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Headmaster failures
Hey guys. Mostly just read the forum but chime in once every blue moon. I have a question that no one has ever been able to answer. Hoping someone can help me wrap my head around this.
Headmaster failures in summer. A co worker called me today, unit running with high head. Talk him through it, headmaster was bypassing. Cut the stem to get unit running and need to replace valve. Great.
But here's my question. How does the valve get stuck bypassing mid summer? For example, if it happened in fall or spring, colder nights and warmer days, valve doing its thing i can see how it's get stuck. But 3 months into summer? I don't get it. Losing the dome charge would only help keep that valve closed. So that's not it.
Iv seen this type of failure a few times, every time i wonder how/why it failed. When i ask senior techs/bosses i just get an explanation of what a headmaster does.
Can any one shed some light on this sort of failure?
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Pressures equalizing in off cycle causing the valve to move thinking it needs to regulate.
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I can't fix it if it won't stay broke..
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I had a problem head master bypassing on a hot summer day , cut the tail to relieve the dome pressure did resolve the issue , So used my pinch off toll on the bypass to cut the flow of gas , instant resolution unit running normal . Left the pinch off tool locke in place until return with replacement headmaster when we could schedule the job . Done that at least 3 times
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What has the coldest ambient been? Both day&nite temps.
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Headmaster failures
Originally Posted by
COOLJIM
I had a problem head master bypassing on a hot summer day , cut the tail to relieve the dome pressure did resolve the issue , So used my pinch off toll on the bypass to cut the flow of gas , instant resolution unit running normal . Left the pinch off tool locke in place until return with replacement headmaster when we could schedule the job . Done that at least 3 times
I learned why you only break off the end of the tail, and not break it off on the dome....
Was up in Boone, cold as crap, wind blowing through the mountains and snowing like crazy. Meat cases were on a single condenser and went down. Headmaster stuck and was just bypassing hot gas.
Broke the tail off thinking I’d run both fans on the cycle control until I got back, and found out the diaphragm under the dome was leaking by. So I solved the bypass but now I had a leak.
Ehhhhh. So I had a fine thread self tapping just a little bigger than the hole and a rubber washer, covered all that in jb weld and wrapped scotch rubber electrical tape (scotch 88?) and put a hose clamp over the whole s!$@ show. Holy crap it held... until I got back.
Would have been so much simpler to snip the end of the tail and open it up with a pair of pliers... and I would have had room for a pinch off tool.
Been in the field a long time. But there is always that one lol.
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I can't fix it if it won't stay broke..
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BadDaddy, that actually makes alot of sense and I now feel like i should of thought of that. Wasnt thinking about what happens once pumped down.
Terry, day temps have been in high 80s to mid 90s. Night temps in the 70s. Taking into consideration what BigDaddy mentioned this is making sense to me now.
This is why i love this field. Keeps you on your toes and always learning somthing new, or at least taking a different train of thought. I had my lightbulb moment. Thanks guys.
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Originally Posted by
BadDaddy420
I learned why you only break off the end of the tail, and not break it off on the dome....
Was up in Boone, cold as crap, wind blowing through the mountains and snowing like crazy. Meat cases were on a single condenser and went down. Headmaster stuck and was just bypassing hot gas.
Broke the tail off thinking I’d run both fans on the cycle control until I got back, and found out the diaphragm under the dome was leaking by. So I solved the bypass but now I had a leak.
Ehhhhh. So I had a fine thread self tapping just a little bigger than the hole and a rubber washer, covered all that in jb weld and wrapped scotch rubber electrical tape (scotch 88?) and put a hose clamp over the whole s!$@ show. Holy crap it held... until I got back.
Would have been so much simpler to snip the end of the tail and open it up with a pair of pliers... and I would have had room for a pinch off tool.
Been in the field a long time. But there is always that one lol.
Sent from my iPhone using Tapatalk
Did the same thing on a hoshi . Lost the whole charge in minutes. But a ice machine is not critical. Replace the headmaster the next day. But I will never do that again. Pinch off and come back later is the way to go!
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Originally Posted by
Chill_Guy
Hey guys. Mostly just read the forum but chime in once every blue moon. I have a question that no one has ever been able to answer. Hoping someone can help me wrap my head around this.
Headmaster failures in summer. A co worker called me today, unit running with high head. Talk him through it, headmaster was bypassing. Cut the stem to get unit running and need to replace valve. Great.
But here's my question. How does the valve get stuck bypassing mid summer? For example, if it happened in fall or spring, colder nights and warmer days, valve doing its thing i can see how it's get stuck. But 3 months into summer? I don't get it. Losing the dome charge would only help keep that valve closed. So that's not it.
Iv seen this type of failure a few times, every time i wonder how/why it failed. When i ask senior techs/bosses i just get an explanation of what a headmaster does.
Can any one shed some light on this sort of failure?
Before cutting anything block the condenser and see if the head comes up and the valve returns to normal.
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Originally Posted by
pecmsg
Before cutting anything block the condenser and see if the head comes up and the valve returns to normal.
Thanks for that tip. I was taught by old school not so technical guys. I was only taught to feel the lines. Not a big fan of this method. Having more than one method is critical. I really appreciate that info. This is exactly why i came here. You guys got me thinking about this differently than i have been.
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