Bunn Coffeemaker GRX B User Manual

Use and Care Manual  
Nothing  
brews like a  
BUNN.  
For use with BX-B, BX-W, GRX-B, GRX-W.  
Welcome  
Thank you for purchasing a BUNN home brewer. BUNN home brewers  
are uniquely designed to do exactly what BUNN commercial brewers  
do: give you great-tasting coffee – quickly, simply and consistently.  
Table of Contents  
Important Safeguards........................................................................................................2  
General Information...........................................................................................................3  
Hot Water...........................................................................................................................3  
Initial Set Up Guide............................................................................................................4  
Brewing Perfect Coffee......................................................................................................5  
Better Brewing................................................................................................................6-7  
Cleaning and Maintenance.............................................................................................8-9  
Draining the Brewer.........................................................................................................10  
Authorized Service ..........................................................................................................10  
Accessories.....................................................................................................................10  
Troubleshooting...............................................................................................................11  
Limited Warranty..............................................................................................................12  
Keep this booklet  
for future reference  
WARNING  
RISK OF FIRE OR  
ELECTRICAL SHOCK  
Record these numbers from the bottom of  
your brewer before filling the brewer with  
water:  
WARNING, TO REDUCE THE RISK OF FIRE  
OR ELECTRIC SHOCK  
DO NOT DISASSEMBLE THE BREWER  
NO USER-SERVICEABLE PARTS INSIDE  
MODEL:__________________________  
REPAIR SHOULD BE DONE BY  
AUTHORIZED SERVICE PERSONNEL ONLY  
DATE CODE:______________________  
This symbol alerts you  
to important operating  
and service instructions.  
This symbol alerts you to  
the risk of fire or electrical  
shock in the accompanying  
message.  
1
IMPORTANT SAFEGUARDS  
Follow these basic safety precautions when using electrical appliances to reduce the risk  
of fire, electric shock, and/or personal injury:  
Read all instructions.  
Do not touch hot surfaces. Use handles.  
Do not place cord, plugs, or brewer in water or liquid.  
Close supervision is necessary when the brewer is used by or near children.  
Unplug from outlet when not in use for extended periods of time and before cleaning.  
Allow to cool before putting on or taking off parts, and before cleaning.  
Do not operate the brewer with a damaged cord or plug or if the brewer malfunctions  
or is damaged in any manner. Return the brewer to an Authorized Service Facility for  
examination, adjustment, or repair. (Refer to page 10.)  
Using an accessory not evaluated for use with this brewer may cause injuries.  
For household use only. Do not use outdoors.  
Do not let cord hang over edge of table or counter or touch hot surfaces.  
Do not place the brewer on or near a hot gas or electric burner or in a heated oven.  
Do not use brewer for any other purpose than its intended use.  
Do not place or remove funnel or decanter while brewing.  
Do not use the decanter on a range top or in a microwave.  
Do not set a hot decanter on a cold surface.  
Do not use a cracked decanter or a decanter with a loose or weakened handle.  
Do not pour liquids into the water tank other than water or vinegar solution for  
cleaning, as specified in this manual.  
Do not clean decanter with cleansers, steel wool pads, or other abrasive materials.  
When the brewer is idle, the lid should be in the closed position.  
SAVETHESE INSTRUCTIONS  
A short power-supply cord is used to reduce the risks resulting from becoming entangled  
in or tripping over a longer cord.  
If an extension cord is used, the marked electrical rating of the extension cord should  
be at least as great as the electrical rating of the brewer.The cord should be arranged  
so that it will not hang over the edge of table or counter where it can be pulled on by  
children or tripped over.  
The extension cord must be a three-wire cord of the three-pronged, three-socketed,  
grounding type (including grounding conductor).  
2
GENERAL INFORMATION  
Improper set up will result in permanent damage and void the limited warranty.  
Read and follow the initial set up instructions on page 4.  
This brewer is designed to remain plugged in at all times, except during initial set up or  
when cleaning.  
• A vacation switch is provided on the lower side to completely shut off all electrical  
components when your plans take you away from home for three or more days. Safety  
features that are designed into the BUNN coffee brewer make the daily use of this  
switch unnecessary.  
• If the brewer has been shut off or unplugged for an extended period of time, fill the  
tank with water and allow the water in the tank to heat to the proper temperature  
before using (about 15 minutes or until the heating sound stops).  
Your BUNN coffee brewer has a specially designed tank to keep the water at the  
proper temperature.This constant supply of hot water assures correctly brewed coffee  
in less than three minutes.  
(BTX models) The brewed coffee flows into an unheated thermal carafe.The double  
wall stainless steel construction will hold coffee at serving temperature for about two  
hours at maximum flavor. Pre-heating with hot water will increase the time your coffee  
stays warm.  
(GRX,BX and NHBX models)The brewed coffee flows into a glass decanter where it is  
kept at serving temperature on the porcelain decanter warmer.The warmer is controlled by  
the lighted on/off switch on the front of the brewer.  
NOTE: The warmer switch controls only the decanter warmer.  
The decanter lid reduces coffee evaporation and temperature loss.  
While coffee is being brewed, the newest water in the tank is heated to the proper  
temperature and held until needed.  
When the brewer is not in operation, the lid should be closed. If the lid is left open,  
water could drip from the sprayhead when cold water is poured in.  
Use CAUTION when dispensing hot water from the brewer.The water is approximately  
50°F (10°C) hotter than what’s available from your hot water faucet and is always  
available for other uses.  
The sprayhead may periodically become loose. Using extreme caution since it may be  
hot, retighten the sprayhead with your fingertips.  
NOTE: A severe burn may result if the sprayhead becomes loose and falls off while the  
coffee is brewing.  
HOTWATER  
Get hot water anytime. Just leave out the paper filter and  
coffee from the brew funnel.With funnel in place, pour cold  
water into brewer and in just minutes you will have hot water.  
3
Initial Set Up Guide  
IMPORTANT:  
Brewer is NOT ready to plug in until you have followed  
the steps below. Do NOT plug in brewer until step #5.  
BTX/BX/GRX  
NHBX  
1. Slide empty funnel into funnel guides  
as shown.  
N
UN  
M
B
ER  
AR  
O
W
ON  
2. Fill decanter with cold water. Swivel  
or lift brewer lid and pour water into  
brewer. Position decanter on base  
below funnel. Close the lid and wait  
three minutes while the internal tank  
partially fills.  
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B
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1
8
6
4
3. Open the lid. Remove decanter and  
fill with cold water again. Pour water  
into brewer. Position decanter on base  
under funnel and close the lid.  
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1
8
6
4
4. Wait until water flows from the funnel.  
When water flow stops, pour out  
any water that has collected in the  
decanter. Replace decanter on brewer  
below the funnel.  
10  
8
6
4
B
U
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5. Now, plug in the brewer.  
6. Press the bottom of the vacation switch,  
located on the side of the brewer, to turn  
unit on (Press I to turn on and press O  
to turn off.)Wait 15 minutes for the water  
in the tank to heat.  
O
F
F
O
See steps on page 5 for brewing perfect coffee.  
4
Brewing Perfect Coffee  
See page 4 for initial set up before brewing  
the first time.  
NHBX  
BTX/BX/GRX  
1. Insert BUNN coffee filter into the  
brew funnel.  
2. Measure fresh coffee into the filter and  
shake gently to level the bed of grounds.  
We recommend 1 heapingTbsp.  
(14.2 g) of drip grind per cup of coffee.  
3. Slide the brew funnel into funnel  
guides and open lid.  
N
UN  
M
B
ER  
AR  
O
W
ON  
4. Pour in cold water;minimum 4 cups  
(591.5 ml / 20 oz), up to maximum 10  
cups (1478.7 ml / 50 oz)  
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B
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6
4
5. Position decanter in place on base  
under funnel of brewer. With BTX,  
pre-heat carafe with hot water.  
1
0
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6
4
B
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6. Turn on the warmer not applicable  
with BTXThermoFresh brewer.  
7. Close the lid to start the flow of water  
into the tank.  
8. When brewing has stopped, remove the  
brew funnel and discard the filter and  
grounds. Do not touch hot grounds.  
WARNING: After pouring in water, do not close the lid without the funnel and decanter in  
place. Closing the lid releases the hot water.  
To pre-heat the thermal carafe, fill with hot water for approximately  
30 seconds. Empty before brewing coffee into carafe.  
BUNN filters are unique. Made with a special grade of paper and  
oxygen processed for best coffee flavor, our filters are designed for  
strength, so the sides are taller and you don’t end up with overflow  
and grounds in your coffee.  
5
Better Brewing  
BUNN home brewers are made to do exactly what BUNN commercial brewers do:  
produce great tasting coffee - quickly, simply and consistently. Cup after flavorful cup,  
year after year, nothing brews like a BUNN.  
The Patented BUNN Brewing Difference  
Perfect coffee flavor is robust without bitterness and is determined by three elements:  
water temperature, the time ground coffee is exposed to the water and how much of the  
coffee is exposed to the water.  
TEMPERATURE  
The patented ready-to-brew reservoir keeps water at the ideal brewing  
temperature of approximately 200°F (93.3°C).  
TIME  
The fast 3-minute cycle is the perfect brew cycle time for the most coffee  
flavor without bitterness. Brew cycles that expose ground coffee for more  
than 6 minutes cause an overextracted, bitter taste.  
TURBULENCE  
The unique sprayhead design creates the right amount of turbulence to  
suspend ground coffee and extract flavor evenly and thoroughly.  
With most coffee makers, water drips straight through without evenly  
exposing all coffee granules to the water.  
Use of decaffeinated, fine grind coffee and/or softened water may cause  
an overflow of grounds into your decanter.Visit www.bunn.com or call  
BUNN Customer Service at 800-263-2256 to order a flow restrictor  
sprayhead free of charge.  
For the best cup of coffee, grind fresh beans just before brewing.Adjust  
the amount of coffee to suit your individual taste.  
6
BUNN recommends you DO:  
Keep coffee stored in a clean, dry place away from heat registers and vents or  
extreme cold for maximum freshness.  
Use enough coffee (one heaping tablespoon per cup or about 1½ inches (3.8 cm) of  
coffee in a flat-bottom filter.)  
Use a thermal carafe if you plan to hold coffee more than 20-30 minutes. Coffee  
can be held in a glass decanter for up to 30 minutes or a thermal carafe for about  
two hours.  
Make sure to clean your decanter every day.  
Pre-heat the thermal carafe with hot water for best results.  
Use only BUNN paper filters for proper fit and function. Using a shorter filter may  
result in overflow.  
Dispose of filter and grounds immediately after brewing to prevent drip-through of  
unwanted flavors trapped in used coffee grounds.  
Clean your BUNN brewer with mild, dish soap and water at least once a week,  
especially the sprayhead area. (Do not use any soap or cleaner with citrus added).  
Fresh, good-tasting water is essential for a perfect cup of coffee.  
After all, over 98% of the beverage is water. If your water contains  
excessive amounts of sediment, taste or odors, we recommend  
installing a water conditioner and requesting a flow restrictor  
sprayhead.  
Your BUNN brewer is designed to remain plugged in at all times,  
except during initial set up, when cleaning or if it will not be in use for  
three or more days.  
BUNN recommends you AVOID:  
Mixing fresh brewed coffee with previously brewed coffee.  
Brewing over previously used coffee grounds - all the flavor has already been  
completely extracted.  
Re-heating for serving any coffee with a temperature below 175°F (80°C)  
Serving coffee brewed with beans or ground coffee past the freshness date.  
Letting coffee “bake” on a brewer warmer.Twenty to 30 minutes is the maximum  
time allowable for an open decanter to deliver a perfect cup of coffee.  
Serving coffee in decanters that haven’t been properly cleaned, since acids and  
other organic materials can taint even the best coffee.  
7
CLEANING INSTRUCTIONS  
Daily washing and cleaning of the brew funnel and decanter after each use is required.  
Occasionally, wipe the outside of the brewer, including the area above the funnel, with  
mild, no citrus added dish soap and a damp cloth.The brew funnel and decanter are top  
rack dishwasher safe. Please see page 9 for instructions on cleaning your thermal carafe.  
DELIMING  
You should delime your BUNN brewer to clear any deposits that may have accumulated  
due to impurities in the water source.The frequency of deliming depends on the mineral  
content of your water.  
NOTE - Unplug the brewer and let it cool down before deliming.  
1. Remove the sprayhead by turning with your fingertips and set it aside.  
2. Insert all but 5.1 cm (2 inches) of the flexible deliming tool (supplied) into the  
deliming tool.  
3. Slide the tool in and out five or six times to loosen lime in the sprayhead tube.You  
may need to twist, push and use some force when inserting the tool, then remove.  
4. Prior to replacing sprayhead, pour one decanter of fresh water into the brewer.  
Position empty decanter on the brewer and close the lid.Water will flow into decanter.  
5. Check the holes of the sprayhead. If plugged with mineral deposits or white flakes,  
they may be cleared by using a toothpick. Clean the sprayhead with a cloth and mild  
detergent. Rinse the sprayhead with water, then reinstall. Empty water from decanter.  
6. Plug in the brewer and allow the water in the tank to reheat before using  
(approximately 15 minutes).  
PERIODIC CLEANING  
You should clean your BUNN brewer at least every 3 months.The frequency of cleaning  
depends on the mineral content of your water.  
1. Slide an empty brew funnel into the brewer under the sprayhead and center an empty  
decanter on the base plate.  
2. Open the lid and pour one quart of white vinegar into the top of the brewer; close the  
lid. Empty the decanter when liquid stops flowing from the funnel.  
3. Allow the brewer to sit plugged in for two hours.  
4. Unplug the brewer. Remove the brew funnel and sprayhead from the brewer. Clean  
the sprayhead with a cloth and mild detergent.  
5. To drain the brewer, continue to Step 6, OR to clear vinegar out of brewer without  
draining, pour a decanter of fresh, cold water through the brewer.With funnel in  
place, position decanter on base plate, then close the lid to allow the water to run  
through the brewer. After it has run through, empty decanter and repeat the process  
approximately 8 - 10 times.  
Proceed to Step 9.  
8
6. Cool the brewer by pouring a full decanter of fresh, cold water into the top of the  
brewer. Place decanter on the base plate and close the lid.When water has stopped  
flowing from the brewer, empty the decanter. Repeat this process and set the  
decanter aside.  
7. Grasp the back of the brewer and turn it upside down over a sink. Most of the water  
in the tank will flow from the sprayhead tube opening. Some water may flow from the  
area around the top lid. Continue tipping the brewer until the flow stops.  
8. Pour a decanter of water into the top of the brewer. Place the decanter on the base  
plate; close the lid and wait 3 minutes. Repeat this process with another decanter of  
water.Water will flow out of the funnel after the second decanter has been poured in.  
When flow from the funnel has stopped, empty the decanter and pour an additional  
decanter of water into the brewer. Place the decanter on the base plate and close lid.  
9. Replace the sprayhead and funnel. Pour additional decanters of fresh, cold water into  
the brewer as needed until the water has no vinegar taste.  
10. Place decanter on base plate and plug in the brewer. Allow the water in the tank to  
reach brewing temperature before using (approximately 15 minutes).  
While cleaning your brewer, don’t forget to check your glass decanter  
handle.If loose, use a standard screwdriver to tighten.  
FlavorGard valve  
THERMAL CARAFE ROUTINE CLEANING (BTX model)  
The carafe may be disassembled for cleaning. Rotate the lid  
counterclockwise to remove. Occasionally, the FlavorGard valve  
should be removed and cleaned. Lift at the edge and pull up. After  
rinsing, replace by aligning the tab on the FlavorGard valve with the  
slot inside the carafe lid and press in place. Use of a mild, non-abrasive  
detergent is recommended. Do not use a scrub pad or other abrasive cleaning device,  
as this will scratch the stainless steel surface.The brew funnel and carafe are top-rack  
dishwasher safe.  
To remove coffee stains from inside the thermal carafe, place a paper filter in the funnel and  
pour in one teaspoon of Cascade powder dishwasher detergent into the paper filter.Slide  
funnel onto the rails and open brewer lid.Pour one carafe of cold water into brewer.Position  
carafe on base plate of brewer and close lid.When brewing cycle has stopped, remove the  
brew funnel and discard the filter and detergent;rinse funnel thoroughly.Allow carafe to sit for  
10-15 minutes.Using a long handled, soft bristled brush, clean inside of carafe as well as the  
outer rim to remove any coffee stains or debris.Occasionally scrub the carafe pour lip and the  
area around it, including the lid, with a mild detergent and warm water.Use a soft cloth and  
scrub hard.When finished, pour out solution into sink and thoroughly rinse carafe and lid with  
clean water.  
9
DRAININGYOUR BREWER  
The water in your BUNN coffee brewer should be emptied whenever it is taken on a trip,  
shipped, stored in an unheated location with a chance of freezing, or goes unused for a  
extended period of time.To drain your brewer, use the following procudure:  
1. Unplug the brewer. Remove the brew funnel and sprayhead from the brewer and set  
them aside.  
2. Cool the brewer by pouring a full decanter of fresh, cold water into the top of the  
brewer. Place decanter on the base plate and close the lid.When water has stopped  
flowing from the brewer, empty the decanter. Repeat this process and set the  
decanter aside.  
3. Grasp the back of the brewer and carefully turn it upside down over a sink. Most of  
the water in the tank will flow from the sprayhead tube opening. Some water may flow  
from the area around the top lid. Continue tipping the brewer until the flow stops.  
4. Replace the sprayhead and funnel after the water has been drained.  
AUTHORIZED SERVICE  
For Service Information Contact:  
BUNN Corporation Canada, 280 Industrial Parkway S., Aurora, Ontario L4G 3T9, (800) 263-2256  
BUNN Corporation, 1400 Stevenson Drive, Springfield, IL 62703, (800) 352-2866  
BUNN Corporation, 16431 Carmenita Road, Cerritos, California 90701, (800) 637-2866  
BUNN Corporation, 900 E.Townline Rd., Creston, Iowa 50801  
To receive full assistance, please have date code ready when calling for service.  
(Located on the bottom of your brewer, see page 1)  
BUNN Accessories  
BUNN offers a complete line of accessories for  
your BUNN home brewer, including paper filters,  
decanters, thermal carafes, coffee grinders,  
replacement funnels and more.  
Coffee Wipes help remove coffee and other food  
stains.These handy towelettes are great to keep  
in your glove box, purse, briefcase or at home.  
Purchase online.  
800-263-2256.  
10  
Troubleshooting  
Suggestions  
Problem  
• Initial set up required - see page 4.  
Make sure lid is closed.  
Coffee not coming out  
Evaporation can occur over time - reservoir may need to  
be refilled. See initial set up on page 4.  
Requires a minimum of 4 cups (591.5 ml / 20 oz)  
to begin brewing.  
Check sprayhead holes, clean if necessary. See deliming  
instructions (step 5) on page 8.  
Evaporation can occur over time - reservoir may need  
refilled. See initial set up on page 4.  
Brewed only partial  
decanter  
Some water is always absorbed by the coffee grounds  
and filter.You may need to adjust water input  
accordingly.  
Use BUNN paper filters.  
Sprayhead is missing.  
Funnel is overflowing  
Decaffeinated, fine grind coffee or softened water is  
used. See bottom of page 10 to order correct sprayhead  
or paper filters.  
Plug in brewer and turn on vacation switch on side  
of brewer. Allow 15 minutes for water to heat to proper  
temperature.  
Coffee is cold  
Coffee is not staying hot  
Warmer switch should be in theonposition.(BX, GRX,  
NHBX)  
• If using a BTX with thermal carafe, pre-heating will increase  
the time your coffee will stay warm.  
Normal while water is heating.  
Loud rumbling noise  
May be time to delime. Refer to page 8.  
Make sure lid is fully open.  
Brewer is not designed to hold water in upper tray for an  
extended period of time.  
Waterflow begins before lid  
is closed  
Remove top lid to ensure rocker arm is snapped in place  
and rubber stopper area is thoroughly cleaned.  
Refer to deliming instructions (step 3) on page 8.  
Deliming tool doesn’t go in  
all the way  
Brewers or call 800-263-2256.  
Brewer leaks  
11  
LIMITEDWARRANTY  
Bunn-O-Matic warrants the BUNN BX, GRX, BTX and NHBX Coffee Brewers  
(“Brewers”), except glass serving bowl, to be free from defects in material and  
workmanship existing at the time of manufacture and appearing within one of the  
following warranty periods:  
a) Three (3) years from the date of original purchase of a NEW BREWER.  
b) The later of three (3) years from the date of original purchase or one (1) year from  
the date REPAIRED OR REPLACEMENT BREWER is received by the customer  
when returned to Bunn-O-Matic before the new Brewer warranty has expired.  
c) One (1) year from the date REPAIRED OR REPLACEMENT BREWER is received by  
the customer when returned to Bunn-O-Matic after the new Brewer warranty has expired.  
d) One (1) year from the date of purchase of a REMANUFACTURED BREWER.  
If such a defect appears during the warranty period, we will (at our sole option)  
repair or replace the defective Brewer with no charge for service or parts, provided the  
Brewer is delivered at the customer’s expense to one of the authorized service centers  
listed on page 11 of this booklet.  
This warranty does not cover claims resulting from misuse, failure to follow instructions  
on installation and use, use with water having a high mineral content, neglect, use  
of unauthorized attachments, commercial use, use on a current or voltage other  
than specified on the Brewer, or unauthorized service during the warranty period on  
conditions otherwise covered by warranty.  
THIS WARRANTY SHALL BE EXCLUSIVE AND SHALL BE IN LIEU OF ANY  
OTHER EXPRESS WARRANTY, WRITTEN OR ORAL, INCLUDING BUT NOT  
LIMITED TO ANY EXPRESS WARRANTY OF MERCHANTABILITY OR  
FITNESS FOR A PARTICULAR PURPOSE.THE DURATION OF ANY IMPLIED  
WARRANTIES, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTIES OF  
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, IS EXPRESSLY  
LIMITED TO THE PERIOD OF DURATION OF THIS LIMITED WARRANTY.  
Some states do not allow limitations on how long an implied warranty lasts, so the above  
limitation may not apply to you.  
THE CUSTOMER’S EXCLUSIVE REMEDY FOR BREACH OF THIS WARRANTY  
OR OF ANY IMPLIED WARRANTY OR OF ANY OTHER OBLIGATION ARISING  
BY OPERATION OF LAW OR OTHERWISE SHALL BE LIMITED AS SPECIFIED  
HEREIN TO REPAIR OR REPLACEMENT, AT OUR SOLE OPTION. IN ANY EVENT,  
RESPONSIBILITY FOR SPECIAL, INCIDENTAL AND CONSEQUENTIAL DAMAGES IS  
EXPRESSLY EXCLUDED.  
Some states do not allow the exclusion or limitation of incidental or consequential  
damages, so the above limitation or exclusion may not apply to you.  
This warranty gives you specific legal rights, and you may have other rights which vary  
from state to state.  
12  
BUNN Corporation  
1400 Stevenson Drive  
Springfield, IL 62703 USA  
1-800-352-BUNN (2866)  

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