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

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

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

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

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

2.0 BREWER OVERVIEW AND REQUIRED TOOLS (Cont.)

2.2 Key Components (Cont.)

Figure 2-2 - Main Components

Nitropro Mini Service Manual

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

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