Bunn nitron 2 Installation & Operating Manual
INSTALLATION & OPERATING GUIDE
BUNN-O-MATIC CORPORATION
PHONE: (217) 529-6601 FAX: (217) 529-6644
To ensure you have the latest revision of the Operating Manual, or to view the Illustrated Parts
Catalog, Programming Manual, or Service Manual, please visit the Bunn-O-Matic website, at
www.bunn.com. This is absolutely FREE, and the quickest way to obtain the latest catalog and
manual updates. For Technical Service, contact Bunn-O-Matic Corporation at 1-800-286-6070.
54261.0001A 09/17 ©2017 Bunn-O-Matic Corporation
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY
Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows:
1) Airpots, thermal carafes, decanters, GPR servers, iced tea/coffee dispensers, MCR/MCP/MCA single cup brewers, thermal servers and ThermoFresh® servers (mechanical and digital) 1 year parts and 1 year labor.
2) All other equipment - 2 years parts and 1 year labor plus added warranties as specified below:
a) Electronic circuit and/or control boards - parts and labor for 3 years.
b) Compressors on refrigeration equipment - 5 years parts and 1 year labor.
c) Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis - parts and
labor for 4 years or 40,000 pounds of coffee, whichever comes first.
These warranty periods run from the date of installation BUNN warrants that the equipment manufactured by it will be
commercially free of defects in material and workmanship existing at the time of manufacture and appearing within the
applicable warranty period. This warranty does not apply to any equipment, component or part that was not manufactured
by BUNN or that, in BUNN’s judgment, has been affected by misuse, neglect, alteration, improper installation or operation,
improper maintenance or repair, non periodic cleaning and descaling, equipment failures related to poor water quality,
damage or casualty. In addition, the warranty does not apply to replacement of items subject to normal use including but
not limited to user replaceable parts such as seals and gaskets. This warranty is conditioned on the Buyer 1) giving BUNN
prompt notice of any claim to be made under this warranty by telephone at (217) 529-6601 or by writing to Post Office Box
3227, Springfield, Illinois 62708-3227; 2) if requested by BUNN, shipping the defective equipment prepaid to an authorized
BUNN service location; and 3) receiving prior authorization from BUNN that the defective equipment is under warranty.
THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY, WRITTEN OR ORAL, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF EITHER MERCHANTABILITY
OR FITNESS FOR A PARTICULAR PURPOSE. The agents, dealers or employees of BUNN are not authorized to make
modifications to this warranty or to make additional warranties that are binding on BUNN. Accordingly, statements by such
individuals, whether oral or written, do not constitute warranties and should not be relied upon.
If BUNN determines in its sole discretion that the equipment does not conform to the warranty, BUNN, at its exclusive option while the equipment is under warranty, shall either 1) provide at no charge replacement parts and/or labor (during the
applicable parts and labor warranty periods specified above) to repair the defective components, provided that this repair
is done by a BUNN Authorized Service Representative; or 2) shall replace the equipment or refund the purchase price for
the equipment.
THE BUYER’S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE OF THIS
EQUIPMENT, WHETHER DERIVED FROM WARRANTY OR OTHERWISE, SHALL BE LIMITED, AT BUNN’S SOLE OPTION
AS SPECIFIED HEREIN, TO REPAIR, REPLACEMENT OR REFUND.
In no event shall BUNN be liable for any other damage or loss, including, but not limited to, lost profits, lost sales, loss of
use of equipment, claims of Buyer’s customers, cost of capital, cost of down time, cost of substitute equipment, facilities
or services, or any other special, incidental or consequential damages.
392, A Partner You Can Count On, Air Infusion, AutoPOD, AXIOM, BrewLOGIC, BrewMETER, Brew Better Not Bitter, BrewWISE, BrewWIZARD, BUNN Espress, BUNN Family Gourmet, BUNN Gourmet, BUNN Pour-O-Matic, BUNN, BUNN with
the stylized red line, BUNNlink, Bunn-OMatic, Bunn-O-Matic, BUNNserve, BUNNSERVE with the stylized wrench design,
Cool Froth, DBC, Dr. Brew stylized Dr. design, Dual, Easy Pour, EasyClear, EasyGard, FlavorGard, Gourmet Ice, Gourmet
Juice, High Intensity, iMIX, Infusion Series, Intellisteam, My Café, Phase Brew, PowerLogic, Quality Beverage Equipment
Worldwide, Respect Earth, Respect Earth with the stylized leaf and coffee cherry design, Safety-Fresh, savemycoffee.com,
Scale-Pro, Silver Series, Single, Smart Funnel, Smart Hopper, SmartWAVE, Soft Heat, SplashGard, The Mark of Quality in
Beverage Equipment Worldwide, ThermoFresh, Titan, trifecta, TRIFECTA (sylized logo), Velocity Brew, Air Brew, Beverage
Bar Creator, Beverage Profit Calculator, Brew better, not bitter., Build-A-Drink, BUNNSource, Coffee At Its Best, Cyclonic
Heating System, Daypart, Digital Brewer Control, Element, Milk Texturing Fusion, Nothing Brews Like a BUNN, Picture
Prompted Cleaning, Pouring Profits, Signature Series, Sure Tamp, Tea At Its Best, The Horizontal Red Line, Ultra are either
trademarks or registered trademarks of Bunn-O-Matic Corporation. The commercial trifecta® brewer housing configuration is a trademark of Bunn-O-Matic Corporation.
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CONTENTS
Warranty ........................................................................................................................ 2
User Notices .................................................................................................................. 4
North American Requirements ....................................................................................... 5
Plumbing Requirements ................................................................................................ 6
Initial Set-Up .................................................................................................................. 6
Nitrogen Gas Hook Up ................................................................................................... 6
Electrical Requirements ................................................................................................. 7
Product Concentrate Requirements ............................................................................... 7
Set Up Instructions ........................................................................................................ 8
Door Cover Installation ................................................................................................ 10
Plumbing Hookup ........................................................................................................ 11
Initial Fill ...................................................................................................................... 11
Operating Controls ....................................................................................................... 12
Cleaning & Preventive Maintenance ............................................................................. 14
Adjustments & Optional Settings ................................................................................. 16
Loading ........................................................................................................................ 17
Priming ........................................................................................................................ 17
Fault Codes .................................................................................................................. 19
Troubleshooting ........................................................................................................... 20
Coolant Diagram .......................................................................................................... 31
Schematic Wiring Diagram .......................................................................................... 32
INTRODUCTION
The cold draft dispenser and door have been shipped in one complete package (the door is in its own package inside the larger box). To prevent damage, the door should remain in its individual packaging until it is ready
for installation. This package also includes the drip tray and grate, and the tapper handles for mounting onto the
door of the dispenser. Save all packaging so that these items can be returned to Bunn-O-Matic.
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USER NOTICES
Carefully read and follow all notices on the equipment and in this manual. They were written for your protec-
tion. All notices are to be kept in good condition. Replace any unreadable or damaged labels.
As directed in the International Plumbing Code of the
International Code Council and the Food Code
Manual of the Food and Drug Administration (FDA),
this equipment must be installed with adequate
backflow prevention to comply with federal, state
and local codes. For models installed outside the
U.S.A., you must comply with the applicable Plumbing /Sanitation Code for your area.
00656.0001
27442.0000
SET N2 PRESSURE
125 PSIG
00986.0002
CHARGE
Type R134A, Amount 9 oz (255 gm)
Design Pressures:
High 255 psi (17.6 bar) (1.76 MPa)
Low 36 psi (2.5 bar) (0.25 MPa)
33461.0001
41509.0006
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NORTH AMERICAN REQUIREMENTS
• This appliance must be installed in locations where it can be overseen by trained personnel.
• For proper operation, this appliance must be installed where the temperature is between 41°F to 95°F (5°C to
35°C).
• Appliance shall not be tilted more than 10° for safe operation.
• An electrician must provide electrical service as specified in conformance with all local and national codes.
• This appliance must not be cleaned by pressure washer.
• This appliance can be used by persons aged from 18 years and above if they have been given supervision or
instruction concerning use of the appliance in a safe way and if they understand the hazards involved.
• Keep the appliance and its cord out of reach of children aged less than 18 years.
• Appliances can be used by persons 18 years and above with reduced physical, sensory or mental capabilities
or lack of experience and knowledge if they have been given supervision or instruction concerning use of the
appliance in a safe way and understand the hazards involved.
• Children under the age of 18 years should be supervised to ensure they do not play with the appliance.
• If the power cord is ever damaged, it must be replaced by the manufacturer or authorized service personnel
with a special cord available from the manufacturer or its authorized service personnel in order to avoid a hazard.
• Machine must not be immersed for cleaning.
• Cleaning and user maintenance shall not be made by children unless they are older than 18 years and supervised.
• This appliance is intended for commercial use in applications such as:
– staff kitchen areas in shops, offices and other working environments;
– by clients in hotel and motel lobbies and other similar types of environments;
• Access to the service areas permitted by Authorized Service personnel only.
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INITIAL SET-UP
The cold draft dispenser dimensions are 10"W x 28.4"D x 34"H. The dispenser is designed for indoor use only, in ambient temperatures ranging from 50°F to 90°F and 65% relative humidity environments. Avoid locating the machine where it
will be subject to direct sunlight or exposed to other external heat sources. Install the dispenser on a counter that is able to
support 150lbs (68 KG) of weight from the machine. Allow a minimum clearance of 6” at the back and top of the dispenser
for proper air circulation. Leave some space so the dispenser can be moved for cleaning. For optimum performance, do
not let warm air from surrounding machines blow on the dispenser.
PLUMBING REQUIREMENTS
This dispenser must be connected to a FILTERED WATER source with operating pressure between 30 and 90 psi
(0.207 and 0.621 mPa) dynamic. This water source must be capable of producing a minimum flow rate of 2 fluid ounces
(88.7 milliliters) per second. A shut off valve should be installed in the line that will supply the dispenser. If installing a
water filter, it should be installed as close as possible to the inlet of the machine, but downstream of the shut-off valve.
The machine is supplied with a 3/8” (9.52 mm) male barb fitting.
NOTE- At least 18 inches (457 mm) of an FDA approved flexible beverage tubing, such as reinforced braided polyethylene,
before the dispenser will facilitate movement to clean the countertop. BUNN-O-MATIC does not recommend the use of
saddle valves to install the dispenser. The size and shape of the hole(s) made in the supply line(s) by saddle valves may
restrict water flow.
If the water pressure is below 30 psi (dynamic) pressure, a booster pump (P/N 41815.1000) is required at the water
line. When installing a water filter and a booster pump, install the water filter in between the booster pump and the machine.
As directed in the International Plumbing Code of the International Code Council and the Food Code Manual of
the Food and Drug Administration (FDA), this equipment must be installed with adequate backflow prevention
to comply with federal, state and local codes. For models installed outside the U.S.A., you must comply with
the applicable Plumbing /Sanitation Code for your area.
NITROGEN GAS HOOK-UP
An N2 high-pressure tank must also be available prior to installation (customer supplied). There must be sufficient space for the cylinder and should be properly secured with a stand or chain to comply with local safety
codes.
The cold draft dispenser will need to be connected to an external Nitrogen (N2) source. This will require an N2
pressure regulator to be installed at the tank with a gas supply line to the dispenser. The external N2 supply connection is a ¼” MFL located on the back of the machine.
The cold draft dispenser may also need connected to a nitrogen generator. The supply pressure from the generator to the machine should be set to 125 psi.
NOTE - If the customer is supplying their own regulator, the regulator should have a working pressure up to 130
psi. 6-feet of dedicated N2 gas tubing line is required to connect the N2 regulator to the machine. The gas tubing
line must be rated at least 130 psi and requires a ¼” FFL fitting at the end of the line to connect to the machine.
NOTE: For best drink consistency and nitrogen infusion, the nitrogen supply pressure to the machine should be
set to 125 psi and maintain +/-10 psi from the 125 psi pressure set point.
NOTE - To ensure safe N2 operation and compliance with local safety codes, the N2 cylinder must be properly
secured. A strap or chain should be used as a means of properly securing the cylinder.
NOTE - When the supply nitrogen pressure drops below 100 psi, a red light indicator will flash at the top of the
dispenser door.
NOTE - This dispenser is not designed to accept CO2 gas.
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ELECTRICAL REQUIREMENTS
CAUTION: The dispenser must be disconnected from the power source until specified in Electrical Hook-Up.
The 120V rated dispensers have an attached cord set and require a 2-wire, grounded, individual branch circuit rated
120 volts ac, 15 amp, single phase, 60Hz. The receptacle must be within 6 feet of the machine. The mating connector is
NEMA 5-15R.
Refer to the data plate for exact electrical requirements.
ELECTRICAL HOOK-UP
CAUTION: Improper electrical installation will damage electronic components.
1. An electrician must provide electrical service as specified.
2. Using a voltmeter, check the voltage and color coding of each conductor at the electrical source.
3. Confirm that the refrigeration switch near the main control board is in the OFF position.
4. Connect the dispenser to the power source.
5. If plumbing is to be hooked up later, be sure the dispenser is disconnected from the power source. If plumbing has
been hooked up, the dispenser is ready for Initial Fill.
PRODUCT CONCENTRATE REQUIREMENTS
The dispenser works with a range of concentrates. Some dispensers will dispense a range of 4:1 to 12:1 and
some dispensers will dispense a range of 10:1 to 32:1. Comfirm you have the correct dispenser for the concentrate you plan to use.
NOTE - Some concentrates may have different ratio capacities in the dispenser. Ratio capability should be confirmed on concentrates before installation.
Only a few product concentrate suppliers manufacture BIBs that fit directly into our dispenser. If you are
working with BIB concentrates that have a Scholle fitting or are packaged in jugs, we recommend you pour the
concentrate into our refillable containers (P/N 39302.0000).
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SET-UP INSTRUCTIONS
1. After connecting to a filtered water source (see PLUMBING REQUIREMENTS), turn on the water supply to
the dispenser.
2. Connect the Nitrogen source to the dispenser, but DO NOT turn on the Nitrogen supply or open the tank’s
valve until specified.
3. Connect the LED lighting from the door cover to the door. Install the door using the 5 mounting screws
provided. (See DOOR COVER INSTALLATION)
4. Confirm that the dispense switch (located in upper right corner of door when open) is in the OFF position.
5. Connect the switches from the handle set to the wire harness on the door (note right and left connections).
Install the handle set using the two screws on the bottom side of the handles. Snap the plug in the hole on
the door under the handles.
CAUTION: Improper electrical installation will damage electronic components.
• An electrician must provide electrical service as specified.
• Using a voltmeter, check the voltage and color coding of each conductor at the electrical source.
Plug the dispenser into a 120V power source. Set the dispense switch to the ON position.
The water bath will fill automatically when dispenser is provided power and water, program mode OFF and dispense switch ON.
NOTE: There will be a flashing red LED light at the top center of the door’s artwork. This light indicates there is
currently no Nitrogen coming into the dispenser (via a pressure detect switch). This switch will turn On when
pressure reaches <100 psi and turn Off when pressure reaches >115 psi.
Do not open the nitrogen tank valve until instructed to do so.
6. Remove the drip tray and splash panel.
7. Once the water bath is full, turn the water bath pump/compressor switch to ON.
• It will take a full 4 hours to build the ice bank required for optimal dispenser performance. During this
time, some further trickling from the water bath into the drip tray is expected due to expansion caused
by the ice bank formation.
8. Install dispense nozzles and drip tray. The nozzle with the Nitro Stout Insert goes in the LEFT dispense station. The nitro stout insert’s function is to provide back pressure while dispensing Nitro Coffee and aides in
creating the “cascading” or surging effect in the dispensed drink.
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9. Load product into both stations of the dispenser.
Prime each side with product by pulling the tapper
handle until you see finished product flowing from the
dispense nozzle.
10. Dispense a drink at each station and check the Brix
by using the Ratio Dispense Test or the Brix Dispense
Test (see Appendix A).
• The first dial (left-most potentiometer on the
board) will adjust pump speed for the LEFT dispense station. The second dial (second from the
left) will adjust pump speed for the RIGHT dispense station. Best practice is to start with the
pump dial set to 9:00 position.
11. Make adjustments to pump speed to achieve the de-
sired Brix target of the product.
12. Turn on the Nitrogen gas supply by opening the valve
on the tank and setting the tank’s output pressure to
125 psig. For best drink consistency and nitrogen infusion, the nitrogen supply pressure to the machine
should be set to 125 psi and maintain +/- 10 psig from
the 125 psi pressure set point. Verify that the regulator’s output gauge reads 125 psig. If the regulator has
a shut-off valve, move the regulator’s valve handle to
the open position (the handle should be parallel to the
gas supply line).
13. Dispense a drink on the left side dispense station to
prime Nitrogen into the system.
14. Reinstall the splash panel. The dispenser will take be-
tween 4-6 hours to completely build the ice bank.
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DOOR COVER INSTALLATION
1. Install door cover by first plugging the LEDs from
the door into the black connectors with RED/BLACK
wires
3. Connect tapper handle switches to harness in
door. NOTE: Connect left switch to blue wires and
right switch to red wires.
2. Install door cover and secure the door cover using 5 screws provided.
4. Slide tapper handle into door assembly.
5. Mount tapper handles through bottom of door as
shown using the screws provided.
6. Install black hole cover as shown.
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