That is interesting . If it was blowing cold air in heat mode , sounds like defrost cycle ? Did it have any resistance heat strips ?

My understanding is the standard operating procedure with " big " central HP units , is to bring on the resistance heat during a heat cycle , to prevent the system from blowing cold air ?

The MS's seem to not run the inside fan when in heat cycle ?

I am a newbie with the ownership and operation of HP's , although we have hooked up some . When I calculate load on one , I always ask , first , how many KW of resistance heat is present . Then add in the refrigeration load .

Often , when the A/C contractor is retro fitting an existing gas fired system with a HP , the existing electrical has to be upgraded to accomidate the additional load of the resistance heat strip .

Congrats on the successful start up of the MS ! :-)

God bless
Wyr

The way I heard it, was the systems worked like many old-tech central air units.
The air might be warm to start with, but by the time it got to a room vent,
it had lost much of it's heat to tin duct-work. You stand in front of the vent
for 5 or 10 minutes, and the warm air starts coming out! :p
Then after a while, it starts coming pretty hot..

In the case of a Heat Pump, the starting temperature isn't nearly as high as a gas-fired rig.
So, it's going to take much longer to over-come the coolness of the tin duct-work.
Back in the day, a lot of those ducts weren't insulated and some were in attics
or unheated basement areas.
Even with a gas-fired system, that first burst of cold air is present.

The indoor unit of a Duct-Less MS, has a temperature sensor on it.
Once that sensor detects a warm HX, the controller can turn on the fan.
Presto, almost instant heat. Without the blast of cold air..

I wonder if the older ASHPs had good controllers and sensors?
Or, was their main sensor the house thermostat?

~~~~

The defrost mode on the Sanyos pushes in some cold air..
But, it's smart about it. The fan is turning super-slow.
You have to put your hand right under the vent, to feel the cold air.
Scan the vent, and it's Cold! (Around 30F IIRC).
But, since the fan isn't blowing air off that cold HX, it's not much of a problem.
Depending on the amount of ice on the outdoor HX, the melting cycle can be fairly short.
It's never been long enough for the house to really cool off..

BUT, I never sit in the red chair, when defrost is running.. :eek:


http://i46.photobucket.com/albums/f1.../NCL/Sanyo.jpg

Congrats on the install. Nice job.

Thanks.

We had the thermostat in our MB for the central heat/AC last night I moved it out to the living room.
It got into the high 30’s and MS did great we were nice and warm and the power usage was very little.
I have a TED 5000 but I only have two sets of clamps to measure solar power and home usage. It would be nice you get another set of current clamps to measure MS power usage.

We really like the new MS. I just ordered a LG dual zone for the living room, kitchen/ breakfast nook.
LG 21,000 BTU 21 SEER Ductless Dual Zone Heat Pump System 9,000+12,000
https://www.acwholesalers.com/LG/LMU...8:21.00:5206:9 + 12

The 9,000 btu unit will go in the kitchen/ breakfast nook and the 12,000 btu unit will go in the living room.
The other units I was looking at were under sized for the area I wanted to heat/cool. This unit is not as high seer as the one I was looking at but it should do a better job.

http://ecorenovator.org/forum/attach...install-lg-jpg

I am back from vacation and my new LG dual MS comes tomorrow. I am excited to get it up and running

We have been running our MS on HP mode , the last few days . So far I am pleased . But I am waiting on the first electric bill since HP season started .

Out door temps have been 40 degrees on up . More up than at 40 .

God bless
Wyr

Best of luck on the install . Please keep us informed .

I have seen a few dual installs on YouTube , but that is all I know . My install is / was a single .

How does the price of a dual unit compare to 2 single units ? Energy consumption ?

God bless
Wyr

Here are AHRI Certification Directory numbers. (I attached a photo with them)
I got a decent coupon code and I got the system for $2324.22 shipped.

LG 18,000 BTU Ductless Multizone Heat Pump Condenser 21 SEER Model#: LMU187HV

LG 9,000 BTU Flex Multi Wall Mounted Heat Pump Air Handler LG 9,000 BTU Flex Multi Wall
Mounted Heat Pump Air Handler

That included shipping and 2 insulated 25’ line sets a sleeve to go through the wall and line set vinyl covers and drain hose.

Two single units I was looking at would have cost more and use more power. The warranty is shorter for duel units.

2 year parts 5 year compressor.
Single unit is 5 years parts and 7 years compressor.


I will see how these all work out and how much power they use. If down the road we are pleased with them we may put in a trizone in the other bedrooms then I would have the house pretty well covered.
But I am getting ahead of myself I need to get these installed first.

http://ecorenovator.org/forum/attach...-lgnumbers-jpg

multiple mini-splits
 

Be careful you don't add too much heating or cooling for your home! With these three zones, you will have over 2 tons of heating and cooling (at high efficiency) at your disposal. This may not sound like a whole lot, but it is enough to heat and cool a decent sized house if done correctly.

The idea here is to make these high-efficiency units work like dogs to save you energy and money. If you can satisfy 80-90% of your heating and cooling needs with only 2 tons of mini-splits (maybe less on average with inverter units), they will level your utility bill.

Let your old central system turn on for that crispy, windy week in January. That way, the furnace won't rust to death. And the central air conditioner can do its part on the 4th of July, when it's 105 degrees and 105 percent humidity for a week. When you have a party, just set the whole house thermostat to whatever for the day (or just turn on the blower to level out the temperature of the whole home for next to nothing) to keep all the guests comfortable.