Heater Bypass Valve Setting

garywi

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Jul 12, 2013
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Phoenix, AZ
Hey Guys, I never understood the heater by-pass valve. How should it be set. I think I want water always flowing through the heater so how should this valve be set. Thank you!
 

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The handle indicates valve ball position. When the handle lies along the axis of the valve, the valve is open. When the handle lies 90° across the axis of the valve, the valve is closed.

 
The handle indicates valve ball position. When the handle lies along the axis of the valve, the valve is open. When the handle lies 90° across the axis of the valve, the valve is closed.

Thank you. I don't understand the flow of water to the heater so I don't know where to set this valve.
 
I don't understand the flow of water to the heater so I don't know where to set this valve.

You need to try running your heater with the valve OPEN versus CLOSED. One way the heater should run and the other it should not.
 
As long as you are not running your pump full speed (and you shouldn't be) you should be able to completely close (handle across the pipe) that valve and have all water go through the heater. It is designed to accept the full flow up to 125gpm. Looks to be an LX or LT heater (same heater, different control panel). If you, for some reason, use the full speed, the handle is probably already set to its proper position. Your pump is capable of about 160+gpm at full speed, hence the need for a bypass.
 
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As long as you are not running your pump full speed (an you shouldn't be) you should be able to completely close (handle across the pipe) that valve and have all water go through the heater. It is designed to accept the full flow up to 125gpm. Looks to be an LX or LT heater (same heater, different control panel). If you, for some reason, use the full speed, the handle is probably already set to its proper position. Your pump is capable of about 160+gpm at full speed, hence the need for a bypass.
Thank you. I run my pump at 3450rpm for a hour hours to get my floor vac running right. Long story. Are you saying by design, I should have only a percent of my water running through the heater, like it is set now
 
If your heater will light and heat the way you want with the handle the way it is, leave it. At 3450 rpm your pump is trying to move about 160gpm. That doesn't mean that it is, but it is trying to. There are other factors that will determine how much water actually flows. The builder, most likely, installed that bypass to be sure the heater was damaged by excess water flow.
 
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