanks Josip

I'm just getting hang of this forum and finding it brilliant so far .. Really good to be able to ask questions to really experienced guys from the industry .

Look forward to continuing on here

[marc5180]

The M-net monitoring tool is a tool that plugs into the 30vdc m-net line and enables you to see all of the operating parameters, including sensors, lev positions, connection info etc etc.

Best thing to do would be to put all indoor units on test cooling, after 15 mins put 1 indoor on test heating and wait to see if this starts heating. If it does put it back to cooling mode and then move to the next indoor unit and put this on heat mode and keep repeating the procedure until all indoors have been tested.
It may take a while to complete but I'm sure you will find this to be your problem.

[Cmsaircon]

Brilliant ... Thanks very much .

Saturday I will no where to start looking and things to check .

Mnet monitoring tool sounds like a piece of kit I would be interesting in using . Do you know best place to get this ?
Cheers

[marc5180]

Your welcome.

If you have any other problems with the system, post back and we will try and help you.

The monitoring tool is very difficult to get hold of, unless of course you are a partner of Mitsubishi and spend around 250K a year on their products.
Then you have to go on the training course and then you get it.... But you can get all of the data from the SW1 dip switches on the outdoor board.
Get your self a city multi service manual and the dip switch settings are in the back of the book.

[Cmsaircon]

I work as a sub contractor for someone that is a partner , I'm going get on them to get me on a courses ..

Cheers

Will let you know how it goes saturday

[install monkey]

setback temperature is programmed on the g50 so when the kit is off- you set the setback to say 16deg to prevent the room temp from dropping below this- vams should have a inline duct heater downstream of the duct- ideally thyristor controlled to maintain a minimum supply air of 16deg- set the vams to come on later than the rest of the kit, maybe switch the vams off for an hour- check your not gettin too much fresh air onto the unit, ensure sw1 ,1 is on on each indoor -if they have a local remote- otherwise a room sensor can be bought and plug it into where the return air sensor is plugged in, also a high ceiling void with uninsulated ceiling tiles,gaps in the cladding of the roof is a good cause of performance issues

[Cmsaircon]

Thanks again

[AbsoluteWDJ]

Hiya all

I have installed 4 Mitsubishi r2 systems pury p350 ... I've had all units running in both modes with decent temps in both modes = 10*c in cooling 40*c in heating .
I've since added all units to g50 central controller and all units are visible and working .without any error codes anywhere .

However now 2 months later we are getting various call back issues regarding temps on the local controllers never getting near the 26*c that they ask for , people saying it says HEAT STANBY a lot , also that one unit blows cold when local controller says heat & heats when local controller says cool ( I doubt this is even possible I think it's more likely operator error ??)

I have noticed that the temp drop in the building is very high at night .. The average temp in some of the areas first thing in the morning is as low as 10*c despite these areas getting up to 24*c-26*c during the day .

We are due back to site Saturday to test all units in heat modes and provide our test results ... PLEASE could someone advise me best procedure to test systems ? and also what should be my air off -air on difference be ? etc and any other factors I could run checks and tests on . Will it be best to TEST MODE the systems ??

I have to prove that what's installed is running right and doing the job it's being asked to do !!

Thanks for any replies

Are your additional refrigerant calculations correct, double check these. Check your BC ports as stated by others, also try and prevent the room temperature dropping to 10c, must be badly insulated building. If the system has to start with 0c ambient and 10c indoor ambient, it'll probably take most of the day to bring the temperature up, so if you think you got problems now, wait till the winter kicks in! What about the diversity? I've found some systems at 150% struggle in winter time, constantly defrosting. I think as an installer all you can really do is check the refrigerant calculation and have them verified by Mitsubishi Electric and check the BC ports are correctly addressed. If you've operational issues after that then I'd call in Mitsubishi but i'd be a bit concerned that the building is 10c in the morning!

[Cmsaircon]

Thanks to all your replies, I did find that 2 units were set incorrect ports hence the the strange temps ,
I ran all units in heat mode and all managed to get to there target set points eventually some longer than others ... I've raised the concern to the client as 4 rooms had a start temp point of 12*c on sat morning and its not even hit winter yet !! I've set these rooms to a 16*c night set back for now

But all in all everything is working and have fine and good test results to show this now .

Thanks again to all your comments

[marc5180]

Thanks for updating us, glad you got it sorted.