Adjusting HW Tempering Valve

Submitted: Thursday, Aug 22, 2013 at 17:08
ThreadID: 103993 Views:4768 Replies:2 FollowUps:7
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Can anyone give me some advice on the above. HW in our caravan is no longer very hot, how do I adjust the tempering valve? Could it be a build up of debris at the inlet filter causing the problem?
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Reply By: Notso - Thursday, Aug 22, 2013 at 18:01

Thursday, Aug 22, 2013 at 18:01
Don't know about yours but mine has a red knob on it that you can turn to increase or decrease the temp. This is under the van near the shower end.

First thing though, is the hot water at the kitchen sink still as hot as it used to be? Is the delivery volume about the same?
AnswerID: 516909

Follow Up By: DaveB2 - Thursday, Aug 22, 2013 at 20:19

Thursday, Aug 22, 2013 at 20:19
Thanks Notso.
I've had a look at the valve and have in fact removed the red/orange plastic cap. However, it doesn't seem to be adjustable unless a special tool is required ( which I've read about having researched the subject on the Internet). Both outlets, in the sink and in the bathroom area are the same lukewarm temperature. Having run the taps and felt the pipes under the van I'm convinced the tempering valve is admitting too much cold water for some reason.
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FollowupID: 796445

Follow Up By: Member - Niss42 - Friday, Aug 23, 2013 at 14:03

Friday, Aug 23, 2013 at 14:03
Dave, the tempering valve is only used to limit the water temperature to the shower to prevent scalding.
If the hot water at the sink and hand basin is not hot I would be looking at the hot water unit.
Good luck,
Barry.
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FollowupID: 796471

Follow Up By: Notso - Friday, Aug 23, 2013 at 16:44

Friday, Aug 23, 2013 at 16:44
The hand basin can be hooked into the same flow as the Shower, but if the sink isn't hot then something is astray as the sink is usually hooked directly to the Hot Water unit.
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FollowupID: 796486

Follow Up By: DaveB2 - Friday, Aug 23, 2013 at 20:21

Friday, Aug 23, 2013 at 20:21
Guys
I've traced the pipe work pretty carefully and am convinced thar the HW from the heater only goes directly to the tempering valve. The tempered water then gets supplied to all services, bathroom,kitchen and shower. I also don't think anything is wrong with the heater as when I've drained the system the water is very hot. I'm now convinced that the valve either needs cleaning out, or needs to be replaced.
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FollowupID: 796499

Reply By: Rockape - Thursday, Aug 22, 2013 at 18:51

Thursday, Aug 22, 2013 at 18:51
Dave,
Just something to think about. Calcium build up in the hot water system can cause exactly the same symptoms as yours. Some areas you may have used water from can have very high calcium deposits in their water supplies, especially if sourced from bores.


AnswerID: 516912

Follow Up By: DaveB2 - Thursday, Aug 22, 2013 at 20:24

Thursday, Aug 22, 2013 at 20:24
Thanks Rockape. You have confirmed what I was told when I called a manufacturer of these valves the other day. My problem is that I'm not sure what valve I have fitted, but it does look as though I can get the connections off and have a look inside. So if the inlet filter is accessible, I'll see if it's possible to clean it. I did flush out quite a lot of calcium deposits the last time I changed the anode in the heater, so I think you are on the right track.
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FollowupID: 796446

Follow Up By: Kyle H - Saturday, Aug 24, 2013 at 08:09

Saturday, Aug 24, 2013 at 08:09
Hi
Mine has an inserted strainer on the hot and cold inlets to the valve. They can block or restrict water inlet flow. Maybe this is your problem.
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FollowupID: 796531

Follow Up By: DaveB2 - Saturday, Aug 24, 2013 at 16:49

Saturday, Aug 24, 2013 at 16:49
Thanks for that Kyle. I took the valve off today and had a look inside. There was an insignificant amount of debris in the metellic inlet strainer (not really a filter) but nothing of note at the outlet. I also took the metering piston and spring out, but again not too much to see in the way of deposits. I gave the internal bores a clean and re-assembled. It seems to have improved matters but not back entirely to its original output temp.
I didn't disassemble the 'leg' which I think adjusts the temperature setting, but if I get time during our travels, I'll have a go and keep you all posted. By the way, a replacement will cost just over $150!
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FollowupID: 796553

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