Mitsubishi twin splits.

[CraigF]

Hi all,

I'm going to be installing a twin split system soon (mitsubishi elec), I'd just like to know if anyone has any details or links to any manuals with regards to master and slave settings and measurements from refnets etc so I can get a bit of a head start! Any info much appreciated as always!

Thanks in advance

CraigF

[install monkey]

refnet equal distance between 2 indoors
s1 s2 s3 to both indoors
remote controller to 1 indoor only- no addressin as its classed as a single split

[CraigF]

Seems pretty simple stuff then! Cheers!

[CraigF]

S123 two separate cables from outdoor?

[install monkey]

all 410a mr slims 7-14kw 5/8 3/8 pipe and from each branch if 2x 5kw its 1/2 an 1/4- or 5/8 3/8 for 7 kw indoors
additional charge is based on total length of main run and the 2 branches

[moondawn]

S123 two separate cables from outdoor?

one cable a 4 core cable, usually use 1.5mm or 2.5mm 4 core sy cable.
S1 is live
S2 Neutral
S3 Comms
Earth to Earth terminal.

hope this helps

[CraigF]

Spot on mate! Am I cabling s1s2s3 in separate 1.5mm from outdoor unit or will that be daisy chain from one to the other? Sorry I'm a simpleton!

[install monkey]

outdoor to 1st/nearest unit then out on the same terminals to the slave unit

[CraigF]

Cheers moondawn as i was more thinking along the lines of an individual 1.5mm four core for each indoor from the outdoor unit mate.

[CraigF]

Cheers install! Cheers moondawn!

[moondawn]

Cheers moondawn as i was more thinking along the lines of an individual 1.5mm four core for each indoor from the outdoor unit mate.

Hi yeah one cable from outdoor condensor daisy chained through the indoors.
Beat me to it monkey

[Slim R410a]

Indoor that you connect the controller to becomes the master.
Standard configuration will take an average temperature from both indoor units return air to achieve your set temp.
This can also be changed via the PAR-30/31 to: (function setting mode 02)
Temp sensor to which the controller is connected to. (master indoor)
Temp sensor built into the controller.

Distance between refnet and indoors can be (iirc) 8m difference max between the two lengths but always good practice to keep them equal as IM said above. (check the manual that comes in the refnet box, not the indoor manual)

[CraigF]

Thanks slim!