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Old 06-25-2013, 03:24 PM   #11
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You should not bleed ALL the air out of the HW Heater. There should be an air cushion at the top to allow for expansion as the water heats. This prevents the expanded water from opening the P&T Valve.

The HW Heater is designed so that the proper amount of air is left inside as water is drawn out the top outlet. Opening the P&T Valve manually impinges on that air cushion.

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Old 06-25-2013, 04:06 PM   #12
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You should not bleed ALL the air out of the HW Heater. There should be an air cushion at the top to allow for expansion as the water heats. This prevents the expanded water from opening the P&T Valve.

The HW Heater is designed so that the proper amount of air is left inside as water is drawn out the top outlet. Opening the P&T Valve manually impinges on that air cushion.

RodeoGeorge
What you say may be true, but I've been doing it ever since our first trailer with a water heater in 1975 with no ill effects or the pop off ever "popping". Guess I've been lucky.
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Old 06-25-2013, 05:40 PM   #13
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Originally Posted by RodeoGeorge View Post
You should not bleed ALL the air out of the HW Heater. There should be an air cushion at the top to allow for expansion as the water heats. This prevents the expanded water from opening the P&T Valve.

The HW Heater is designed so that the proper amount of air is left inside as water is drawn out the top outlet. Opening the P&T Valve manually impinges on that air cushion.

RodeoGeorge
So, what I've been doing is correct? All I've ever done is bleed thru the water system, as is the SOP with all trailer guides and other helpful manuals.
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Old 06-25-2013, 06:58 PM   #14
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So, what I've been doing is correct? All I've ever done is bleed thru the water system, as is the SOP with all trailer guides and other helpful manuals.
It is, but I had an almost nasty surprise on our first camping trip out this year. My winterization valves were set to "winter" mode. It actually allowed cold water to come out of the faucets when the water heater was, in fact, empty. I almost turned on the heating element before fixing the bypass and filling it.

The only sure way for me to know is checking the pressure relief valve. I know do it every time before I flip the water heater switch.
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Old 06-28-2013, 10:26 PM   #15
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since we moved to a NY state campground, there hasn't been any "burping" still using the FwTank, and pump, nothing different except the water we put in. I haven't purged anything. W T Heck. Nothing changed from our usual routine. oh well, if nothing changes from here on out, great.


Oh, 2 days of rain is trying to our friends who are tenting with us.
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