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Old 09-20-2019, 10:42 PM   #81
TJLee089
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Default Re: Refrigerator upgrade question

Are you suggesting a compressor fridge does not need to have air exchange with the coach air?
That is the part I am doubting.

Quote:
Originally Posted by avanti View Post
You must never seal off the vents of a propane unit, since there are combustion products that have to be vented. It is just fine with a compressor fridge.
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Old 09-20-2019, 10:51 PM   #82
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Default Re: Refrigerator upgrade question

Quote:
Originally Posted by TJLee089 View Post
Are you suggesting a compressor fridge does not need to have air exchange with the coach air?
That is the part I am doubting.
Sorry, I misread your post. Yes, of course you need to vent somewhere. I though we were talking about sealing the OUTSIDE vents when upgrading from absorption to compressor. Sorry for the misinterpretation.
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Old 09-21-2019, 12:25 AM   #83
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Default Re: Refrigerator upgrade question

Quote:
Originally Posted by TJLee089 View Post
Are you suggesting a compressor fridge does not need to have air exchange with the coach air?
That is the part I am doubting.
Isotherm is very clear that without adequate ventilation behind the unit performance will be low and power usage will be high. I actually added a fan at the top of mine just to be sure.


Installation instructions

Quote:
4.1 Ventilation
It is very important that the compressor/condenser units
are well ventilated and that cold air can enter at the bottom, pass behind the fridge/freezer and warm air can leave at the top in the area where it is mounted. The natural flow of air from below and upwards behind the fridge can be increased by arranging ventilation openings at the rear.
Make sure there is a free area of 23 - 28 sq.in. below and behind the refrigerator/freezer to allow ventilation air to pass behind from below. See fig 5.
From the troubleshooting page:

Quote:
Fault
Compressor runs long time but not generating enough cold.

Possible cause
Bad ventilation. Condenser too warm. Fan not working.
To much frost on evaporator.
Door not closing well.
Condenser blocked by dust.

Action
Improve ventilation for compressor. Replace fan.
Defrost.
Check door position and door seal. Clean condenser.
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Old 09-21-2019, 12:34 AM   #84
woundedpig
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Default Re: Refrigerator upgrade question

Quote:
Originally Posted by old-geezer View Post
Isotherm is very clear that without adequate ventilation behind the unit performance will be low and power usage will be high. I actually added a fan at the top of mine just to be sure.


Installation instructions



From the troubleshooting page:
Did you include some extra insulation of the rear compartment in your install, not closing it off completely?
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Old 09-21-2019, 01:28 AM   #85
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Default Re: Refrigerator upgrade question

Quote:
Originally Posted by TJLee089 View Post
Makes perfect sense, but I'm still skeptical about sealing off the compressor/condenser space from the coach air as some (not you) have discussed.
I have never said that I sealed it off from the house/coach air.

I currently have a fan that is vented into the space around the MW pulling hot air from behind the fridge. When the fan is running you can feel the air coming out into the coach through the micro wave vents.

I am either going to drill a few small holes into the wall next to the entry on a Unity TB to vent into the space behind the fridge, or I am going to add two 3" duct vents similar to those on the dinette seat for the propane heater.

You will definitely need to make certain that the space behind the fridge is roughly the same temperature as the house ambient air.

I sealed the vents using HVAC tape as well as two layers of a stiff insulation board. I also added additional thinsulate against the outside wall.
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Old 09-21-2019, 11:08 AM   #86
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Default Re: Refrigerator upgrade question

I also insulated my outside exposed wall using several layers of Reflectix and with the sun shining on that wall and 100+ degree outside temperatures, the inside wall temp never exceeds 85 degrees. Old-geezer/Randy are right, you have to have good ventilation around the compressor Refrigerator, particularly in the back where the heat from the compressor running builds up. So the ambient temperature is even around the Refrigerator. I also added a fan that I can switch on to add more ventilation to the back space of the Refrigerator, if needed. So far I haven't needed it but I am still in the testing/getting used to the Refrigerator stage. I don't drive with my coach's AC running, fortunately my cab AC maintains a coach temperature of around 78 degrees so the Refrigerator operates no differently when driving. I believe if I can maintain the Refrigerators ambient environment temperature between 65-78 degrees I will get many years of worry free enjoyment from my new Isotherm Refrigerator, my only regret is not changing the Dometic and Hotpoint microwave out sooner!
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Old 09-21-2019, 11:39 AM   #87
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Default Re: Refrigerator upgrade question

Quote:
Originally Posted by RandyJohnson View Post
SSTraveler.

We have 710 pvs on the roof, 3000 watt inverter, and 400 aHrs lithium. Assuming full batteries we can run the AC for roughly 3 hours before the batteries are drained

Does work well if you have pets.

It also helps maintain the fridge using conditioned air.

With the alternator the batteries are fully charged even while running the AC and driving.


Sent from my iPhone using Tapatalk Pro
That's exactly what I am talking about! If I get a new Unity I am going all in on this upgrade right away. One thing I learned is that you should start making the changes you want right away even on a brand new coach.
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Old 09-21-2019, 11:59 AM   #88
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Default Re: Refrigerator upgrade question

Quote:
Originally Posted by RandyJohnson View Post
I am either going to drill a few small holes into the wall next to the entry on a Unity TB to vent into the space behind the fridge, or I am going to add two 3" duct vents similar to those on the dinette seat for the propane heater.

You will definitely need to make certain that the space behind the fridge is roughly the same temperature as the house ambient temperature.
I like your idea of drilling holes. If you use three different sizes of bits, holes could look decorative, as if they have always been there. You could also put decals with circle patterns on the wall and drill holes in some of the circles for a decorative effect on vent holes.
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Old 09-21-2019, 02:13 PM   #89
TampaSteve
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Default Re: Refrigerator upgrade question

Quote:
Originally Posted by SSTraveler View Post
That's exactly what I am talking about! If I get a new Unity I am going all in on this upgrade right away. One thing I learned is that you should start making the changes you want right away even on a brand new coach.
That's how I feel. I started tearing out things and drilling holes through the roof on my coach almost immediately upon delivery. My wife thinks I bought just for upgrading, not for travel, which is only slightly untrue.

Most of my upgrades were based on experience though. It wouldn't have occured to me to upgrade my fridge until I found out how bad the factory one was. Never having RV'd before that was a surprise.

Same thing with every project. Very first one was to install a bidet seat, after we discovered single ply tissue dissolves in your hands at the worst possible time. :-)

I'm on the fence about replacing the generator with a bank of Lithium batteries though. I'm too lazy to do the math, but if you add up the potential energy of a full tank of propane running the generator its massive, more than any battery bank in the same space would hold. I like having all that for "backup" the way I camp (which is random and irregular, and often with no hookups, and we move a lot).

No doubt as the technology improves through my thoughts on that may change.
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Old 09-21-2019, 02:20 PM   #90
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Default Re: Refrigerator upgrade question

Quote:
Originally Posted by SSTraveler View Post
That's exactly what I am talking about! If I get a new Unity I am going all in on this upgrade right away. One thing I learned is that you should start making the changes you want right away even on a brand new coach.
We took the unit out to AMSOLAR for the electrical upgrade within 30 days of receiving the coach.

Once you start making the modifications to suit your needs don't plan on trading it anytime soon.
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