boiler pressure too high

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Old 12-23-14, 08:39 AM
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boiler pressure too high

this is a residential home heating system the boiler pressure started kicking the release valve set at 30psi i first replaced valve but realized the pressure was too high about 31 psi I then thought is was the expansion tank so i replaced amtrol filltrol tank and auto feed valve and the air valve on the air separator but system still gets to high at times it seems that the indirect fired water heater could be the problem as everything else i can think of has been replaced unless new replacements are defective any advice would be helpful. boiler heats to 175 and cools down to about 110.
 
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Old 12-23-14, 09:08 AM
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amtrol filltrol tank and auto feed valve
Hi Roger,

Can you elaborate a bit on exactly what you mean by this?

Do you mean the 'auto feed' valve that is part of the "FillTrol System"



Or do you mean something else?
 
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Old 12-23-14, 09:12 AM
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Yes exactly what i mean installed new tank, valve.
 
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Old 12-23-14, 09:15 AM
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And when you installed the new tank, it was precharged to 12 PSI and when you first turned the system back on it initially pressurized to 12 PSI and leveled off?

And then slowly crept up too high?
 
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Old 12-23-14, 09:21 AM
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Yes actually it looked like it was charged to around 20 when opened the ball valves to auto feed valve since i have reduced pressure to 15 but the pressure keeps creeping up to around 30 after a few heating and cooling cycles
 
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Old 12-23-14, 10:09 AM
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You can verify where the trouble is maybe...

Set the boiler pressure to 12-15PSI by draining some water, and shut off the manual water feed valve and run the boiler for a while.

If pressure no longer creeps up, it means that you may have gotten some 'crud' in the new water valve. ('crud' builds up in water lines over time and if the lines are not flushed out before installing new valves this can happen)

If pressure still creeps up, then shut down the indirect water heater by valving off the pipes and monitor pressure to see where it goes.

What make/model is the indirect?
 
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Old 12-23-14, 12:13 PM
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its a superstor ultra ss-45 i have shut down the indirect water heater before, it seemed to stay constant but i will try again after your first suggestion is their any other way to check the water heater as it is rather expensive to change unnecessarily. When i pull off the expansion tank the amtrol valve still drips for a period of time is that normal i know the other valve did it also.
 
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Old 12-23-14, 03:09 PM
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is their any other way to check the water heater
Other than disconnecting it and setting up to hydrostatically test it, none that I can think of.

If you valve off the indirect from the boiler and the pressure no longer rises that would be pretty conclusive to me.

It's a process of elimination...
 
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Old 12-23-14, 04:44 PM
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If you find the indirect is the cause go with the contender. 1/2 the price with 7 yr warranty...

Superstor Contender, SSC-35, Glass Lined Indirect Water Heater

How old is your ultra????? You have a limited lifetime warranty.. If you are the original owner...

http://bostonheatingsupply.com/HTP/S...20Warranty.pdf

.
1.
Residential Use
-
During the remaining lifetime of the water heater, HTP will repair or rep
lace, at its option, any water heater having a defect or malfunction that results in a water leak from the outside jacket, inner tank, or heat exchanger as a result of normal use and service. It is expressly agreed between HTP and the original consumer pur chaser that repair or
replacement are the exclusive remedies of the original consumer purchaser
 
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