Mitsubishi Ductless Splits Mr. Slim

[local 832s]

Polar is the key. L1 needs to go to L1 l2 to L2 and so on. This is from OD unit to ID unit.

[dismas66]

I wanted to Strangle this Electrician.....
after smokin the Board


The Indoor Unit is 115 V

The Outdoor Unit is 220 V

DC12 V (POLAR)
from the outdoor unit......to the Indoor Unit


It is Possible the BirdBrain Electrician Crossed the Wires

This would Definetely Smoke the Board

[dismas66]

Just called the elec.

He used the same breaker .. 20 amp for both the AH / Cond. unit

instead of running 2 seperate circuits

This can be done...but only with 3 wire + Ground
he used 2 wire

We Discussed the installation prior..
.using 2 sep. circuitshe was obviously trying to save on Materials

[Kevin O'Neill]

Were the instructions missing too? I put on in for my brother. I read the instructions FIRST. If you read them later, they are the CORRECTIONS!

The power for the indoor unit comes from the outdoor unit. (DC I Think) Do not wire the indoor unit directly to the AC power.

Good luck.

[Freezeking2000]

Just called the elec.

He used the same breaker .. 20 amp for both the AH / Cond. unit

instead of running 2 seperate circuits

This can be done...but only with 3 wire + Ground
he used 2 wire

We Discussed the installation prior..
.using 2 sep. circuitshe was obviously trying to save on Materials

I think you had better look for a Mitsubishi installer to look over this unit before you turn it on again, you just don't quite get it.

What is the exact model # of both units.

[agit8er]

I have installed no less than 30 Mr. Slim units this year. I still get a chuckle from reading the instruction manual. I have been using 14 awg tray cable from the outdoor to the indoor with great success. Our local codes require a form of disconnect indoors. We use the Mitsubishi 3 pole wall switch. It has t1,t2,t3 on one side and m1,m2,m3 on the other. Since the tray cable is clearly marked you can't go wrong. On the MS series just use "one" as L1, "two" as 2, "three" as N and "four" as ground. If it is a MSY, MSZ etc. use "one" as S1, "two" as S2, "three" as S3 and "four" as ground. Since Mitsubishi requires you to break all three legs than why not use their switch. Not to mention the fact it looks better than a disconnect box on most indoor installs. For those who have never seen tray cable....It is a Black cable with four inner wires each clearly marked with "one", "two", "three" and "four".

[agit8er]

I have installed no less than 30 Mr. Slim units this year. I still get a chuckle from reading the instruction manual. I have been using 14 awg tray cable from the outdoor to the indoor with great success. Our local codes require a form of disconnect indoors. We use the Mitsubishi 3 pole wall switch. It has t1,t2,t3 on one side and m1,m2,m3 on the other. Since the tray cable is clearly marked you can't go wrong. On the MS series just use "one" as L1, "two" as L2, "three" as N and "four" as ground. If it is a MSY, MSZ etc. use "one" as S1, "two" as S2, "three" as S3 and "four" as ground. Since Mitsubishi requires you to break all three legs than why not use their switch. Not to mention the fact it looks better than a disconnect box on most indoor installs. For those who have never seen tray cable....It is a Black cable with four inner wires each clearly marked with "one", "two", "three" and "four".

[stickball]

220 vac is 2 @ 110v and a ground
110/120 vac is 1 @ 110v, 1 @ nuetral, 1 @ ground
and I'm just an elevator mechanic
g'luck

[Geotherm]

220 vac is 2 @ 110v and a ground
110/120 vac is 1 @ 110v, 1 @ nuetral, 1 @ ground
and I'm just an elevator mechanic
g'luck

There is no ground (correct term is neutral) wire in a single phase residential 220VAC circuit; it is run from the 2 hot (live) wire from the entrance panel.

The quoted model is 120V AC fed straight through from outdoor unit to indoor unit. 120VAC going to outdoor unit (L+N), same power circuit plus a control (signal) wire go to the indoor unit (and a ground wire to ground both units.) It's very clear in the installation manual. Check the wiring to see if it matched instruction. If 230VAC was fed to the outdoor unit by mistake then the control boards in both units may be damaged.

[Kevin O'Neill]

There is no ground (correct term is neutral) wire in a single phase residential 220VAC circuit; it is run from the 2 hot (live) wire from the entrance panel.

There IS a ground in a single phase 220 volt residential circuit, but NOT a neutral. The ground is for safety and is not normally a current carrying conductor. There are also two hots.

There is both a ground and a neutral in a residential single phase 110 volt circuit, but only 1 hot.