Suburban water heater convert 110 V to 240 volt

Submitted: Tuesday, Oct 05, 2021 at 16:45
ThreadID: 142685 Views:6378 Replies:5 FollowUps:20
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I have a SW6DEA Suburban LPG / 110 V electric water heater in an imported RV.

Has anyone converted these to 240 Volt from 110 Volt US spec ?

I can see 240 volt elements on ebay for $ 50 but the PC boards appear to be around $ 350 each and thermostat $ 110 each.

Is there a cheaper way to do this or not worth it ?

Is there anyone in NSW who services / repairs these ?
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Reply By: RMD - Tuesday, Oct 05, 2021 at 17:30

Tuesday, Oct 05, 2021 at 17:30
Vroom Vroom
Is it possible for you to fit/have fitted, a step down transformer, ie 240 down to 110 for the circuitry power source, fairly straight forward, and fit a 240v element to the unit and have the 110 operate switch a relay to turn element on and off? A competent electrician should be able to achieve that!
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Reply By: Peter_n_Margaret - Tuesday, Oct 05, 2021 at 17:41

Tuesday, Oct 05, 2021 at 17:41
Technically all sorts of solutions will work.
Legally it will be cheaper to replace the HWS.
Cheers,
Peter
OKA196 motorhome
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Reply By: Peter_n_Margaret - Tuesday, Oct 05, 2021 at 19:00

Tuesday, Oct 05, 2021 at 19:00
Vroom Vroom, I assume that you are the original importer of this RV?
My info is a bit dated, but I recall that imported RVs can be used by the original importer more or less "as is" from an electrical perspective, but that they can never be sold (or even given away) until they totally comply with Australian regulations. That means every AC appliance and every AC component (including the actual wiring) must be either approved to the local regs or replaced. Modifying and approving most stuff will often cost more than it is worth, although a water heating element might be an exception if the local model is effectively identical and just the element needs to be changed.
Fitting a transformer is not an option in this case. It may be if you don't intend to ever sell the vehicle.
So what you should do now, may well depend on your future plans for the RV.
Cheers,
Peter
OKA196 motorhome


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Follow Up By: VroomVroom - Tuesday, Oct 05, 2021 at 19:15

Tuesday, Oct 05, 2021 at 19:15
thats handy info , we are the third owner , it was imported from USA and sold to someone , then damaged by flood and purchased by us.

I am in the process of replacing other electrical equipment anyway so now i know i have to pull through new cables to replace the american stuff which is quite easy.

You have made up my mind to replace the HWS rather than replace the PCB and element.

the importer and seller would have both broken the law before we got it ....
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Follow Up By: Peter_n_Margaret - Tuesday, Oct 05, 2021 at 19:20

Tuesday, Oct 05, 2021 at 19:20
Is it registered?
Cheers,
Peter
OKA196 motorhome
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Follow Up By: Allan B (Sunshine Coast) - Tuesday, Oct 05, 2021 at 19:39

Tuesday, Oct 05, 2021 at 19:39
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Peter, the "information" that you mentioned possibly came from Collyn Rivers who published such subject in several places but most comprehensively here.
It certainly is a matter of concern.
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Allan

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Follow Up By: VroomVroom - Tuesday, Oct 05, 2021 at 19:50

Tuesday, Oct 05, 2021 at 19:50
Peter , It was previously registered but unregistered when sold to us.

We intend using it as a site accommodation while we build a home so we wont be getting rego.

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Follow Up By: VroomVroom - Tuesday, Oct 05, 2021 at 20:03

Tuesday, Oct 05, 2021 at 20:03
Allan

Thankyou , i wasn't aware of the requirement to use double pole switched GPO outlets for the 240 V

Lucky i didnt buy the 240 v outlets yet.

Now to find where i get double pole switches from ? :(

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Follow Up By: Allan B (Sunshine Coast) - Tuesday, Oct 05, 2021 at 20:56

Tuesday, Oct 05, 2021 at 20:56
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Double pole switches and power outlets are available from all electrical suppliers and even Bunnings.

But I am bound to advise you that they should only be installed by a licensed electrician.
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Allan

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Follow Up By: Member - Racey - Thursday, Oct 07, 2021 at 11:08

Thursday, Oct 07, 2021 at 11:08
The last double outlet I bought was $32-00, 2 to 3 time the price of a standard outlet. :-(
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Follow Up By: Peter_n_Margaret - Thursday, Oct 07, 2021 at 15:37

Reply By: qldcamper - Thursday, Oct 07, 2021 at 08:23

Thursday, Oct 07, 2021 at 08:23
Good advice Allan, all the work he speaks of should only be performed by a licensed sparky, and gas fitter too.

Correct me if I am wrong but isnt there something in the regulations about the access door to the living quaters being on the RHS that affects the sailability of american built motor homes here too?
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Follow Up By: VroomVroom - Thursday, Oct 07, 2021 at 09:44

Thursday, Oct 07, 2021 at 09:44
Correct

They fit a new door on the LHS before or at point of import but the RHS door is retained.

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Reply By: Member - LeighW - Thursday, Oct 07, 2021 at 11:04

Thursday, Oct 07, 2021 at 11:04
Looking around the net it seems the only difference between the 110V version and the 240V unit is the element. It appears the module is the 12V igniter when running on gas.

I would however contact the manufacturer to ensure the switch and thermostat are rated for 240V. If that is the case any Suburban repairer/caravan repairer etc should be able to change the element for you.

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Follow Up By: Zippo - Thursday, Oct 07, 2021 at 11:33

Thursday, Oct 07, 2021 at 11:33
If that is the case with the heater, the only (remaining) issue for the OP is the original cable (voltage rating) and the power outlets.

Also to note that although the OP's stated intention is for on-site accom during a build, what then? The prospect of on-selling and registration leave these conversion issues unresolved.
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Follow Up By: Nomadic Navara - Thursday, Oct 07, 2021 at 18:44

Thursday, Oct 07, 2021 at 18:44
Zippo, whether it is road registered or not it remains a transportable structure. The title of AS/NZS-3001:2008 is "Electrical installations—Transportable structures and vehicles including their site supplies"

You will see in the preface

"This edition was prepared to update the requirements for electrical installations associated
with transportable structures and vehicles (formerly known as relocatable premises) and
their site supplies following the issue of AS/NZS 3000:2007. It includes provisions for the
connection of electric power to various types of transportable structures and vehicles,
including caravans and various temporary structures such as tents used for domestic and
commercial purposes. "
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Follow Up By: Geoff (Newcastle, NSW) - Sunday, Nov 28, 2021 at 16:55

Sunday, Nov 28, 2021 at 16:55
Peter D has nailed it.
If the owner intends to connect this RV to the mains here in Australia (Yes, even using an extension lead) it must comply with AS3000:2007 and AS3001:2008
There's no ifs, no buts and absolutely no wriggle room.
A piece of important trivia, at the moment there is only one Australian Standard backed by law, AS3000 and all its various releases.
As I tell the bright young lads that work for me, flaunt AS3000 at your peril. You are fundamentally lubing the broom handle with ground glass and dencorub and handing it to the judge,
Geoff,
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Follow Up By: Allan B (Sunshine Coast) - Sunday, Nov 28, 2021 at 17:17

Sunday, Nov 28, 2021 at 17:17
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Geoff, I'm confused. Are you saying that AS/NZ S3001 is not being referenced in legislation by the State Governments of Australia?

The way your post reads, of all the Australian Standards, only AS/NZS 3000 is enforceable by Australian law.
I doubt that is what you meant to convey.


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Follow Up By: Geoff (Newcastle, NSW) - Sunday, Nov 28, 2021 at 17:24

Sunday, Nov 28, 2021 at 17:24
Hello Allan,
No, I am trying to say quite the opposite, rather poorly it seams. The relevant state and territory governments certainly do have AS3000 listed in legislation.
All the other Australian Standards are best practice. It'd be a brave person who ignores any of the Australian Standards and attempts to argue with a court of law on their content.
I had this discussion a few years ago when doing a Working at Heights course, the trainer didn't know AS3000 was backed by legislation and was suggesting all Australian Standards are best practice.
Geoff,
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Follow Up By: Allan B (Sunshine Coast) - Sunday, Nov 28, 2021 at 19:18

Sunday, Nov 28, 2021 at 19:18
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Geoff, you are still not making sense. Have you been drinking? lol

You say "All the other Australian Standards are best practice." This is simply not so. Most 'electrical' Standards are referenced in legislation, particularly those that deal with safety. A few, generally initiated by industry bodies, serve as references to manufacture such as AS 60422 "Mineral Insulating Oils for Transformers" which have no legislative association but allow purchasers to reference their requirements.
"Best practice" is not a term used in Australian Standards.

I would expect a "Working at Heights" instructor to be well versed in appropriate Standards but he probably has no reason to know that AS/NZ 3000 is referenced in law.

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Follow Up By: Geoff (Newcastle, NSW) - Sunday, Nov 28, 2021 at 19:32

Sunday, Nov 28, 2021 at 19:32
Hello Allan,
No drinking here and I can now see where I wasn't making sense. My net wasn't cast wide enough.
You are absolutely correct, most all electrical standards are backed by legislation. As you say, especially those that deal with safety.

Your reference to AS60422 is an excellent example, when proposing to purchase a transformer the end user can place a reference to the standard in a tender document and expect the proposed supplier to comply.

Same with a recent project we did. As part of our suite of offerings we do solar skids for fixed installations in mining, water and waste water to name a few examples.
I was in a meeting with a well known consultancy company recently. Their bright young engineer stated, "we want the skid to comply with the Australian Standard and have 3 days of sunless autonomy"
My question was "Ok, which do you want? The Australian Standard or 3 days of sunless autonomy?"
His answer? "What does the Australian Standard say?"
My answer, "5 days"
One needs to know a deal more than the existence of the relevant standard.
Geoff,
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Follow Up By: Allan B (Sunshine Coast) - Sunday, Nov 28, 2021 at 19:38

Sunday, Nov 28, 2021 at 19:38
Geoff,

Perhaps you could have told him that ........ "OK, we could cut it down to 3 days from the Standards 5 days but a surcharge will apply" lol
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Allan

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Follow Up By: Nomadic Navara - Sunday, Nov 28, 2021 at 20:33

Sunday, Nov 28, 2021 at 20:33
Geoff, The Australian standards often reference other standards. If a standard that has been adopted into law as AS/NZS 3000 is, we are bound by that law to adhere to that standard. If a standard makes reference to another standard or sections of a standard, are we not also bound by that standard of section of that standard? Please correct me if that is not so. If so, can you please advise which are the principal standards are referenced in AS/NZS 3000?


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Follow Up By: Geoff (Newcastle, NSW) - Sunday, Nov 28, 2021 at 20:52

Sunday, Nov 28, 2021 at 20:52
Hello Peter,
That's my understanding too.
As Allan has quite clearly stated, any electrical standard related to safety is backed by law.
That would make both AS3000:2007 and your reference to AS3001:2008 of equal status under law.
They certainly refer to each other.
Geoff,
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Follow Up By: Allan B (Sunshine Coast) - Sunday, Nov 28, 2021 at 21:28

Sunday, Nov 28, 2021 at 21:28
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Peter,
It depends on how the reference is made. If it is such as "in accordance with (reference)" then that forms part of the subject Standard and is part of the legislation.
If however, the reference is simply for information, such as "refer to (reference)" then it is not part of the subject Standard and accordingly not legislated.

Did you have something specific in mind?
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Allan

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