Sanyo Mini-Split Question

[jcom]

I have two Sanyo mini-split systems (KHS 1872 & KHS 2472) and I'm trying to figure out how to program their timers for the lights out period. Rather than a thermostat like most house HVAC systems where you can control certain temps for certain times, the Sanyo's only allow you to time them to either be on or off.

I want to have the temps at 82F during lights on (burning CO2) and for the temps to be 74-76F during lights off. The problem I have is that my dehumidifier and reservoir chiller for my RDWC system both put off a significant amount of heat. So if I program the mini-split to shut off, the heat from the dehumidifier and chiller threaten to drive temps up into the high 80s during lights out...just the opposite of what I want.

I've read the manual front to back and it seems stupid that I can't set it to 82F for one time period and 74F for another.

Unfortunately, since I have a sealed room, I cannot vent the heat from the dehumidifier or chiller outside...nor can I move them to another location.

Anyone familiar with these units and/or any suggestions?

TIA,

Jcom

 

[caljim]

I have the same problem with my Mr. Slim.

One way around this is to run the a/c through an environmental controler with a photocell to switch between day and night temps. The trade off is loss of efficiancy is your sanyo is an inverter unit.

When i was running window shakers the CAP Day and Night thermostat worked well when used as a trigger for a contactor that carried the load of the a/c.

Now, with the MR. Slim, when I find that the room is swinging more than 10 degrees I manually adjust the temp on the unit at lights out and on. Kind of a pain in the ass, but you do what ya gotta do to keep on point.

 

[youngtrader9689]

raise your day temps to 85 and 80 will be just fine for night. keep stretch down too

 

[jcom]

raise your day temps to 85 and 80 will be just fine for night. keep stretch down too

The problem is that I cannot do this. The remote control is the thermostat and it has a one temp setting...meaning it's either on (say 82) and heating or cooling the room to stay at 82...or it is off (when the timer is programmed to shut off). And, again, if I have the timer set to turn off for lights out period, the chiller and dehumidifier actually raise the temps in the room (it hit 89 the other night). Guess I'm better off just keeping the room at 82-84 all the time?? (lights on and off)

 

[Puscifer]

Buy a wired remote for it.
You'll have to do some searching though 'cause Sanyo recently discontinued it's wired controllers. Try calling a place that used to sell them (the wired remote) and they should be able to point you in the right direction.

 

[Puscifer]

OR, you can just keep it set at one temp all the time. That's what I used to do before I bought a wired controller for my Mr.Slim.
I run a dehuey at lights off so the heat from it is enough to keep the mini split running even though theirs no heat from the lights.

 

[growingcrazy]

Why not just use a temp controller? Day and night temps and the ac is just set on high. They controller turns the ac on when you need cooling, off at the desired temp.


Are there any hookups on the unit that allow you to use a home thermostat to control it?

 

[HUGE]

First problem is you bought a Sanyo mini split. I know your pain I have one. You are basically fucked. Either set it and forget it. Or buy a day night controller and keep it on full blast. Neither is a good solution. Fortunately for me my Sanyo isn't strong enough to completely cool the room so most times I set it at 78 and when lights on I'm at 80-85 and lights of 72-78. Depending in the time of year. Also watch out for low ambient tempos because the unit will shut off if outside gets below 50. You can cut the temp sensor off and install resistors to matchbox value but it will turn into a block of ice if it gets below 32 so you will also need to install a low ambient kit which probably won't work because the board has a safety that kicks the unit off if the fan stops. Yes I know all this from first hand experience. Can't wait to blow another 3k to replace this working A.C..

 

[Vegan]

I have a FEDDERS and ran into the same thing. It has a comfort setting which is supposed to keep the room at a constant 77deg, needless to say the calibration is off, it ha a 3 degree built in diffrential rate, that is more like 7 degree difference. She runs twenty four seven, high of 82 day, 71 at night. Dehuey runs any unwanted humidity out of the room 24/7 via drain tube to outside, it pretty much runs all night.

Now if I set it to ac on, via remote to 77 deg it will go down to 68 deg before the machine rests , cycles (only in dark period when it can , during lights on it stays a cool 76 )

 

[TribalSeeds]

I have a FEDDERS and ran into the same thing. It has a comfort setting which is supposed to keep the room at a constant 77deg, needless to say the calibration is off, it ha a 3 degree built in diffrential rate, that is more like 7 degree difference. She runs twenty four seven, high of 82 day, 71 at night. Dehuey runs any unwanted humidity out of the room 24/7 via drain tube to outside, it pretty much runs all night.

Now if I set it to ac on, via remote to 77 deg it will go down to 68 deg before the machine rests , cycles (only in dark period when it can , during lights on it stays a cool 76 )

Can you get away without running your dehuey with the lights on? Why not collect the waste water from the AC and dehuey?

Why not just use a temp controller? Day and night temps and the ac is just set on high. They controller turns the ac on when you need cooling, off at the desired temp.


Are there any hookups on the unit that allow you to use a home thermostat to control it?

Using a temp controller with a mini split is terrible. They start off at full power then cycle down and run at a lower wattage. Its not just inefficient it will also reduce the lifespan of your ac.

 

[Puscifer]

What TribalSeeds said!
A temp controller with an inverter mini split is not a good idea. It negates the benefit of the inverter for sure.
Your best bet is to try and get the wired controller that's made for it.
I believe a wired controller for a Panasonic mini split will work on the Sanyo's.
You'll have to do some internet searching and call around but I'm positive you can find one.
Good luck.

 

[jcom]

I have a controller but, like Tribal Seeds said, it is a bad idea. I use the controller for my CO2 and reflector fans. I am liking the Sanyo, but it is stupid that the included thermostat remote does not have the ability to do day/night settings. I spoke with my HVAC guy and he is looking into getting the wired thermostat everyone is talking about.

 

[HUGE]

Just pray it doesn't get cold outside where you live.

 

[jcom]

Just pray it doesn't get cold outside where you live.

It is a combo AC/Heater/Dehumidifier unit, so colder temps are not of concern.

 

[TribalSeeds]

What he means is that it wont operate in cold temps. It will hopefully shut itself down but it might turn into a block of ice. Some of these cheap AC's have no safety features and will just keep going until its all over

 

[jcom]

What he means is that it wont operate in cold temps. It will hopefully shut itself down but it might turn into a block of ice. Some of these cheap AC's have no safety features and will just keep going until its all over

Got it. I wouldn't say that these Sanyo's are/were cheap. My installer said that he's seen very good success with them. Guess I'll find out.

 

[HUGE]

Got it. I wouldn't say that these Sanyo's are/were cheap. My installer said that he's seen very good success with them. Guess I'll find out.

No they are not cheap. They are made well. They just seem to no do any of the things I needed it to do. Like be able to set a night temperature and be able to us it in the winter.

 

[mg75]

Just tonight... my 12,000BTU Ideal Air mini split shut down and most likely died. We had some cold nights in the north east and I suspect that is what killed it.

Are there any reliable mini-splits that can operate down to freezing levels?

 

[mg75]

perhaps we need to build an insulated "box" with a small heater in there so they wont fail at freezing/sub freezing temps.

 

[HUGE]

I finally replaces that piece of shit sanyo with a fijitsu 36clx1. It is low ambient has a programmable thermostat. Its quieter than a pocket watch. Absolutely lovebit.