Dantherm Hex 6 A User manual

Hex 6 A
EN
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
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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
Copyright Copying of this service manual, or part of it, is forbidden without prior written permission
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
4

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
c
d
ef
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
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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.
6

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
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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
8

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
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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
10