Dantherm Hex 6 A User manual

Hex 6 A

No. 029951 • rev. 2.0 • 27.09.2005

Der tages forbehold for trykfejl og ændringer

Dantherm can accept no responsibility for possible errors and changes

Irrtümer und Änderungen vorbehalten

Dantherm n’assume aucune responsabilité pour erreurs et modifications éventuelles

Introduction

Overview

Introduction This is the service manual for the Dantherm HEX 6 A unit.

The below table of contents gives an overview of the main sections.

Please refer to the complete table of content for further information about the sections.

Serial number This manual covers units with serial numbers equal or higher than:

xxxxxx0764740

Warning It is the responsibility of the operator to read and understand this service manual

and other information provided and to use the correct operating procedures.

Heat exchangers should only be operated by qualified (trained) personnel and

repair of cooling circuit and/or electrical system done only by skilled service

people. Failure to do so can result in personal injury or equipment damage.

Read the entire manual before the initial start-up of the heat exchanger. It is important

to know the correct operating procedures for the heat exchanger and all safety

precautions to prevent the possibility of property damage and/or personal injury.

Table of contents This service manual covers the following main topics:

Topic See page

Introduction Next page

Product and functional description 5

Service guide 7

Technical information 14

029951 • Version 2.0 • 27.09.2005

General information

Introduction This section gives the general information about this service manual and about the unit.

Manual, part

number

Part number of this service manual is 029951.

Target group The target group for this service manual is the:

•Users of the unit

•Technicians who install and maintain the unit

from Dantherm.

Reservations Dantherm reserves the right to make changes and improvements to the product and the

service manual at any time without prior notice or obligation.

EC-Declaration of

Conformity

Dantherm A/S, Marienlystvej 65, DK-7800 Skive hereby declare that the units

mentioned below:

HEX 6 A – product no. 352926:

is in conformity with the following directives:

98/37/EEC Directive on the safety of machines

73/23/EEC Low Voltage Directive

89/336/EEC EMC Directive

97/23/EEC Pressure Equipment Directive

- and are manufactured in conformity with the following standards:

EN 292 Machine Safety

EN 60 335-1 Low voltage

EN 60 335-2 Low voltage

EN 61 000-2 Immunity

EN 61 000-3 Emission

Skive, 20.09.2005

Product and functional description

Introduction This section gives all necessary information about the product and its functions.

Control system The HEX 6 A is controlled via a controller that controls

the speed of the fans.

The key features of the controller are:

•Temperature sensor

•Set points

•Alarm output

•Power

Part Function

cRS 232 – connector for

•factory testing or

•further information from the controller

dAlarm LED, see page 7

e9 Sub-D power plug – male

f9 Sub-D plug – female – When the plug is removed a test of the

fans can be run. The fans will run maximum speed, when the

plug is removed.

NB: The plug should always be mounted during normal

operation

Temperature

sensor

The temperature sensor is an on board sensor, placed on the controller.

Continued overleaf

029951 • Version 2.0 • 27.09.2005

Product and functional description,

continued

Set points at

increasing

temperatures

The following set points are according to the control strategy when the temperature is

increasing:

Description Internal temperature Fan speed

Internal fan Below 20 °C

20 °C – 30 °C

Between 30 °C – 50 °C

Over 50 °C

Off (0)

Low (1100)

Between low and high (1100-1920)

High (1920)

External fan Below 30 °C

30 °C – 35 °C

Between 35 – 55 °C

Over 55 °C

Off (0)

Low (1100)

Between low and high (1100-1850)

High (1850)

Set points at

decreasing

temperatures

The following set points are according to the control strategy when the temperature is

decreasing:

Description Internal temperature Fan speed

Internal fan Over 50 °C

Between 50 – 30 °C

30 °C – 18 °C

Below 18 °C

High (1920)

Between high and low (1920-1100)

Low (1100)

Off (0)

External fan Over 55 °C

Between 55 – 35 °C

35 °C – 28 °C

Below 28 °C

High (1850)

Between high and low (1850-1100)

Low (1100)

Off (0)

Two separate air

flows

The two airflows (internal/external) are totally separated. The external air is only used to

cool down the internal air via the counter flow recuperator. The air flows are never

mixed.

Internal air flow The warm internal air is sucked from the base station into the internal fan at the top of

the HEX 6 A and let through the recuperator, where it is cooled down.

After the cooling in the recuperator the air is let back into the base station.

External air flow The cold external air is sucked into the external fan at the bottom of the HEX 6 A and

let through the recuperator, where it is cooling down the internal air.

After having passed through the recuperator the air is let back to the external

environment at the top of the unit.

Service guide

Overview

Introduction This section gives all relevant information about servicing, spare parts and faultfinding.

Preventive

maintenance

The recommended preventive maintenance intervals should not exceed 6 months.

Cleaning/-

inspection

The unit needs to be cleaned according to the recommended preventive maintenance

intervals of 6 months.

Access to the internal and the external fans is possible through the inspection/service

lids.

The core can be internally cleaned by accessing the service lids.

Fault finding Operating errors may occur. These possible faults/problems are listed in column one in

the below table.

The middle column shows the possible cause for the fault.

A possible solution of the problem is to be found in column three.

Problem Cause Solution

The red LED illuminates

constantly

Too high temperature in

the shelter, above 70 °C or

a fan failure

Replace the fan

The red LED is flashing The on board sensor has

been

disconnected/shorted

Replace the controller

The internal fan runs at

low speed

The temperature in the

shelter is below 20 °C

This is due to the control

strategy

The external fan runs at

low speed

The temperature in the

shelter is below 30 °C

This is due to the control

strategy

Contents This section contains the following topics:

Topic See page

How to replace the control panel next page

How to replace the internal fan 10

How to replace the external fan 12

029951 • Version 2.0 • 27.09.2005

How to replace the control panel

Product

description

The control board controls the unit based on inputs from the onboard temperature

sensors.

When to replace The control board only needs to be replaced when it is faulty.

Part number The control board can be ordered under part number 296168.

Tools Make sure you have the following tools available before you start:

•Torx 20 screw driver

•Straight slot screw driver for power plug

Caution! •Only trained and certified technicians are allowed to replace parts

•Switch of the DC supply before working on the unit

•Make sure that all work has been performed before switching on the power again

Illustration This drawing illustrates the control board

and where it is placed in the unit:

Continued overleaf

How to replace the control panel,

continued

Procedure Follow these steps to replace the control board:

Step Action

1 Switch of all the power to the unit

2 Loosen the two straight slot screws on the power plug and remove the

power plug from the controller

3 Remove the 4 torx 20 screws that hold the controller

4 Take out the controller by turning it to the left

5 Remove the two 4-way multi plugs from the controller

6 Mount a new controller by following step 2 to 5 reversed and in opposite

order

7 Connect the power

Result: The test program runs through all functions.

Check that the unit does not come out with an alarm signal.

In case of an alarm signal, please see page 5

029951 • Version 2.0 • 27.09.2005

How to replace the internal fan

When to replace The internal fan only needs to be replaced when it is faulty or as a part of a long time

replacement plan, e.g. after approximately 5 years.

Part number The internal fan can be ordered under part number 296169.

Tools Make sure you have the following tools available before you start:

•Torx 20 screw driver

Caution! •Only trained and certified technicians are allowed to replace parts

•Switch of the DC supply before working on the unit

•Make sure that all work has been performed before switching on the power again

Illustration This drawing illustrates the

internal fan and where the fan is

placed in the unit:

Continued overleaf

Table of contents

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