Engine Preheat Switch

[Pete Masterson]

The AquaHot (and presumably the earlier systems) use heat exchangers to keep the AH (or furnace) hydronic heating fluid separate from the engine coolant -- and the domestic hot water. On the road, the engine warms the domestic hot water.

Pete Masterson

(former) '95 Blue Bird Wanderlodge WBDA 42

El Sobrante CA

"aeonix1@mac.com"

On Feb 18, 2010, at 1:20 PM, smquandt wrote:

Mike

The two systems are independent of each other, no connection. I don't really know the route for the plumbing at the engine, but it is the same path as the water heater system that heats the water from the engine heat. I'll send you a PDF, look at the last four they are for the hydronic heat.

In Marble Falls until 4/1 with a trip home to the cold to work for two weeks on Saturday.

Steve Quandt
1993 PT-40
Iron Mountain MI
now in Marble Falls, TX




--- In "WanderlodgeForum@yahoogroups.com", Michael Bulriss <mbulriss@...> wrote:

Thanks for the input Steve! So I guess what you are saying is that when you use the engine preheat the engine cooling system and the house hydronic heating system are hooked together and share common fluid when the engine preheat is used? Correct? Guess I should have flushed the house heating system when I flushed the engine and put in new diesel antifreeze. Never thought about that when I flushed the cooling system when we installed the new engine water pump this summer. Good thing I have not used the Primus, so the new antifreeze should not have mixed with the old green stuff in the hydronic system, correct?

How long are you in Marble Falls for?

Thanks,

Mike Bulriss

1991 WB40 "Texas Minivan"

San Antonio, TX

--- On Thu, 2/18/10, SteveQ wrote:

From: SteveQ

Subject: [WanderlodgeForum] Re: Engine Preheat Switch

To: "WanderlodgeForum@yahoogroups.com"

Date: Thursday, February 18, 2010, 9:28 AM

Â

Rick

I converted to a Webasto Scholastic unit so I only have one zone. The preheat pump will work regardless if there is heat or not.

Steve Quandt

1993 PT-40

Iron Mountain MI

now in Marble Falls, TX

--- In WanderlodgeForum@ yahoogroups. com, Rick Davis wrote:

Steve, your Primus has to be turned on for that upper dashÂÂswitch to circulate fluid to the engine, right? And if so, my coach as two boilers for two zones, so which zone needs to be activated for that engine preheat to work?

Rick Davis

1993 WBSA

Loudon, TN

(in New Orleans)

____________ _________ _________ __

From: SteveQ

To: WanderlodgeForum@ yahoogroups. com

Sent: Wed, February 17, 2010 7:01:05 PM

Subject: [WanderlodgeForum] Re: Engine Preheat Switch

ÂÂ

Mike

On to the left, off to the right on my 93. There is a pump, I think it is twelve volts that is behind my house battery trays. It circulates warm hot water / antifrezze mix to the engine and I think the hot water heater from you Primus or Webasto unit. I found mine this summer when I turned on the switch and heard it.

Enjoying the weather in the Texas Hill country, above zero and no snow to shovel

Steve Quandt

1993 PT-40

Iron Mountain MI

now in Marble Falls, TX

--- In WanderlodgeForum@ yahoogroups. com, "mbulriss" <mbulriss@ .> wrote:

OK, I have one of those how-to questions that is not answered in 'the book'. On my 91 on the far left topmost driver overhead dash panel, there is a black two position toggle switch labeled "Engine Preheat" - that's it, no "on" or "off" indication, no light. My question is: Is "on" when the switch is toggled in to the left side or the right side of the switch? What kind of electrical draw should I see on any of the gauges when it is on - *if* it is working?

Normally, we try to stay out of such climates where I would actually need said switch, until this past weekend in the Texas hills where it got well below freezing. ;^)

Thanks,

Mike Bulriss

1991 WB40 "Texas Minivan"

San Antonio, TX

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