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06-03-2023, 10:28 PM
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#1
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Senior Member
Join Date: Aug 2017
Location: Burien, Wa
Posts: 1,167
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Country Coach specific question engine preheat
Hi for those of us that have hydronic heating systems that can perform engine preheat functions.
The fluid being heated must be engine coolant yes? That his heated in our hydronic systems?
And the reverse is true when traveling and no hydronic system on but engine preheat pump is circulating we can run our furnaces when traveling in cold weather?
So the fluid in the heat exchangers for the furnace must be engine coolant? Correct?
Thanks
Greg
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Greg and Vicki R.
2004 Country Coach Intrigue "Sweet Serenade"
40' Tag Axle Quad slide CCI #11811
16 Jeep Wrangler, Airforce One
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06-04-2023, 04:36 AM
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#2
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Senior Member
Monaco Owners Club
Join Date: Nov 2015
Posts: 2,210
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The engine coolant and boiler fluid are separate. The engine coolant is circulated through the furnace on a loop that is separate from the units hydronic fluid.
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Steven & Laurie
2006 Moncaco Executive Ranier
Detrioit Series 60 (515HP), Allison 4000 series
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06-04-2023, 04:58 AM
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#3
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Senior Member
Monaco Owners Club Forest River Owners Club
Join Date: Jul 2012
Posts: 3,281
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The engine coolant is separate. The preheat pump is only used with the engine off to circulate coolant in the engine through the boiler. This heats the engine assuming the boiler is on. If the engine is running its own coolant pump circulates engine coolant to the boiler by itself and ends up heating the boiler , no need for the boiler to be on while traveling. ( preheat pump should be off as it’s not needed)
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2023 Coachmen Encore 325SS
2002 Ford Escape toad
2020 GMC terrain
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06-04-2023, 05:00 AM
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#4
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Senior Member
Country Coach Owners Club
Join Date: Sep 2011
Location: Mills River, NC
Posts: 229
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Since the fluid is different than the engine coolant and it is in close proximity to the potable water (inside the hydronic heater), we use a non-toxic coolant. If there were ever a leak in the heat exchanger, coolant would be combined with the potable water.
This was told to us by the previous owner...
I'll attach a picture.
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John
2003 CC Allure 36’ First Ave. #30914
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06-04-2023, 07:23 AM
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#5
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Senior Member
Join Date: Aug 2017
Location: Burien, Wa
Posts: 1,167
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Quote:
Originally Posted by BillJinOR
The engine coolant is separate. The preheat pump is only used with the engine off to circulate coolant in the engine through the boiler. This heats the engine assuming the boiler is on. If the engine is running its own coolant pump circulates engine coolant to the boiler by itself and ends up heating the boiler , no need for the boiler to be on while traveling. ( preheat pump should be off as it’s not needed)
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Thanks Bill
Makes sense about not needing engine preheat on during travel..water pump on engine does that chore
And as it's engine coolant the only boiler fluid is in the hydrohot boiler tank...thus the use of GRAS boiler fluid
Greg
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Greg and Vicki R.
2004 Country Coach Intrigue "Sweet Serenade"
40' Tag Axle Quad slide CCI #11811
16 Jeep Wrangler, Airforce One
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06-05-2023, 04:22 PM
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#6
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Senior Member
Join Date: Nov 2013
Location: Burien ,WA
Posts: 991
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The boiler hold a few gallons and is basicly a water tank heated by the diesel or electric elements. There are two heating coils running thru the boiler tank. One running clean tap water and one running engine coolant. The boiler tank can either heat the engine coolant or the engine coolant can heat the boiler tank. It just depends on which one is hot or cold.
The boiler tank is filled with boiler antifreez and the water is sent to the individual radiators or ex-changers .
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06-05-2023, 04:50 PM
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#7
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Senior Member
Join Date: Aug 2017
Location: Burien, Wa
Posts: 1,167
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IASM
Our Hydrohot only uses one element and it's not large..and also needs to be replaced  that's why nI need to drain and since I don't know the age of boiler fluid going to do a swap out
Also as you said boiler heats engine coolant..that was all swapped out 3 years ago that fluid also supplies hot fluid to heat exchangers for the furnace
The other coil is just for hot water
Oh and howdy neighbor!
Greg
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Greg and Vicki R.
2004 Country Coach Intrigue "Sweet Serenade"
40' Tag Axle Quad slide CCI #11811
16 Jeep Wrangler, Airforce One
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08-24-2023, 09:01 AM
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#8
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Member
Country Coach Owners Club Damon Owners Club
Join Date: Dec 2018
Location: Puyallup WA
Posts: 40
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Quote:
Originally Posted by gnvrvin
Hi for those of us that have hydronic heating systems that can perform engine preheat functions.
The fluid being heated must be engine coolant yes? That his heated in our hydronic systems?
And the reverse is true when traveling and no hydronic system on but engine preheat pump is circulating we can run our furnaces when traveling in cold weather?
So the fluid in the heat exchangers for the furnace must be engine coolant? Correct?
Thanks
Greg
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on my 2006 Affinity I also have another pump that is in the cooling system it is a MP29224 Straight port pump. It is located under the coach by the rare axle. This pump developed a leak that came from the weep hole and leaked Engine coolant.
Apparently it circulates the coolant to parts unknown in the front of the coach. Can someone explain to me what the purpose of that pump is? And what controls it?
Thanks
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08-24-2023, 09:18 AM
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#9
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Senior Member
Join Date: Aug 2017
Location: Burien, Wa
Posts: 1,167
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OK I have come.to find out that it is indeed boiler fluid that is used in for heat exchangers to heat interior of coach...just recently drained and flushed loop 1 and loop.2
Engine coolant runs through a seperate coil to heat boiler fluid during travel and boiler does not to be on. When it's cold.fire boiler off and turn on engine preheat to circulate the heated engine coolant to warm engine
If the engine coolant coil leaks it will not make its way into the potable water but will Leake into your boiler tank...causing overflow
Potable water runs through a seperate coil to be heated. Most water supplie are higher than the max pressure of 13 PsI that allowed in our hydrohot...hence 13PSI pressure cap. So highly unlikely of cross contamination
Rebuilt unit on the way hope tone ready to drop it in place day of arrival
Greg
__________________
Greg and Vicki R.
2004 Country Coach Intrigue "Sweet Serenade"
40' Tag Axle Quad slide CCI #11811
16 Jeep Wrangler, Airforce One
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08-24-2023, 09:34 AM
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#10
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Senior Member
Join Date: Jul 2017
Location: Box Elder, SD
Posts: 1,049
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Quote:
Originally Posted by dogpaddle
on my 2006 Affinity I also have another pump that is in the cooling system it is a MP29224 Straight port pump. It is located under the coach by the rare axle. This pump developed a leak that came from the weep hole and leaked Engine coolant.
Apparently it circulates the coolant to parts unknown in the front of the coach. Can someone explain to me what the purpose of that pump is? And what controls it?
Thanks
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No direct knowledge but I believe that pump is for the front heater core to augment flow. I've also read that some just remove the pump and patch the hose back together.
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2009 Country Coach Veranda 400, ISM 500, Aqua Hot 525D
2019 Lincoln Nautilus 2.7L Toad
2020 Lectric XP E-bike (Hybrid)
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08-24-2023, 11:14 PM
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#11
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Senior Member
Join Date: Aug 2017
Location: Burien, Wa
Posts: 1,167
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Quote:
Originally Posted by BonS
No direct knowledge but I believe that pump is for the front heater core to augment flow. I've also read that some just remove the pump and patch the hose back together.
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Bingo...heard the same as they are prone to catastrophic failure expelling engine coolant fluid
Do a search there have been a few posts ont it
Good Call BonS
Greg
__________________
Greg and Vicki R.
2004 Country Coach Intrigue "Sweet Serenade"
40' Tag Axle Quad slide CCI #11811
16 Jeep Wrangler, Airforce One
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