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Old 10-02-2011, 03:42 PM   #1
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Boiler System Repair


I need to replace the expansion tank and two zone valves on my boiler system. I have all the parts - my questions center on draining and re-filling the system. The setup on the lines for the zone valves (from top to bottom) are: drain valve (to attach garden hose), shut off valve, zone valve. There are no additional valves from the zone valves to the boiler. The expansion tank is attached near the ceiling on the system supply line. There is a shutoff valve about half way between the boiler and the expansion tank. Do I need to drain the entire system from the bottom of the boiler? Can I just shut off the four shutoff valves (one for each zone valve and one on way to expansion tank) and drain from the two drain valves near the zone valves that are being replaced? Will this be enough draining to also allow me to work on the expansion tank? Will just turning the water supply back on after repairs be enough to re-fill the system? Can anyone supply step by step instructions? Any and all information will be greatly appreciated.

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Old 10-02-2011, 05:50 PM   #2
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Do you happen to have or take picture of were you want your tank or your system?
If you want step by step how to's

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Old 10-02-2011, 06:11 PM   #3
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Originally Posted by Mark Potter
Do you happen to have or take picture of were you want your tank or your system?
If you want step by step how to's

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If not you can shut the feed to boiler off, power down boiler and shut the shut offs that are below if there below the zone vales to replace.
Turn the valve off to expansion tank drain the tank, replace the tank and soder your cupping.
Remember were your psi was or should be when you turn every thing back on.

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Old 10-02-2011, 10:48 PM   #4
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Thanks for the reply Mark. Here are some photos. In picture 2027 the tank is up and to the right about 3 to 4 feet. The shut off valve at the top of the picture is the closest one to the tank. Pictures 2026 and 2031 show the zone valves. The two on the left need to be replaced. Picture 2019 shows the line from the zone valves leading back to the boiler. Hopefully this helps. Thank you for taking a look.


Boiler System Repair-img_2026.jpg

Boiler System Repair-img_2027.jpg

Boiler System Repair-img_2028.jpg

Boiler System Repair-img_2029.jpg

Boiler System Repair-img_2031.jpg
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Old 10-03-2011, 01:53 PM   #5
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Boiler System Repair


Quote:
Originally Posted by slamseven
Thanks for the reply Mark. Here are some photos. In picture 2027 the tank is up and to the right about 3 to 4 feet. The shut off valve at the top of the picture is the closest one to the tank. Pictures 2026 and 2031 show the zone valves. The two on the left need to be replaced. Picture 2019 shows the line from the zone valves leading back to the boiler. Hopefully this helps. Thank you for taking a look.

<img src="http://www.diychatroom.com/attachment.php?attachmentid=38994"/>

<img src="http://www.diychatroom.com/attachment.php?attachmentid=38995"/>

<img src="http://www.diychatroom.com/attachment.php?attachmentid=38996"/>

<img src="http://www.diychatroom.com/attachment.php?attachmentid=38997"/>

<img src="http://www.diychatroom.com/attachment.php?attachmentid=38998"/>
This looks Like a peerless boiler? Correct
Do you have domestic hot water with this?

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Old 10-03-2011, 02:23 PM   #6
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Mark - the boiler is a Vaillant and the hot water system is separate. Hopefully this helps. Thanks
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Old 10-03-2011, 02:36 PM   #7
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Originally Posted by slamseven
Mark - the boiler is a Vaillant and the hot water system is separate. Hopefully this helps. Thanks
Ok then well for expansion tank all you have to do is isolate it by shutting the valve off same as zone valves.
Are you replacing the zone valves with circulators? or keeping the zone valves just updating them?
Do you have a spiral vent by the boiler?

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Old 10-03-2011, 03:17 PM   #8
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Here are two more picture. One showing the water suppy (2030) and the other showing the spiral vent (2032) you asked about (I believe). This vent is on the supply line leaving the boiler that leads to the shutoff valve and then to the expansion tank. That one shutoff valve will isolate the expansion tank? There is no shut off valve after the expansion tanking leading to the rest of the system. Won't all the water currently in the system be an issue since there is no shut off after the expansion tank? I am not updating the zone valves with circulators, just updating the zone valves. The two in question are stuck in the closed position and not allowing heat to those loops. They are "wet" valves and I am replacing them with "dry" valves so in the future I can replace the powerhead and actuator motor without draining the system.

Boiler System Repair-img_2030.jpg

Boiler System Repair-img_2032.jpg
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Old 10-05-2011, 07:12 PM   #9
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Quote:
Originally Posted by slamseven
Here are two more picture. One showing the water suppy (2030) and the other showing the spiral vent (2032) you asked about (I believe). This vent is on the supply line leaving the boiler that leads to the shutoff valve and then to the expansion tank. That one shutoff valve will isolate the expansion tank? There is no shut off valve after the expansion tanking leading to the rest of the system. Won't all the water currently in the system be an issue since there is no shut off after the expansion tank? I am not updating the zone valves with circulators, just updating the zone valves. The two in question are stuck in the closed position and not allowing heat to those loops. They are "wet" valves and I am replacing them with "dry" valves so in the future I can replace the powerhead and actuator motor without draining the system.

<img src="http://www.diychatroom.com/attachment.php?attachmentid=39018"/>

<img src="http://www.diychatroom.com/attachment.php?attachmentid=39019"/>
Sorry for late reply your expansion tank is what it is the boiler puts the expanded water in the tank and holds it there. there is not in and out just in. Therefore you need shut off to u can empty the tank with out emptying the boiler.

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Old 10-06-2011, 08:01 AM   #10
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Thanks Mark, that makes sense. So the shutoff valve will keep the water in the boiler. Since there in no valve from the expansion tank to the rest of the house, the water throughout the system will drain out, correct?
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Old 10-06-2011, 08:20 AM   #11
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Quote:
Originally Posted by slamseven
Thanks Mark, that makes sense. So the shutoff valve will keep the water in the boiler. Since there in no valve from the expansion tank to the rest of the house, the water throughout the system will drain out, correct?
Thats correct and as far the zone valves you can also drain the entire system and put shut offs both top and bottom of the valve this way you can replace them easer by isolating just the valve.

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Old 10-10-2011, 10:40 PM   #12
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Mark - thank you for your help. Repair work has been completed. Now I am having issues bleeding the air out of the system. I am going to start a new thread on bleeidng the air out. Thanks again.
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Old 10-10-2011, 10:47 PM   #13
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Mark - thank you for your help. Repair work has been completed. Now I am having issues bleeding the air out of the system. I am going to start a new thread on bleeidng the air out. Thanks again.
Ok no problem glad to have helped!

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