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Old 05-10-2019, 12:53 PM   #15
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Snowing.....
You gonna let a little snow interrupt troubleshooting?


Com' on you got gloves .....hat/jacket


Get with it






Just yanking your chain
Grew up in WY and when I left I had seen/worked in all the snow I ever wanted.


It snowed here in Central AZ earlier this year....3" accumulated and I had to shovel walk way from house to driveway, clean off truck, scrape ice from windows and pre-warm the inside before SHE would get in.
Reminded me WHY I left WY



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Old 05-10-2019, 07:36 PM   #16
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The particles in your hot water tank is likely scale from hard water.

I started using a water softener a few years ago. Hot water tank has less scale on cleanout than before water softener.
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Old 05-11-2019, 09:01 PM   #17
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Got out work on the 5th today. While doing the yearly bearing repack I ran some tests on the water heater.


1. Brought heater up to auto shutdown. Water temp at relief valve was 130F, tape still about 90F.
2. Check voltage on both brown leads, seems to be good. 13 volts on lower brown wire
3. No voltage on upper brown wire
4. Shorted two brown wires, gas fired up, at shutoff tank temp was 157, tap water about 97.


Tomorrow I will have a cutoff valve on the cold feed to the mixing valve and test tap temp with no cold water mixed in.


I'll also swap out the ECO and Stats again. Then run everything again. Wondering if they packed the wrong Stat on the packaging card?


At least got the bearings all done.
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Old 05-11-2019, 11:46 PM   #18
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Quote:
Originally Posted by rarebear.nm View Post
Got out work on the 5th today. While doing the yearly bearing repack I ran some tests on the water heater.


1. Brought heater up to auto shutdown. Water temp at relief valve was 130F, tape still about 90F.
2. Check voltage on both brown leads, seems to be good. 13 volts on lower brown wire
3. No voltage on upper brown wire
4. Shorted two brown wires, gas fired up, at shutoff tank temp was 157, tap water about 97.



Tomorrow I will have a cutoff valve on the cold feed to the mixing valve and test tap temp with no cold water mixed in.


I'll also swap out the ECO and Stats again. Then run everything again. Wondering if they packed the wrong Stat on the packaging card?


At least got the bearings all done.

Something ain't right with those T-stats
Shut off heating at 130*F (which s/b 155*F)
Bypassed the t-stat by shorting the brown wires together and it fired up (no t-stat in circuit)
BUT it shut off heating at 157*F ....ECO opened (which s/b 180*F)


**Even when water temp got to 157*F the tap water temp was only 97*F....s/b 130*F with 157*F IN



T-stat has a spade and pin connectors ...correct?
ECO has 2 spade connectors....correct?


What are the numbers on t-stat?
What on ECO?
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Old 05-12-2019, 05:41 AM   #19
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I got rid of the mixing valve at $120-170 EA. 2nd time plugged up. Put in 140F thermostat. Now got full pressure and hot water at all faucets. Kitchen sink, dishwasher and washing machine (all furthest from hot water heater) working much better.
Shower was too hot before and about 25% volume.
Cautioned family of scolding potential.
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Old 05-12-2019, 01:15 PM   #20
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"
T-stat has a spade and pin connectors ...correct?
ECO has 2 spade connectors....correct?


What are the numbers on t-stat?
What on ECO?"


Yes on the connectors. except now the replacements for the t-stat is a spade with a pin adapter attached to it.


The temperature rating on the t-stat is 68C = 154.4F


On the ECO it 82C = 179.6F


So those units appear to be correct for this applications.


I just swapped out both ECO & t-Stat. Off to town to get the valve for the mixer cold line.
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Old 05-12-2019, 02:32 PM   #21
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Post what you find out........


This is a real head scratcher for me AND A REAL HEADACHE FOR YOU!
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Old 05-12-2019, 06:22 PM   #22
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Just throwing this out for discussion: do you have an outside shower and is it turn off completely?
Just asking.
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Old 05-12-2019, 06:35 PM   #23
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Just throwing this out for discussion: do you have an outside shower and is it turn off completely?
Just asking.
Also, I am more familiar with simpler systems, but since this started with de-winterization, is the water heater bypass valve properly set?.
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Old 05-12-2019, 06:35 PM   #24
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Quote:
Originally Posted by hamm2018 View Post
Just throwing this out for discussion: do you have an outside shower and is it turn off completely?
Just asking.

Thanks for the idea. All facets are totally off. Don't think a leaking facet would cause the temp in the water heater to off by 20 degrees.
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Old 05-12-2019, 06:52 PM   #25
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Ok installed the new valve to the mixing valve. Also replaced the ECO and t-stat.


Could not find my old chem lab thermometer. So used meat thermometer plus the IR unit.
The IR was off by about 8F.


Temperature at the tank was 148, at the tap it measured 151 with mixing value cold turned off. With cold added to mixing valve the hot was running about 102F.


My thoughts right now is that I did have two sets of bad t-stats and the mixing valve is partly plugged on the hot side.


Tomorrow I'll pull the mixing valve and see about cleaning it.


It appears that the water above the relief valve on the tank is hotter than water at that height. Seems like a significant thermal gradient forms in the tank.
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Old 05-12-2019, 09:32 PM   #26
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Very little water ABOVE T&P....that is where the 'air pocket' forms

Hot out is via a dip tube that takes water off top layer (hottest area)
T&P is slightly lower with a temp probe that sticks down

148*F...151*F within specs

Add cold into mixing valve and temp drops to 102*F.....
Either Hot to Cold Ratio is wrong due to obstructed hot
OR mixing valve temp setting is OFF (factory preset for 130*F and set screw plus plus so adjustment knob can not engage)

Yes ....2 bad sets of t-stat
Strange but that is what it appears to be.













**As for the shower question


IF shower hot/cold knobs are open and shower handle button/lever is closed the shower faucet acts like a mixing chamber......cold has slightly higher pressure/less resistance so it will dilute the hot and cause 'luke warm' temps
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Old 05-13-2019, 03:10 PM   #27
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The valves on the outdoor shower were both fully off.


I have pulled the mixing valve and have it soaking in vinegar over night. Retest in the am.
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Old 05-13-2019, 05:47 PM   #28
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Was there 'crud' in Hot inlet side of mixing valve?
Crud in hot out port of WH Tank?
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