Coolant flow to heat exchanger fitted to a 1hz

Submitted: Sunday, May 11, 2008 at 17:13
ThreadID: 57497 Views:2203 Replies:5 FollowUps:6
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Howdy all, I have a 75 series troopy 1hz with a heat exchanger hot shower fitted. I have had the vehicle for 4 years now, and used the shower for the first time today. It didn't get all that hot, so I have been reading up, trying to work out if it is installed correctly. Hopefully someone here can confirm.

The coolant flows through the heat exchanger in the right direction (ie. opposite direction to water flow), however the coolant flows through the heater valve to the interior heater first, and then it is the return hose from the heater unit that flows through the heat exchanger. Is that right?

I thought maybe it would be more efficient (for water heating) to have the coolant flow directly to the exchanger, and then the outlet from the exchanger flow to the heater valve, then to the heater unit, and the return hose back into engine.

Anyone able to advise?
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Reply By: Member - David P (VIC) - Sunday, May 11, 2008 at 17:18

Sunday, May 11, 2008 at 17:18
Do you have to have the engine running and the heater selected on with fan off if its hooked up after the heater??....silverback
AnswerID: 303256

Reply By: Wayne (NSW) - Sunday, May 11, 2008 at 17:28

Sunday, May 11, 2008 at 17:28
Tim,

Just had a look at my set up.

Water comes out of the block, through the heat exchange, through the heater valve, into the vehicle, through the heater in the cabin and then returns to the block.

Now because you have a Troopie you will have a hand throttle. Wind the revs up to 1200rpm, turn the fan off and set the heater setting on the dash to max hot.

When the water starts to go through shower rose, stand back, it will be very hot. After a few seconds it will be cool enough to have a shower. If the shower is still too cold up the revs to 1400/1500 or slow the water going through the shower rose.

The only time I have had to up the revs to 1500 is in the Vic High Country when the water from the river was just above freezing

Wayne
AnswerID: 303257

Follow Up By: Tim Owen - Sunday, May 11, 2008 at 17:35

Sunday, May 11, 2008 at 17:35
Thanks Wayne. Yours flows HE first, interior heater second. Mine is the other way round. Not sure what difference this makes.

I had the heat on full and fan off. I did wind the hand throttle up a bit (didn't take any notice of rev count), but perhaps I need to go a bit higher?

Anyone know how much difference changer the order around will make?
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FollowupID: 569389

Follow Up By: Wayne (NSW) - Sunday, May 11, 2008 at 17:44

Sunday, May 11, 2008 at 17:44
Tim,

With the fan off, the difference would be minimal. If the fan was on heat would be lost as the fan pushes cool air through the heater.

I have found that the revs do make a big difference to the shower temperature.

I have also mounted the heat exchange vertically behind the passenger side head light so it is a long way from the heater.

Wayne
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FollowupID: 569392

Follow Up By: Member - Vince B (NSW) - Sunday, May 11, 2008 at 21:26

Sunday, May 11, 2008 at 21:26
Tim.
My system was the same as Wayne's. The only difference was I had a T piece after the pump which enabled cold water to be used as well as hot.The shower was controlled by hot & cold taps. Worked great.
Vince
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FollowupID: 569443

Reply By: Michael ( Moss Vale NSW) - Sunday, May 11, 2008 at 17:44

Sunday, May 11, 2008 at 17:44
What brand of heat exchange is it?? Michael
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AnswerID: 303259

Follow Up By: Tim Owen - Sunday, May 11, 2008 at 17:54

Sunday, May 11, 2008 at 17:54
Don't know, looks like a glind. Why?
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FollowupID: 569395

Reply By: Member - Crazy Dog (QLD) - Sunday, May 11, 2008 at 17:50

Sunday, May 11, 2008 at 17:50
Has anyone made one of these at home and if so what did you do?


Looking forward to replies on this one..

Grrr!!!
AnswerID: 303263

Follow Up By: Wayne (NSW) - Sunday, May 11, 2008 at 18:38

Sunday, May 11, 2008 at 18:38
Crazy Dog,

A mate of mine had a look at my Twine Heat Exchange when I first got it and had one made.

80mm dia, Copper tube 200/250mm long.

13mm copper tube coiled to fit inside the 80mm copper tube.

Seal the end of the 80mm copper tube with the coil inside and solider hose fittings.

One heat exchange.

Cost??????

If you can do all the work yourself and only up for the copper it would be very cheap.

Wayne
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FollowupID: 569402

Follow Up By: Member - Vince B (NSW) - Sunday, May 11, 2008 at 21:22

Sunday, May 11, 2008 at 21:22
Crazy Dog.
I have had my copper heat exchanger for years.
Haven't got round to fitting it to latest vehicle yet.
The exchanger is very similiar to the one mentioned in Wayne's follow up.
Vince
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FollowupID: 569441

Reply By: Member -Pinko (NSW) - Sunday, May 11, 2008 at 18:47

Sunday, May 11, 2008 at 18:47
We have a Twine. It has been on a sixty, eighty and now on a seventy series V8 TD. The water circulates from the block to the heater then the heat exchanger.The dash slider is on hot with no fan. When we heat shower water we don't fit the shower head. The ten or twenty litre water supply sits on the ground and the under bonnet hoses, both inlet and outlet are long enough to reach the water container. The water recirculates until it is hot enough to shower then the motor is turned off and the pump continues to run until the heat exchanger cools a little. Then click on the shower rose and shower without the motor running. This prevents any sudden rushes of really hot water especially with younger kids.
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AnswerID: 303280

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