Bill R

Bob - you have the correct understanding. The ECM will cause the fan to go wide open as the temperature increases. The responsiveness of the ECM however I am not sure of. The Thermal Switch to me is just an operational preference that when coolant gets to 205F the fan will go wide open and keep the temp from climbing any higher. Let us know what you end up doing. Mark - let us know if this fixed the problem. You may have 12V to the valve, but the question will be does that voltage drop as the engine warms up showing that the control board is working. I hope it does work. That is a good find. I was concerned that my issue but have been the connector as well, but I confirmed by bypassing the connector that it was not.

Eric - can you expound a little more about "Neither unit comes with a control board"? The specs for the Blizzard NXT say that the unit has a built in control board that works only with the CCC-2. Are you referring to the conversion board needed to work with the older 5 button T-Stat.

Mark - my coach came with a water temp sensor that was not being used because it was faulty. It is a redundant sensor so I just decided to use that port for the thermal switch. I have attached a pic that shows the old temp sensor located on top just above the exhaust manifold. Here is a link of the motor controller I have been using. I don't exactly recall the voltage to set for cold startup but I do think it is around 8.5V to 9V coming out of the MC to the pintle valve controller. You can buy a laser tachometer and measure your fan speed to be more precise. The initial voltage is really only important on cold starts to make sure you have some cooling to use dash A/C. Once the engine starts to warm up the ECM will start to take over and adjust the speed of the fan through the MC. I ran the wires in a wire loom to the rear run bay where I mounted the MC. I have been running this setup for 2 years now and have been very pleased with the operation. Hope this helps. https://www.amazon.com/RioRand-7-80V-Motor-Controller-Switch/dp/B071NQ5G71/ref=sr_1_3?crid=1L2746B6QQUBA&dib=eyJ2IjoiMSJ9.j-9fMQg81vrq0DfsMJ5hlpgzSfYN6qoIz7uwHuBkQSwFBTGwVF94FIm2ne7X6ZlPXune95rL0scAdkpxSSx6DT1Vxkxl3EHzGNotxUGGuTXGq4fdRavfEJgLD_zFrYDvEneAfh58kiaY4Utb88gXEZurdMOtuCbk3kmUemO5zicY-nQg_sZ6pfM5A2mKkR6wbv9dZnicpG_ueL29Zefu-eASAZHdojcjj9Fjn7Xmfc3oKUmHBiTNo3QKmyTFrCUoIhUc3xPrG9_qn6uIxIFCbpLOiPESxR6_YKFQjUD3MXY.0ZFtGYR1phXlcOMiJJU8sl896vhY8M3FhNhAvgmaU2A&dib_tag=se&keywords=riorand+7-70v+pwm+dc+motor+speed+controller+switch+30a&qid=1712026087&s=hi&sprefix=Riorand+7-7%2Ctools%2C185&sr=1-3

Duey - I sent you a PM

Duey - What are your current units you are replacing?

Ben - 15K Heat pump. Yes I couldn't believe it. Included shipping to my house. I have a very old DuoTherm that I figure I might as well just go ahead and replace at that price. Walmart still has this price for the Black cover. The sale I got was for the white cover which always seems to be more expensive. I guess supply vs demand. https://www.walmart.com/ip/Dometic-Blizzard-NXT-Air-Conditioner-Heat-Pump-Mid-Profile-Rooftop-Multi-Zone-AC-CCC-II-control-board-15k-BTU-Black-Unit-RVs-Trailers/294591839?from=/search

Snowflakes!

I purchased the Blizzard NXT last fall for the same reason, higher CFM. They are only a couple inches taller, but it allows for larger condensing and evaporator coils, which in turn allows for higher CFM. Plus Wal-Mart had them on sale for $1,000. I haven't installed it yet, planning to do so this Spring. If I recall, my research showed that you do not need to make any modifications when replacing a Penguin II. If you get the NXT I'll be interested to find out how it goes.

I installed a pressure gauge on my ping tank so I could monitor the compressor, switch, and tank operation. Knowing the pressure of the tank will help you trouble shoot the issue. As mentioned above, it is important to drain this tank at least monthly, or more often if it is coming on frequently.

Thanks for the update Jim. Changing the belt on my 8KW is on my to do list. Fortunately I have a slide out too and based on your experience I am counting on it not be too laborious. With regards to the spark arrestor, I remove it every oil change. Easy to do and as you found out it can collect a lot of soot. Also, important to turn on generator to blow out any excess before reinstalling.

I sample every two years. Not only does this give you the current condition of the coolant, but a trend over time to determine when it is getting close to do a coolant change. JG Lubricants or Blackstone Labs are commonly used.

Mike - they still look really good, shine up the rubber and they'll look even better.

@olywrestle sent you a PM regarding your comments.

I realize I should have provided a little more detail. This is the DuoTherm Penguin II 13,500 BTU Heat Pump model 651815. I know I can buy this control board online but was hoping someone had recently changed theirs out and just had the old unit to discard. Anyway, giving it a try. Part number I was given by Dometic was 3312022.000.

This Spring I will be changing out the old REAR DuoTherm A/C with a new Penguin II. My FRONT A/C unit was installed by PO and is a Penguin II, but it has the control board conversion so it can work in conjunction with the REAR DuoTherm and 5 button Thermostat. After I install the new Penguin II, I will be upgrading to the MicroAir Thermostat that works with the Penguin II units. I will need to replace the FRONT A/C conversion board. So I am in search of anyone who might have a spare Penguin II control board they do not need or are willing to sell?

I am following. I have wondered the same thing why there are no rain gutters on our coach. Our fifth wheel had them. Has anyone installed these rain gutters? Or if not, why not?

Yes I did when I put it back on. It didn’t change the slight pull. You should try still. You never know.

Rick - My coach came from the PO with a steer safe as well. I also had the opposite of you, a slight pull to the left. So I decided to remove the steer safe. No change. Those devices are designed to keep your wheels straight in case of a steer tire blow out. I have read several testimonies that they are effective in doing that, so I put them back on. My next thing to do is swap the front steer tires. I have read that this has solved a lot of slight pulls to the left or right. Best of luck.

Harry, my cooling stack is very similar to yours. Did you spray in the expandable foam in the voids on both sides? Makes sense to keep air from bypassing the stack.

I have both hard and electronic copies of my manual. The hard copy does allow to add notes and I can flip between sections and pages easier. However, since I learned about the search function of the pdf file, CTRL F, I have found that the electronic copy makes it really easy to find a specific topic(s)/word(s) that I may not remember what page it is on and it is not in the index. For example, if I searched on "tire pressure" I can quickly read through every section the manual has to say about "tire pressure."

@Dennis N - 2005 Windsor Dennis - as a follow up to your question about generator extended operation between oil changes. The oil sample of my recent oil change after running for 270 hours showed good results. JG Lubricants said that I could have kept running with the oil. So next time for me it will be 300 hours and sample. Figured you might want to know this since our generator operation scenario is very similar.

@96 EVO Ben - I won't be able to attend the seminar, but I have been told that the Fleetguard ES Compleat EG is a "Hybrid" coolant that contains both SCA and OAT additives. If they mention this can you report back what you hear? Thanks,

@Joe Lee Pull the switch out and see if there is an alphanumeric part number stamped on it. Then google that. I have found most of my switches at https://www.carlingtech.com/products

Recently installed two of these with C Port at the end of cabinets. Had to install two boxes as the RV OEM ones had no box. Very pleased with them too. https://www.amazon.com/gp/product/B09GLSJP1W/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1

Check out this video.