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  #1  
Old 02-03-2016
Bob Johannesen Bob Johannesen is offline
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Join Date: Apr 2009
Location: Argyle, Texas
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Default Primus Electric heaters replaced

Hydronic Immersion heater install:

My Primus electric heaters had long since "expired" and I decided to replace them with a small tank-less hot water heater. While I don’t believe that the electric hydronic heat is the most efficient source, I did want them to work for those winter nights in a campground with 50 Amp power available.

I removed the old heaters (BlueBird called them “Emersion heaters” probably because they immerse the elements in the water…?). Here are the old heaters and the new empty space for the tankless heater:







I did some research and found this the Marey Power Pack (Model #94-805-006) by Santon. It is a small compact unit with 2 temperature control sensors:







It required a 220 VAC Breaker so I removed the old Primus breakers and moved the other breakers up the panel to allow space at the bottom of the breaker panel. I also had to engrave a new set of labels for the breakers:



I ran the wiring down through conduit to the Primus 4” X 4” FS box which used to have the two 120 VAC circuits. The 220 VAC circuit required that I use a contactor to make the connection. The contactor was just barely able to be installed in a 4” X 4” FS box if I machined off half the threaded bosses inside the box:





Then I still had to use two 1 inch extension rings to enclose the contactor:



It is a tight fit and I installed a 120 VAC LED indicator on each leg so I could tell if the thermostat called for heat:



On the front panel, the contactor will close by either the “Electric Low or High” selector switch if the thermostat relay sends power:





I plan to test run the system all day tomorrow while I wash the Bird and Jeep.....if it gets above 60 degrees!

.
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Bob & Judy Johannesen
1991 WLWB "Seldom Blue"
1978 FC "Smell The Roses Now" SOLD...Costa Rica
Argyle, Texas
940-300-5257

FMCA #72567, WL #1986, Vintage Birds # 345,
IBA #11205
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  #2  
Old 02-03-2016
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Randy Dupree Randy Dupree is offline
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hmmm,did i see a genny preheat switch?
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2000 LXI 43
Bainbridge,Ga.
Archer Fl.
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  #3  
Old 02-03-2016
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Randy Dupree Randy Dupree is offline
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Bob,thats a very nice installation,well done!
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2000 LXI 43
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Archer Fl.
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  #4  
Old 02-04-2016
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Bill Pape Bill Pape is offline
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Good job, thanks for the write-up & pictures
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  #5  
Old 02-04-2016
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jimbonich jimbonich is offline
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Very nicely done! I needed this last winter and then I discovered that if you drive south the weather gets warmer......
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'93 PT40WB
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Saint Petersburg, FL
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  #6  
Old 02-04-2016
bubblerboy64 bubblerboy64 is offline
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Some of you guys are amazing. Bob I really don't understand what you did here but I am very impressed with the neatness of the job. Real talent understanding and I AM JUST PLAIN JEALOUS.

Jim I'm sort of with you. For every problem there is an answer. At least you have the sense to move. I'm still here but I do plan to head south in two weeks.

Bob what did you use to make your plastic labels for the breaker box?
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  #7  
Old 02-04-2016
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Mallie Lennon Mallie Lennon is offline
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Bob, you do some fantastic work. Looks good.
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  #8  
Old 02-04-2016
LarryKehler LarryKehler is online now
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I need this modification bad but it looks like a huge project. I hope to see your coach at a rally soon.

Very well done. Thanks for the write up.
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  #9  
Old 02-04-2016
Bob Johannesen Bob Johannesen is offline
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Quote:
Originally Posted by Randy Dupree View Post
hmmm,did i see a genny preheat switch?
Yes Sir, I used to go to the in-laws in IOWA (Brrrrrrrr) so I needed one!




I am afflicted with that Blue Bird syndrome of "If it doesn't work - it needs to be fixed or upgraded"! Bigger and more power is always a good thing!
.
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Bob & Judy Johannesen
1991 WLWB "Seldom Blue"
1978 FC "Smell The Roses Now" SOLD...Costa Rica
Argyle, Texas
940-300-5257

FMCA #72567, WL #1986, Vintage Birds # 345,
IBA #11205
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  #10  
Old 02-04-2016
Bob Johannesen Bob Johannesen is offline
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Join Date: Apr 2009
Location: Argyle, Texas
Posts: 1,089
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Quote:
Originally Posted by bubblerboy64 View Post
Some of you guys are amazing. Bob I really don't understand what you did here but I am very impressed with the neatness of the job. Real talent understanding and I AM JUST PLAIN JEALOUS.

Jim I'm sort of with you. For every problem there is an answer. At least you have the sense to move. I'm still here but I do plan to head south in two weeks.

Bob what did you use to make your plastic labels for the breaker box?
Thank you Sir. I have a New Hermes engraving machine for the light stuff and a Gorton P-1 Pantograph mill for the heavy things.
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Bob & Judy Johannesen
1991 WLWB "Seldom Blue"
1978 FC "Smell The Roses Now" SOLD...Costa Rica
Argyle, Texas
940-300-5257

FMCA #72567, WL #1986, Vintage Birds # 345,
IBA #11205
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