Cornelius NITROPRO MINI User manual

SPECIALTY BEVERAGE DISPENSER
NITROPRO MINI
Service and Preventative Maintenance Manual
Release Date: 2/15/19
Publication Number: 548000106SER
Revision Date: 2/15/19
Revision: Rev. 2.0 Model: CNB Mini
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The products, technical information, and instructions contained in this manual are subject to change without notice. These
instructions are not intended to cover all details or variations of the equipment, nor to provide for every possible contingency
in the installation, operation or maintenance of this equipment. This manual assumes that the person(s) working on the equip‐
ment have been trained and are skilled in working with electrical, plumbing, pneumatic, and mechanical equipment. It is
assumed that appropriate safety precautions are taken and that all local safety and construction requirements are being met,
in addition to the information contained in this manual.
This Product is warranted only as provided in Cornelius’ Commercial Warranty applicable to this Product and is subject to all of
the restrictions and limitations contained in the Commercial Warranty.
Cornelius will not be responsible for any repair, replacement or other service required by or loss or damage resulting from any
of the following occurrences, including but not limited to, (1) other than normal and proper use and normal service conditions
with respect to the Product, (2) improper voltage, (3) inadequate wiring, (4) abuse, (5) accident, (6) alteration, (7) misuse, (8)
neglect, (9) unauthorized repair or the failure to utilize suitably qualified and trained persons to perform service and/or repair
of the Product, (10) improper cleaning, (11) failure to follow installation, operating, cleaning or maintenance instructions, (12)
use of “non‐authorized” parts (i.e., parts that are not 100% compatible with the Product) which use voids the entire warranty,
(13) Product parts in contact with water or the product dispensed which are adversely impacted by changes in liquid scale or
chemical composition.
Contact Information:
To inquire about current revisions of this and other documentation or for assistance with any Cornelius product contact:
www.cornelius.com
800-238-3600
Trademarks and Copyrights:
This document contains proprietary information and it may not be reproduced in any way without permission from Cornelius.
This document contains the original instructions for the unit described.
CORNELIUS INC
101 Regency Drive
Glendale Heights, IL
Tel: + 1 800‐238‐3600
Printed in U.S.A.
Correct Disposal of this Product
RECYCLE
This marking indicates that this product should not be disposed with other household wastes throughout the EU. To prevent
possible harm to the environment or human health from uncontrolled waste disposal, recycle it responsibly to promote the
sustainable reuse of material resources. To return your used device, please use the return and collection systems or contact
the retailer where the product was purchased. They can take this product for environmental safe recycling.

1.0 SAFETY 1
2.0 OVERVIEW AND REQUIRED TOOLS 3
2.1 Nitropro Functions & Specifications 3
2.2 Key Components 4
2.3 Required Tools 6
3.0 SYSTEM OPERATION 7
3.1 Facility Supplies 7
3.2 Operating Processes 8
3.3 Component Functions
3.3.1 Tap Handles 10
3.3.2 Product Concentrate Pump 10
3.3.3 Water Inlet Solenoid 11
3.3.4 Air Compressor & Storage 11
3.3.5 Mixing-Infusion Manifold & Check Valves 11
3.3.6 Dispense Manifold 12
3.3.8 Mixing-Dispensing Assembly 12
3.3.9 Ice Bank Chilling System 13
3.3.10 Front-Door Control Switches 14
4.0 PREVENTATIVE MAINTENANCE 15
4.1 Overview 15
4.2 Maintenance Schedule 15
4.3 Annual Maintenance 15
4.3.1 Refrigeration Condenser & Cabinet Fan Cleaning 15
4.3.2 Ice Bank Level Check 15
4.3.3 Product Pump Mix-Ratio Verification 16
4.3.3.1 Measuring TDS (Total Dissolved Solids) 16
4.3.4 Components Visual Inspection 18
4.3.5 Ice-Bank Sensor & Agitator Check 18
4.3.6 Concentrate-Pump Hose Replacement 19
Table of Contents

5.0 TROUBLESHOOTING 20
Table 5-1 - Systems-Level Troubleshooting 20
Table 5-2 - Drink-Quality Troubleshooting 21
Table 5-3 - Compressed Air & Infusion Troubleshooting 22
Table 5-4 - Dispensing-Function Troubleshooting 23
5.1 Air-Compressor Pressure Verification 24
6.0 COMPONENT REPLACEMENT 25
6.1 Safety Precautions 25
6.3 Access Panel Removal 25
6.3 Main PCB 27
6.4 Mixing-Dispensing Assembly Components 28
6.4.1 Air Pressure Regulator 28
6.4.2 Mixing - Infusion Manifold 29
6.4.3 Dispense Manifold 29
6.4.4 Concentrate Pump 30
6.5 Air Compressor 30
6.5.1 Compressor Air Filter Replacement 30
6.6 Water Inlet Solenoid 31
6.7 Power Supply (24Vdc) 31
6.8 Merchandiser LED Back-Lighting Panel 32
6.9 Ice Bank 32
6.9.1 Ice Sensor Probe 32
6.9.2 Agitator Motor 33
6.9.3 Ice Bank Controller 34
6.9.4 Refrigeration Components 35
6.10 Tap Microswitches 35
APPENDIX A - SYSTEM DRAWINGS 37
Table of Contents

Nitropro Mini Service Manual
© 2019, Cornelius Inc. All Rights Reserved - 1 - Publication Number: 548000106SER
1.0 SAFETY INSTRUCTIONS
Safety Overview
• Read and follow ALL SAFETY INSTRUCTIONS in this manual and any warning/caution labels on the
unit (decals, labels or laminated cards).
• Read and understand ALL applicable OSHA (Occupational Safety and Health Administration) safety
regulations before operating this unit.
Types of Alerts
!
!
DANGER: Indicates an immediate hazardous situation which if not avoided WILL result in
serious injury, death or equipment damage.
!
!
WARNING: Indicates a potentially hazardous situation which, if not avoided, COULD result in
serious injury, death, or equipment damage.
!
!
CAUTION: Indicates a potentially hazardous situation which, if not avoided, MAY result in
minor or moderate injury or equipment damage.
SAFETY TIPS
• Carefully read and follow all safety messages in this manual and safety labels on the unit.
• Keep safety labels in good condition and replace missing or damaged ones.
• Do not let anyone operate the unit without proper training. This appliance is not intended for use
by untrained or unauthorized persons without supervision.
• Maintain the unit in proper working condition and do not allow any unauthorized modifications.
NOTE: The dispenser is not designed for a wash-down environment and MUST NOT be placed in
an area where a water jet could be used.
QUALIFIED SERVICE PERSONNEL

WARNING:
Only trained and certified electrical, plumbing and refrigeration technicians should service this unit.
ALL WIRING AND PLUMBING MUST CONFORM TO NATIONAL AND LOCAL CODES. FAILURE TO COMPLY-
COULD RESULT IN SERIOUS INJURY, DEATH OR EQUIPMENT DAMAGE. IF THE SUPPLY CORD IS DAMAGED,
IT MUST BE REPLACED BY THE MANUFACTURER, ITS SERVICE AGENT OR SIMILARLY QUALIFIED PERSONS
IN ORDER TO AVOID A HAZARD.
!

Nitropro Mini Service Manual
Publication Number: 548000106SER - 2 - © 2019, Cornelius Inc. All Rights Reserved
1.0 SAFETY INSTRUCTIONS (CONT.)
SAFETY PRECAUTIONS
This unit has been specifically designed to provide protection against personal injury. To ensure contin-
ued protection observe the following:

DANGER:
Disconnect power to the unit before servicing while following all lock out/tag out procedures estab-
lished by the user. Verify power is off to the unit before any work is performed.
FAILURE TO DISCONNECT THE POWER COULD RESULT IN SERIOUS INJURY, DEATH OR EQUIPMENT
DAMAGE.

CAUTION:
Always be sure to keep area around the unit clean and free of clutter. Failure to keep this area clean may
result in injury or equipment damage.
DO NOT STORE EXPLOSIVE SUBSTANCES SUCH AS AEROSOL CANS WITH A FLAMMABLE PROPELLANT IN
THIS APPLIANCE.
UNTRAINED AND UNAUTHORIZED INDIVIDUALS SHALL NOT OPERATE THE APPLIANCE OR PERFORM 
ANY CLEANING OR USER-MAINTENANCE PROCEDURES.
SHIPPING AND STORAGE

CAUTION:
Before shipping, storing, or relocating the unit, the unit must be sanitized and all sanitizing solution
must be drained from the system. A freezing ambient environment will cause residual sanitizing solution
or water remaining inside the unit to freeze resulting in damage to internal components.
MOUNTING IN OR ON A COUNTER

DANGER:
When installing the unit in or on a counter top, the counter must be able to support a weight in excess of
140 lbs. (63.5 kg.) to insure adequate support for the unit.
FAILURE TO COMPLY COULD RESULT IN SERIOUS INJURY, DEATH OR EQUIPMENT DAMAGE.
THE APPLIANCE MUST BE ORIENTED IN A VERTICAL POSITION.
!
!
!
!

Nitropro Mini Service Manual
© 2019, Cornelius Inc. All Rights Reserved - 3 - Publication Number: 548000106SER
2.0 OVERVIEW AND REQUIRED TOOLS
2.1 Nitropro Functions & Specifications
The Nitropro Mini dispenses still or air-injected,
chilled Nitro coffee at the pull of a tap handle.
Opening a tap automatically engages the product
mixing pump (as well as the air pump for the
injected-coffee selection). The dispensing unit
requires facility electrical and water inputs; Nitro
infusion gas is generated within the unit.
• Coffee syrup from a product container is auto-
matically mixed with water at the selected
ratio (with mix ratios user-selectable via a DIP
switch on the main control PCB)
• Nitro coffee is created via its dispensing circuit
including a gas-infusion (air-injection) mani-
fold prior to the tap (dispensing) valve
• Metering of the product concentrate is per-
formed by a servo-driven, peristaltic pump
• Water inlet rate is fixed and controlled by an
inlet solenoid valve assembly that also pro-
vides pressure limiting and flow control
• Chilling of the product cabinet and mix water
is performed by an automatically-controlled
ice bank at the base of the enclosure
Table 2-1 - Electrical Specifications
Models VAC Amps Ph Hz
CNB
Mini 115 5 1 60
CNB
Mini 230 2 1 50
Table 2-2 - Refrigerant Type
Refrigerant
Oz Grams Type
5.64 160 R-134a
Table 2-3 - Refrigeration Nameplate Values
Pressure psi (kPa) [ bar]
High
side Low side
315 (2171.9) [21.7 ] 140 (965.3) [9.7]
Table 2-4 - Water Requirements
Water Supply Pressure
35 psig (241 kPa) Min.
90 psig (621 kPa) Max.
(if >90 psi, install external pres-
sure regulator, set @ 50 psi)
Water Supply
Flow Rate
3 fl. oz. (88.7 ml) per
second, minimum
Water Temperature 40 - 90° F. (4.4 - 32.2° C)
Water Inlet Size 3/8 in. (0.95 cm) SAE male flare
fitting on dispenser
Table 2-5 - General | Dimensions | Weight
Unit Height 34.05 in. (86.5 cm)
Unit Width 10.44 in. (26.5 cm)
Unit Depth 24.47 in. (62.2 cm)
Clearance
Requirements
Back: 4” (10.16 cm)
Top: 12” (30.48 cm)
Sides: 4” (10.16 cm)
Unit Weight (Dry) 120 lbs (54.4 kg)
Operating Weight 185 lbs (84.0 kg)
Ambient Operating
Temperature 50 to 90 °F (10 to 32 °C)
Table 2-6 - Ice Bank Specifications
Ice Bank Capacity 7-8 lbs. (3.2-3.6 kg.)
Temp. Pull Down Time 3 hours at 75 °F (24 °C)

Nitropro Mini Service Manual
Publication Number: 548000106SER - 4 - © 2019, Cornelius Inc. All Rights Reserved
2.0 BREWER OVERVIEW AND REQUIRED TOOLS (Cont.)
2.2 Key Components
The Nitropro Mini consists of these main controls
and components (refer to Figs. 2-1 and 2.2).
Dispensing Taps (for Still & Nitro Coffee)
Allow coffee dispensing. Pulling of tap
handle triggers switch that activates outlet
solenoid valve (in dispense manifold); also
turns on water inlet solenoid valve and
concentrate pump to initiate flow.
Ice Bank (Water Reservoir and Refrig. Unit)
Water/ice-filled reservoir for chiller lines.
Includes controller to manage refrigeration
compressor, bath agitator, circulation pump
and temperature/ice sensor.
Air Compressor & Storage Chamber
Provides air to the gas-infusion manifold.
Stores compressed air to support high drink
volumes. The compressor is independent
and is activated by the storage-chamber
pressure switch. Storage outlet routes to a
pressure regulator prior to entering the
infusion manifold.
Concentrate Pump
Meters input of coffee product from BIB
(Bag In Box) to mixing manifold. Peristaltic
pump, servo-motor driven.
Product-Mixing & Gas-Infusion Manifold
Interconnected plastic blocks with check
valves and a mixing chamber for mixing, air-
injecting and routing of coffee concentrate,
water and air to the dispense manifolds.
Three check valves control flow routing by
preventing backflow.
Dispense Manifolds
Tap-handle activated, outlet solenoid valve.
Outlet valve allows product dispensing.
Water-Inlet Solenoid Valve/Regulator
Solenoid valve allows water inlet.
Regulator limits inlet pressure & flow rate.
System Controller Board (Main PCB)
Manages system events and device
interactions. Includes adjustable DIP switch
for concentrate-pump ratio selection. Also
includes PCB switches for fine-tuning the
ratio selection.
24Vdc Power Supply
Provides power to Main PCB and the air
compressor.
Figure 2-1 - Front LED-Backed Merchandiser Removal

Nitropro Mini Service Manual
© 2019, Cornelius Inc. All Rights Reserved - 5 - Publication Number: 548000106SER
2.0 BREWER OVERVIEW AND REQUIRED TOOLS (Cont.)
2.2 Key Components (Cont.)
Figure 2-2 - Main Components

Nitropro Mini Service Manual
Publication Number: 548000106SER - 6 - © 2019, Cornelius Inc. All Rights Reserved
2.0 BREWER OVERVIEW AND REQUIRED TOOLS (Cont.)
2.3 Required Tools
These tools are required for conducting the vari-
ous procedures in this manual. You may find it
helpful to review the Troubleshooting and Com-
ponent Replacement sections to determine what
additional tools you might prefer to include.
HAND TOOLS
Wrenches - SAE Open-end or Combination
(1/4” through 7/8”)
Wrenches - Adjustable
(2” x 6”- 8” Length, Crescent)
Nut Driver Set - SAE
Pliers - Adjustable
Channel-Lock/Knipex-style
Pliers - Needlenose
Flat Screwdriver
3/16”
Phillips Screwdrivers
#2 & #0 (6” Length)
#2 Stubby or Flex-shaft
Diagonal Cutting Pliers
Pick Set - Dental Type
Magnetic Pickup Wand
Cleaning Brushes
Bristle and Wire
Air Pressure Gauge
Capable of 100 psi (689 kPa)
with high-pressure hose and
1/4”push-connect fitting
Hose-Clamp Crimping/Cutting Tool
Oetiker HIP 2800 Es
ELECTRICAL TOOLS
Multimeter - Digital VOM
1000V/10A ac/dc, milliohm to megohm, millivolt,
auto-ranging, ±2.5% +1 digit accuracy
Temperature Meter & Probe
±2.5% +1 digit accuracy
Cordless Drill or Screwdriver
With Screwdriver Bits / Nut Drivers
Flashlight
Portable Vacuum Cleaner
With hose and crevice tool
SUPPLIES
O-Ring Lubricant/Sealant Food-Grade Silicone
Dow Corning Molykote 111 or equiv.
Solvent - Nonflammable
Teflon Thread-sealing Tape
Lint-free Cloth Rags