#2 Sanyo 24KHS72 AC/HP Install Project (Oct 2011)

[Xringer]

"The U-Crown heatpump is specifically designed for Canadian weather with its 2-Stage compressor. It will keep you warm during those harsh winters with a capacity to run at full efficiency up to -30ºC outdoor temperature."

So, -22 F seems very close to the US Crown series at -20 F..
Maybe I need to find some reviews who live in the US snow belt..

~~
Edit:

Tested the Reactor this afternoon. That dead-short on the VOM was bugging me.
It has pretty good Reactance. Not shorted..
It reacted much like the big 60hz transformer I tested the rig on, before dragging the function generator out there..
Not as high as the transformer, but close enough to say it's good.

[pinballlooking]

Originally Posted by Xringer

"The U-Crown heatpump is specifically designed for Canadian weather with its 2-Stage compressor. It will keep you warm during those harsh winters with a capacity to run at full efficiency up to -30ºC outdoor temperature."

So, -22 F seems very close to the US Crown series at -20 F..
Maybe I need to find some reviews who live in the US snow belt..

I looked around some for some reviews but I did not really find any. Hopefully you will have better luck.

[ctgottapee]

At this time, the Fujitsu it best for legit cold weather, it doesn't cut out until -25F and I've had mine running at local reported temps that were -29F.
The Mits has a hard cutoff at -20F; the Fuj is a soft cutout where it doesn't cycle off and you have to wait for a recycle. At around -25F and lower my unit basically was in a constant defrost mode, the Mits shutsdown and waits to warm up.

On my third year of the prior model of Fuji, and it handles the extremes like a champ except it needs a pan heater. The new H models have smart pan heaters that don't lower the HSPF ratings, unlike all prior models.

I read a good article on how the two models (the main selling low heat minisplits for each) have different operating parameters that would work better or worse for some - the Mits had a wider operating range offering more potential for savings in light use, but less with heavy use, but I can't remember where it was.

[jeff5may]

Here's the troubleshooting problem I finished up this week:


It lives (and does at least 86 mph)! Plymouth chassis, Chevy drivetrain, Ford front end, Cadillac steering wheel. Recycled everything.

We have to dig the next one out of the garage...
I hope I am as spry as Kenny is when I turn 80 something. I'm sure he works more now that he is retired than he did in the army.

[WyrTwister]

Xinger ,

Which units did you end up ordering ?

If you are interested , Johnstone has Friedrich 25 & 21.5 SEER MS's on sale .

God bless
Wyr

[WyrTwister]

Saw this add , this morning .

http://www.amazon.com/dp/B018HBGJOO/...16a873b87085_S

God bless
Wyr

[Xringer]

I'm trying to find out about the Gree U-Crown line. It came out about a year ago,
but it doesn't seem like it's being sold in the USA yet.. Just in Canada and elsewhere.

https://www.master.ca/en/groups/wall...h18uc-u-crown-

When I purchased my Sanyo unit, I didn't know if I was buying old-tech hardware.
I would like to avoid that if possible.

[WyrTwister]

http://www.greecomfort.com/our-products/crown/

GREE Crown Series 9,000 BTU Single-Zone Ductless Split

U-Crown Inverter Wall Mounted Series ACR-NEWS Product information

GREE Crown Series 9,000 BTU Single-Zone Ductless Split


http://r.search.yahoo.com/_ylt=A0LEV...T7SDMlBJGkUT4-


Maybe this will help ?

I have read of people in Canada ordering equipment in the USA and having it delivered to Canada . or driving across the border and picking it us .

Do not know about the reverse ?

God bless
Wyr

[WyrTwister]

Originally Posted by Xringer

"The U-Crown heatpump is specifically designed for Canadian weather with its 2-Stage compressor. It will keep you warm during those harsh winters with a capacity to run at full efficiency up to -30ºC outdoor temperature."

So, -22 F seems very close to the US Crown series at -20 F..
Maybe I need to find some reviews who live in the US snow belt..

~~
Edit:

Tested the Reactor this afternoon. That dead-short on the VOM was bugging me.
It has pretty good Reactance. Not shorted..
It reacted much like the big 60hz transformer I tested the rig on, before dragging the function generator out there..
Not as high as the transformer, but close enough to say it's good.

With a conventional VOM , I would expect the reactor to show low ohms resistance . Is that what you found .

Adds inductance when you apply AC ?

I studied that in Physics class and a little in apprentice school . Never had much application for it .

Have dealt , a small amount , with capacitors for power factor correction .

Best of luck . :-)

God bless
Wyr

[jeff5may]

The common name for this power factor correction circuit is a Boost Converter. In most applications, it is used as a DC to DC step-up converter, to get a high-voltage DC source to use inside a device powered by low voltage DC (laptop LCD backlight, solar powered calculator, electric fence controller, etc.) without using up much space.

See here for theory of operation. Most boost converters run at high frequency, making them more difficult to troubleshoot. This circuit, however, is synchronized with the power line, so it is easy to tell if everything is working as it should.

In the mini-split, it may or may not be being used to step up the power source. The main purpose of the circuit is to absorb all of the noise created by the drives for the compressor and fan motor, and to draw power from the AC line as efficiently as possible.The big electromagnet (reactor) acts as a shock absorber between the mains AC rectifier and the DC power supply circuit. The transistor is controlled so that it switches on when the AC line is close to its peak voltages (both positive and negative). This shorts out the reactor coil and builds a magnetic field in its core.

When the AC line passes its peak voltage values, the transistor switches off. The magnetic field in the coil collapses (due to the reduced current draw) and the inductor passes this magnetic energy (as counter-emf or back-emf) through the rectifier diode to the capacitor bank. When the energy stored in the capacitor bank is drawn off (by mainly the variable-speed compressor), the rectifier diode isolates all of the current spikes and high-frequency noise from the mains line, making the unit appear as a mainly resistive load to the power meter at the service entrance. Any small amount of noise that is passed while the diode is conducting is absorbed by the reactor before it makes its way to the power line.

Bottom line: apparent power (VA) becomes much closer to true power (W) and the unit costs less to run.

Hope this helps.