Hobart CNA, CNA-E, CNA-S, CNA-C, CNA-L Service Manual

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.

Issue: 2005-04

SERVICE MANUAL

CONVEYOR RACK TYPE DISHWASHER

CNA

PRESSURE BOOSTER SYSTEM / EPROM rev. 3.00

Important Note

For filling and first run the technician need this manuals, and he must follow the instructions to prevent damage of the booster heating elements

Page 2 – CNA Series (rev. 3.00) © HOBART GmbH, Service Training Center

SERVICE TRAINING CENTER

CONTENTS

CNA MODULES ................................................................................................................................... 3

TECHNICAL DATA ............................................................................................................................... 4

MACHINE DOCUMENTS ..................................................................................................................... 4

CONTROLS .......................................................................................................................................... 5

INITIAL OPERATION ........................................................................................................................... 6

WATER CIRCULATION AND HEAT BALANCE .................................................................................. 7

FUNCTIONAL DESCRIPTION ............................................................................................................. 8

OPERATION .................................................................................................................................... 8

TANK FILL ....................................................................................................................................... 8

BOOSTER ....................................................................................................................................... 8

WASH OPERATION ........................................................................................................................ 8

AUTOTIMER .................................................................................................................................... 9

DRAINING ..................................................................................................................................... 10

SAFETY CIRCUIT ......................................................................................................................... 11

DOOR SWITCH ............................................................................................................................. 11

FLOAT SWITCHES ........................................................................................................................ 11

TEMPERATURE SENSORS .......................................................................................................... 11

WASH SYSTEM ................................................................................................................................. 12

WASH PUMPS .............................................................................................................................. 12

WASH ARMS ................................................................................................................................. 13

LATERAL WASH (OPTION)........................................................................................................... 14

E-PREWASH ................................................................................................................................. 14

RINSE SYSTEM ................................................................................................................................. 15

FINAL RINSE ................................................................................................................................. 15

PRE-RINSE SYSTEM ......................................................................................................................... 16

DUAL RINSE.................................................................................................................................. 16

TRIPLE RINSE .............................................................................................................................. 17

RINSE PUMPS ................................................................................................................................... 18

TANK AND BOOSTER HEATING ...................................................................................................... 18

ELECTRICAL HEATING ................................................................................................................ 18

HEAT RECOVERY .............................................................................................................................. 19

DISPENSERS ..................................................................................................................................... 19

CONTROL PANEL ............................................................................................................................. 19

CONVEYOR SYSTEM ........................................................................................................................ 20

MACHINE CAPACITY .................................................................................................................... 20

TABLE END SWITCH .................................................................................................................... 20

CONVEYOR SAFETY MECHANISM ............................................................................................. 20

TRANSPORT SYSTEM ................................................................................................................. 20

REPLACEMENT OF GEAR MOTOR ............................................................................................. 20

POSITION OF CURTAINS .................................................................................................................. 21

FAULT DISPLAY................................................................................................................................. 22

STARTING FROM EPROM REVISION 3.00.................................................................................. 22

UP TO EPROM REVISION 2.00 (FOR INFO) .............................................................................. 23

SERVICE TRAINING CENTER

CNA MODULES

790

391

2.150

1.950

1.576

1.718

2.600

2.850

1.576

1.718

1.576

1.718

1.576

1.718

1.350

430

2.375 300

1.025

2.675

1.025300

1.325

2.208

1.718

500

303

300

850 900

2.013

CNA CNA-E

CNA-L

CNA-C

CDS CDC

CNA-S

Page 4 – CNA Series (rev. 3.00) © HOBART GmbH, Service Training Center

SERVICE TRAINING CENTER

TECHNICAL DATA

MODEL CNA CNA-E CNA-L CNA-S CNA-C

Capacity (racks - plates / hour)

standard 120 - 2160 150 - 2700 180 - 3240 220 - 3960 180 - 3240

accordant DIN0510 80 100 120 150 120

Prewash

Pump load (kW) – 0.3 1.1 1.5 1.1

Delivery rate (l/min) – 250 740 1020 740

Tank volume (l) – 30 54 100 54

Wash

Pump load (kW) 1.5 1.5 1.5 1.5 1.5

Delivery rate (l/min) 1020 1020 1020 1020 1020

Tank volume (l) 100 100 100 100 100

Rinse

Water consumption (l / hour) 260 260 260 260 260

Dryer

Heating (kW) 4.5 / 9 4.5 / 9 4.5 / 9 4.5 / 9 4.5 / 9

Air circulation (m-/h) 1800 1800 1800 1800 1800

Fan motor (kW) 0.42 0.42 0.42 0.42 0.42

Equipment

2 speeds yes yes yes yes yes

Auto-timer Option Option Option Option Option

Isolating switch Option Option Option Option Option

Dual rinse yes yes yes yes yes

Tr iple rinse Option Option Option Option Option

Heat recovery C30 Option Option Option Option Option

Heat pump CHP18 Option Option Option Option Option

MACHINE DOCUMENTS

Wiring diagrams and general machine data are stored in a pocket at the rear of the hinged electric box.

SERVICE TRAINING CENTER

1. Machine ON / OFF Pushing this button switches the dishwasher on or off. NOTE: After switch off, the machine is not voltage free! At the temperature indicator Rinse appears a point.

2. Start / Stop button – Conveyor / Wash

Pushing this button starts the conveyor with the selected speed. The button illuminates to indicate the mode of the machine:

RED =machine fills and starts heating GREEN =machine is ready for operation BLUE =washing on

When the button flashes:

RED = when switching on the machine: machine is filled but heating-up

fault: the temperature indicators display a code

GREEN =machine refills and heats up BLUE = program started, but machine is not ready for operation

3. Conveyor speed button By pushing this button, it is possible to select between two pre-set conveyor

speeds. The selected speed will be indicated.

By pushing this button for approx. 4 seconds, temperatures will be indicated. "Ch0" = rinse / "Ch1" = wash "Ch2" = prewash (option – activated by S03 in configuration mode)

The temperatures will be displayed one after the other by repeated pushing the Conveyor speed button.

The indicators go out 10 seconds after releasing the button.

4. Conveyor speed indicator Indicates the selected speed.

= slow = fast

When the conveyor speed indicator flashes, the table end switch is activated [1S6].

5. Temperature indicators Indicates the current temperature:

Temperature indicator Rinse (°C)

Temperature indicator Wash (°C)

With a machine malfunction, the temperature indicators display a code.

6. Drain button By pushing this button for approx. 2 seconds, only the prewash tank will be drained. The drain button illuminates and the Start / Stop button illuminates red. After a pre-set time (C04) drain cycle stops and the machine will be refilled automatically.

To drain the machine completely, push drain button for approx. 4 seconds. The drain valves will be controlled via adjustable time delay [C05]. The Drain button illuminates and the Start / Stop button switches off.

CONTROLS

5 Emergency Stop

(option)

231 46

Page 6 – CNA Series (rev. 3.00) © HOBART GmbH, Service Training Center

SERVICE TRAINING CENTER

INITIAL OPERATION

FILLING THE RINSE BOOSTER FOR THE FIRST TIME

This is necessary after setting the machine type, when the dishwasher has been initially installed or when the booster has been drained (to prevent frost damage or to replace heating elements for instance).

– Remove lower front panel and switch on all circuit breakers and motor protection switches in the control box. – Open shut-off valves at site and switch on main switch.

When switching on the machine, the temperature indicator displays flashing:

This indicates that the booster is empty and requires filling.

For the initial fill of pressure booster, the rinse pump has to be energised. This can be carried out via the test mode after the break tank is filled (via mechanically operated float valve):

Switch off the machine by pushing the ON/OFF button

and open the doors.

Push and hold the drain, conveyor speed and Start / Stop button together.

The temperature indicators display:

S01S01

S01

corresponds to the first tested

input (doors) of the control board.

Close the doors. The wash temperature display changes to

--1--1

--1

Generally the switch settings are displayd with

--1--1

--1

when activated (close) and

--0--0

--0

when inactive (open).

Push the Conveyor speed button repeatedly until the temperature indicator rinse displays "

A17A17

A17

(output rinse pump). Push the start button

(

--1--1

--1

appears in the wash temperature display) and hold until water sprays

out of rinse nozzles.

Switch off main switch.

Remove electr. control cover and put the provided jumper on X2 (16/17).

Put the control cover and front panel in place.

Switch on main switch but not the machine.

Open doors, push the drain and conveyor speed button together.

The temperature indicators display:

To clear the message, push the start button . The temperature indicators display:

The wash temperature display will change immediately to

--0--0

--0

Close the doors. The indicators go out and the machine is now ready for operation.

NOTE: After setting the machine type or reset of the parameter C28 to "0",

BOFBOF

BOF

will also be indicated and

the initial booster fill has to be repeated.

SERVICE TRAINING CENTER

WATER CIRCULATION AND HEAT BALANCE

ca. 60°C

3 g/l

1.5 g/l

ca. 10°C

> 45°C

blocking

1S5

auto-timer

1S1

ca. 55-60°C

ca. 45°C

ca. 70°C

900l/h

1B6

1Y11

3Y1

2B2

30°C

600 m

2Y1

1Y2

1B2

1S6

table end switch

ca.85°C 260l/h

rinse agent dosage ca. 0.5 g/l

CNA-S-CDS with triple-rinse

SERVICE TRAINING CENTER

FUNCTIONAL DESCRIPTION

OPERATION

When the machine is switched off, a luminous red point (at the rinse temperature display) indicates that the machine is connected to the main power supply.

Switching on the machine:

Note: When switching on the machine, a test program of the control (inputs and outputs) will run and the control panel is locked during this time. Therefore you should wait approx. 5 sec., before commands are given via control panel.

When the doors are closed and the machine is switched on by pushing the ON/OFF button

, fill will be started.

TANK FILL Via separate fill valve (hot water connention) [S18 = 1]

The machine will be filled by the cascade principle via warm water valve 1Y2. When all float switches [1B2 & 2B2] of the machine are activated, the heatings in the respective tanks will be switched on. Then the machine will be overfilled via adjustable time [C02] (see service mode). Refill during operation is controlled via timer [C03].

The conveyor start button illuminates red

during the fill and heating phase and will change to green light

when all operation temperatures (adjustable) are reached.

Via booster: machines with 1 cold water connection [S18 = 0]:

When the machine is switched on, first the booster will be heated [1K1]. If 70°C [F01] are reached, the rinse pump 1M3 will start and the tanks will be filled via the rinse pipes.

Machine fill via booster can be temperature-controlled by parameter [S14 = 1]. In this case the booster will be heated up to 70°C before the rinse pump 1M3 will be started to fill the machine. If the temperature drops below 48°C, fill (rinse pump) will be stopped until the booster has reached 70°C again.

Fill time control

The fill time of the machine will be controlled via adjustable time [C09] (base value = 30 min). When the respective float switch has not close after this time period, the error message FIL 002 will be displayed. The fault will be cleared as soon as the float switch closes again. The filling of the machine remains activated when the failure occurs.

NOTE: The exhaust ventilator will also be controlled during the whole fill time.

BOOSTER

When the machine is switched on, the pressure pump will be started for approx. 5 sec. [C17] to guarantee refilling of the pressure booster in case of water loss (e. g. evaporation or leakage during a longer standstill period).

During the machine tanks are filled, the booster will be heated up to 70°C [F01]. When the tanks are filled ( after time delay [C02] ), the booster will be heated up to 85°C ( set value [F02] ).

WASH OPERATION

When the machine is ready for operation, the conveyor can be started by pressing the conveyor start button

. The conveyor speed (slow / fast) will be selected by pressing the conveyor speed button and indicated by the LED.

Note: The conveyor can only be started when the machine is filled (re-fill completed) and the set value of 85°C is reached in the booster.

+ 18 hidden pages

Hobart CNA, CNA-E, CNA-S, CNA-C, CNA-L Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual