I'm going to purchase a Gree 30K btu unit with 4 - wall units. I've been looking at the control wiring and have a question. I emailed Gree tech dept but they just repeated what the install manual has. My question if the wall units are connected in daisy chain will I be able to have each unit set at a different temp or even off while others are running.
Gree 30k btu mini split with 4 wall units control wiring?
- Thread starter zmann96
- Start date
I don't think they would even work on a daisy chain if not outright be damaged. Each indoor unit has it's own home run control/power wiring and refrigeration lines to condenser. I like the AC Service Tech YouTube channel for study.
That's what I feel but the install manual and the Gree tech both say it's daisy chained. this is what the tech sent. They have remotes so i wasn't planning on having a thermostat. " D1D2 terminals are daisy chained from 1 IND to the next. The H1H2 terminals are connected to the wired controllers which you can set the temp ". I want to be able to set 2 in the living room at same temp, my kitchen at another temp and my bedroom off during the day.
beemerphile
Well-known member
The outdoor unit needs a way to know which zone is calling for heating or cooling. The wireless remote does not provide this control to the outdoor unit. If this is the unit you have, page 27 shows the customary three wires plus ground going to each indoor unit from the outdoor unit...
Gree 4 head installation manual
Gree 4 head installation manual
that's the unit I'll be getting but the manual I have for the unit gives me a daisy chain connection
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beemerphile
Well-known member
That is not what the diagram is showing you. That is the wiring between the indoor units and the wired controllers. It is not the power and control wiring between the indoor units and the outdoor unit. I am sure that if you remove the covers on the outdoor unit you will find a place to land three wires plus ground from each wall unit.
You probably don't need a wired controller. The thermostats are in the wall units, and not in the wireless remote. There is a thermostat in the wall controller that you can use instead of the one in the indoor unit. You can walk your infrared remote around to each indoor unit and set its temperature set point and other control functions. However, each indoor unit needs a home run to the outdoor unit with three wires plus ground. I use #14-4C THHN-PVC Tray Cable for the runs to the outdoor unit. My experience is mostly Mitsubishi and I have never installed a Gree, but from the manual the principles are the same.
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wireless remotes
beemerphile
Well-known member
If you are not using wired controllers, then the diagram you posted is not applicable to your installation.
I'm getting the GMV-80WL/C-T(B) and 2- GMV-ND1.8G/B4B-T and 2- GMV-ND2.8G/B4B-T
I already purchased a spool of the #14 -4C tray cable so I can run it to each location. I was trying to find out before I get the unit if they are home runs from each unit. That was my assumption that I don't need the daisy chain of controllers hooked up if I'm using my remotes
Any specific reason you went with this model?
Guys, this is a Gree Multipro, a VRF model, more of a commercial unit, completely different from the typical residential multihead units.
https://www.greecomfort.com/assets/...dler/documents/air-handler-service-manual.pdf
Pretty sure that each indoor head is powered independently and there is a communication wire that can be daisy chained. I don't believe the 14-4 wire is of any use with this model.
I was told that the VRF is more efficient. this is confusing because here's the power diagram from ODU to IDU. Do I understand you correctly, if I wire the power like the diagram I won't need the control wiring because I have my remotes?
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Also the ODU has only one refrigerant connection not 4 zones. the lines use Y pipes to each IDU
I am at a loss as I have never installed one. I did some Daikin units a few years back, hell, I even sold Gree for a few years, but never got training or installed a Multipro.
You will need to study the installation manual well and do what it says, but the line sets and wiring is different from the residential units so don't let the other comments confuse you. Pretty much every thing mentioned in this thread doesn't not apply to the Multipro.
Thank you, I appreciate all your input.
beemerphile
Well-known member
True. That’s why I published the link for the reference I used so the OP could confirm that we were talking about the same thing. We weren’t.
fitter30
Well-known member
All minis are VRF doesn't matter if their a heat pump or straight cooling. All units have to be set either cooling or heating not both. They can have different set points.
electroman187
Well-known member
I'd be shocked if the indoor units cannot be independently controlled. You should be able to turn on/off each head and set the temperatures independently. You will not be able to set one unit for heat and another for cooling.
BTW, I have a Gree which I installed myself. It works fine - no major complaints but I cannot even get a hold of human for basic questions regarding items in the operators manual which are not well detailed. They absolutely shut you out unless you have an HVAC license. To be frank, I'm disgusted. I'm not sure how you even got a response for a tech.
BTW, I have a Gree which I installed myself. It works fine - no major complaints but I cannot even get a hold of human for basic questions regarding items in the operators manual which are not well detailed. They absolutely shut you out unless you have an HVAC license. To be frank, I'm disgusted. I'm not sure how you even got a response for a tech.
Thanks for your response. The tech didn't clarify anything, just repeated the manual. I understand how the power is connected it's the control being daisy chained. I don't understand the control wiring. I know the ODU has to receive a signal from the IDU but with those being daisy chained, I can't understand how the remote will operate each on independently. I would think each IDU would send a signal to the ODU separately. so 4 separate runs to the ODU.
Where in NH are you from? I'm in Laconia. I may be able to help you get some tech questions answered. Is there a way to PM me on this forum?
With units like this each indoor head and the outdoor unit should have a ID number. You might set this ID number on installation. The control wiring that runs from each unit to the outdoor unit sends in basic terms, computer data. Everything communicates sending data back and forth. it is not a simple on and off command. The indoor unit sends a stream of date saying this is unit #1 and I need to run at 50% output in cooling, or something similar. There is probably a whole **** load more info being sent back an forth and shared by all the units., such as coil temps, return and supply air temps and more.
Residential units send back and forth similar data, but they have control terminals and refrigerant connections for each indoor unit. I would assume there is a lot less data being shared.
We did Daikin VRV units and with the correct thermostat the you could pull up information and the equipment would tell you it is low or needs more refrigerant and how much to put in.
I did building automation for a few years. It is crazy the amount of information controllers will and can share on a 22 gauge twisted pair wire.
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Thanks again for your information. I get the power being daisy chained but I still can get my head around the control wiring being daisy chained. I attached the diagram for the control wiring. I've searched online for the remote monitors that are wired from G1 and G2 are these thermostats. the manuals come from China and are not always clear in our terminology.
mike93lx
ALLIANCE MEMBER
If the manual says to wire it that way, that is what i would do. Unless the outdoor unit has separate connections for each zone, a home run wouldn't do you any good anyway
I agree it's an easy run but it's the SOMEHOW that I want to understand. I did find the ODU wiring diag yesterday. the previous diag was for the IDUs Does anyone know what the wired controllers are ( guessing thermostats ) and are they needed if I use the hand remotes. Also the ODU has a centralized control network ( is that if I set up with computer) I also found out the ODU has the capabilities to heat hot water. ( Hydro box ) . won't be using that. I am setting up a 5 loop radiant heat system, have 2 loops running now. I have an 80 gal NG efficient water heater supplying domestic hot water and supplying hot water to a heat exchange then to a 5 loop manifold.
BTW where in Maine, I work all over in Maine.
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dcg9381
Well-known member
I'd wire it that way (the diagram is pretty clear). I know it doesn't make sense visually if you're thinking about simple analog signals, but I'll bet it's digital. If you want to figure out the "how" - you'd need to find some sort of troubleshooting manual. You might also look into configuration of telling it which unit is where for general answers.
You're probably right. all the manuals are written in China so it make me question. they call the insulation cotton I'll contact the company and see if the controls are digital
mike93lx
ALLIANCE MEMBER
Why does it matter? You are going to waste a bunch of time to not change anything. I bet anyone you can get won't know anyway
Why bother? The controls are digital. Who ever you call probably will not know. Just wire it up like the book says. Also, I would use a separate wie, don't use the 14-4 you bought and don't run the wires right beside each other. Usually they call for a twisted pair wire for this.
I have both 14 -4 twisted and the 16 - 2 twisted. they do say not to run close for interference. thank you
What does it say on the 16-2 wire?
the 16 - 2 is for control wiring daisy chain
2C 16AWG SHIELDED 3038058 (ETL)
justinjoyal
Well-known member
Where did you purchase the system ?
It’s definitely not a North American model.
It’s definitely not a North American model.
all I can say is thru a friend