Mitsubishi City Multi Project (R2 series)

[soleowner]

Near Los Angeles, California - Replaced existing EMI ductless heat pump system with a Mitsubishi Electrical CITY MULTI R2 series system. We replaced 14 multi zone ductless systems (one outdoor coil to four indoor coils) in a five story historic hotel while occupied. The replacement system had five 12 ton outdoor heat pump units and 56 high wall indoor units with central control system. Each floor had one system of 12 indoor coils. The BC Controllers (Magic Box) was centrally located at each floor. Each indoor unit has a simple controller and isolation valves. Approximately 264 flare nuts were torque wrenched using clicker type adjustable torque wrenches and five different types of heads. Pink flags indicate brazed connections.

Project took four months to complete with 5 men.

I'm now open for any and all questions.

[amickracing]

Ah, that makes me cringe! Still having flashbacks from my last mittsy install. They are good units, but a bit more room in the unit would make life much easier huh?

Looks awesome though, where did the condensate end up going?

Nice to see someone else brings a fire ext when they are doing work that might cause smoke.

[soleowner]

Hey, thanks for asking. The condensate lines were existing 3/4 copper. We used draino and tested the drains separate times before commissioning the system.

Fire Safety is very important. The fire extinguisher is standard issue.

[lolson]

Them Mitsubishi is a different animal for sure, cool though.

[beachtech]

man that is very sweet!!!

[manny238]

great system..we installed one of these 410A city multi systems in a 7 story historic building in downtown phoenix area....never had any problems with it other then at start up, but since then its been workin perfectly fine with no service calls (knock on wood);)

[soleowner]

Hi Manny, We have had the same luck. City Multi systems have a compressor failure rate of .04 %. What was the make up of your 7 systems?

[manny238]

well actually the city multi system was only for the 2nd floor.....the rest of the building was controlled by chilled water 2 pipe system....we ran 2 sets of line sets inside an old stairway shaft all the way to the roof.....we had 2 units on the roof...dont know the model numbers but one had a single speed compressor and a variable speed compressor....the other one only had a single speed with 7 indoor units for each unit....im still really surprised none of the flare fittings leaked with it having 410A refrigerant....all the refrigerant piping was exposed too...so it came out pretty nice...hopefully one day i will make it back there to take some pics..

[furnacedoc]

where did you get that torque wrench?

[Air Tight]

Manny, I am looking at installing the city multi W-series. Its a geo-thermo system in a multi unit complex. I am assuming you went to the class held in Irvine? One of the questions I had was answered by your pics. I was wondering about presure ports but it appears they are on the ball valves or are they a separate part? I have the same question, Where did you get a tubing torque wrench? Your system looks very nice. We also have 4 Hp's and 31 units going in. I will put my email in my profile. If you don't mind me asking you some questions. Email me please.

[soleowner]

My name is John. I'm the poster of this system.

Yes, I went to all the classes to achieve the Diamond Dealer and Diamond Designer recognition. I highly recommend going to the City Multi Service coarse.

The isolation valves are not included. However, some distributor's include the iso valves in the quote assuming you really need to use them. Down in LA, the distributor chooses to separate the iso valves. Getting the isolation valves is not necessary for the system to operate but it is a good measure to take.

I used five different spanner heads on six different flare nut sizes.

Email me and I will answer the torque wrench and other questions in more detail.

John

[oldertech]

Did you use a flaring tool made for R410A? The shoulders are wider and seal better.

[soleowner]

Did you use a flaring tool made for R410A? The shoulders are wider and seal better.

Bought a new imperial flaring tool, made sure the flare length was the same as the flare. Pressure tested for 24 hours at 600 PSI. The flaring tool was not special.

[HVAC/R Man CO]

Great job. Weve done 2 mitsis in the last 2 years for the county, historical buildings. I love em.

[oldertech]

The R2 series is especially cool. John do you go for the extended warranty? I am doing "factory" start-ups but so far none of the customers have asked for the extended warranty.

[soleowner]

The R2 series is especially cool. John do you go for the extended warranty? I am doing "factory" start-ups but so far none of the customers have asked for the extended warranty.

Yes, the extended warranty is easy to get if you follow the steps. I paid for the FSR to come down and visit the site. It only took him 4 hours to bless five outdoor units and 56 indoor units. I aced it.

The CITY MULTI systems are engineered better than any other piece of equipment I've laid my hands on over the last 23 years.

[soleowner]

few of more pix

[furnacedoc]

where did you get that torque wrench i have been looking for one

[soleowner]

where did you get that torque wrench i have been looking for one

I can get it for you. Email me for details.

[oldertech]

I am looking at a job with 20 outdoor units. I haven't counted the indoor. I sure wish this contractor paid as much attention to detail as you do.

How could he record 2 hrs of run-time data for each of the 5 units in only 4 hours? The only way I know would be to have at least 3 computers recording for 2 hours then switch units for the other 2 hours of the 4 hours......hmm

[houtonjr]

that job looks great glad to see work like that around here

[soleowner]

How could he record 2 hrs of run-time data for each of the 5 units in only 4 hours?

Since this was my first installation, I had the FSR there to verify my work. I collected the data and submitted the paper work sometime later.

[gas1]

CPS has a mini split tool kit with torque wrenches and flare tool gauges and other good stuff for mini about $300. call a supply house or Lennox has them

[chilliwilly]

Near Los Angeles, California - Replaced existing EMI ductless heat pump system with a Mitsubishi Electrical CITY MULTI R2 series system. We replaced 14 multi zone ductless systems (one outdoor coil to four indoor coils) in a five story historic hotel while occupied. The replacement system had five 12 ton outdoor heat pump units and 56 high wall indoor units with central control system. Each floor had one system of 12 indoor coils. The BC Controllers (Magic Box) was centrally located at each floor. Each indoor unit has a simple controller and isolation valves. Approximately 264 flare nuts were torque wrenched using clicker type adjustable torque wrenches and five different types of heads. Pink flags indicate brazed connections.

Project took four months to complete with 5 men.

I'm now open for any and all questions.

Very neat and tidy job it reminds me of the Isovel package units we use to do in the eighties.

Trying to get a job in aircon now is really hard even just putting splits in. Especially when you haven't been in the game full time for over 25 years.

They look down their nose at you, even before you can tell them you have kept your hand in doing fridge work and have experience in installing the Mits ecolution SRK and FD range of VRF splits, which are an excellent choice if the install budget is there. Then they look suprised that you know something they don't.

I fit a couple of Mits FDKVA systems in a couple of cafes a couple of years ago. That I picked up cheap that were about a year old and had no problems exept the usual teething stuff like air handling filters not being cleaned and customers expecting heat pumps to kick in straight away.

This might seem like a daft question but are the two right hand pipes in the pic high and low pipes if so how come they're not armourflexed up?

And did you have to use the flaring tool that doubles over the flare for 410a? I was lucky as I managed to salvage the pipework as well as the units, and left the pipe tails connected to the units and just brazed new pipe in between.

[soleowner]

Very neat and tidy job it reminds me of the Is

This might seem like a daft question but are the two right hand pipes in the pic high and low pipes if so how come they're not armourflexed up?

And did you have to use the flaring tool that doubles over the flare for 410a? .

If you are referring to the isolation valves, the photo was taken before they were covered. I made armaflex/velrco boots with the stem cap sticking through.

Typical flaring tool. Not 45 degree.