Master AC 24 Installation Manual
AC 24
Installation manual
Rev. 1.0
EN
Rev. 1.0
Declaration of Conformity
Dantherm S.p.A
Marienlystvej 65
DK - 7800 Skive
Tel.: +45 96 14 37 00
Fax: +45 96 14 38 00
Declaration of following product:
Product name: AC 24
Product no.: 323043
EN
Dehumidication
The product is in conformity with the following directives:
2006/42/EC Machinery Directive
2014/35/EU Low Voltage Directive
2014/30/EU EMC Directive
2014/68/EU Pressure Equipment Directive
2011/65/EU RoHS Directive
1907/2006/EC REACH Regulation
- and is manufactured in conformity with the following harmonised standards:
DS/EN ISO 12100-1:2011 Safety of machinery - General principles for design
EN 60204-1 Safety of machinery - Electrical equipment of machines - Part 1
EN 60 335-1:2012 Household and similar electrical appliances - Safety - Part 1:
EN 60 335-2-40:2003 Household and similar electrical appliances - Safety - Part 2-40
DS/EN 61000-6-2:2005 Electromagnetic compatibility (EMC) - Part 6
DS/EN 61000-6-3:2007 Electromagnetic compatibility (EMC) - Part 6
Skive, 20/08-2018
Product manager
Lars Brodersen
VP Sales
22.08.2018
Overview
Introduction This is the service manual for the Master AC-24 unit.
The below table of contents gives an overview of the main sections.
This manual is for the unit AC 24
Dantherm Number Code NSN
323043 AC-24-B-305-R9010 * 4120-22-631-1514
*) The code is specied on the data plate, which is placed on the control panel.
See the explanation of the syntax code on page 8
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.
Air conditioners should only be operated by qualied (trained) personnel and the repair of
!
Table of main topics This service manual covers the following main topics:
the cooling circuit and electrical system is to be 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 air conditioner. It is important to
know the correct operating procedures for the air conditioner and all safety precautions to
prevent the possibility of property damage and/or personal injury.
Topic See page:
General information 4
Table of content 5
Product description 6
User’s guide 20
Service guide 29
Technical information 45
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General information
Introduction This section gives the general information about this service manual and about the unit.
Target group • Users of the unit
• Technicians who install and maintain the unit
Part number Part number of this service manual is 097881
Copyright Copying of this service manual, or part of it, is forbidden without prior written permission from
Master.
Reservations Master reserves the right to make changes and improvements to the product and the service
manual at any time without prior notice or obligation.
Recycling The unit is designed to last for many years. When the time comes for the unit to be recycled, the
unit should be recycled according to national regulation to protect the environment.
Quality Management
System
Dantherm S.p.A has implemented a Quality Management System according to EN/ISO9001.
The system is supplemented with an Environmental Management System according to EN/
ISO14001. Both systems are approved by third party and certied, by Bureau Veritas Certication.
During 2005 & 2006 the Management Systems were supplemented with business routines
with regards to safety. These routines meet the requirements stated in the international
standard for Safety Management Systems OHSAS18001.
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Table of contents
Table of content
Product description See page
General description 8
Transport of the unit 8
Description of parts 8
Syntax 9
Description of the cooling system 10
Description of the control board 15
Description of room thermostat 17
Description of the high and low pressure switch function 18
Functional Description 19
User´s guide
Preparations 21
Setup 22
Recommended camp conguration 23
Transport of the unit 26
Starting up and shutting down the air conditioner 27
Reset of thermo relay and control circuit fuse 28
Service guide
Preventive maintenance 30
Spare parts 33
Fault nding guide 41
Service agreement 43
Technical information
Technical data 45
Dimensions 46
Wiring diagram, AC 24 47
Wiring diagram reference 49
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Product description
Introduction This section will give you a description of the AC 24 and its functionality.
Content The section covers the following topics:
Topic See page
General description 8
Transport of the unit 8
Description of parts 8
Syntax 9
Description of the cooling system 10
Description of the control board 15
Description of room thermostat 17
Description of the high and low pressure switch function 18
Functional Description 19
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General description
Introduction
General
Typical applications
Functionality
WARNING
This section describes the unit as a whole.
The following sections describe the dierent parts of the unit..
The AC 24 is a portable air conditioner that is made of high quality materials and the production process is
subject to constant quality checking. The instructions in this service manual have been prepared to ensure
that, when followed, this air condi-tioner will provide long and ecient service.
The AC 24 is designed primarily to supply cooled air to tents and other types of temporary portable
shelters.
The function of the unit is based on a cooling circuit and two powerful centrifugal fans. The lower section
contains the evaporator and the evaporator fan which draws warm ambient or recirculated air through the
cold evaporator coil and blows out the cooled air through the discharge.
The upper section of the unit houses the condenser fan and the condenser coil which returns the heat
taken from the cooled air to the surrounding atmosphere.
Do not cover, block or obstruct the air openings. This may cause malfunction!
Do not operate the product outside the specied temperature range.
See section “Technical data”.
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General description, continued
Illustration This illustration gives an overview of the unit.
Parts
Transport of the unit.
Item Description
1 Handlebars for transport ( Accessories)
2 Wheels for easy eld mobility of the unit (Accessories)
3 Control panel with function switch and lamps
4 Mains cable
5 Room thermostat
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Syntax
Introduction
Example
All products are named according to a syntax giving information about the specic unit conguration.
This example is not necessarily related to the specic unit this manual describes:
AC_24_B_305_R9010
AC Air conditioner
24 Nominal performance 24.000BTU/h
B 1ph; 230VAC; 50Hz
C 1ph; 230VAC; 60Hz
305 Duct connection size - mm
R RAL Color code
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Description of parts
Introduction This section gives a description of the following parts of the AC 24:
• Cabinet • Fans
• Air lters • Mains cable
• Heating coil • Air openings
The following sections in this chapter give separate detailed descriptions of the cooling circuit,
the control board and operation.
For illustration of the single components – please see section “General description”
Cabinet The unit is made of strong construction in sheet metal plates which are galvanized to protect
against corrosion.
The outside paint nish is standard white, RAL 9010.
In the middle plate there is a drain outlet for condensate.
On each side of the unit a plate can be removed to make inspection and service possible.
Inside the unit there is a horizontal partition dividing it into an upper and a lower section.
Fans In both upper and lower sections there is a centrifugal fan with a direct-coupled motor.
Condenser fan
Evaporator fan
Air lters The internal airow enters through a standard washable, easily removable air lter, PPI 15.
The lter is situated behind the return air inlet
The rods keeping the lter
in place are accessible
through the fan opening
without having to remove
the cover.
The airow will be inuenced by the resistance in lters, hoses and coils, which must be kept
clean to minimize the pressure drop.
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Description of parts, continued
Mains cable The unit requires an external electric power source.
The mains cable is 10 m long and normally has a 16 A CEE connector at its end.
Air openings
Varm air outlet
Cold air intake
Cold air out
Hot Air intake
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Description of parts, continued
Air openings, continued
WARNING Do not cover or obstruct air openings!
inlets/outlets Purpose
Supply air outlet,
1 × 315 mm
Return air inlet,
1 × 315 mm
Ambient air inlet Ambient air is ducted in through the
Exhaust air outlet Condenser exhaust air leaves the air
Air is supplied to the tent/shelter through
these openings.
Flexible air hose(s) will be connected here
Air is drawn into the unit through this/these
opening(s). With connected air hose(s) the
unit is supplied with recirculated return air
from the tent/shelter
Flexible air hose(s) will be connected here
condenser after entering the external
removable lter
conditioner
through these openings
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Description of the cooling system
Illustration This drawing illustrates the dierent parts
of the cooling circuit and where
they are situated in the AC 24 unit:
Parts and their function This table gives an overview and short description of each part shown above and on
the next page:
Compressor Circulates the uid in the cooling system
Condenser Emits the heat generated in the tent/room to the outside air
Receiver Accumulates surplus coolant in connection with the cooling process
Dry lter Absorbs moisture and impurities in the cooling circuit
Sight glass Enables a visual check of the coolant
Expansion valve Supplies the correct quantity of coolant into the evaporator. It also
Evaporator Absorbs heat from the shelter by cooling down the circulated air
HP pressure
switch
LP Pressure
switch
Refrigerant The cooling circuit is hermetically sealed and lled with refrigerant (R134a).
Liquid ow
From the receiver liquid refrigerant will ow under high pressure through the liquid line
dryer and the sight glass to the thermostatic expansion valve which releases the pressure. Here
the refrigerant is led into the evaporator where it evaporates under low pressure and low
temperatures.
The evaporated refrigerant is drawn back to the hermetic compressor and compressed. From
the compressor the refrigerant vapour goes to the condenser, where it is cooled to below the
dew point and condensed to liquid refrigerant.
reduces the pressure
Ensures that the compressor does not operate at too high pressure
Ensures that the compressor does not operate at too low pressure
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Description of the cooling system, continued
Description Both evaporator and condenser are heat exchangers with copper tubes and aluminium coated
ns. By the cooling of the evaporator air stream heat is adapted to the cooling circuit and
released in the condenser together with the electric energy consumption of the compressor.
At room temperatures below 20 °C, where cooling is not normally required, the humidity in
the airow will form ice on the evaporator. To prevent this, the LP pressure switch cuts out
at low pressure in the circuit. If the room temperature is too low, the LP activation will cause
the compressor to start and stop frequently. This may damage the compressor and must be
avoided at any time by not operating the product outside the specied temperature range. See
section “Technical data”, page 54. At high ambient temperatures (above 55 °C) the cooling of the
condenser airow will be too poor, and the high pressure results in cut out of the HP pressure
switch.
The yellow lamp on the front panel will illuminate if the HP/LP pressure switch cuts out. The HP/
LP pressure switch automatically resets after a few minutes and the lamp will switch o again. If
the lamp continues to illuminate, please refer to the “Fault nding guide”, page 50.
Schematic view This schematic drawing illustrates the dierent parts of the cooling circuit.
9 8
7
Compressor
Condenser
Receiver
Dry lter
Sight glass
Expansion valve
Evaporator
HP pressure switch
LP pressure switch
2
1
3456
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Description of the control board
Introduction This section gives a description of the control board.
A description of how to start up, for example, is found in the relevant sections.
The control panel on the front contains the controls required for normal operation.
Illustration This drawing illustrates the control board of the AC 24:
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Description of the control board, continued
Part/function This table gives an overview of each part of the control panel in g. 6:
No
Part Function
Electric
connection
Function
switch
Indicator
lamps
Mains cable with a 16 A CEE connector at the end
The function switch selects the operating mode and has three positions:
VENT, OFF and AUTO
On the operator panel there are three control lamps, indicating the
following:
Color Unit Description
Green Power Shows that power has been connected to the unit
Red Thermo
relay fail
Illuminates if the compressor, evaporator fan or
condenser fan thermo relay has cut o because of a
too high running current.
Please also refer to the “Fault nding guide”
Yellow HP/LP Illuminates when the built-in HP/LP pressure switch
cuts out and stops the com-pressor because of too
high pressure (HP) or low pressure (LP) in the cooling
circuit. The HP/LP pressure switch automatically
resets after a few minutes. Do not let the product
operate with HP/LP switching ON and OFF.
If the lamp continues to illuminate, please refer to
the “Fault nding guide”
Reset
button
•Compressor
•Evaporator fan
•Condenser fan
Thermostat
connection
If the failure indicator (Thermo relay ) illuminates, the thermo relay will
have to be reset on one of the reset buttons.
If it is not clear which one of the thermo relays has disconnected, push the
reset buttons one by one.
See also “Fault nding guide”
Cable for the remote thermostat
16
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