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Edition GB – T07
REMKO ML
ML 261, ML 351, ML 521, ML 681
Wall-mounted split design air conditioning unit
Operation · Technology · Spare parts
Contents
Carefully read this operating manual prior to commissioning or
using the equipment!
This manual is an integral part of the unit and must be stored at the
installation location or in the immediate vicinity.
Subject to modifications; No liability accepted for errors or misprints!
Safety notes
4
Environmental protection and recycling
4
Warranty
4
Transportation and packaging
5
Description of the equipment
5
Operation
6-12
Shutdown
12
Care and maintenance
12-13
Troubleshooting and customer service
14-15
Installation instructions for qualified personnel
15-18
Installation
18-19
Tightness check
20
Condensation connection
20
Electrical connection
20-21
Electrical connection diagram
21
Electrical circuit diagram
22
Before commissioning
23
Adding refrigerant
23
Commissioning
23-24
Unit dimensions
24
Exploded view
25-26
Spare parts list
25-26
Technical data
27
Made by REMKO
3
Safety notes
Disposal of packaging
All products are carefully packaged
using environmentally friendly
materials prior to transportation.
Make a valuable contribution to
reducing waste and sustaining
raw materials. Only dispose of
packaging at approved collection
points.
Disposal of
old equipment
Equipment manufacture is subject
to continuous quality control. Only
high-quality materials are used, the
majority of which can be recycled.
Help protect the environment by
only disposing of old equipment in
accordance with local regulations
and in an environmentally safe
manner, e.g. through authorised
disposal and recycling specialists or
at collection points.
Warranty
In order to make warranty claims,
it is essential that the the ordering
party or their representative
complete and return the "certificate
of warranty" and commissioning
report to REMKO GmbH & Co. KG
at the time when the equipment
was purchased and commissioned.
The warranty conditions are
detailed in the "General terms
and conditions“. The contractual
parties can also agree additional
terms beyond the scope of the
above. In this case, first contact the
contractual partner.
Environmental
protection
and recycling
Carefully read this manual before
starting the unit for the first time. It
contains useful tips and notes as
well as hazard warnings to prevent
injury or material damage . Non-
observance of this manual may
endanger persons, the environment
as well as the equipment itself and
will void any claims for liability.
Store this manual and the
refrigerant datasheet in the
vicinity of the unit.
The unit should only be set
up and installed by qualified
personnel.
The setup, connection and
operation of the unit and
its components must be in
accordance with the operating
conditions stipulated in this
manual and comply with all
applicable local regulations.
Units designed for mobile use
should be safely set up on a
suitable floor and in a vertical
position. Units designed for
stationary use should only be
operated in their permanently
installed state.
It is prohibited to make
modifications or changes to
equipment or components
supplied by REMKO as this may
cause malfunctions.
Equipment and components
should not be operated in areas
where there is a heightened
damage risk. Observe the
minimum clearances.
The electrical supply should
be adapted to fulfil the
requirements of the unit.
The operational safety of
equipment and components is
only assured providing they are
used as intended and in a fully
assembled state. Safety devices
should not be modified or
bypassed.
Do not operate equipment
or components with obvious
defects or signs of damage.
All housing parts and openings,
e.g. air inlets and outlets, must
not be blocked by foreign items,
fluids or gases.
The equipment and components
must be kept a safe distance
from inflammable, explosive,
combustible, agressive and dirty
areas or atmospheres.
Persons coming into contact
with equipment parts may suffer
burns or injury.
Installation, repair and
maintenance work should only
be carried out by authorised
specialists. Inspection and
cleaning can be performed
by the operator providing the
equipment is not under voltage.
Take appropriate hazard
prevention measures when
performing installation, repair or
maintenance work or cleaning
the equipment.
The equipment and components
should not be exposed to any
mechanical stresses, extreme
levels of humidity or direct
exposure to sunlight.
REMKO ML
4
The ML 261-681 air conditioning
equipment consists of an REMKO
ML...AT outdoor component and
an ML...IT interior unit.
The outdoor component serves to
output the heat extracted by the
interior unit from the room being
cooled.
In heating mode, the interior unit
dissipates the heat extracted by
the outdoor component.
The outdoor component can be
installed outdoors or indoors. The
latter requires the fulfilment of
certain conditions. The indoor unit
is designed for interior use and
should be mounted high up on a
wall. It is operated by an infrared
remote control.
The outdoor component comprises
a refrigerant and compressor,
liquefier with fins, liquefier
fan, reverse flow fan and flow
regulator. The outdoor component
is controlled by the regulator in the
indoor unit.
The indoor unit comprises a finned
vaporiser, vaporiser fan, controller
and condensation tray.
Winter controllers, floor and wall
brackets, refrigerant pipes and
condensation pumps are also
available as accessories.
Description of the
equipment
The equipment was shipped in
sturdy packaging. Immediately
check the equipment on delivery
and make a note of any damage or
missing parts on the delivery note.
Inform the forwarding agent and
contractual partner.
Warranty claims at a later date will
not be accepted.
Transportation and
packaging
Schematic of refrigerant circuit in indoor unit
Vaporiser fan
Connection to
suction pipe
Connection to injection pipe
Vaporiser
Refrigerant pipes are used to connect the indoor unit to the outdoor
component.
Outdoor
component
System layout
Injection pipe
Indoor unit
Indoor area
Outdoor area
Stop valve
Liquefier fan
Condensation pipe
Suction pipe
Condensation pipe
Control cable
Mains cable
M
M
Schematic of exterior refrigerant circuit
Liquefier fan
Connection valve
Suction pipe
Connection valve
Injection pipe
Compressor
Capillary tube flow regulatorFilter dryerLiquefier
Reverse flow valve
Connection for
pressure gauge
5
Display on indoor unit
The display is lit according to the settings.
max. 6 m
Max. distance 6 m
Display on indoor unit
Timer
Automatic mode
Fan speed
Display
Used to display
coded error
messages, room and
target temperature
Cooling
mode
Swing mode
Sleep function
Dehumidifying mode
Unit of temperature
Heating mode
Operation
Infrared remote control
The infrared remote control can
send the programmed settings
from a distance of 6 m to the
receiver on 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.
First of all, insert the batteries
(two type AAA) supplied with
the remote control. Remove the
cover on the battery compartment
and insert the batteries. Take into
account the correct polarity (see
markings).
The indoor unit is easy to operate using an infrared remote control. This is supplied as standard. The indoor unit
beeps to acknowledge the correct transmission of data. If it is not possible to program the indoor unit using the
remote control, it can also be manually operated.
Errors are displayed in
coded format
(see chapter on trouble-
shooting and customer service)
CAUTION
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 long
periods
NOTE
Manual operation
The indoor unit can also be
started manually. Open the air inlet
guard. Press the button behind the
guard to activate automatic mode.
The following settings apply to
manual mode:
Cooling mode: last setting
Fan speed: AUTO
Heating mode : last setting
Fan: AUTO
Pressing any button on the infrared
remote control interrupts manual
operation.
Help save on energy consump-
tion in stand-by mode! If the
device, system or component
is not in use, we recommend
disconnecting the power sup-
ply. Components with a safety
function is excluded from our
recommendation!
TIP
REMKO ML
6
"TIMER ON" Button
Press this button to set an
automatic equipment switch-on
time in the next 24 hours.
"TIMER OFF" Button
Press this button to set an
automatic equipment switch-off
time in the next 24 hours.
"HR" Button
Press this button to set the
hours.
"MIN" Button
Press this button to set the
minutes.
"RESET button"
(in battery compartment)
Press this button to reset the
remote control to its factory
default configuration.
"CLOCK" Button
(in battery compartment)
Press this button to activate
clock setting mode.
"DISPLAY" Button
Press this button to switch
the display on and off (does
not affect the function of the
equipment )
Buttons on the remote control
1. Automatic mode
In this mode the equipment can
be running in cooling or heating
mode.
2. Cooling mode
In this mode the warm room
air is cooled to the required
temperature.
3. Dehumidfying mode
In this mode the room is
mainly dehumidfied, the set
temperature is maintained.
4. Heating mode
In this mode the warm room
air is heated to the desired
temperature.
"FAN" Button
Press this button to set the
required fan speed. 4 levels
are available: Automatic, high,
medium and low fan speed.
"FINS" Button
Press this button to adjust
the position of the outlet
fins. 5 fixed positions and
an oscillating function are
available.
"SLEEP" Button
Pressing this button will
automatically increase or
decrease the target temperature
by 1 °C every hour in cooling
and heating mode respectively.
"SWING" Button
This button activates the
oscillating fin function
to provide improved air
distribution in the room.
Buttons on the remote control
"ON/OFF" Button
Press this button to start the
equipment.
"TOO HOT" Button
Press this button to reduce the
desired temperature to a value
as low as 16 °C.
"TOO COLD" Button
Press this button to increase the
desired temperature to a value
as high as 31 °C.
"MODE" Button
Press this button to select the
operating mode. The indoor unit
has 4 modes:
7
A flashing dot on the remote control indicates that the remote control is
ready for operation.
Remote control ready for operation
RESET Button
Pressing the RESET button in the battery compartment resets the remote
control. The current time then has to be reprogrammed (see "CLOCK
button“).
RESET 5 sec. Setting the clock
Press the CLOCK button in the battery compartment to set the time.
"CLOCK" will flash on the display. The HR. and MIN. buttons are used
to set the current time. Press the CLOCK button again to complete the
programming procedure,
the display will stop flashing.
CLOCK Button
CLOCKHR/MINCLOCK
Press the ON / OFF button to activate or deactivate the air conditioning
unit. The programmed settings and parameters are shown on the display
before the unit switches off.
ON/OFF Button
ON/OFF ON/OFF
A symbol is shown on the display to indicate that the settings are being transferred.
Button functions
REMKO ML
8
▲/▼ Buttons
The button is used to reduce the target temperature, the button
increases it. In automatic mode the temperature can be increased
or decreased by 1°C. Temperature adjustment is not possible in
dehumidifying mode.
Cooling mode
The display extinguishes
after 1 min.
Automatic mode
MODE Button
Press the MODE button to switch between the operating modes. A total
of 4 modes are available:
1. Automatic cooling or heating mode
2. Cooling Mainly used in summer
3. Dehumidify Used in summer or winter
4. Heating Mainly used in winter
MODEMODEMODE
Automatic Cooling Dehumidify Heating
In automatic mode, the controller automatically selects heating or cooling
mode after it is switched on. The control range is 22 °C to 26 °C. This
can be raised or lowered using the ▲/▼ buttons.
AUTOMATIC Mode
Automatic
MODE
In cooling mode the room air is cooled to the preset target temperature.
The desired room temperature is set in 1 °C steps using the ▲/▼
buttons. If the room temperature reaches 0.5 °C above the set target
temperature, the indoor unit starts to cool the room air. If the actual
temperature falls approx. 1 °C below the set room temperature, the
controller switches the cooling off. In order to protect the compressor, the
controller will only switch the cooling back on after a holding period of 3
minutes.
COOLING Mode
COOLING
MODE
MODE
9
REMKO ML
26
Exploded view ML 261 AT to ML 681 AT
6
1
2
4
5
Spare parts list
When ordering spare parts, please state the computerised part no., unit number and type (see identification plate) !
No. Designation ML 261 AT
ML 351 AT
ML 521 AT
ML 681 AT
1 Front panel 1107800 1107813 1107826 1107838
2 Fan blade, liquefier 1107801 1107814 1107827 1107839
3 Fan motor, liquefier 1107802 1107815 1107828 1107840
4 Ribbed liquefier 1107803 1107816 1107829 1107841
5 Cover panel 1107804 1107817 - -
6 Side panel, right 1107805 1107818 - -
7 Compressor, complete 1107806 1107819 1107830 1107842
8 Condenser, compressor 1107807 1107820 1107831 1107843
9
Condenser, liquefier fan
1107808 1107821 1107832 1107844
10 Stop valve, suction pipe 1107809 1107822 1107833 1107845
11 Stop valve, injection pipe 1107810 1107823 1107834 1107846
12 Compressor contator 1107811 1107824 1107835 1107847
13 Reverse flow valve 1107812 1107825 1107836 1107848
Spare parts (not illustrated)
Rear panel with side section - - 1107837 1107849
3
7
8
9
10
11
13
12
26

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