Coolant flow to heat exchanger fitted to a 1hz
Submitted: Sunday, May 11, 2008 at 17:13
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Tim Owen
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?
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?
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
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
FollowupID:
569443