Posted Mon Nov 19, 2007, 8:32am Subject: Adjusting Water Temps on BUNN VP17/Commercial
Has anyone ever tried adjusting/increasing the brew/tank temperature on the BUNN VP17 or unit like it? I'd like to max out the machine, get the water brew temp super hot but the manual is about as warm and inviting as the unplugged stainless steel body of the machine.
So the manual is vague, technical and doesn't specifically answer the question of adjusting the temperature clearly. I may have to call BUNN's technical support line, but I'd like to know if anyone can give me a layman's rundown. I want to be careful as to not mess anything up beyond repair which is why I'm not going in or removing screws or wiring. I guess this is what you get when you buy a commercial unit for home...
Posted Mon Nov 19, 2007, 1:28pm Subject: Re: Adjusting Water Temps on BUNN VP17/Commercial
Seemed a lot simpler than I assumed (it's a BUNN, so there are only so many "switches"). My model had me turning a knob all the way to the "HI" setting. Also found another nifty something; my machine was personally signed off by the technicians and assembly persons involved!
Posted Mon Nov 19, 2007, 5:14pm Subject: Re: Adjusting Water Temps on BUNN VP17/Commercial
I have a VP17-1 and the following info on increasing the temp I got from the dealer I purchased it from, who worked for Bunn before he went on his own. The first method is behind the front plate and is easy and obvious once you remove the front plate. You already did that. In the second method, after you remove the top plate, you must remove the water tray for access. You will then see a thin coiled tubing which goes through a small nylon cap. This is attached to the temp probe. You need to pull the temp probe upwards using the thermocouble tubing. (carefully). The higher you pull it the hotter the water will be. I'm not a tech writer so I can't be much more descriptive. Good Luck. It worked for me but YMMV.
Posted Tue Nov 20, 2007, 3:21pm Subject: Re: Adjusting Water Temps on BUNN VP17/Commercial
I went inside the unit and I know what you're talking about here. There's a red line on the coiled wire that goes through the nylon cap/grommet. Does this wiring get pulled up (I pulled it up as far as it goes)? Sorry if I seem a bit misdirected by the instructions. Just want to be clear here.
Posted Tue Nov 20, 2007, 6:20pm Subject: Re: Adjusting Water Temps on BUNN VP17/Commercial
As you're trying to adjust your water temperature, realize that the temperature control system on a Bunn falls under the category of bang-bang control in which the heater comes on when the water goes below a certain temperature (probably around 195F) and turns off after the heater hits a high temperature (probably just over 200F). At any point, you water temperature can vary between these two set points.
The best way to test the impact of your changes is to measure the temperature coming out of the brew head immediately after the "OK to brew" light comes on. On my commercial unit, this is a green light on the front. When it comes on, the water temperature is at it's peak. Measuring at the same time of the heating process gives you a consistent point to compare against.
The recommendation to pull the thermocouple further out of the hot pot is basically pulling the thermocouple further away from the heating coils, which is why the temperature gets hotter. Just be careful not to pull the thermocouple out to far, as it could lead to the water boiling or the heater not actually going off at all as the temperature of the water is not actually being read by the thermocouple (worst case). Either of these cases aren't good.
Posted Tue Nov 20, 2007, 10:36pm Subject: Re: Adjusting Water Temps on BUNN VP17/Commercial
Thanks for the assistance.
The thermocouple on my machine is at its highest point under the cap, practically against it ceiling level. About the green light, my VP17 is likely a newer/alter model as it doesn't contain the light but shows alternate models having one in the manual. Also, I always brew when the tank stops roaring (heating), even did that when I had my old NBX (which never indicated it was alright to brew when the tank roared) and makes that "click" sound (something the NBX does not do as it's not as technical/adjustable as the commercial units).
Typically for best results I always pre-brew to make sure the piping, funnel and pot is heated so I get the max temps when I brew coffee.
The manual seems to suggest the tank heat can excess 230F, which is not sought out as anything above 212F is a little too extreme. Does the voltage (120V needed) of your outlet have much to do with the excess of temperature achieved?
Posted Mon Nov 26, 2007, 1:34pm Subject: Re: Adjusting Water Temps on BUNN VP17/Commercial
A warming warning to all those looking to "trick-out" the machine by pulling up the control thermometer: do not remove the rubber cap holding the thermo in place and pour water into the tank. It will overflow and leak all over your counter, floor. Only pull it as far as the cap will allow for it to go. As you can tell, I've done some more experimenting and it did just that a while ago.
I'd like to hear more testimonies of people who've wanted to get their tank heat maxed. This applies to anyone with a BUNN commercial...
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