split system cables

[zelig]

My new air conditioner is an LG inverter. Yet to be installed. I'm wondering about the cables. I'm replacing an older sanyo system that had an 8 wire cable between the indoor unit and the outdoor unit. This one just has a 3 pin plug on the indoor unit and 3 or 4 hardwire connections on the outdoor unit. So if thats just power, how do the units "communicate" with each other.

[elkangorito]

My new air conditioner is an LG inverter. Yet to be installed. I'm wondering about the cables. I'm replacing an older sanyo system that had an 8 wire cable between the indoor unit and the outdoor unit. This one just has a 3 pin plug on the indoor unit and 3 or 4 hardwire connections on the outdoor unit. So if thats just power, how do the units "communicate" with each other.

Have you tried the "internet"? If not, "Google" may be of some use.

[zelig]

Have you tried the "internet"? If not, "Google" may be of some use.

Didn't think of that. Thanks.

[lpg_falcon]

Some of the units I used to work on.
Fujitsu.
Use to put a Signal into the 240v lines between the two units to communicate.
It kind of looks like a spike when looking at it with an oscilloscope.

Tricky stuff.

It might be doing that.

lpg_falcon.

[zelig]

Hey I worked this out in the end. The manual says "connect the wires between the 2 units" basically. I reckon the lack of explanation is to prevent DIY. I had to run a 4 wire cable between the units. +,-, gnd and the 4th communication i presume. There was a small drawing of it etched in the plastic.