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Hobart CNA Service Manual

Hobart CNA
27 pages
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SERVICE TRAINING CENTER
This document is destined for internal use only.
The discribed settings and servicing must be carried out by
service technicians qualified by HOBART.
Reproduction of this document is prohibited without the written
permission of Hobart GmbH.
© HOBART GmbH, Service Training Center
Issue: 2005-04
SERVICE MANUAL
CONVEYOR RACK TYPE DISHWASHER
CNA
PRESSURE BOOSTER SYSTEM / EPROM rev. 3.00
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Hobart CNA Specifications

General IconGeneral
Booster HeaterOptional
Water Temperature140-160°F
DimensionsVaries by model
Voltage208-240V
Power RequirementsVaries by model
WeightVaries by model
Wash Temperature140-160°F
Rinse Temperature180-195°F

Summary

CNA Module Dimensions

CNA Model Specifications

Technical drawings detailing the dimensions and configurations of various CNA dishwasher models.

Technical Data and Machine Documents

Model-Specific Technical Data

A table listing performance data, capacity, and features for each CNA model.

Machine Documentation Storage

Information on the location of wiring diagrams and general machine data within the unit.

Control Panel and Indicators

Control Button Functions

Detailed explanation of the operation and illumination of control buttons like ON/OFF, Start/Stop, and Drain.

Status Indicators Explained

Interpretation of temperature indicators and conveyor speed indicators for machine status feedback.

Initial Machine Setup Procedure

Rinse Booster First-Time Filling

Step-by-step guide for the initial filling of the rinse booster to ensure proper function and prevent damage.

Water Circulation and Heat Balance

Functional Description

General Machine Operation

Overview of machine power connection, start-up, and initial fill process.

Booster and Tank Filling Procedures

Details on filling the booster and wash tanks, including water heating and control.

Initiating the Wash Cycle

How to start the conveyor and wash after the machine is filled and temperatures are met.

Functional Description - Timing and Conveyor Control

Autotimer System Functionality

Explains the autotimer's role in managing wash cycles based on rack detection and conveyor speed.

Rinse Cycle Timing Logic

Describes how pre-rinse and final rinse periods are timed according to conveyor speed and rack presence.

Functional Description - Draining and Automation

Machine Draining Operations

Step-by-step procedures for partial and complete draining, including button commands and valve control.

Automatic Conveyor Stop Mechanism

Details the automatic stopping of the conveyor after a set time post-wash cycle completion.

Functional Description - Safety and Sensors

Safety Circuit Components and Function

How the safety circuit monitors doors, conveyor, and motors to ensure safe operation.

Door and Float Switch Operations

Explains the function of door reed switches and float switches in controlling machine operations and tank levels.

Temperature Sensor Specifications

Information on NTC temperature sensors, their resistance values, and troubleshooting methods.

Wash System - Pumps

Wash Pump Performance Data

Specifications for wash pumps, including load, delivery rate, and tank volumes for different models.

Wash Pump Shaft Seal Replacement

A guide for replacing the mechanical shaft seal on wash pumps.

Wash System - Arms and Diaphragms

Wash Arm Configurations and Nozzles

Description of wash arm pipe counts, nozzle arrangements, and their impact on washing.

Diaphragm Function in Wash Arms

Explains diaphragm role in pressure distribution for effective washing on upper and lower arms.

Wash System - Optional Features

Lateral Wash System Details

Information on the optional lateral wash system, its nozzles, and placement for optimal cleaning.

E-Prewash System Configuration

Overview of the E-prewash system, its tank, wash arms, and pump specifications.

Rinse System Overview

Final Rinse Stage Functionality

Details the final rinse process, its importance for hygiene, temperature, and water flow control.

Pre-Rinse System Variants

Dual Rinse System Operation

Explains the dual rinse setup, using final rinse water for pre-rinse and its draining.

Triple Rinse System Process

Describes the triple rinse method for removing residual detergent and regenerating water.

Rinse Pumps and Heating Systems

Rinse Pump Specifications and Rates

Lists part numbers, impeller diameters, and delivery rates for rinse and pre-wash pumps.

Tank and Booster Heating Methods

Explains heating methods for tanks and boosters, noting prewash tanks rely on regeneration.

Electrical Heating and Heat Recovery

Electrical Heating Element Design

Details construction of tank heating elements, internal fuses, and correct installation orientation.

Heat Recovery System Functionality

Explains how exhaust air heats rinse water via exchangers, specifying air volume and temperature impact.

Dispensers and Control Panel Identification

Detergent and Rinse Agent Dosing Guidelines

Guidelines for dispenser installation, connection terminals, and load limits for chemical dosing.

Control Panel Component Part Numbers

Lists part numbers for key control panel components, aiding in identification and replacement.

Conveyor System Mechanics and Safety

Conveyor Speed and Capacity Ratings

Table showing machine capacity and gear specs for CNA models at different conveyor speeds.

Transport System Operation Mechanism

Describes the mechanical system moving racks via gear motor, disc, and rail linkage.

Gear Motor Safety Trip Switch

Details the safety mechanism activated by gear motor jamming, stopping the machine via a trip switch.

Curtain Placement Guidelines

Curtain Dimensions and Types

Illustrations and part numbers for various curtains, hooks, and rods used in different machine modules.

Module-Specific Curtain Layouts

Diagrams showing correct curtain installation for prewash (C, E, L, S) and wash (AR) modules.

Fault Display - EPROM Revision 3.00

Error Codes and Troubleshooting Steps

Comprehensive fault code list, descriptions, and probable causes for EPROM Rev. 3.00 systems.

HEATPUMP System Faults and Clearing

Specific fault codes and clearing procedures for the HEATPUMP option, including pressure-related errors.

Fault Display - EPROM Revisions up to 2.00

Legacy Error Code Information

Information on fault codes and troubleshooting for older EPROM revisions (up to 2.00) for reference.

Clearing Older System Faults

Instructions on how to clear fault messages for machines running EPROM revisions prior to 3.00.

User Notes Section

Blank Notes Grid Area

An empty grid provided for users to record observations, maintenance logs, or important information.

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