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Adjusting Water Temps on BUNN VP17/Commercial
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1biggs
Senior Member


Joined: 2 Nov 2009
Posts: 9
Location: Md
Expertise: I love coffee

Posted Mon Nov 23, 2009, 2:52pm
Subject: Re: Adjusting Water Temps on BUNN VP17/Commercial
 

Ok yes I agree then that is very similar to mine.

~And yes I missed that part in the manual, but get this, my unit never see's that!

This is a learning curve for me with Bunn.  My problem is cold well water at 60F. This lowers tank temps
pretty quick!

Thanks for info.
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calblacksmith
Moderator
calblacksmith
Joined: 25 Nov 2007
Posts: 7,672
Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
Grinder: Azkoyen Capriccio, Major
Vac Pot: 40s era Silex
Drip: Msl. Com. brewers
Roaster: gave it a try, decided no
Posted Mon Nov 23, 2009, 3:06pm
Subject: Re: Adjusting Water Temps on BUNN VP17/Commercial
 

1biggs
All is well.
My brewer is set to 205 in the tank on a stock thermostat. This should give me a solid 200 at the brew head though I have indeed, not tested there. I am using a calibrated, NSF instant read thermometer which I allow to stabilize before I take a reading. We live at an altitude of 2,005' and I do indeed calibrate my thermometer in ice water and boiling water before use. It will not read to 0.01 deg f but it will go to 0.1 f so, for me, that is close enough.

A little about me so you know where I am coming from.  I am a quality assurance inspector for a large aircraft corp. I regularly use tools that cost from 1/4 to 1/2 million dollars so I know how to do things right. My personal shop is larger than most peoples homes. I have all the metal working tools you would likely ever want to use as well as most every hand and power general tool. I have specialized tools for machine shop, electrical work and jig and fixture work. I am a journeyman blacksmith and I teach for the California Blacksmith Assoc.  I am going to culinary school just because I can,  and as I am in my 50s and have a good job, I can afford and do spend the money need to buy quality tools be they for cooking or shop use. Yes I could buy a Fluke thermocouple but they are a little hard to wear in your arm pocket ;P

:D :D :D

 
In real life, my name is
Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
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1biggs
Senior Member


Joined: 2 Nov 2009
Posts: 9
Location: Md
Expertise: I love coffee

Posted Tue Nov 24, 2009, 7:20am
Subject: Re: Adjusting Water Temps on BUNN VP17/Commercial
 

Ok this is bothering me so I did some more testing and here are the results:

Switch 1 stamped 200F on body:

This switch cuts out at exactly 181.3F and cut in 170F

Switch 2 stamped 203F on body:

This switch cuts out at 191.8 and cuts in 178F

Modified switch 3 increasing 0.010 gap inside switch button stamped 200F on body:

Switch cuts out at 209F and cuts in 185F

So here we are, these new switches are NOT performing correctly. I can't tell where these
switches are made.

This test was done outside of the tank using tea pot on the stove and fluke tester. The best
switch 191.8 would probably see only 175-180 at the funnel due to heat absorption of funnel
and delivery tube assembly. So like I said earlier, if you have a bum switch you can turn it up
all day long and never see 200F at the funnel.

My unit was purchased in Jan of this year and this thread was started by another with similar
problems.

My only advice is if your switch is functioning properly pray it never goes bad or you will get a
over rated switch as replacement.  :(

A little about me, I am a license aviation a&p mechanic and hold avionics certs in radio installation
and repair, also a GM master auto tech with over 22 yrs experience with GM. The aircraft business
is family owned. Being a master in 3 trades I could talk about tools all day, God knows I have more
tools then this house I'm living in is worth.
One thing we both can agree on,  blowing smoke up rears - and you guessed correctly, the service
techs at Bunn will do that if you let them.

:)
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dana_leighton
Moderator
dana_leighton
Joined: 11 Jan 2002
Posts: 1,937
Location: Little Rock, AR
Expertise: I live coffee

Espresso: Isomac Relax; Caferina...
Grinder: Macap MXK; Baratza Vario-W;...
Vac Pot: Yama 5-cup
Drip: Technivorm; CCD; Melitta
Roaster: Poppery I w/PID controller
Posted Tue Nov 24, 2009, 7:40am
Subject: Re: Adjusting Water Temps on BUNN VP17/Commercial
 

1biggs Said:

I was surprised to hear
the tech tell me that Bunn feels any temp around 170 is fine as it will release the oils and flavor of beans.
Also, since the Bunn is commercial it leans toward commercial purchased coffee grinds. This means if the
coffee manufacturers are adding wood or other ingredients, then Bunn is on top of it and is adjusting out-
put temps accordingly.

Posted November 23, 2009 link

This supports the notion (stated elsewhere here in the forums I think) that lower quality coffee and roasting may not produce good results at what we consider optimum brewing temperature -- that home brewers which brew at below 195F may be optimized for lower-quality coffee. I think a blind taste test might be in order here or we risk talking tech talk with no benefit. Test lower quality coffee at 170F and at 200F -- we just might get better (albiet mediocre) coffee at the lower temperature...

 
Dana Leighton - Espresso hack and CoffeeGeek moderator
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calblacksmith
Moderator
calblacksmith
Joined: 25 Nov 2007
Posts: 7,672
Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
Grinder: Azkoyen Capriccio, Major
Vac Pot: 40s era Silex
Drip: Msl. Com. brewers
Roaster: gave it a try, decided no
Posted Tue Nov 24, 2009, 12:22pm
Subject: Re: Adjusting Water Temps on BUNN VP17/Commercial
 

Cool, we are both A&Ps. I got mine in 1982 and my pilot's lic in 1979. I also majored in industrial electricity and power generation systems  with minors in computers, aviation technology, industrial processes and welding.

I have 30+ years in aerospace in tooling and inspection  as well as 20+ years in blacksmithing but I never submitted a masters piece for a master in rating in  B S. What projects did you submit for your master ratings?

I also run a Bobcat earth moving business on the side where I do mainly grade work

 
In real life, my name is
Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
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gime2much
Senior Member


Joined: 10 Dec 2004
Posts: 1,965
Location: Sunny S Fl
Expertise: I love coffee

Espresso: La Pavoni, Astoria comm, 2...
Grinder: La Pavoni Zip, Bunn...
Drip: Bunn comm
Roaster: Popcorn popper (air),co/ufo
Posted Tue Nov 24, 2009, 2:23pm
Subject: Re: Adjusting Water Temps on BUNN VP17/Commercial
 

1biggs,   Sounds as if you are making progress, how about reporting back with the new results. I'm interested in the drop in brew temperature during the cycle. 50f drop is excessive even factoring in the 60f water you are adding to the system. Perhaps it was due only to the low starting temperature of the water in the boiler but is there any chance the well water has scaled up the heating element?

 
Dan Brewer
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harrym
Senior Member


Joined: 26 Jun 2002
Posts: 9
Location: Hill City
Expertise: I love coffee

Espresso: Rancilio Silvia
Grinder: Gaggia MDF
Vac Pot: Cory
Drip: Bunn VPR
Roaster: Air Poppery
Posted Sun Dec 13, 2009, 8:52am
Subject: Re: Adjusting Water Temps on BUNN VP17/Commercial
 

How do you check the maximum temperature of your machine?  I just measured the coffee in the pot at 170 degrees.  I burned my hand trying to measure the temperature at the spray head, but it was about 190 degrees before I dropped it.  This was with a grilling thermometer.  I ordered a digital thermometer with a flexible wire probe, which will make the job easier.  I bought this machine to try to duplicate the coffee at my favorite coffeehouse.  They use a Bunn unit and I bought some of their roasted beans.  I'm using natural spring water.  So far the coffee has been fine, but it doesn't have the same taste as theirs.  I do have the control knob turned all the way to HI.  BYW, when the coffee gets cool -- it has the same taste as the coffeehouse brew.
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gime2much
Senior Member


Joined: 10 Dec 2004
Posts: 1,965
Location: Sunny S Fl
Expertise: I love coffee

Espresso: La Pavoni, Astoria comm, 2...
Grinder: La Pavoni Zip, Bunn...
Drip: Bunn comm
Roaster: Popcorn popper (air),co/ufo
Posted Sun Dec 13, 2009, 3:29pm
Subject: Re: Adjusting Water Temps on BUNN VP17/Commercial
 

Here is what the manufacture has to say, from page 2 of this thread.

gime2much Said:

Edit: From Bunn.com, VP17 1,2,3, page 8 of the operating service manual....

Water Temperature

Place an empty funnel on an empty dispenser beneath the sprayhead. Initiate a brew cycle and check the water temperature immediately below the sprayhead with a thermometer.
The reading should not be less than 195F (91C). Adjust the control thermostat to increase the water temperature. Replace if necessary.

Posted November 20, 2009 link

If you are using a stainless funnel it should be warmed first with hot water. Steel sucks out a lot more of the heat than plastic.

 
Dan Brewer
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harrym
Senior Member


Joined: 26 Jun 2002
Posts: 9
Location: Hill City
Expertise: I love coffee

Espresso: Rancilio Silvia
Grinder: Gaggia MDF
Vac Pot: Cory
Drip: Bunn VPR
Roaster: Air Poppery
Posted Fri Dec 18, 2009, 4:30pm
Subject: Re: Adjusting Water Temps on BUNN VP17/Commercial
 

Got my digital thermometer today to check my new VPR.  With the probe in the tank [through the hole in the bottom of the fill basin], the reading was exactly 200 degrees F.  Seems to be right on the money.  Still experimenting with grind and amount of coffee.  I may get the restricted spray head later, just to see what effect it will have.
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harrym
Senior Member


Joined: 26 Jun 2002
Posts: 9
Location: Hill City
Expertise: I love coffee

Espresso: Rancilio Silvia
Grinder: Gaggia MDF
Vac Pot: Cory
Drip: Bunn VPR
Roaster: Air Poppery
Posted Sat Dec 19, 2009, 8:34am
Subject: Re: Adjusting Water Temps on BUNN VP17/Commercial
 

The coffee this morning was 174 degrees in the pot with the warmer turned off.  This was a half pot [32 ounces], and the grounds were up to within 3/4" of the top of the Bunn filter.  Coffee ground on espress setting on Gaggia MDF.  It's getting close to the taste of the coffeehouse product.  I ordered the restricted flow sprayhead, so we'll see if that makes a difference.
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