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Old 01-28-2008, 05:09 PM   #1
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I drained the hot water tank to day and re-filled using city water then using the pump I got a lot of air coming out of the the hot water faucet,then the water would run with good pressure, but when I turned off the faucet the pump would run for about 15-20 sec. Faucet turned on, water will run with good pressure --with no pump running-- for about 5 sec., then the pump comes on. Turn off faucet and the pump runs 8 to 10 sec. I'm thinking there is a air bubble in the hot water tank working like a accumulator tank.
Maybe this is the way it's supposed to work but from the time we bought this M/H the pump came on when the faucet was opened and the pump went off when faucet was turned off.
How should the pump work in an M/H without an accumulator tank?
Thanks, Greg
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Old 01-28-2008, 05:09 PM   #2
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I drained the hot water tank to day and re-filled using city water then using the pump I got a lot of air coming out of the the hot water faucet,then the water would run with good pressure, but when I turned off the faucet the pump would run for about 15-20 sec. Faucet turned on, water will run with good pressure --with no pump running-- for about 5 sec., then the pump comes on. Turn off faucet and the pump runs 8 to 10 sec. I'm thinking there is a air bubble in the hot water tank working like a accumulator tank.
Maybe this is the way it's supposed to work but from the time we bought this M/H the pump came on when the faucet was opened and the pump went off when faucet was turned off.
How should the pump work in an M/H without an accumulator tank?
Thanks, Greg
'03 Winnebago Sightseer 30-B
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Old 01-28-2008, 05:53 PM   #3
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I agree you have air in the system, which will eventually purge. Whether it is trapped in the hot water tank specifically is a guess. From the 15-20 seconds of pump operation after you close the valve, that pretty much confirms the air inclusion. This interval should shorten to near zero in the very near future as you use the hot water another 10 or so times. The more water you pass through the more air you should remove...theoretically.
Be patient when removing these air inclusions. They can be maddeningly stubborn at times. I battled one for 2 hours (in the rain) after foolishly allowing my fresh water tank to pump dry. I was almost ready to believe I had toasted the pump when it finally pumped to pressure and shut off. Still working a year later.
Someone more familiar than me with the inside of the water heaters in these rigs may be able to shed light on the accumulator theory
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Old 01-29-2008, 02:28 AM   #4
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If I'm reading your post correctly, you should have a air cushion in the hot water tank. If your pressure relief valve was closed when you refilled the tank, the air cushion was created at the top of the tank. After numerous uses, the air cushion is absorbed into the water at which time it has to be reestablished.
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Old 01-29-2008, 03:46 AM   #5
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All of the answers you got are good. I thought that some clarification might be needed as to the air cushion in the water heater. There is a cushion in the WH to allow for the expansion of the water when heated. When that is not present, the water heater pressure relief will drip as water expands when heated and it must gosomewhere.
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Old 01-30-2008, 03:28 PM   #6
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Thanks for the help. You were right about to getting better with time. The pump runs for only about 2 sec. now.
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Old 01-30-2008, 03:41 PM   #7
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A easy way to eliminate the air is to hook up to city water and purge your system using city water pressure instead of your pump. Saves on the pump and is more efficient because of the pressure.
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Old 01-31-2008, 04:15 AM   #8
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With every RV I have ever owned, my procedure for filling the hot water tank was to put in the water heater drain plug, hook up to city water, open the relief valve and fill 'till water came out the overflow, then close the relief valve. I don't know if this means I don't have an air cushion or not; but I never had a problem with excessive air or an erratic pump. Never had a problem with the relief valve leaking either.
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Old 01-31-2008, 05:24 AM   #9
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FWIW,

The following is from Winnebago's Service Tips -

CARE & MAINTENANCE OF WATER HEATERS

Most tanks are designed with an internal air gap at the top of the tank to reduce dripping. It may be necessary to replenish the air from time to time. To replace the air start by turning off the water heater system, shut off the incoming water supply and open the closest hot water faucet. Pull the handle on the pressure-temperature relief valve straight out to allow the water to flow from the top part of the tank. Once the water has stopped flowing allow the handle on the valve to snap shut, close the faucet and re-engage the water supply.
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Old 01-31-2008, 05:41 AM   #10
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oldpa;

My water pump does the same thing. I do however have a small pressure tank down by the water pump. This is supposed to stop the pulsing of the pump when a little water is being used. If you have a small pressure tank the time frame sounds about right.

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Old 02-06-2008, 01:43 PM   #11
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I drained my hot water tank and refilled it.. purged the air out of the system... the water in the the hot water tank heats... but I cannot get hot water at any of the taps..... HELP
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Old 02-06-2008, 02:43 PM   #12
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Ace V6:
I drained my hot water tank and refilled it.. purged the air out of the system... the water in the the hot water tank heats... but I cannot get hot water at any of the taps..... HELP </div></BLOCKQUOTE>
Ace V6, welcome to iRV2.

I assume you have cold water in your cold taps. Do you get no water from the hot taps or cold water? If cold water, I would say either your hot water heater bypass valves are in the wrong position or the valves on your outside shower are open and the water is shut off at the outside shower head. Either condition will result in cold water crossing over into the hot water lines.

If you have no water from the hot water taps, then maybe you forgot to open the outlet and/or inlet valve to the hot water heater. The cross-over valve is also closed prevent any water from getting through.

Let us know what you find out.
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