Assembly and operating instructions
REMKO ML...DC
ML 263 DC, ML 353 DC, ML 523 DC
Inverter wall-mounted room air conditioner with split design
0049-2015-01 Edition 3, en_GB
Read the instructions prior to performing any task!
Read these operating instructions carefully before commissioning / using this device!
These instructions are an integral part of the system and must
always be kept near or on the device.
Subject to modifications; No liability accepted for errors or misprints!
Installation and operating instructions (translation of the original)
Table of contents
1 Safety and usage instructions............................................................................................................. 5
1.1 General safety notes....................................................................................................................... 5
1.2 Identification of notes...................................................................................................................... 5
1.3 Personnel qualifications.................................................................................................................. 5
1.4 Dangers of failure to observe the safety notes................................................................................ 5
1.5 Safety-conscious working............................................................................................................... 5
1.6 Safety notes for the operator........................................................................................................... 6
1.7 Safety notes for installation, maintenance and inspection.............................................................. 6
1.8 Unauthorised modification and changes......................................................................................... 6
1.9 Intended use................................................................................................................................... 6
1.10 Warranty........................................................................................................................................ 6
1.11 Transport and packaging.............................................................................................................. 7
1.12 Environmental protection and recycling........................................................................................ 7
2 Technical data....................................................................................................................................... 8
2.1 Unit data.......................................................................................................................................... 8
2.2 Unit dimensions ............................................................................................................................ 10
2.3 Performance curves for heating and cooling ................................................................................ 11
3 Design and function............................................................................................................................ 14
3.1 Unit description............................................................................................................................. 14
4 Operation............................................................................................................................................. 15
5
Installation instructions for qualified personnel.............................................................................. 23
5.1 Important notes prior to installation............................................................................................... 23
5.2 Wall openings................................................................................................................................ 23
5.3 Installation materials..................................................................................................................... 23
5.4 Selection of installation location ................................................................................................... 24
5.5 Minimum clearances..................................................................................................................... 25
5.6 Oil return measures....................................................................................................................... 26
5.7 Connection variants for the indoor unit......................................................................................... 26
5.8 Wall bracket for the indoor unit..................................................................................................... 26
6 Installation........................................................................................................................................... 27
6.1 Installation of the indoor unit......................................................................................................... 27
6.2 Connecting the refrigerant piping.................................................................................................. 27
6.3 Additional notes on connecting the refrigerant piping................................................................... 29
6.4 Leak testing................................................................................................................................... 30
6.5 Adding refrigerant.......................................................................................................................... 30
7 Condensate drainage connection and safe drainage...................................................................... 31
8 Electrical wiring................................................................................................................................... 33
8.1 General Information...................................................................................................................... 33
8.2 Connecting the indoor unit............................................................................................................ 33
8.3 Connecting the outdoor unit.......................................................................................................... 34
8.4 Electrical wiring diagram............................................................................................................... 34
8.5 Electrical drawings........................................................................................................................ 36
9 Before commissioning....................................................................................................................... 42
10 Commissioning................................................................................................................................... 42
11 Troubleshooting, fault analysis and customer service................................................................... 44
11.1 Troubleshooting and customer service....................................................................................... 44
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REMKO ML...DC
11.2 Indoor unit fault analysis............................................................................................................. 46
12 Care and maintenance........................................................................................................................ 52
13
Shutdown............................................................................................................................................. 54
14 Exploded view and spare parts lists................................................................................................. 55
14.1 Exploded view - Indoor unit......................................................................................................... 55
14.2 Spare parts list - Indoor unit........................................................................................................ 56
14.3 Exploded view - Outdoor unit...................................................................................................... 57
14.4 Spare parts list - Outdoor unit..................................................................................................... 58
15 Index..................................................................................................................................................... 59
4
1
1.1
Carefully read the operating manual before commissioning the units for the first time. It contains
useful tips and notes such as hazard warnings to
prevent personal injury and material damage.
Failure to follow the directions in this manual not
only presents a danger to people, the environment
and the system itself, but will void any claims for
liability.
Keep this operating manual and the refrigerant
data sheet near to the units.
1.2
This section provides an overview of all important
safety aspects for proper protection of people and
safe and fault-free operation.The instructions and
safety notes contained within this manual must be
observed in order to prevent accidents, personal
injury and material damage.
Notes attached directly to the units must be
observed in their entirety and be kept in a fully
legible condition.
Safety notes in this manual are indicated by symbols. Safety notes are introduced with signal words
which help to highlight the magnitude of the danger
in question.
Safety and usage instructions
General safety notes
Identification of notes
DANGER!
CAUTION!
This combination of symbol and signal word
warns of a potentially hazardous situation,
which if not avoided may cause injury or material and environmental damage.
NOTICE!
This combination of symbol and signal word
warns of a potentially hazardous situation,
which if not avoided may cause material and
environmental damage.
This symbol highlights useful tips and recommendations as well as information for efficient
and fault-free operation.
1.3
Personnel qualifications
Personnel responsible for commissioning, operation, maintenance, inspection and installation must
be able to demonstrate that they hold a qualification which proves their ability to undertake the
work.
Contact with live parts poses an immediate
danger of death due to electric shock. Damage
to the insulation or individual components may
pose a danger of death.
DANGER!
This combination of symbol and signal word
warns of a situation in which there is immediate
danger, which if not avoided may be fatal or
cause serious injury.
WARNING!
This combination of symbol and signal word
warns of a potentially hazardous situation,
which if not avoided may be fatal or cause
serious injury.
Dangers of failure to observe
1.4
the safety notes
Failure to observe the safety notes may pose a risk
to people, the environment and the units. Failure to
observe the safety notes may void any claims for
damages.
In particular, failure to observe the safety notes
may pose the following risks:
n The failure of important unit functions.
n The failure of prescribed methods of mainte-
nance and repair.
n Danger to people on account of electrical and
mechanical effects.
1.5
Safety-conscious working
The safety notes contained in this manual, the
existing national regulations concerning accident
prevention as well as any internal company
working, operating and safety regulations must be
observed.
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REMKO ML...DC
1.6
Safety notes for the operator
The operational safety of the units and components is only assured providing they are used as
intended and in a fully assembled state.
n The units and components may only be set up,
installed and maintained by qualified personnel.
n Protective covers (grille) over moving parts
must not be removed from units that are in
operation.
n Do not operate units or components with
obvious defects or signs of damage.
n Contact with certain unit parts or components
may lead to burns or injury.
n The units and components must not be
exposed to any mechanical load, extreme
levels of humidity or extreme temperature.
n Spaces in which refrigerant can leak sufficient
to load and vent. Otherwise there is danger of
suffocation.
n All housing parts and device openings, e.g. air
inlets and outlets, must be free from foreign
objects, fluids or gases.
n The units must be inspected by a service tech-
nician at least once annually. Visual inspections and cleaning may be performed by the
operator when the units are disconnected from
the mains.
Safety notes for installation,
1.7
maintenance and inspection
n Appropriate hazard prevention measures must
be taken to prevent risks to people when performing installation, repair, maintenance or
cleaning work on the units.
n The setup, connection and operation of the
units and its components must be undertaken
in accordance with the usage and operating
conditions stipulated in this manual and comply
with all applicable regional regulations.
n Local regulations and laws such as Water
Ecology Act must be observed.
n The power supply should be adapted to the
requirements of the units.
n Units may only be mounted at the points pro-
vided for this purpose at the factory. The units
may only be secured or mounted on stable
structures, walls or floors.
n Mobile units must be set up securely on suit-
able surfaces and in an upright position. Stationary units must be permanently installed for
operation.
n The units and components should not be oper-
ated in areas where there is a heightened risk
of damage. Observe the minimum clearances.
n The units and components must be kept at an
adequate distance from flammable, explosive,
combustible, abrasive and dirty areas or
atmospheres.
n Safety devices must not be altered or
bypassed.
Unauthorised modification
1.8
and changes
Modifications or changes to units and components
are not permitted and may cause malfunctions.
Safety devices may not be modified or bypassed.
Original replacement parts and accessories
authorised by the manufactured ensure safety. The
use of other parts may invalidate liability for
resulting consequences.
1.9
Intended use
Depending on the model, the units and the additional fittings with which they are equipped are only
intended to be used as an air-conditioner for the
purpose of cooling or heating the air in an
enclosed space.
Any different or additional use is a non-intended
use. The manufacturer/supplier assumes no liability for damages arising from a non-intended use.
The user bears the sole risk in such cases.
Intended use also includes working in accordance
with the operating and installation instructions and
complying with the maintenance requirements.
The threshold values specified in the technical
data must not be exceeded.
1.10
For warranty claims to be considered, it is essential
that the ordering party or its representative complete and return the "certificate of warranty" to
REMKO GmbH & Co. KG at the time when the
units are purchased and commissioned.
The warranty conditions are detailed in the "General business and delivery conditions". Furthermore, only the parties to a contract can conclude
special agreements beyond these conditions. In
this case, contact your contractual partner in the
first instance.
Warranty
6
1.11
The devices are supplied in a sturdy shipping container. Please check the equipment immediately
upon delivery and note any damage or missing
parts on the delivery and inform the shipper and
your contractual partner. For later complaints can
not be guaranteed.
Plastic films and bags etc. are dangerous
toys for children!
Why:
- Leave packaging material are not around.
- Packaging material may not be accessible to
children!
1.12
Disposal of packaging
All products are packed for transport in environmentally friendly materials. Make a valuable contribution to reducing waste and sustaining raw materials. Only dispose of packaging at approved
collection points.
Transport and packaging
WARNING!
Environmental protection and recycling
Disposal of equipment and components
Only recyclable materials are used in the manufacture of the devices and components. Help protect
the environment by ensuring that the devices or
components (for example batteries) are not disposed in household waste, but only in accordance
with local regulations and in an environmentally
safe manner, e.g. using certified firms and recycling specialists or at collection points.
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REMKO ML...DC
2
2.1
Technical data
Unit data
Series ML 263 DC ML 353 DC ML 523 DC
Operating mode
Nominal cooling output
Energy efficiency ratio SEER
1)
1)
El. rated power consumpt., cooling
El. rated current consumpt., cooling
Power consumption, annual, QCE
Energy efficiency ratio, cooling
Nominal heat capacity
2)
Energy efficiency ratio SCOP
3)
1)
4)
El. rated power consumpt., heating
El. rated current consumpt., heating
Power consumption, annual, QHE
3)
1)
1)
2)
2)
kW
kW
kWh 172 187 269
kW
kW
kWh 958 1179 1805
A
A
Inverter wall-mounted room air conditioner combination
for cooling and heating
2.80 (1.00-3.70) 3.50 (1.10-4.10) 5.10 (3.10-6.20)
5.7 5.8 6.5
0.90 1.05 2.19
3.90 4.50 9.50
A+ A+ A++
2.60 (0.90-3.80) 3.70 (1.00-4.40) 5.30 (1.50-6.40)
3.8 3.8 3.8
0.72 0.91 1.89
3.10 3.90 8.20
Energy efficiency ratio, heating
2)
A A A
Max. power consumption kW 2.00 2.30 2.55
Max. current consumption A 9.00 10.50 11.50
EDP no. 1633263 1633353 1633523
Data specific to indoor unit ML 263 DC IT ML 353 DC IT ML 523 DC IT
From serial number: 1305... 1307... 1309...
Application area (room vol.), approx.
m
3
80 110 160
Adjustment range, room temperature °C +17 to +30 +8 with "FP" function
Operating range °C +17 to +32
Air flow volume per level m³/h 400/530/620 410/570/640 440/500/680
5)
Sound pressure level p. speed set.
Sound pres. level, Silent/Turbo mode
dB (A) 29/37/41 29/39/42 28/31/33
5)
dB (A) 26/43 22/44 26/41
Sound power level max. dB(A) 58 58 55
Enclosure class IP X 0
Condensate drainage connection mm 18
Dimensions: H/W/D mm 275/800/188 275/800/188 275/940/205
Weight kg 6.5 8.0 9.0
EDP no. 1633264 1633354 1633524
8
Data specific to outdoor unit ML 263 DC AT ML 353 DC AT ML 523 DC AT
Power supply
V/Ph/
Hz
230 / 1~ / 50
Operating range, cooling °C +5 to +50
Operating range, heating °C
+5 to +30
7)
Air flow rate, max. m³/h 1800 1800 2200
Enclosure class IP 24
Sound power level max. dB (A) 64 64 62
Sound pressure level
Refrigerant
6)
5)
dB (A) 56 56 54
R 410A
Refrigerant, basic capacity kg 0.80 0.80 1.25
Max. operating pressure kPa 4200 / 1500
Refrigerant, additional quantity >5m g/m 20
Refrigerant piping, max. length m 25 25 30
Refrigerant piping, max. height m 10 10 15
Refrigerant connection
Liquid line
Inche
s
(mm)
1/4 (6.35) 1/4 (6.35) 1/4 (6.35)
Refrigerant connection
Suction pipe
Inche
s
(mm)
3/8 (9.52) 3/8 (9.52) 1/2 (12.70)
Dimensions: H/W/D mm 540/780/250 540/780/250 590/760/285
Weight kg 29.50 29.50 35.0
From serial number 1306... 1308... 1310...
EDP no. 1633265 1633355 1633525
1)
Air inlet temp. TK 27°C / FK 19°C, outside temperature TK 35°C, FK 24°C, max. air flow volume,
5m pipe length
2)
Air inlet temp. TK 20°C, outside temperature TK 7°C, FK 6°C, max. air flow volume, 5m pipe length
3)
The specified value is based on results from standard testing.
The actual consumption depends on the use and location of the unit
4)
The specified value is based on the average heating period
5)
At distance of 1m in the open air; specified values are maximum values
6)
Contains greenhouse gas in accordance with the Kyoto protocol, GWP 1975 (for further information, see chapter "Adding refrigerant")
7)
This can be extended to -15°C with the appropriate accessory kit
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A
B
C
D
E
A
B
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REMKO ML...DC
2.2
Unit dimensions
Outdoor units
Fig. 1: Outdoor unit dimensions ML 263 DC AT-523 DC AT (All measurements in mm)
Dimensions (mm) A B C D E
ML 263 DC AT-353 DC AT 540 780 250 549 276
ML 523 DC AT 590 760 285 535 285
Indoor units
Fig. 2: Indoor unit dimensions ML 263 DC IT-523 DC IT (All measurements in mm)
Dimensions (mm) A B C
ML 263 DC IT-353 DC IT 275 800 188
ML 523 DC IT 275 940 205
We reserve the right to modify the dimensions and design as part of the ongoing technical development
process.
10
0,00
1,00
2,00
3,00
4,00
5,00
12 7 2 0 -7 -10 -15
2
1
3
A
[°C]
0,00
0,50
1,00
1,50
2,00
2,50
3,00
3,50
4,00
21 25 30 35 40 45 50
2
1
3
A
[°C]
2.3
Performance curves
for heating and cooling
Heating capacity ML 263 DC
Fig. 3: Performance curves, heating ML 263 DC (data for 20 °C indoor temperature)
A: Outside temperature
1: COP
2: Heating capacity in kW
3: Power consumption in kW
Outside temp. in °C 12 7 2 0 -7 -10 -15
Heating capacity in kW 3.01 2.65 2.52 2.39 2.13 2.00 1.73
Power consumption in kW 0.69 0.68 1.14 1.08 1.01 1.01 0.95
COP 4.35 3.89 2.21 2.23 2.12 1.99 1.82
Cooling capacity ML 263 DC
Fig. 4: Performance curves, cooling ML 263 DC (data for 27/19 °C indoor temperature)
A: Outside temperature
1: EER
2: Cooling capacity in kW
3: Power consumption in kW
Outside temp. in °C 21 25 30 35 40 45 50
Cooling capacity in kW 2.64 2.82 2.84 2.74 2.35 2.23 2.17
Power consumption in kW 0.74 0.80 0.87 0.95 0.96 0.98 1.02
EER 3.57 3.53 3.27 2.88 2.44 2.27 2.13
11
0,00
1,00
2,00
3,00
4,00
5,00
12 7 2 0 -7 -10 -15
2
1
3
A
[°C]
0,00
0,50
1,00
1,50
2,00
2,50
3,00
3,50
4,00
21 25 30 35 40 45 50
2
1
3
A
[°C]
REMKO ML...DC
Heating capacity ML 353 DC
Fig. 5: Performance curves, heating ML 353 DC (data for 20 °C indoor temperature)
A: Outside temperature
1: COP
2: Heating capacity in kW
3: Power consumption in kW
Outside temp. in °C 12 7 2 0 -7 -10 -15
Heating capacity in kW 3.75 3.30 3.14 2.98 2.65 2.49 2.15
Power consumption in kW 0.95 0.93 1.56 1.47 1.38 1.38 1.30
COP 3.96 3.54 2.01 2.03 1.93 1.81 1.65
Cooling capacity ML 353 DC
Fig. 6: Performance curves, cooling ML 353 DC (data for 27/19 °C indoor temperature)
A: Outside temperature
1: EER
2: Cooling capacity in kW
3: Power consumption in kW
Outside temp. in °C 21 25 30 35 40 45 50
Cooling capacity in kW 3.12 3.32 3.35 3.23 2.77 2.63 2.56
Power consumption in kW 0.85 0.92 1.00 1.10 1.11 1.13 1.18
EER 3.65 3.60 3.34 2.94 2.49 2.32 2.17
12
Heating capacity ML 523 DC
0,00
1,00
2,00
3,00
4,00
5,00
6,00
7,00
12 7 2 0 -7 -10 -15
2
1
3
A
[°C]
0,00
1,00
2,00
3,00
4,00
5,00
6,00
21 25 30 35 40 45 50
2
1
3
A
[°C]
Fig. 7: Performance curves, heating ML 523 DC (data for 20 °C indoor temperature)
A: Outside temperature
1: COP
2: Heating capacity in kW
3: Power consumption in kW
Outside temp. in °C 12 7 2 0 -7 -10 -15
Heating capacity in kW 5.79 5.09 4.85 4.61 4.10 3.85 3.33
Power consumption in kW 1.47 1.45 2.43 2.29 2.14 2.14 2.02
COP 3.94 3.52 2.00 2.01 1.92 1.80 1.64
Cooling capacity ML 523 DC
Fig. 8: Performance curves, cooling ML 523 DC (data for 27/19 °C indoor temperature)
A: Outside temperature
1: EER
2: Cooling capacity in kW
3: Power consumption in kW
Outside temp. in °C 21 25 30 35 40 45 50
Cooling capacity in kW 4.71 5.03 5.07 4.88 4.19 3.97 3.87
Power consumption in kW 1.38 1.49 1.62 1.77 1.79 1.83 1.89
EER 3.42 3.38 3.13 2.76 2.34 2.17 2.04
13
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4
3
2
1
4
3
5
7
8
9
6
1
7
8
9
B
A
4
3
5
6
2
3
5
REMKO ML...DC
3
3.1
The ML 263 DC-523 DC room air conditioners
have a REMKO ML...AT outdoor unit as well as an
ML...IT indoor unit.
In cooling mode, the outdoor unit serves to output
the heat extracted by the indoor unit from the room
being cooled. In heating mode, the heat taken up
by the outdoor unit can be discharged by the
indoor unit into the room to be heated. In both
operating modes, the output produced by the compressor precisely matches requirements, and
thereby regulates the nominal temperature with
minimal temperature deviations. This "inverter
technology" results in energy savings over conventional split systems and also reduces noise emissions to a particularly low level. The outdoor unit
can be installed in an outdoor area or, providing
that certain requirements are met, an indoor area.
The indoor unit is designed to be mounted high up
on the wall, in indoor areas. It is operated by an
infrared remote control.
The outdoor unit consists of a cooling cycle with
compressor, fin condenser, condenser fan,
reversing valve and throttle element. The outdoor
unit is controlled by the controller in the indoor unit.
The indoor unit consists of a fin evaporator, evaporator fan, controller and condensate tray.
Floor brackets, wall brackets, refrigerant piping and
condensate pumps are available as accessories.
Design and function
Unit description
Fig. 10: Cooling cycle diagram for outdoor unit
1: Condenser
2: Condenser fan
3: Reversing valve
4: Compressor
5: Filter dryer
6: Capillary tube throttle element
7: Pressure gauge connection
8: Suction pipe connection valve
9: Liquid line connection valve
Fig. 11: System layout
A: Outdoor area
B: Indoor area
1: Indoor unit
2: Outdoor unit
Fig. 9: Cooling cycle diagram for indoor unit
1: Evaporator
2: Evaporator fan
3: Suction pipe connection
4: Liquid line connection
3: Condensate drainage line
4: Condenser fan
5: Power supply
6: Shut-off valve
7: Suction pipe
8: Liquid line
9: Control line
Refrigerant piping is used to connect the indoor
unit to the outdoor unit.
14
max. 6 m
2
1
4
3
65
4
The indoor unit is easily operated using the
standard infrared remote control. The indoor unit
beeps to acknowledge the correct transmission of
data. If it is not possible to program the indoor unit
with the remote control, then it can also be manually operated.
Manual mode
The indoor units can be put into operation manually. After the air inlet screen has been opened,
the inner recessed key can be pressed and automatic mode can be activated. In manual mode, the
following settings apply:
Cooling mode: last setting
Fan speed: AUTO
Heating mode: last setting
Fan: AUTO
Press a key on the infrared remote control to interrupt manual mode.
Operation
Alarms are indicated by a code (see chapter
Troubleshooting and customer service).
NOTICE!
Immediately replace flat batteries with a new
set, otherwise there is a risk of leakage. It is
recommended that the batteries are removed if
the equipment is shut down for longer periods.
Help save on energy consumption in stand-by
mode! If the device, system or component is
not in use, we recommend disconnecting the
power supply. Components with a safety function is excluded from our recommendation!
Infrared remote control
The infrared remote control sends the programmed
settings a distance of up to 6 m to the receiver of
the indoor unit. Data will only be received correctly
if the remote control is pointed at the receiver and
no objects are obstructing the transmission path.
Two AAA batteries must be inserted into the
remote control in preparation. To do so, remove
the flap from the battery compartment and insert
the batteries the correct way around (see markings). Removing the batteries causes all stored
data to be lost. The remote control will then access
the default settings, which you are free to customise at any time.
Display on indoor unit
The display illuminates according to the settings.
Fig. 13: Display on indoor unit
1: Signal receiver
2: Automatic mode
3: Defrosting mode
4: Display Display of coded error messages,
room and target temperature
5: Operation
6: Timer
Fig. 12: Maximum distance
15
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1
4
3
5
7
9
12
14
6 8
10
11
13
1
2
3
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8
REMKO ML...DC
Keys on the remote control
"FAN" key
Press this key to set the desired fan speed. 4
speeds are available:
Automatic, low, medium and high fan stage.
"SLEEP/FRESH" key
"SLEEP" key
Pressing this key will automatically increase or
decrease the target temperature by 1 °C within an
hour in cooling and heating mode respectively.
Press this key to maintain the most convenient
temperature and save energy. This function is only
available in "Cooling", "Heating" and "Auto" modes.
If the unit is working in "SLEEP" mode, this activity
is interrupted by pressing the "MODE", "FAN",
"Speed" or ""ON/OFF" keys.
"FRESH" key
Activates the unit's ion generator. This releases
negatively charged particles into the airflow, which
neutralises the influences of smoke and dust,
among other things.
Fig. 14: Keys on the remote control
"ON/OFF" key
Press this key to put the unit into operation and
take it out of operation.
"MODE" key
Press this key to select the operating mode. The
indoor unit has 5 modes:
1. Automatic mode
In this mode, the unit works in cooling or in heating
mode.
2. Cooling mode
In this mode, the warm air in the room is cooled
down to the preset temperature.
3. Dehumidification mode
In this mode, the room is dehumidified, thereby the
room temperature significantly lowered. Influencing
temperature and fan speed in this mode not possible.
4. Heating mode
In this mode, the warm air in the room is heated up
to the desired temperature.
5. Recirculation mode
"TURBO" key
Press this key to directly activate the oscillating
function of the fins for better air distribution in the
room.
The "TURBO" function allows the preset temperature to be reached in the shortest possible time.
Pressing this key in "Cooling mode" causes the
unit to blow a blast of cooling air into the room at a
very high fan speed.
"SELF CLEAN" key
This key activates the self-clean function.
" ▲ " and " ▼ " keys
The " ▲ " key increases the desired temperature to
30°C in 1°C increments.
The " ▼ " key decreases the desired temperature
to 17°C in 1°C increments .
"LED" key
This key switches the backlight of the display on
the remote control off and back on again.
In this mode, the air in the room is recirculated.
Temperature selection is not possible.
16
9
10
11
12
13
14
2
1
4
3
5
7
9
6
8
"FOLLOW ME" key
Indicators on the LCD
Pressing this key initiates the "Follow Me" function.
The display on the remote control shows the actual
temperature of the current location of the remote
control. The remote control transmits this signal to
the air conditioning unit at intervals of 3 minutes,
until the "Follow Me" key is pressed again. The air
conditioning unit automatically cancels the "Follow
Me" function if it has not received the signal for a
period of 7 minutes.
"SILENT MODE" / "FP" key
This key activates/deactivates Silent mode.
The fan speed is reduced to a minimum.
In this mode, the air conditioning unit operates
Fig. 15: Indicators on the LCD
silently.
1: Mode indicator - shows the current operating
The "FP" (Freeze Protection) key activates a frost
protection function with which the setpoint in heat
mode is set to ca. 8°C.
modes, including Auto ( ), Cooling ( ), Dehu-
midification ( ), Heating ( ), Fan ( ) and
back to Auto ( ) mode.
2: Signal transmission symbol. This symbol
appears when signals are being transmitted
"TIMER ON" key
This key initiates the automatic switch-on time for
the unit. Each time the key is pressed, the automatic time setting increases in increments of 30
minutes. Once the time setting shows 10.0, the
automatic time setting increases in increments of
60 minutes each time the key is pressed. In order
to cancel the automatic time setting, simply set the
automatic switch-on time to 0.0.
from the remote control to the indoor unit.
3: ON/OFF symbol. This symbol appears when
the "ON/OFF" key is pressed. Pressing this key
again causes the indicator to go out.
4: TIMER ON symbol. This symbol appears when
TIMER ON is switched on.
5: TIMER OFF symbol. This symbol appears
when TIMER OFF is switched on.
6: Sleep symbol. This symbol appears when the
"Sleep" function is activated. Pressing this key
again causes the indicator to go out.
"TIMER OFF" key
This key initiates the automatic switch-off time for
the unit. Each time the key is pressed, the automatic time setting increases in increments of 30
minutes. Once the time setting shows 10.0, the
automatic time setting increases in increments of
60 minutes each time the key is pressed. In order
to cancel the automatic time setting, simply set the
automatic switch-off time to 0.0.
7: Temperature/Timer symbol. Shows the temper-
ature setting (-17°C~30°C). If "FAN" mode is
selected, the temperature setting is not dis-
played. In Timer mode, the ON and OFF set-
tings appear for the TIMER.
8: FOLLOW ME symbol. This symbol appears
when the "Follow me" function is activated.
9: Fan speed symbol. This is where the selected
fan speeds are displayed: AUTO (no indicator)
and the three fan speed settings: (slow),
(medium) and
(fast). The fan speed is set to "Automatic"
"DIRECT" key
when either "Auto" or "Dehumidification" mode
is activated.
This key sets the desired fin position of the
exhaust fins. Each time the "DIRECT" key is
pressed, the fins change position by 6 degrees.
This key is used to stop and start the automatic
"Swing" function of the horizontal exhaust fins.
"SWING" key
The illustration of the LCD with all of the symbols present is only intended to provide a
clearer overview. During operation, only those
symbols relevant to the respective functions
appear on the display.
17
1
3
2
1
4
2
3
REMKO ML...DC
Key functions
A symbol is shown on the display to indicate that
the settings are being transferred.
"Auto" mode
Make sure that the indoor unit is connected to the
power supply, and is switched on.
The operating mode indicator on the display of the
indoor unit begins to flash.
1. Press the "MODE" key to select "Auto"
mode.
2. Press the "UP/DOWN" key to set the desired
temperature. The temperature can be set
between 17 and 30°C, in increments of 1°C.
3. Press the "ON/OFF" key to switch on the air
conditioning unit.
"Cooling", "Heating" and "Recirculation" mode
Make sure that the indoor unit is connected to the
power supply, and is switched on.
1. Press the "MODE" key to select from operating modes "Cooling", "Heating" or "Recirculation".
2. Press the "UP/DOWN" key to set the desired
temperature. The temperature can be set
between 17 and 30°C, in increments of 1°C.
3. Press the "FAN" key to select from the four
fan speeds (Auto, slow, medium and fast).
4. Press the "ON/OFF" key to switch on the air
conditioning unit.
Fig. 16: "Auto" mode
– In "Auto" mode, the air conditioning unit is
able to logically select between the
"Cooling" , "Recirculation" and "Heating"
modes, specifically by detecting the difference between the actual room temperature
and the temperature set on the remote
control.
– In "Auto" mode, it is not possible to set the
fan speed. This is already controlled automatically.
– If "Auto" mode is not comfortable enough
for you, you can also select the desired
mode manually.
Fig. 17: "Cooling", "Heating" and "Recirculation"
mode
– In "Fan" mode, the temperature setting is
not shown on the remote control, and it is
not possible to check the room temperature. In this case steps 1, 3 and 4 can be
carried out.
"Dehumidification" mode
Make sure that the indoor unit is connected to the
power supply, and is switched on.
The operating mode indicator on the display of the
indoor unit begins to flash.
18
1
3
2
1
2
1. Press the "MODE" key to select "Dehumidification" mode.
2. Press the "UP/DOWN" key to set the desired
temperature. The temperature can be set
between 17 and 30°C, in increments of 1°C.
3. Press the "ON/OFF" key to switch on the air
conditioning unit.
1. Press the "TIMER ON" key. The remote control shows "TIMER ON", the last "Auto on"
time setting and the symbol "H" appears on
the display. The unit is now ready to reset the
"Auto on" time and to start "TIMER ON"
mode.
2. Press the "TIMER ON" key again to set the
desired "Auto on" time. Each time the key is
pressed, the time is increased by half an
hour between 0 and 10 hours, and by an
hour between 10 and 24 hours.
3. Once these settings have been made, there
is a one second delay before the remote control transmits the signal to the indoor unit.
Then, after approx. two seconds, the "H"
symbol disappears from the LCD display,
and the set temperature appears again on
the display.
Fig. 18: "Dehumidification" mode
In "Dehumidification" mode, it is not possible to
set the fan speed. This is already controlled
automatically.
"Timer" mode
Press the "TIMER ON" key to set the "Auto on"
time and the "TIMER OFF" key to set the "Auto off"
time for the unit.
Setting the "Auto on" time
Fig. 19: "Timer" mode
19
Start
Aus
6 Stunden späterZeit einstellen
Start
Off
Set time 6 hours later
REMKO ML...DC
Setting the "Auto off" time
1. Press the "TIMER OFF" key. The remote
control shows "TIMER OFF", the last "Auto
off" time setting and the symbol "H" appears
on the display. The unit is now ready to reset
the "Auto off" time and to stop "TIMER OFF"
mode.
2. Press the "TIMER OFF" key again to set the
desired "Auto off" time. Each time the key is
pressed, the time is increased by half an
hour between 0 and 10 hours, and by an
hour between 10 and 24 hours.
3. Once these settings have been made, there
is a one second delay before the remote control transmits the signal to the indoor unit.
Then, after approx. two seconds, the "H"
symbol disappears from the LCD display,
and the set temperature appears again on
the display.
– When Timer mode is selected, the remote
control automatically transfers the timer
signal to the indoor unit for the specified
period of time. Therefore, you should hold
the remote control in a location where it
can transfer the signal to the indoor unit
without interference.
– The effective operation for the time settings
by the remote control for the timer function
is restricted to the following settings:
0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0,
5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10,
11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23 and 24.
Example TIMER function settings
"TIMER ON" (Auto on mode)
The "TIMER ON" function is useful if you want the
unit to switch on automatically before you come
home. The air conditioning unit will commence
operation automatically at the set time.
Example:
You want the air conditioning unit to switch on six
hours from the time it was programmed.
1. Press the "TIMER ON" key. The last operating time setting for the timer, and the "H"
symbols, appear on the display.
2. Press the "TIMER ON" key until "6.0H" is
shown in the "TIMER ON" area on the
remote control.
3. Wait for three seconds and the temperature
appears again in this area of the digital display. The "TIMER ON" indicator stays lit, and
this function is activated.
Fig. 20: "TIMER ON" example
"TIMER OFF" (Auto off mode)
The "TIMER OFF" function is useful if you want the
unit to switch off automatically once you have gone
to bed. The air conditioning unit will cease operation automatically at the set time.
Example:
You want the air conditioning unit to switch off ten
hours from the time it was programmed.
1. Press the "TIMER OFF" key. The last operating time setting for the timer, and the "H"
symbols, appear on the display.
2. Press the "TIMER OFF" key until "10H" is
shown in the "TIMER OFF" area on the
remote control.
3. Wait for three seconds and the temperature
appears again in this area of the digital display. The "TIMER OFF" indicator stays lit,
and this function is activated.
20
Stop
An
10 Stunden späterZeit einstellen
Stop
On
Set time 10 hours later
Fig. 21: "TIMER OFF" example
An
Zeit
einstellen
Stop
Start
2 Std. später
nach Einstellen
10 Std. später
nach Einstellen
Stop
Start
On
Set time 2 hours later
after setting
10 hours later
after setting
Aus
Zeit
einstellen
Stop
Start
2 Std. später
nach Einstellen
5 Std. später
nach Einstellen
Stop
Start
Off
Set time 2 hours later
after setting
5 hours later
after setting
Combined TIMER (setting "TIMER ON" and
"TIMER OFF" at the same time)
"TIMER OFF ð "TIMER ON"
(On ð Stop ð Start)
This function is useful if you want the unit to switch
off automatically once you have gone to bed, then
to switch back on automatically when you get up or
come home.
Example:
You want the air conditioning unit to switch off in
two hours from the time it was programmed, and
switch back on ten hours later.
1. Press the "TIMER OFF" key.
2. Press the "TIMER OFF" key again until
"2.0H" is shown in the "TIMER OFF" area on
the remote control.
3. Press the "TIMER ON" key.
4. Press the "TIMER ON" key again until "10H"
is shown in the "TIMER ON" area on the
remote control.
5. Wait for three seconds and the temperature
appears again in this area of the digital display. The "TIMER ON" and "TIMER OFF"
indicators stay lit, and this function is activated.
"TIMER ON ð "TIMER OFF"
(Off ð Start ð Stop)
This function is useful if you want the unit to switch
on automatically before you wake up, then to
switch off again once you have left the house.
Example:
You want the air conditioning unit to switch on in
two hours from the time it was programmed, and
switch back off five hours later.
1. Press the "TIMER ON" key.
2. Press the "TIMER ON" key again until "2.0H"
is shown in the "TIMER ON" area on the
remote control.
3. Press the "TIMER OFF" key.
4. Press the "TIMER OFF" key again until
"5.0H" is shown in the "TIMER OFF" area on
the remote control.
5. Wait for three seconds and the temperature
appears again in this area of the digital display. The "TIMER ON" and "TIMER OFF"
indicators stay lit, and this function is activated.
Fig. 23: "TIMER ON" / "TIMER OFF" example
The timer settings ("TIMER ON" or "TIMER
OFF") which is made immediately after the set
time will be activated first.
Fig. 22: "TIMER OFF" / "TIMER ON" example
21
1
REMKO ML...DC
SLEEP function
In this function, the unit automatically increases (in
cooling mode) or reduces (in heat mode) the temperature in the first two hours by 1°C an hour. For
the next five hours, the temperature is them kept
constant. Then this function is stopped.
The function maintains the most comfortable temperature while saving energy.
If the fins are moved to a position which would
influence the cooling or heating effect of the air
conditioning unit, they change their direction of
movement automatically.
Fig. 24: "Sleep" function
The "SLEEP" function is only available in the
"Cooling", "Heating" and "Auto" modes.
Adjusting the airflow direction
Use the "SWING" and "DIRECT" keys to achieve
the desired airflow direction.
1. Press the "DIRECT" key to determine the
horizontal position of the exhaust fins. Each
time the "DIRECT" key is pressed, the fins
change position by 6 degrees.
2. Pressing the "SWING" key causes the
exhaust fins to move up and down automatically.
22
21 5
3 4
5
5.1
n Transport the unit in its original packaging as
n Check the contents of the packaging for com-
n Lift the unit on the corners and not on the
n The refrigerant piping (liquid and suction pipe),
n Select an installation location which allows air
n Do not install the unit in the immediate vicinity
n Only open the shut-off valves on the refrigerant
n Seal off open refrigerant piping with suitable
n Avoid unnecessary bends. This minimises the
n Make special preparations regarding the oil
n Add refrigerant if the basic length of the refrig-
n Perform all electrical wiring in accordance with
n Ensure the electrical cables are properly con-
n Only use the fasteners contained in the scope
n Use four supports and the associated hooks to
n Use the insulated condensate hose in the
Installation instructions for qualified personnel
Important notes prior to installation
close as possible to the installation location.
You avoid transport damage by doing so.
pleteness and check the unit for visible transport damage. Report any damage immediately
to your contractual partner and the shipping
company.
refrigerant or condensate drainage connections.
valves and connections must be insulated to
make them vapour diffusion proof. If necessary
also insulate the condensate drainage line.
to freely flow through the air inlet and outlet
(see section "Minimum clearances")
of devices which generate intensive thermal
radiation. Installation in the vicinity of thermal
radiation reduces the unit output.
piping after installation is complete.
caps or adhesive strips to prevent the infiltration of moisture and never kink or compress
the refrigerant piping.
pressure loss in the refrigerant piping and
ensures that the compressor oil can flow back
without obstruction.
return if the outdoor unit is located above the
indoor unit (see section "Oil return measures").
erant piping exceeds 5 metres. For the quantity
of additional refrigerant, refer to chapter
"Adding refrigerant".
applicable DIN and VDE standards.
nected to the terminals, otherwise there is a
risk of fire.
of delivery with the units.
attach the ceiling cassette (only applies to
ceiling cassettes).
scope of delivery as a junction piece to the
continuing condensate drain. Secure the condensate drain with the supplied clamps.
5.2
Wall openings
n A wall opening of at least 70mm diameter and
10mm incline from the inside to the outside
must be created.
n To prevent damage to the lines, the interior of
the wall opening should be padded or, for
example, lined with PVC pipe (see figure).
n After installation has been completed, use a
suitable sealing compound to close off the wall
opening, taking account of fire protection regulations (responsibility of customer). Do not use
cement or lime containing substances!
Fig. 25: Wall opening
1: Liquid line
2: Control line
3: Condensate drainage line
4: Suction pipe
5: PVC pipe
5.3
Installation materials
The indoor unit is attached to the wall by a wall
bracket and 4 screws (to be provided by the customer).
The outdoor unit is attached by 4 screws and a
wall bracket to the wall or fixed by a floor bracket to
the ground.
23
1
20 cm
1
REMKO ML...DC
Selection of installation
5.4
location
Indoor unit
The indoor unit is designed for horizontal wall
installation above doors. However, it can also be
used in the upper wall area (min. 1.75m above the
floor).
Outdoor unit
The outdoor unit is designed for horizontal installation on a base in outdoor areas. The installation
site must be level, flat and firm. The unit should
also be secured to prevent it from tipping over. The
outdoor unit can be set up outside as well as inside
a building. For external installation, please observe
the following notes to protect the unit from the
influence of the weather.
Rain
For floor or roof set-up, the unit should be installed
with at least 10cm ground clearance. A floor
bracket is available as an optional accessory.
Sun
The condenser on the outdoor unit emits heat.
Exposure to sunlight further increases the temperature of the fins and reduces the heat released by
the finned heat exchanger. The outdoor unit should
be installed on to the north side of the building
whenever possible. If necessary, take measures to
provide sufficient shade (responsibility of customer). One possible solution is to build a small
roofed area over the unit. These measures should
not affect the flow of warm outlet air.
Snow
The unit should be wall-mounted in areas of heavy
snowfall. Installation should be at least 20cm
above the expected level of snow to prevent snow
from entering the outdoor unit. An optional wall
bracket is available as an accessory.
Fig. 27: Minimum clearance to snow
1: Snow
Installation inside buildings
n Ensure that heat can dissipate adequately
when placing the outdoor unit in cellars, lofts,
adjoining rooms or halls (
n Install an additional fan with a rated flow com-
parative to that of the outdoor unit being
installed in the room and which can compensate any additional pressure loss in ventilation
ducts (Fig. 28).
n Comply with any regulations and conditions
affecting the statics of the building. If necessary, fit acoustic installation.
Fig. 28).
Wind
If the unit is being installed in windy areas, ensure
that the warm outlet air is discharged in the prevailing wind direction. If this is not the possible, it
may be necessary to install a windbreak (to be provided by the customer). Ensure that the windbreak
does not adversely affect the air intake to the unit.
Fig. 26: Windbreak
1: Wind
24
2
1
K
3
W
3
Fig. 28: Installation inside buildings
2
1
2
1
A
B
C
D
E
E
C
A
B
F
IT AT
K: Cold fresh air
W: Warm air
1: Outdoor unit
2: Additional fan
3: Air shaft
5.5
Minimum clearances
Observe the minimum clearances to allow access for maintenance and repair work and facilitate optimum air
distribution.
Fig. 29: Minimum clearances of the indoor unit and outdoor unit
AT: Outdoor unit
IT: Indoor unit
1: Air inlet
2: Air outlet
Indoor units Outdoor units
Dimensions
(mm)
ML 263 DC IT-523 DC IT ML 263 DC AT-523 DC AT
A 120 150
B 1500 700
C 120 400
25
D - 150
E 120 200
F 1700 -
2
1
A
B
3
A
D
C
B
A
B
C
D
E
F
G H I
J
REMKO ML...DC
5.6
Oil return measures
If the outdoor unit is installed at a higher level than
the indoor unit, suitable oil return measures must
be taken. Usually, an oil pump bend is installed for
every 2.5 metres of height difference.
Fig. 30: Oil return measures
A: Outdoor unit
B: Indoor unit
1: One oil pump bend in suction pipe to outdoor
unit every 2.5 metres of height difference
2: Radius: 50mm
3: Max. 10m
5.8
Wall bracket for the indoor unit
Connection variants for the
5.7
indoor unit
The following connection variants can be used for
the refrigerant, condensate and control lines.
Fig. 31: Connection variants
A: Outlet on the wall, right
B: Outlet through the wall, right
C: Outlet through the wall, left
D: Outlet on the wall, left
Fig. 32: Mounting points for the wall bracket ML 263 DC IT-523 DC IT (front view, all dimensions in mm)
Unit type / dimensions A B C D E F G H I J
ML 263 DC IT-353 DC IT 400 400 245 195 50 50 60 339 306 95
ML 523 DC IT 470 470 320 265 70 70 55 415 365 105
All dimensions in mm. In each case the diameter of the pipe break-through is Ø 65 mm
The wall bracket for the units must be attached with suitable screws and anchors.
26
6
6.1
The indoor unit is attached by means of a wall
bracket, taking into consideration the air outlet side
located in the lower part.
1. Mark the mounting points on the structurally
2. If necessary, remove the break out opening
3. Connect the refrigerant piping, electrical
4. Hang the indoor unit onto the wall bracket by
5. Check again that the unit is level. (
Installation
Installation of the indoor unit
permissible building sections according to the
dimensions of the wall bracket.
of the housing.
cables and condensate drainage line to the
indoor unit as described below.
tilting it back slightly and by pressing the
bottom part of the unit against the bracket.
Fig. 33)
Connecting the refrigerant
6.2
piping
The refrigerant piping is connected (responsibility
of the customer) on the back side of the units.
It may be necessary to fit a reducer or flared
adapter to the indoor unit. These fittings are
included with the indoor unit as an accessory kit.
Once installed, the connections should be insulated to make them vapour diffusion proof.
NOTICE!
Installation should only be performed by
authorised specialists.
NOTICE!
The unit is factory filled with dry nitrogen for
leak testing purposes. The pressurised
nitrogen is released when the union nuts are
undone.
Fig. 33: Horizontal positioning
The wall bracket for the units must be attached
with suitable screws and anchors.
NOTICE!
Use only tools which are approved for use in
an HVAC environment. (z. B.: bending pliers,
pipe/tubing cutters, de-burrers and flaring
tools). Do not cut refrigerant pipes with a saw.
NOTICE!
All work must be carried out in a way that prevents dirt, particles, water etc. from entering,
refrigerant lines!
27
2
1
REMKO ML...DC
The following instructions describe the installation
of the cooling cycle and the assembly of the indoor
unit and the outdoor unit.
1. The required pipe diameters are given in the
table "Technical data".
2. Install the indoor unit and connect the refrigerant piping as described in the operating
manual for the indoor unit.
3. Use the wall or floor brackets to fit the outdoor unit against structural parts approved to
support the static load (refer to the installation instructions for the brackets).
4. Ensure that structure-borne sound is not
transferred to parts of the building. Use vibration dampers to reduce the effects of structure-borne sound!
5. Lay the refrigerant piping from the indoor unit
to the outdoor unit. Ensure that the fastenings are adequate and if necessary, take
appropriate oil return measures!
6. Remove the factory-fitted protective caps and
union nuts on the connections. These should
be used later in the installation process.
7. Before flanging the refrigerant piping, ensure
that the union nut is fitted on the pipe.
8. Prepare the laid refrigerant pipings as shown
below (Fig. 34 and Fig. 35
9. Verify that the shape of the flange is correct
(Fig. 36).
10. First connect and hand-tighten the refrigerant
piping to ensure it is correctly seated.
11. Then tighten the fittings with 2 appropriatelysized open-ended spanners. Use one
spanner to counter the force when tightening
the fitting (Fig. 37).
12. Use insulation hoses which are designed for
this temperature range and are diffusion
proof.
13. Observe the permitted bending radius for the
refrigerant piping during installation. Never
bend a pipe twice in the same place. Brittleness and cracking can result.
14. Apply appropriate heat insulation to the
installed refrigerant piping, including connector.
15. Take the same action at the shut-off valves
for all subsequent refrigerant piping.
).
Label the refrigerant piping (injection and suction pipes) as well as the associated electrical
control lines of each interior unit with a letter.
Only connect the lines to their associated connections.
NOTICE!
Always pay attention to the affiliation of the
electrical lines and refrigerant piping! The connections of the individual circuits must not be
mixed up. Mixing up the assignment of control
lines and refrigerant piping can have fatal consequences (compressor damage)!
Commissioning of the individual circuits must
be carried out successively.
Fig. 34: Deburring the refrigerant piping
1: Refrigerant piping
2: Deburrer
28
1
Fig. 35: Flanging the refrigerant piping
2
1
1: Flanging tool
Fig. 36: Correct flange shape
Fig. 37: Tightening the fitting
1: Tighten with the first open-ended spanner
2: Counter with the second open-ended spanner
Pipe dimension in
inches
1/4" 15-20
3/8" 33-40
1/2" 50-60
5/8" 65-75
3/4" 95-105
Additional notes on connecting
6.3
the refrigerant piping
n When combining the outdoor unit with some
indoor units, the procedure for connecting the
refrigerant piping may differ. Install the provided reducer or expansion fittings to the
indoor unit.
n If the basic length of the connecting line
exceeds 5m, add refrigerant when commissioning the system for the first time (see
chapter "Adding refrigerant").
Tightening torque in Nm
29
REMKO ML...DC
6.4
Leak testing
Once all the connections have been made, the
pressure gauge station is attached to the Schrader
valve as follows (if fitted):
red = small valve = high pressure
blue = large valve = suction pressure
Once the connection has been made successfully,
the leak test is carried out with dry nitrogen.
Leak testing involves spraying a leak detection
spray onto the connections. If bubbles are visible,
the connections have not been made properly. In
that case, tighten the connection or, if necessary,
create a new flange.
After completing a successful leak test, the excess
pressure in the refrigerant piping is removed and a
vacuum pump with an absolute final partial pressure of min. 10 mbar is used to remove all of the
air and empty the pipes. Any moisture present in
the pipes will also be removed.
NOTICE!
A vacuum of at least 20 mbar must be produced!
6.5
Adding refrigerant
The units contain a basic quantity of refrigerant. In
addition, an additional amount of refrigerant must
be added for refrigerant piping lengths exceeding 5
metres per circuit. Refer to the following chart:
Up to and
incl. 5m
ML 263 DC
0 g/m 30 g/mML 353 DC
ML 523 DC
CAUTION!
Wear protective clothing when handling refrigerant.
DANGER!
Only refrigerant in a liquid state may be used to
fill the cooling cycle!
From 5m to
max. length
The time required to generate the vacuum is
dependent on the final pressure pipe volume of the
indoor units and the length of the refrigerant piping.
However, the process will take at least 60
minutes. Once any foreign gases and humidity
have been completely extracted from the system,
the valves on the pressure gauge station are
closed and the valves on the outdoor unit are
opened as described in the "Commissioning" section.
NOTICE!
Check the overheating to determine the refrigerant fill quantity.
NOTICE!
The escape of refrigerant contributes to climatic change. In the event of escape, refrigerant with a low greenhouse potential has a
lesser impact on global warming than those
with a high greenhouse potential. This device
contains refrigerant with a greenhouse potential of 1975. That means the escape of 1 kg of
this refrigerant has an effect on global warming
that is 1975 times greater than 1 kg CO2,
based on 100 years. Do not conduct any work
on the refrigerant circuit or dismantle the
device - always enlist the help of qualified
experts.
30
7
3
2
4
9
5 5
11
100
6
8
7
10 10
12 12
1
EB
B
A
D
C
11
1
5
5
8
1
9
3
Condensate drainage
connection and safe
drainage
Fig. 39: Dimensions for the strip foundation (bird's
eye view)
For the designations of 1,3,5,8,9 and 11, please
refer to the legend for the Fig. 38
dimensioning of the strip foundation (in mm)
Fig. 38: Condensate drainage, seepage of condensate and strip foundation (cross-section)
1: Outdoor unit
2: Leg
3: Condensate collection tray
4: Floor bracket
5: Reinforced strip foundation
HxWxD = 300x200x800mm
6: Gravel layer for seepage
7: Condensate drainage heating
8: Drainage channel
9: Conduit for refrigerant piping and electrical
connecting line (temperature-resistant up to at
least 60°C)
10: Frost line
11: Drainage pipe
12: Soil
31
Dimension
ML 263 DC AT-523 DC AT
A 800
B 200
C 549
D 276
E 349
Condensate drainage connection
If the temperature falls below the dew point, condensation will form on the finned condenser during
heating mode.
A condensate tray should be installed on the
underside of the unit to drain any condensate.
n The condensate drainage line should have an
incline of min. 2%. This is the responsibility of
the customer. If necessary, fit vapour-diffusionproof insulation.
n When operating the unit at outside tempera-
tures below 4 °C, ensure the condensate
drainage line is laid to protect it against frost.
The lower part of the housing and condensate
tray is also to be kept frost free in order to
ensure permanent draining of the condensate.
If necessary, fit a pipe heater.
n Following installation, check that the conden-
sate run off is unobstructed and ensure that the
line is durably leak tight.
min. 2%
REMKO ML...DC
Fig. 40: Condensate drainage connection - Indoor
unit
Safe drainage in the event of leakages
The REMKO oil separator OA 2.2 fulfils the following list of requirements from regional regulations and laws.
NOTICE!
Local regulations or environmental laws, for
example the German Water Resource Law
(WHG), can require suitable precautions to
protect against uncontrolled draining in case of
leakage to provide for safe disposal of
escaping refrigerator oil or hazardous media.
32
2
1
4
3
1
8
8.1
A protected power supply cable is to be connected
to the outdoor unit and a four-wire control line to
the indoor unit respectively.
Electrical wiring
General Information
DANGER!
All electrical installation work is to be performed by specialist companies. Disconnect
the power supply when connecting the electrical terminals.
WARNING!
All electric lines are in accordance VDE regulations to dimension and to lay.
NOTICE!
Make the connection as follows:
1. Open the air inlet grill.
2. Remove the covers on the right-hand side
(Fig. 41).
3. Disconnect the control line from the terminal
block and remove the control line.
4. Connect the customer-laid control line to the
terminals (Fig. 41).
5. Re-assemble the unit.
The electrical connection for the units must be
made at a separate feedpoint with a residual
current device in accordance with local regulations and should be laid out by an electrician.
We recommend using shielded wires for the
control lines.
Check all plugged and clamped terminals to
verify that they are seated correctly and make
permanent contact. Tighten as required.
8.2
Connecting the indoor unit
n We recommend that a mains/repair switch be
installed near the outdoor unit.
n The terminal blocks for making the connections
are located at the rear of the unit. When the
unit is installed, measurements can be made
from the front by removing the cover.
n If an optional condensate pump is used as an
accessory in conjunction with the unit, it may
be necessary to install an additional relay with
a higher contact rating after the switch-off contact on the pump to switch off the compressor.
Fig. 41: Connecting the indoor unit
1: Cover
2: Strain relief
3: Terminal block for control line
4: Control line from outdoor unit
33
230V/1~/50 Hz
L N PE L(1) 1 2(N) S L(1) 1 2(N) S
BA
1
2
REMKO ML...DC
8.3
Connecting the outdoor unit
Proceed as follows to connect the line:
1. Remove the side-panel cover.
2. Choose a cable-section according to the rele-
vant specifications.
3. Connect the lines as shown on the electrical
connection diagram.
8.4
Electrical wiring diagram
Connection ML 263 DC-523 DC
4. Fix the line in the strain relief and re-
assemble the unit.
Fig. 42: Connecting the outdoor unit
Fig. 43: Electrical wiring diagram
A: Outdoor unit ML 263 DC AT-523 DC AT
B: Indoor unit ML 263 DC IT-523 DC IT
1: Power supply
2: Communication line
34
Connecting of optional condensate pump KP 6 / KP 8
L N PE
L N PE
L(1) 1 2(N) S
L(1) 1 2(N) S
L
N
WH
BK
A
B
C
1
2
3
Fig. 44: Electrical wiring diagram
A: Outdoor unit
B: Indoor unit
C: Condensate pump KP 6 / KP 8
1: Power supply
2: Supply condensate pump
3: Fault contact condensate pump
BK: black
WH: white
35
3
4
CE-KFR26G/BP3N1Y-11M.D.11.NP2-1
202302130849
L_IN
CN10
CN11
CN5
CN9
CN8
L_OUT
SW1
CN4
CN6
CN16
3
D
A
4
2
1
B
C
5
REMKO ML...DC
8.5
Electrical drawings
Indoor unit ML 263 DC IT
Fig. 45: Electrical drawings
A: Connection to terminal block, power supply and
supply to the indoor unit (contact 1)
B: Connection to terminal block, power supply and
supply to the indoor unit (contact L (1))
C: Connection to terminal block, power supply and
supply to the indoor unit (contact 2 (N))
D: Connection to terminal block, power supply and
supply to the indoor unit (contact S)
1: Display
2: Probe air inlet
3: Probe suction pipe
4: Swing motor
5: Evaporator fan motor / Evaporator fan board
36
Indoor unit ML 353 DC IT
3
4
CE-KFR26G/BP3N1Y-11M.D.11.NP2-1
202302130860
L_IN
CN10A
CN11
CN16
CN5
CN4
CN9
CN8
L_OUT
SW1
3
5
A
4
2
1
B
C
D
Fig. 46: Electrical drawings
A: Connection to terminal block, power supply and
supply to the indoor unit (contact 1)
B: Connection to terminal block, power supply and
supply to the indoor unit (contact L (1))
2: Probe air inlet
3: Probe suction pipe
4: Swing motor
5: Evaporator fan motor
C: Connection to terminal block, power supply and
supply to the indoor unit (contact S)
D: Connection to terminal block, power supply and
supply to the indoor unit (contact 2 (N))
1: Display
37
3
4
CE-KFR26G/BP3N1Y-11M.D.11.NP2-1
202302130860
L_IN
CN10A
CN11
CN16
CN5
CN4
CN9
CN8
L_OUT
SW1
3
5
A
4
2
1
B
C
D
REMKO ML...DC
Indoor unit ML 523 DC IT
Fig. 47: Electrical drawings
A: Connection to terminal block, power supply and
supply to the indoor unit (contact 1)
B: Connection to terminal block, power supply and
supply to the indoor unit (contact L (1))
C: Connection to terminal block, power supply and
supply to the indoor unit (contact S)
D: Connection to terminal block, power supply and
supply to the indoor unit (contact 2 (N))
1: Display
2: Probe air inlet
3: Probe suction pipe
4: Swing motor
5: Evaporator fan motor
38
Outdoor unit ML 263 DC AT
3
4
CN19
CN6
CN8
CN7
CN4
CN14
CN100
CN2
CN12
CN11
CN16
CN18
CN13
CN15
CN3
CN10
CN5
4
5
2
6
7
C
A B1
3
Fig. 48: Electrical drawings
A: Connection to terminal block, indoor unit (con-
tact L(1))
B: Connection to terminal block, supply (contact
S)
C: Connection to terminal block, supply and indoor
3: Inductor
4: Condenser fan
5: 4-way valve
6: Heater 1 (optional)
7: Heater 2 (optional)
unit (contact N und 2(N))
1: Probe heat gas , probe outside air, probe con-
denser outlet
2: Compressor
39
X
CN302
CN303
CN8
CN10
CN11
CN301
CN13
CN12
CN15
3
4
CN401
CN400
CN9
CN104
CN103
CN102
CE-KFR26W/BP3(PFC).D.13.WP2-1 202302130906
CN5
CN4
CN7 CN6
5
8
4
7
B CA
2
3
1
6
REMKO ML...DC
Outdoor unit ML 353 DC AT
Fig. 49: Electrical drawings
A: Connection to terminal block, power supply and
supply to the indoor unit (contact L (1))
B: Connection to terminal block, power supply and
supply to the indoor unit (contact N und 2(N))
C: Connection to terminal block, power supply and
supply to the indoor unit (contact S)
1: Heater 2 (optional)
2: Heater 1 (optional)
3: 4-way valve
4: Condenser fan
5: Probe heat gas
6: Probe outside air, probe condenser
7: Inductor
8: Compressor
40
Outdoor unit ML 523 DC AT
X
CN302
CN303
CN8
CN10
CN11
CN301
CN13
CN12
CN15
3
4
CN401
CN400
CN9
CN104
CN103
CN102
CN100
CE-KFR26W/BP3(PFC).D.13.WP2-1 202302130906
CN5
CN6
5
8
4
7
B CA
2
3
1
6
Fig. 50: Electrical drawings
A: Connection to terminal block, power supply and
supply to the indoor unit (contact L (1))
B: Connection to terminal block, power supply and
supply to the indoor unit (contact N und 2(N))
C: Connection to terminal block, power supply and
4: Condenser fan
5: Probe heat gas
6: Probe outside air, probe condenser
7: Inductor
8: Compressor
supply to the indoor unit (contact S)
1: Heater 2 (optional)
2: Heater 1 (optional)
3: 4-way valve
41
REMKO ML...DC
9
After leak testing has been successfully completed, connect the vacuum pump via the pressure
gauge station to the valve connections on the outdoor unit (see chapter "Leak testing") and create a
vacuum.
Perform the following checks prior to putting the
unit into operation for the first time and after any
work on the cooling cycle. Record the results in the
commissioning report:
n Check all refrigerant piping and valves for leak-
n Check the refrigerant piping and insulation for
n Check the electrical connection between the
n Check that all fastenings, mountings, etc. are
10
Before commissioning
tightness using leak detection spray or soapy
water.
damage.
indoor unit and the outdoor unit for correct
polarity.
firm and at the correct level.
Commissioning
n Check of the surface temperature of the suc-
tion pipe and that the vaporiser is not overheating. To measure the temperature, hold the
thermometer to the suction pipe and subtract
the boiling point temperature reading on the
pressure gauge from the measured temperature.
n Record the measured temperatures in the
commissioning report.
NOTICE!
Commissioning should only be performed by
specially trained personnel and documented
after the certificate has been issued. Observe
the operating manuals for the indoor unit and
outdoor unit when commissioning the entire
system.
Once all the components have been connected
and tested, the system can be put into operation. A
functional check should be performed to verify its
correct function and identify any unusual operating
behaviour prior to handing it over to the operator.
NOTICE!
Check that the shut-off valves and valve caps
are tight after carrying out any work on the
cooling cycle. Use appropriate sealant products as necessary.
Functional checks and test run
Check the following points:
n Leak-tightness of the refrigerant piping.
n Compressor and fan running smoothly.
n In cooling mode, cold air output by the indoor
unit, and warm air output by the outdoor unit.
n Function test of the indoor unit and all program
sequences.
42
Function test of the cooling and heating modes
1. Remove the protective caps from the valves.
2. Start the commissioning procedure by briefly
opening the shut-off valves on the outdoor
unit until the pressure gauge indicates a
pressure of approx. 2 bar.
3. Check all connections for leaks with leak
detection spray and suitable leak detectors.
4. If no leaks are found, fully open the shut-off
valves by turning them anti-clockwise using a
spanner. If leaks are found, remedy the faulty
connection. It is imperative that the vacuum
creation and drying steps are repeated.
5. Activate the main circuit breaker or fuse (to
be provided by the customer).
6. Press the test knob on the outdoor unit and
wait until a frequency of min. 50 Hz is established.
7. Use the remote control to switch on the unit
and select the cooling mode, maximum fan
speed and lowest target temperature.
8. Check the overheating, outside, inside, outlet
and vaporisation temperatures and record
the measured values in the commissioning
report. Check the correct function and settings of all regulation, control and safety
devices.
9. Check the unit control system using the func-
tions described in the chapter "Operation".
Timer, temperature setting, fan speeds and
switching to ventilation or dehumidification
mode.
10. Check the correct function of the condensate
drainage by pouring distilled water into the
condensate tray. A bottle with a spout is recommended for pouring the water into the
condensation tray.
11. Switch the indoor unit to heating mode.
12. During the test run, check the functionality of
all of the previously described safety devices.
13. Record the measured values into the com-
missioning report and familiarise the operator
with the system.
14. Remove the pressure gauge. Check that
seals have been fitted in the sealing caps.
15. Re-install all disassembled parts.
43
REMKO ML...DC
11
11.1
The unit and components are manufactured using state-of-the-art production methods and tested several
times to verify their correct function. However, if alarms should occur, please check the functions as detailed
in the list below. For systems with an indoor unit and outdoor unit, refer to the chapter "Troubleshooting and
customer service" in both operating manuals. Please inform your dealer if the unit is still not working correctly
after all function checks have been performed!
Operational malfunctions
Malfunction Possible causes Checks Remedial measures
Troubleshooting, fault analysis
Troubleshooting and customer service
Power failure, undervoltage, defective mains
fuse / main switch in
OFF position
Damaged power supply Does all other elec.
Wait time after switching
on is too short
and customer service
Does all other electrical
equipment function correctly?
equipment function correctly?
Have approx. 5 minutes
elapsed since the
restart?
Check the voltage and if
necessary, wait for it to
come back on.
Repair by specialist firm
Schedule longer wait
times
The unit does not start or
switches itself off.
The unit does not
respond to the remote
control
Temperature outside
operating range.
Electrical surges caused
by thunderstorms
Malfunction of the
external condensate
pump
High-pressure / low-pressure switches have triggered
Transmission distance
too far / receiver affected
by interference
Defective remote control Is the unit running in
Receiver or transmitter
unit exposed to excessive solar radiation
Electromagnetic fields
are interfering with transmission
Are the fans in the indoor
unit and outdoor unit
working correctly?
Have there been lightning strikes in the area
recently?
Has the pump shut down
due to a malfunction?
Check refrigerant pressure and look for leaks if
necessary
Does the indoor unit
beep when pressing a
key?
manual mode?
Does it function correctly
in the shade?
Does it function after
removing potential
sources of interference?
Observe temperature
ranges of indoor unit and
outdoor unit
Switch off the mains
breaker and switch it
back on. Have it
inspected by a specialist
Check and if necessary
clean the pump
Rectify leakage and restart
Reduce the distance to
less than 6 m or change
position
Replace the remote control
Place the receiver and/or
transmitter unit in the
shade
Signal is not transmitted
when interference
sources are operational
Key in remote control
jammed / two buttons
pressed at same time
Does the “Transmitting”
symbol appear on the
display?
Release the key / only
press one key
44
Malfunction Possible causes Checks Remedial measures
The unit is running but
only provides reduced or
no cooling or heating
capacity.
Batteries in remote control are flat
Filter is dirty / air inlet /
outlet opening is blocked
by debris.
Windows and doors
open. Heating / cooling
load has increased
Neither cooling nor
heating mode has been
set
Fins on outdoor unit
blocked by foreign
objects
Leaking cooling cycle Are there signs of frost
Outdoor unit iced up Check outdoor unit. Has
Have new batteries been
inserted? Is the display
incomplete?
Have the filters been
cleaned?
Have structural / usage
modifications been
made?
Does the cooling symbol
appear on the display?
Does the fan of the outdoor unit work? Are the
exchanger fins unobstructed?
on the exchanger fins of
the indoor unit?
the cassette probe on
the outdoor unit been
correctly positioned?
Insert new batteries
Clean the filters
Close windows and
doors / install additional
units
Correct the settings for
the unit
Check the fan or winter
fan speed control,
reduce the air resistance
Repair by specialist
De-ice and fit the probe
at the point where the
most ice forms
Condensate discharge
on unit
Drainage pipe on collection container clogged /
damaged
Faulty external condensate pump or float
Condensate has not
drained away and has
collected in the condensate drainage line
Condensate does not
drain off
Float is stuck or jammed
due to excessive dirt.
Can the condensate
drain off without any
obstruction?
Is the collection tray full
of water and the pump
not running?
Is there an incline on the
condensate drainage
line? Check there is no
blockage in the pipe.
Are the condensate
drainage lines unblocked
and is there a steady
incline? Are the condensate pump and liquid
level switch functioning
correctly?
Are the LEDs on the
receiver unit of the
indoor unit flashing?
Clean the drainage pipe
and collection container
Call out a specialist to
replace the pump
Ensure there is an incline
when laying the condensate drainage line and
clean the pipe.
Route the condensate
drainage line with an
incline and clean it. If the
liquid level switch or the
condensate pump is
defective, have them
replaced.
Should be cleaned by
specialist firm
45
YES
NO
YES
REMKO ML...DC
Fault indicated on indoor unit
Display Cause Required action
E0 EEPROM error Contact specialist dealer
E1
E2 Wiring fault L/N/Pe/S Check wiring, replace IT circuit board
E3 Defective speed monitoring, evaporator fan Check wiring, check motor voltage
E4
E5
EC Refrigerant loss / leak
F1
F2 Condenser probe defective / short-circuited Check wiring, contact specialist company
F3 Heat gas line probe defective / short-circuited Check wiring, contact specialist company
F4 EEPROM fault, outdoor unit Contact specialist dealer
F5 Defective speed monitoring, condenser fan Check wiring, check motor voltage
P0 IPM power board safety shutdown
Communication fault between outdoor unit and
indoor unit
Evaporator inlet temperature probe defective /
short-circuited
Evaporator suction pipe probe defective /
short-circuited
Outside temperature probe defective / shortcircuited
Disconnect from mains for 2 min, check electrical wiring
Check wiring, contact specialist company
Check wiring, contact specialist company
Check refrigerant pressure, check system for
leaks
Check wiring, contact specialist company
Check wiring, switch off and on again, contact
specialist company
P1 Overvoltage/undervoltage protection
P4 Inverter board fault
11.2
Fault E0: EEPROM error
Switch the unit off for 5 seconds. Is the fault still
Is the EEPROM chip properly seated on the cir-
Indoor unit fault analysis
shown on the display?
cuit board?
Replace the indoor unit circuit board.
Check voltage on the L/N/S system. Switch
system off and on again
Switch system off and on again, replace
inverter board
Insert the chip properly.
46
Fault E1: Communication error between outdoor and indoor unit
YES
YES
NO
YES YES
YES
NO
NO
YES
Switch the unit off for 5 seconds. Is the fault still
shown on the display?
Check all connecting lines between the indoor
unit and the outdoor unit and check that the
connections to the circuit boards comply with
the circuit diagram. Are all cables properly con-
nected?
Measure the voltage on the S and N terminals
of the outdoor unit. Is +24 V present on these?
Has the wiring to the outdoor unit been cor-
rectly implemented?
Replace the outdoor unit motherboard.
Has the wiring to the indoor unit been correctly
implemented?
Replace the indoor unit control board.
Has the fault cleared?
Fault E2: Phase monitoring has tripped
Is all cabling correctly connected and is the
supply voltage present at the outdoor unit?
The indoor unit control board is defective.
Please replace.
Renew all electrical connections if necessary.
47
NO
YES
NO
YES YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
REMKO ML...DC
Fault E3: Fan speed incorrect
Switch the unit off
for 5 seconds. Is the
fault still shown on
the display?
Switch the unit off.
Check whether the
fan rotor can be
turned easily by
hand.
Check all electrical
connections to the
motor. Are these
correctly imple-
mented?
Replace the con-
nections.
The unit operates normally.
Check the bearing between the fan rotor
and the fan motor. Is it OK?
Replace the fan
motor
Replace the
bearing.
Check the resist-
ance of the motor. Is
this normal?
The indoor unit con-
trol board is defec-
tive. Please replace.
Faults E3-E4 and F1-F3: Probe fault
Check the connection of the respective probe to
the circuit board. Are these correctly imple-
mented?
Measure the resistance of the respective probe.
Use the table for comparison. Does the probe
resistance match the value in the table?
Replace the fan
motor
Establish a proper connection.
Probe defective. Please replace.
Replace the respective control board.
48
Fault EC: No cooling performance or heating performance after 30 minutes
YES
YES
NO YES
YES
NO
YES
NO
YES
NO
YES
NO
YES
YES
Switch the unit off for 5 seconds. Is the fault still
shown on the display?
Is the indoor unit blowing out cold air or warm
air?
Check all pipe connections for leak-tightness. Is
there a deficit of refrigerant?
Are the pipelines kinked or perhaps contami-
nated?
Replace the pipelines.
Check the probe on the evaporator (T2). Is this
correctly seated?
Replace the indoor unit circuit board.
Rectify the leak and fill with new refrigerant.
Fault P0: Inverter module fault
Check the electrical wiring between the circuit
board and the compressor. Is this correctly
implemented?
Check whether the IPM module is correctly
installed.
Does the condenser fan run properly?
Replace the outdoor unit motherboard. Is the
fault still present?
Replace the compressor.
Replace the connections.
Correct the installation and retighten all
screwed connections.
Check the connection of the condenser fan
motor or replace it if necessary.
49
NO
YES
NO
YES
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
REMKO ML...DC
Fault P1: Overvoltage/undervoltage protection AT tripped
Check whether the power supply is present and
correct. Is this normal?
Check all electrical connections. Are they OK?
Check the voltage between the P and N termi-
nals of the outdoor unit. This should be approx.
320V DC. Is this voltage present?
Replace the outdoor unit motherboard.
Fault P2: Excessive temperature at the compressor
Check the indoor unit and outdoor unit heat
exchangers for cleanliness. Is the air exchange
guaranteed?
Switch the supply and try again as soon as this
is normal again.
Correct the electrical connections.
Clean the respective heat exchanger.
Switch the unit off for 10 minutes. Check
whether the unit starts up again normally.
Check the fill level of the refrigerant. Is this cor-
rect?
Refrigerant cannot circulate. Possibly due to
internal contamination or kinked lines.
Fault P3: Overcurrent protection on the compressor
Check all electrical connections. Are these cor-
rectly implemented?
Check the compressor windings. Are they OK?
Check all electrical connections and the heat
gas probe T5.
Check the unit for leaks and fill with new refrig-
erant.
Replace the connections.
Replace the compressor.
50
Resistance values for probes T1, T2, T3 and T4
W
T
T5
T1, T2, T3, T4
Temperature
(°C)
Resistance value
(kW)
Resistance values for probe T5
Temperature
(°C)
Resistance value
(kW)
Progression - temperature / resistance
5 10 15 20 25 30 40 50 60
26.9 20.7 16.1 12.6 10.0 8.0 5.2 3.5 2.4
5 15 25 35 60 70 80 90 100
141.6 88 56.1 36.6 13.8 9.7 6.9 5.0 3.7
Fig. 51: Progression - temperature / resistance
W: Resistance (kW)
T: Temperature (°C)
51
REMKO ML...DC
12
Regular care and observation of some basic points
will ensure trouble-free operation and a long
service life.
Prior to performing any work, ensure the equipment is disconnected from the voltage supply
and secured to prevent accidental switch-on!
Care
n Ensure the unit is protected against dirt, mould
and other deposits.
n Only clean the unit using a damp cloth. Do not
use any caustic, abrasive or solvent-based
cleaning products. Do not use a jet of water.
n Clean the fins on the unit prior to long shut-
down periods.
Care and maintenance
DANGER!
Maintenance
n It is recommended that you take out a mainte-
nance contract with an annual service from an
appropriate specialist firm.
This enables you to ensure the operational reliability of the plant at all times!
NOTICE!
Statutory regulations require an annual leak
test for the cooling cycle dependant on the
refrigerant quantity. Inspection and documentation of the work performed is to be carried out
by specialist technicians.
Type of task
Checks/maintenance/inspection
General
Check voltage and current
Check function of compressor/fans
Dirt on condenser/evaporator
Check refrigerant fill quantity
Check condensate drainage
Check insulation
Check moving parts
Sealing test for cooling cycle
1)
See note
Commis-
sioning
l
l
l
l l
l
l
l
l
l
Monthly Every 6
months
l
l
Yearly
l
l
l
l
l
1)
l
52
Cleaning the housing
1. Disconnect the power supply to the unit.
2. Open and fold the air inlet grill on the front
side upwards.
3. Clean the grill and cover with a soft, damp
cloth.
4. Switch the power supply back on.
Air filter for indoor unit
Clean the air filter at intervals of no more than 2
weeks. Reduce this interval if the air is especially
dirty.
Cleaning the filter
1. Disconnect the power supply to the unit.
2. Open the front side of the unit by folding the
grill upwards and allowing it to engage
(Fig. 52).
3. Raise the filter and pull it out in a downwards
direction (Fig. 52).
4. Clean the filter with a commercially available
vacuum cleaner (Fig. 53
dirty side so it is facing upwards.
5. Dirt can also be removed by carefully
cleaning with lukewarm water and mild
cleaning agents (
should be face down.
6. If water is used, let the filter dry out properly
in the air before fitting it back into the unit.
Fig. 54). The dirty side
). To do so, turn the
Fig. 52: Folding the grill upwards
Fig. 53: Cleaning with a vacuum cleaner
7. Carefully insert the filter. Ensure that it
locates correctly.
8. Close the front side as described above in
reverse order.
9. Switch the power supply back on.
10. Switch the unit back on.
Cleaning the condensate pump (accessories)
The indoor unit may contain an optional integrated
or separate condensate pump, which pumps out
any accumulated condensate into higher positioned drains.
Observe the care and maintenance instructions in
the separate operating manual.
Fig. 54: Cleaning with lukewarm water
53
REMKO ML...DC
13
Temporary shutdown
1. Let the indoor unit run for 2 to 3 hours in
2. Shut down the system using the remote con-
3. Switch off the electrical power supply to the
4. Cover the unit as far as possible with plastic
Permanent shutdown
Ensure that units and components are disposed of
in accordance with local regulations, e.g. through
authorised disposal and recycling specialists or at
collection points.
REMKO GmbH & Co. KG or your contractual
partner will be pleased to provide a list of certified
firms in your area.
Shutdown
recirculation mode, or in cooling mode at
maximum temperature, to extract any
residual humidity from the unit.
trol.
unit.
foil in order to protect it from the influences of
weather.
54
14
14.1
Exploded view and spare parts lists
Exploded view - Indoor unit
Fig. 55: Exploded view of the unit ML 263 DC IT-523 DC IT
We reserve the right to modify the dimensions and design as part of the ongoing technical development
process.
55
REMKO ML...DC
14.2
Please contact REMKO GmbH & Co. KG directly to order spare parts. All of the spare parts numbers for your
unit can be found in the download area at www.remko.de.
No. Designation ML 263 DC IT ML 353 DC IT ML 523 DC IT
1 Front panel, complete
2 Air filter, set
3 Circuit board, display
4 Swing motor
5 Air exhaust fins, set
6 Condensate tray
7 Evaporator
8 Fan wheel
9 Fan motor
10 Control board
11 IR remote control
Spare parts list - Indoor unit
On request by providing the serial number
12 Ambient air probe
13 Evaporator probe
To ensure the correct delivery of spare parts, please always the device type with the corresponding serial
number (see type plate)
56
14.3
Exploded view - Outdoor unit
Fig. 56: Exploded view of the unit ML 263 DC AT-523 DC AT
We reserve the right to modify the dimensions and design as part of the ongoing technical development
process.
57
REMKO ML...DC
14.4
Please contact REMKO GmbH & Co. KG directly to order spare parts. All of the spare parts numbers for your
unit can be found in the download area at www.remko.de.
No. Designation ML 263 DC AT ML 353 DC AT ML 523 DC AT
1 Front panel
2 Fan blade, condenser
3 Fan motor, condenser
4 Condenser
5 Cover panel
6 Side panel
7 Compressor, cpl.
8 Shut-off valve, suction pipe
9 Shut-off valve, liquid pipe
10 Reversing valve
11 E-box, cpl. (incl. control board)
Spare parts list - Outdoor unit
On request by providing the serial number
12 Choke
13 Temperature probes, set
Spare parts not illustrated
Crankcase heating
Condensate tray heating
To ensure the correct delivery of spare parts, please always the device type with the corresponding serial
number (see type plate).
On request by providing the serial number
58
15
A
Alarms
Assembly
C
Care and maintenance....................................... 52
Cleaning
Condensate drainage connection and safe
drainage............................................................. 31
Connecting of optional condensate pump ......... 35
Customer service............................................... 44
D
Disposal of equipment......................................... 7
E
Electrical drawings............... 36, 37, 38, 39, 40, 41
Electrical wiring.................................................. 33
Electrical wiring diagram.................................... 34
Environmental protection..................................... 7
Exploded view of the unit............................. 55, 57
F
Fault indicated on indoor unit............................. 46
Functional checks.............................................. 42
Function test of the cooling and heating modes 43
I
Infrared remote control....................................... 15
Installation location, selection............................ 24
Installation materials.......................................... 23
Intended use........................................................ 6
K
Keys on the remote control................................ 16
M
Maintenance...................................................... 52
Manual mode..................................................... 15
Minimum clearances.......................................... 25
O
Oil return measures........................................... 26
Operation
Index
Checks.......................................................... 44
Possible causes............................................ 44
Remedial measures...................................... 44
Strip foundation............................................. 31
Air filter for indoor unit .................................. 53
Condensate pump
Housing......................................................... 53
Infrared remote control.................................. 15
Manual.......................................................... 15
........................................ 53
Ordering spare parts.................................... 56, 58
P
Performance charts
Cooling.............................................. 11, 12, 13
Heating.............................................. 11, 12, 13
Propellant in accordance with Kyoto Protocol...... 9
R
Remote control
Keys.............................................................. 16
S
Safe drainage in the event of leakages.............. 32
Safety
Dangers of failure to observe the safety
notes............................................................... 5
General........................................................... 5
Identification of notes...................................... 5
Notes for inspection........................................ 6
Notes for installation....................................... 6
Notes for maintenance.................................... 6
Personnel qualifications.................................. 5
Safety-conscious working............................... 5
Safety notes for the operator.......................... 6
Unauthorised modification ............................. 6
Unauthorised replacement part manufacture.. 6
Selection of installation location......................... 24
Shutdown
Permanent.................................................... 54
Temporary..................................................... 54
Spare parts list............................................. 56, 58
T
Test run.............................................................. 42
Troubleshooting and customer service.............. 44
U
Unit installation................................................... 27
W
Wall opening...................................................... 23
Warranty.............................................................. 6
59
REMKO ML...DC
60
61
REMKO ML...DC
62
Consulting
Thanks to intensive training,
our consultants are always
completely up-to-date in terms
of technical knowledge. This has
given us the reputation of being
more than just an excellent,
reliable supplier:
REMKO, a partner
helping you find solutions to
your problems.
Distribution
REMKO offers not just a well
established sales network both
nationally and internationally, but
also has exceptionally highlyqualified sales specialists.
REMKO field staff are more than
just sales representatives: above
all, they must act as advisers to
our customers in air conditioning
and heating technology.
SFlbCustomer Service
Our equipment operates
precisely and reliably. However,
in the event of a fault, REMKO
customer service is quickly at
the scene. Our comprehensive
network of experienced dealers
always guarantees quick and
reliable service.
REMKO INTERNATIONAL
… and also right in your neighbourhood!
Make use of our experience and advice
We reserve the right to make technical changes, and provide no guarantee as to the accuracy of this data!
REMKO GmbH & Co. KG
Air conditioning and heating technology
Im Seelenkamp 12 D-32791 Lage
Postfach 1827 D-32777 Lage
Telephone +49 5232 6 06-0
Telefax +49 52 32 606-260
E-mail info@remko.de
Website www.remko.de
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