Truma HWS relief / drain valve.
Submitted: Sunday, Nov 11, 2012 at 21:30
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98968
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daz (SA)
Good afternoon all,
Had my van serviced in
Perth & the relief drain valve for the Truma HWS replaced as it was leaking water when hooked up to the mains, but not when using the water from the on board tanks.
First use at
Esperance on the mains (with a pressure limiter at the tap) & the
thing is still leaking out water. What I have discovered tho is that it is hot water which has me stuffed as it is on the cold water inlet side.
Now somebody out there may know what is going on, All I can think of is that some how water pressure is being applied to the HWS thru the hot water outlet, but I am a mere mortal. Please note the leak stops when we revert to the on board water & pump. It keeps me occupied but drives the other half around the twist.
Daz
Reply By: Member - Rowdy6032 (WA) - Monday, Nov 12, 2012 at 01:01
Monday, Nov 12, 2012 at 01:01
Hi Daz
Probably not much help but we had a similar problem with our Truma.
We were originally told we could hook it up to the mains if we kept the tap pressure down. We were not using a pressure limiter.
We subsequently found out this was incorrect and it was not to be hooked up to the mains at all. Our pressure valve had to be replaced.
The only thing I can suggest is that you try a replacement pressure limiter or only use your water from the tank.
Sorry I can't be of more help.
Regards
Rowdy
AnswerID:
498368
Follow Up By: daz (SA) - Monday, Nov 12, 2012 at 22:24
Monday, Nov 12, 2012 at 22:24
Thanks for that Rowdy
I am going to post a follow up but you were pretty
well on the money. Some one had played around with my pressure limiter
Thanks
Daz
FollowupID:
774394
Reply By: Member - Niss42 - Monday, Nov 12, 2012 at 17:03
Monday, Nov 12, 2012 at 17:03
G'day Daz.
The Temperature Pressure Relief (TPR) valve is there to protect the unit from excess
Temp or Press. There should be a metal tag on the TPR valve indicating the pressure and temperature limits, make sure the new valve has the same limits as the original, a higher rating will compromise the heater cylinder.
It is normal to have a small amount of hot water escape as the water heats up (expansion=pressure increase)
I have a different make of HWS and have not had any problems.
Barry
AnswerID:
498397
Follow Up By: daz (SA) - Monday, Nov 12, 2012 at 22:29
Monday, Nov 12, 2012 at 22:29
Thanx Pls see follow up.
the valve letting the water go is a relief/drain valve for the Truma on the cold inlet . Not a temperature pressure relief, this is part of the hot water outlet
Daz
FollowupID:
774397
Reply By: daz (SA) - Monday, Nov 12, 2012 at 22:52
Monday, Nov 12, 2012 at 22:52
Hi all I think problem solvered.
After a bit more checking I found that the AMOS adjustable water pressure regulator ( I purchased this after buying the van) that fits to the water source had been tampered with. I put it all back together & reduced the water pressure & found the relief drain valve has ceased letting water go. I did contact the caravan builder who advised "I should advise you to purchase a pressure limiting valve 350 kpa and that should solve your problem"
Now I find out that most vans have these fitted which protects the hoses,
John Guest fittings, & HWS in vans . My question to the van builder will be why this was not fitted at build time. The AMOS pressure regulator can be varied from 35 KPA to to 850 KPA. The local caravan
shop in
Esperance tells me that
John Guest fittings & Truma HWS should never be subjected to water pressure over 350 KPA
Thanx to contributors, It is all a learning curve, with plenty of curve balls thrown Daz in
Esperance but soon to be
home in SA
AnswerID:
498413