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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
HEATING Mode
One can also use heating mode to heat the room in spring or autumn.
The room temperature is set in 1 °C steps using the ▲/▼ buttons.If the
room temperature falls 1 °C below the set target temperature, the indoor
unit starts to heat the room air.If the actual temperature exceeds the set
room temperature by approx. 1 °C, the controller switches the heating
off.In order to protect the compressor, the controller will only switch the
heating back on after a holding period of 3 minutes.
MODE
HEATING MODE
In dehumidifying mode, the room temperature is reduced to 24°C. The
low refrigerant temperature causes the air temperature at the finned heat
exchanger to fall below the dew point. Any excess humdity in the air
condenses in the vaporiser. As a result the room is dehumidified. The fan
speed should be set to automatic to achieve maximum dehumidification.
In automatic mode, the fan is intermittently switched on and off.
DEHUMIDIFY Mode
DEHUMIDIFICATION
MODE
MODE
Press this button to set the fan speed. One can choose between low,
medium, high and automatic fan speed.
FAN Button
FANFANFAN FAN
Press this button to individually adjust the air outlet fins.
One can choose between 5 fixed positions and an oscillating function.
FIN Button
Press this button to select the oscillating function for the air outlet
fins. This allows direct switching from a fixed position to the oscillating
function. The swing function improves air circulation in the room.
SWING Button
SWINGSWINGSWING
REMKO ML
10
TIMER Buttons
These buttons are used to program the switch-on and switch-off times.
Pressing the Timer On and Timer Off buttons activates the timer and
extinguishes the clock on the display. The timer symbol for the switch-
on/off time will flash. The Timer symbol on the indoor unit is lit. Press
the HR. and MIN. buttons to set the desired switch-on/off time. If set
successfully, the Timer symbol will flash a further 30 seconds. The unit
automatically switches on or off once the programmed time is reached.
If the indoor unit is switched on automatically, the previously set mode,
temperature and fan speed are activated. The switch-on/off time can be
prematurely cancelled by pressing the appropriate Timer button or ON/
OFF button. The timer symbol on the indoor unit extinguishes.
TIMER Button ON
Timer On HR/MIN 30 sec.
TIMER Button OFF
Timer Off HR/MIN 30 sec.
Press these buttons to activate a program which will raise the target
temperature in cooling mode by 1 °C and 2 °C after 1 and 2 hours
respectively. In heating mode, the target temperature is lowered by 1 °C
and 2 °C after 1 and 2 hours respectively. The unit automatically switches
off after 8 hours.
SLEEP Buttons
TIMER Button ON/OFF
Unit On Unit Off
Example:
The controller switches on at 10:20.
The unit remains operational until 5:00.
The controller switches the unit on and off at the programmed times.
During operation, all the settings and the timer symbol are shown on the
display. If the unit is not running, the display indicates 0->1 and the timer
symbol is shown.
SLEEPSLEEPSLEEP
11
The air outlet side includes
individually adjustable fins
to control the horizontal air
distribution.
Manual air distribution
Interior moving parts, e.g.
fans, are potentially hazardous
during operation!
Only adjust when swing mode
is switched off .
CAUTION
Adjustment lever, left
Manual air distribution
Adjustment lever, right
Shutdown
Temporary shutdown
1. Let the indoor unit run for 2 to
3 hours in circulation mode, or
in cooling mode at maximum
temperature, to extract any
residual humidity from the unit.
2. Shut down the unit using the
remote control.
3. Switch off the voltage supply to
the unit.
4. Preferably cover the unit with
plastic film to protect it against
the weather.
Care and maintenance
Regular care and maintenance
ensure trouble-free operation and
a long service life.
Care
Ensure the indoor unit and
outdoor component are
protected against dirt, mould
and other deposits.
Clean the equipment using a
damp cloth. Do not use any
caustic, abrasive or solvent-
based cleaning products. Do
not use a jet of water.
Clean the fins on the indoor
unit and outdoor component
prior to long shutdown periods.
Prior to performing any
work, ensure the equipment
is isolated from the voltage
supply and secured to prevent
accidental switch-on!
CAUTION
Permanent shutdown
Ensure that equipment 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 their
authorised partners will be pleased
to provide details of specialists in
your area.
REMKO ML
12
Maintenance
It is recommended that you
take out a maintenance
contract with an annual service
from an appropriate specialist
firm.
Cleaning the condensation
pump (accessory)
The indoor unit may include a
built-in or separate condensation
pump for pumping the
condensation to a drain at a higher
level.
Observe the care and maintenance
instructions specified in the
separate manual.
Type of task
Checks/Maintenance/Inspection
Commissioning
Monthly
Six-monthly
Yearly
General
Measure voltage and current
Check compressor/fans are functioning correctly
Check fan is functioning correctly
Dirt on liquefier/vaporiser
Check refrigerant fill quantity
Check condensation drain
Test insulation
Check moving parts
Cleaning the housing of the
indoor unit
1. Disconnect the supply voltage
to the equipment.
2. Open and lift the front air inlet
guard.
3. Clean the guard using a soft,
damp cloth.
4. Switch the supply voltage back
on.
Air filter for indoor unit
Clean the air filter at least every
2 weeks. Reduce this interval if the
air is especially dirty.
Cleaning the filter in the
indoor unit
1. Disconnect the supply voltage
to the equipment.
2. Open the front of the unit by
lifting the guard and latching it
in position (Fig. 1).
3. Lift the filter and pull it down
and out.
4. Clean the filter using a normal
vacuum cleaner. The dirty side
should be face up (Fig. 2).
2 Clean with a vacuum cleaner
3
Cleaning with lukewarm water
This ensures the operational
reliability of your equipment!
TIP
5. Any dirt can be cleaned off
using lukewarm water and mild
cleaning agents. The dirty side
should be face down (Fig. 3).
6. If water is used, let the filter
dry out properly in air before
replacing it in the unit.
7. Carefully insert the filter. Ensure
it locates correctly.
8. Close the front of the unit
in the reverse order to that
described above.
9. Switch the supply voltage back
on.
10.
Switch the unit back on.
1 Lift the guard
13
Troubleshooting and customer service
The equipment and components are manufactured using state-of-the-art production methods and tested several
times to verify their correct function. If malfunctions should occur, please check the functions as detailed in the
list below. Please inform your dealer if the unit is still not working correctly after all the functional checks have
been performed!
Fault possible cause Checks Remedial measures
The unit does not start or
switches itself off
Power outage, undervoltage,
defective mains fuse / main circuit
breaker switched off
Are all electrical installations
functioning correctly?
Check the voltage and if necessary
wait for it to come back on
Damaged mains cable
Are all electrical installations
functioning correctly?
Repair by specialist
Waiting time after switch-on too
short
Have approx. 5 minutes
elapsed since the restart?
Schedule longer waiting times
Temperate outside operating
temperature range
Are the fans in the indoor unit
and outside component working
correctly?
Take into account the temperature
range for the indoor unit and
outside component
Overvoltages caused by thunder
storms
Has there recently been lightning?
Switch off the mains protection
and switch it back on /
have it checked by a specialist
Fault in external condensation
pump
Did the pump shut down due to
a fault?
Check and if necessary clean the
pump
The unit does not respond to
the remote control.
Transmission distance too far /
receiver affected by interference
Does the indoor unit beep when
pressing a button?
Reduce the distance to less than 6
m or change position
Defective remote control
Is the unit running in manual
mode?
Replace the remote control
Receiver&transmitter unit exposed
to excessive solar radiation
Does it function correctly in the
shade?
Place the receiver&transmitter unit
in the shade
Electromagnetic fields are
interfering with transmission
Does it function when
switching off possible sources of
interference?
Signal is not transmitted
when interference sources are
operational
Button in remote control jammed /
two buttons pressed at same time
Does the “Send” symbol appear
on the display?
Release the button / only press
one button
Batteries in remote control are flat
Have new batteries been inserted?
Is the display incomplete?
Insert new batteries
The unit is running but only
provides reduced cooling or
heating performance
Filter is unclean / air inlet / outlet
blocked by foreign items
Have the filters been cleaned? Clean the filters
Doors and windows open.
Heating/cooling output increases
Have modifications been made to
the building?
Close windows and doors / install
additional units
Neither cooling nor heating mode
has been set
Is the cooling/heating symbol
shown on the display?
Correct the settings for the unit
Fins on outdoor component
blocked by foreign items
Is the fan on the outdoor
component running ? Are the fins
unobstructed?
Check the fan or winter controller,
reduce the air resistance
Leaking refrigerant circuit
Are there signs of frost on the fins
of the indoor unit?
Repair by specialist
Condensation is leaking out of
the unit
Drainage pipe on collection
container clogged / damaged
Can the condensation drain off
without any obstruction?
Clean the drainage pipe and
collection container
Faulty external condensation
pump or float
Is the condensation tray full and
the pump running?
Call out a specialist to replace the
pump
Condensation has not drained
away and has collected in the
condensation pipe
Is there a steady fall on the
condensation pipe? Check there is
no blockage in the pipe.
The condensation pipe must have a
fall. If necessary, clean the pipe
Condensation does not drain off
Are the condensation pipes
unblocked and is there a steady fall?
Are the condensation pump and
float switch functioning correctly?
The condensation pipe must have a
fall. If necessary, clean the pipe.
A faulty condensation pump and
float switch should be replaced.
Malfunction
REMKO ML
14
Error indicated by flashing code
Installation instructions for qualified personnel
Important points prior to
installation
Transport the unit in its original
packaging as close as possible
to the installation location.
This avoids transportation
damage.
Check that the packaged
contents are complete and
inspect the unit for any visible
signs of transportation damage.
Notify any deficiencies to
the contractual partner and
forwarding agent.
Lift the unit by its corners
and not the refrigerant or
condensation connections.
Insulate the refrigerant pipes
(injection and suction pipe),
valves and connections to make
them tight against vapour
diffusion. If necessary, also
insulate the condensation pipe.
Select an installation location
which allows air to freely
flow through the inlet and
outlet. (see section "Minimum
clearances").
Do not install the unit
adjacent to any hotspots. Unit
performance will be impaired if
installed next to hotspots.
Only open the stop valves
for the refrigerant pipes after
installation has been fully
completed.
Use caps or adhesive tape to
seal off the
open refrigerant pipes and
prevent the ingress of humidity.
Never kink or push in the
refrigerant pipes.
Avoid unnecessary bending.
This minimises the pressure
loss in the refrigerant pipes and
ensures that the compressor
oil can flow back without
obstruction.
Special measures concerning
the oil return pipe must
be taken if the outdoor
components is mounted above
the indoor unit.
See section "Oil return
measures".
Add refrigerant if the basic
length of the refrigerant pipe
exceeds 5 metres. The amount
of additional refrigerant is
given in the chapter "Adding
refrigerant".
Only use the union nuts
supplied with the refrigerant
pipes. These should only
be removed shortly before
connecting the refrigerant
pipes.
Establish all electrical
connections is accordance with
the relevant DIN- and VDE
standards.
Ensure the electrical cables
are properly connected to the
terminals, otherwise there is a
risk of fire.
Display Cause Required action
E1 Faulty circulation sensor in indoor unit Contact specialist dealer
E2 Faulty frost protection sensor in indoor unit Contact specialist dealer
E4
Cooling mode: No cooling output after 30 min.
Heating mode> No heating output after 30 min.
Contact specialist dealer
E5
Cooling mode: Frost protection has tripped
Heating mode> Overheating protection has tripped
Contact specialist dealer
E6 Break in internal control cable jumper Check jumper connector
15
Selecting the installation
location
Indoor unit
The indoor unit is designed for
horizontal wall-mounting above
doors. It can also be fitted high up
on walls (min. 1.75 m above the
level of the floor).
Outdoor component
The outdoor component is
designed for horizontal free-
standing use in outdoor areas. It
should be placed on level, flat and
firm ground. The unit should also
be secured to prevent toppling.
The outdoor unit can be installed
both inside and outside buildings.
In the case of outdoor installation,
please follow the instructions given
below to protect the unit against
the weather.
Wall breakthroughs
The wall breakthrough must
have a diameter of min. 70 mm
and a fall of 10 mm from inside
to outside.
We recommend that the
inside of the hole is padded or
lined, e.g. using a PVC tube,
to prevent the pipes being
damaged.
After installation has been
completed, use a suitable
sealing compound to close
off the wall breakthrough
(responsibility of customer). Do
not use cement- or lime/based
materials!
Installation material
The indoor unit is fastened using
4 screws and a wall bracket. The
screws should be provided by the
customer.
The outdoor component is
fastened to the wall or ground
using 4 screws and a wall or floor
bracket.
Minimum clearance to snow
20 cm
Snow
Windbreak
Wind
Pipes and cables in wall breakthrough
Control cable
Condensation pipe
Injection pipe
Suction pipe
PVC tube
Rain
The unit should be at least 10 cm
off the ground when mounted on
the roof or ground. An optional
floor bracket is available as an
accessory.
Sun
The liquefier on the outdoor
component radiates heat. Exposure
to direct sunlight will further
increase the temperature of the
fins and reduce the heat output
of the finned heat exchanger.
The outdoor component should
therefore be installed as near
as possible to the north side of
the building. If necessary, take
measures to provide sufficient
shade (responsibility of customer).
One possible solution is to build a
small roof. These measures should
not affect the flow of warm outlet
air.
Wind
If the unit is being installed in
windy areas, ensure that the
warm outlet air discharges in the
main wind direction. If this is not
the case it may be necessary to
install a windbreak (provided by
the customer). Ensure that the
windbreak does not adversely
affect the air intake to the unit.
Snow
The unit should be wall-mounted
in areas of heavy snowfall.
Installation should be at least
20 cm above the expected level
of snow to prevent snow from
entering the outdoor component.
An optional wall bracket is
available as an accessory.
REMKO ML
16
200
120
1500
120
120
Installation inside buildings
Ensure there is adequate heat
dissipation when placing the
outdoor component in cellars,
attics, adjoining rooms or halls
(Fig 4).
Install an additional fan with
a rated flow comparative to
that of the outdoor component
being installed in the room.
This is used in conjunction with
ventilation ducts to compensate
any pressure losses (Fig 4).
Ensure a continuous and
unobstructed air flow from
outside, preferably using
sufficiently large air intakes placed
opposite each other (Fig 4).
Minimum clearances
Observe the minimum clearances
to allow access for maintenance
and repair work and facilitate
optimum air distribution.
ML 261 AT ML 351 AT ML 521 AT ML 681 AT
A 150 mm
B 700 mm 900 mm
C 400 mm
D 150 mm
E 200 mm 400 mm 600 mm
Comply with any regulations
and conditions affecting
the statics of the building.
If necessary, fit acoustic
installation.
Minimum clearances
E
C
B
A
D
Air intake
Air outlet
Warm air
Fresh
cold air
Light
well
Outdoor component
Warm air
Light
well
Additional
fan
4 Installation inside buildings
Air intake
Air outlet
All values in mm
17
Connection options
1 Exit on wall, right
2 Exit through wall, right
3 Exit through wall, left
4 Exit on wall, left
1
2
3
4
Connection options for
indoor unit
The units are factory filled with
dry nitrogen to
check for leaks.
The pressurised nitrogen is
released when
loosening the union nuts.
CAUTION
Installing the unit
The indoor unit is fastened by
means of wall bracket. Take into
account the air outlet underneath
the unit.
1. Use the wall bracket dimensions
to mark the fixing points on
structural parts approved to
support the static load.
2. If necessary, remove the break-
outs on the housing.
3. Connect the refrigerant
pipes, electrical cables and
condensation pipe to the indoor
unit as described below.
4. Tilt back the indoor unit and
hang it into the wall bracket.
Press the underside of the unit
into the bracket (Fig 5).
5. Check that the unit is level.
Wall bracket
for indoor unit
Attach the wall bracket for the
unit using suitable screws and wall
plugs.
Installation
Installation should only be
performed by authorised
specialists.
NOTE
Oil return measures
If the outdoor component 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.
5
Hooking in
Connecting the refrigerant
pipes
The connections to the refrigerant
pipes are made at the rear of the
unit (responsibility of customer).
It may be necessary to fit a reducer
or flared adapter to the indoor
unit. These fittings are included
as standard. Once installed, the
connections should be made tight
against vapour diffusion.
The procedures for installing the
refrigerant circuit and mounting
the indoor unit and outdoor
component are described below.
1.
The required pipe diameters are
given in the table "Technical
data".
2. Remove the factory-fitted
protective caps and union
nuts on the connections.
These should be used during
installation.
3. Before flanging the refrigerant
pipes, ensure that the union nut
is fitted on the pipe.
4. Prepare the laid refrigerant
pipes as shown below
(page 19, figs 6+7).
REMKO ML
18
Oil return measures
Outdoor
component
Oil pump bend
in suction pipe
to outdoor
component one
every 2.5 metres of
rising pipe
Radius:
min. 50 mm
max. 15 m
Indoor unit
Supplementary
installation notes
If the basic length of the
refrigerant pipe exceeds
5 m, add refrigerant when
commissioning the system
for the first time. (See section
"Adding refrigerant").
Only employ tools and
components suitable for
refrigeration applications.
NOTE
Flanging tool
7 Flanging the refrigerant pipe
Refrigerant pipe
Deburrer
6 Deburring the refrigerant pipe
8 Correct flange shape
Tighten with 1st open-
ended spanner
Counter
using 2nd open-
ended spanner
9 Tightening the fitting
Tightening
torque:
1
4
15-20 Nm
3
8
33-40 Nm
1
2
50-60 Nm
5
8
65-75 Nm
3
4
95-105 Nm
5. Verify that the shape of the
flange is correct(Fig 8).
6. First connect and hand-tighten
the refrigerant connections
to ensure they are correctly
seated.
7. Now fully tighten the fittings
using 2 suitably sized open-
ended spanners. Use one
spanner to counter the force
when tightening the fitting
(Fig 9).
8. Use insulation hoses which are
designed for this temperature
range and diffusion tight.
9. Lay the refrigerant pipes from
the indoor unit to the outdoor
component. Ensure that the
fastenings are adequate and if
necessary, take appropriate oil
return measures!
10.
Observe the permitted bending
radius for the refrigerant pipes
during installation. Never bend
a pipe twice in the same place.
Brittle pipes and potential
cracking are the consequences.
12.
Ensure that structure-borne
sound is not transferred to parts
of the building . Use vibration
dampers to reduce the effects
of structure-borne sound!
13.
Prepare the refrigerant pipe
for the outdoor component as
described above.
11.
Use the wall or floor brackets
to fit the outdoor component
against structural parts
approved to support the static
load (refer to the installation
instructions for the brackets).
19
10
Fall on condensation pipe
at least
2% fall
The standard condensation hose is
for connection to the left side (as
viewed from the front).
All electrical installation
work should be performed by
specialist contractors. Isolate the
voltage supply when connecting
the electrical terminals.
CAUTION
Tightness check
Once all the connections have
been established, the pressure
gauge station is attached as
follows to the Schrader valve (if
fitted):
red = small valve
= injection pressure
blue = large valve
= suction pressure
Once connected, perform a
tightness test using dried nitrogen.
The tightness test involves
spraying a leak detection spray
onto the connections. If bubbles
are visible, the connections have
not been properly made. Re-
tighten the connection or prepare
a new flange.
If the tightness test is successfully
completed, depressurise the
refrigerant pipes and start a
vacuum pump with an absolute
final partial pressure of min. 10
mbar to remove the air in the pipe.
Any humdity present in the pipes is
also removed.
A vacuum of min. 20 mbar
abs. must be created!
CAUTION
The time required to generate
the vacuum is dependent on
the pipework volume of the
indoor unit and the length of the
refrigerant pipes. This always takes
at least 60 minutes.
Once any foreign gases and
humdity have been completely
extracted from the system, the
valves on the pressure gauge
station are closed and the valves
on the outdoor component are
opened as described in the chapter
on "Commissioning".
Condensation connection
If the temperature falls below the
dew point, condensation will form
on either the vaporiser in cooling
mode or the liquefier in heating
mode.
The collection tray below the
vaporiser should be connected to
the drain.
The lower panelling on the
outdoor component acts as a
collection tray. Use the supplied
condensation connection for this
purpose.
The condensation pipe should
have a fall of min. 2 % (Fig
10). This is the responsibility
of the customer. If necessary,
fit vapour diffusion tight
insulation.
The condensation pipe from
the unit should run freely
into the drainage pipe. If the
condensation runs directly
into a sewer pipe, fit a trap to
prevent any unpleasant odours.
When operating the unit at
outdoor temperatures below
0 °C, ensure the condensation
pipe is laid to protect it against
frost. The lower panelling
on the housing should also
be protected against frost to
ensure condensation can drain
off at all times (responsibility of
customer).
If necessary, fit supplementary
pipe heating.
Once the pipe has been laid,
check the condensation drains
off and permanently seal it.
Electrical connection
A protected mains supply and
control cable should be connected
to the outdoor component and
indoor unit respectively.
We recommend that customers
install a main/repair switch
in the vicinity of the outdoor
component.
If an optional condensation
pump is used 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.
Control cables should be
screened if laid in areas exposed
to strong magnetic fields..
Details concerning the electrical
protection of the system are
given in the section on technical
data.
REMKO ML
20
Connecting the outdoor
component
Proceed as follows to connect the
cable:
1. Remove the cover from the
unit.
2. Remove the side panel next to
the terminals.
3. Select the cable cross-section
according to the relevant
standards.
4. Feed both cables through the
edge protection rings on the
fixed connection panel.
Electrical connection diagram
Connections ML 261 to ML 521
Check all plugged and clamped
terminals to verify they are
seated correctly and making a
permanent contact. Re-tighten
as required.
CAUTION
5. Terminate the cables as shown
on the electrical connection
diagram.
6. Support the cable in the strain
relief and re-assemble the unit.
(Fig 12).
12
Connecting the outdoor unit
Outdoor
component
Indoor unit Mains cable
Earth conductor
Neutral conductor
Phase conductor
Reverse flow valve
rear
terminal
block
front
terminal
block
230 V~,
50 Hz,
L1 / N
/ PE
Control
conductor
Compressor contator
PE
NN
PE
3
2
3
PE
N
L L L
2
11
Control
conductor
Control
conductor
Fan motor
Neutral conductor
Phase
conductor
Connection ML 681
Outdoor
component
Indoor unit Mains cable
Neutral conductor
Phase conductor
Reverse flow valve
230 V~,
50 Hz,
L1 / N
/ PE
Control
conductor
Compressor contator
N
L1
PE
L
N
3
2
3
N
L
2
1
PE
1
PE
Control
conductor
Control
conductor
Earth conductor
Fan motor
front
terminal
block
Connecting the indoor unit
Make the connection as follows:
1. Open the air intake guard.
2. Unfasten the cover on the right
side and at the bottom right
rear (Fig 11).
3. Connect the unit to the
control cable from the outdoor
component (to be provided
by customer). See electrical
connection diagramOn the
ML 681 IT series, the terminal
block for the mains supply
and control contacts is located
behind the front cover.
4. Re-assemble the unit.
11
Connecting the indoor unit
front terminal block
control cable
from outdoor unit
Cover rear terminal block
supply voltage
from outdoor unit
Cover
21
Electrical circuit diagram
ML 261 IT to ML 681 IT
ML 261 AT to ML 681 AT
R
S
L
N
3
2
1
C
BK
BU
BU
BK
WH
BN
BU
Liquefier fan
Compressor
Compressor contator
Colour code
WH = white
BU = blue
BR = brown
BK = black
Control
cable
Mains
cable
Reverse flow valve
3
1
2
L
N
AC-N
FM
SM
AC-L
COMP
Display
Receiver
board
Vaporiser sensor
Air circulation sensor
Vaporiser fan motor
Swing motor
Transfor
mer
Fan motor
Reverse flow valve
Compressor
Liquefier fan
Reverse flow valve
Compressor
REMKO ML
22
Add refrigerant
The equipment contains a basic
quantity of refrigerant. Extra
refrigerant must be added if the
basic length of the refrigerant
pipes exceeds 5 metres. Refer to
the following table:
ML
261
ML
351
ML
521
ML
681
Basic pipe
length
Additional fill quantity
Up to and
incl.
5 m
0 g/m
5 m to max.
25 m
25
g/m
25
g/m
25
g/m
45
g/m
After the tightness check has
been successfully completed,
connect the vacuum pump via
the pressure gauge station to
the valve connections on the
outdoor component (see chapter
"Tightness check") and create a
vacuum.
Perform the following checks
prior to commissioning the
unit for the first time and after
any interventions affecting the
refrigerant circuit. Record the
results in the commissioning
report:
Check all refrigerant pipes and
valves using leak detection
spray or soapy water to ensure
they are tight and that the
suction and injection pipes
are not accidentally mixed up.
Perform this check when the
unit is not running .
Check the refrigerant pipes and
insulation for signs of damage.
Check the electrical connections
between the indoor unit and
outdoor component to verify
the correct polarity.
Check that all fastenings,
mountings etc. are firm and at
the correct level.
Before
commissioning
Note that the employed
refrigerant is always filled in
liquid form!
CAUTION
NOTE
Check the overheating to
determine the refrigerant fill
quantity
Wear protective clothing when
handling refrigerant.
CAUTION
Commissioning
Commissioning should only be
performed and documented
by specially trained personnel.
NOTE
The system can be commissioned
once all the components have
been connected and tested.
A functional check should be
performed to verify its correct
function and identify any unusual
operational behaviour prior to
handing it over to the operator.
Functional checks and
test run
Check the following points:
Tightness of the refrigerant
pipes.
Compressor and fan running
smoothly.
In cooling mode, cold air should
be output by the indoor unit,
and warm air should be output
by the outdoor component.
Functional test of the indoor
unit and all program sequences.
Check the surface temperature
of the suction pipe and
determine the overheating
of the vaporiser. Measure
the temperature by holding
a thermometer against the
suction pipe and subtracting
the boiling point temperature
indicated on the pressure
gauge.
Record the measured
temperatures in the
commissioning report.
Check that the stop valves
and valve caps are tight after
carrying out any work on the
refrigerant circuit. If necessary,
use appropriate sealant
products.
NOTE
Functional test for cooling
and heating modes
1. Remove the protective caps on
the valves.
2. Start the commissioning
procedure by briefly opening
the stop valves on the outdoor
component until the pressure
gauge indicates a pressure of
approx. 2 bar.
3. Use leak detection spray or
suitable devices to check that all
the connections are tight.
23
Final tasks
Re-fit all the dismantled parts.
Instruct the operator on how to
use the equipment.
4. If no leaks are found, fully
open the stop valves by turning
them anti-clockwise using a
spanner. If leaks are found,
repair the faulty connection. It
is imperative that the vacuum
creation and drying steps are
repeated!
5. Switch off the main circuit
breaker or remove the fuse
(provided by the customer).
6. Use the remote control to
switch on the unit and select
the cooling mode, maximum
fan speed and lowest target
temperature.
7. Measure and record all
the required values in the
commissioning report and
check the safety functions.
8. Check the control system in the
unit by referring to the
Functions. Timer, temperature
setting, fan speeds and
switching to ventilation or
dehumidifying mode.
9. Check the correct function
of the condensation pipe by
pouring distilled water into the
condensation tray.
A bottle with a spout is
recommended for pouring the
water into the condensation
tray.
10.
Switch the indoor unit to
cooling mode.
11.
Check the correct function
and settings of all regulation,
control and safety devices
during the test run.
12.
Check the control system in the
indoor unit using the functions
described in the manual.
Timer, temperature settings and
all mode settings in the chapter
"Operation".
Unit dimensions
We reserve the right to modify the dimensions and constructional design as part of the ongoing technical development process.
All values in mm
ML 260 AT to ML 520 AT
780
510
280
250
540
ML 680 AT / ML 680 IT
285
615
500
315
845
790
275
200
930
275
200
1035
320
220
13.
Check the overheating,
outdoor, indoor, outlet and
vaporisation temperatures and
record the measured values in
the commissioning report.
14.
Switch the indoor unit to
heating mode.
15.
Check all the previously
described safety devices and
functions during the test run.
16.
Record the measured values in
the commissioning report.
17.
Remove the pressure gauge.
Check that seals have been
fitted in the sealing caps.
ML 260 IT / ML 350 IT
ML 520 IT
ML 680 IT
REMKO ML
24
Exploded view of ML 261 IT to ML 681 IT
We reserve the right to modify the dimensions and constructional
design as part of the ongoing technical development process.
When ordering spare parts, please state the computerised part no., unit number and type (see identification plate)!
Spare parts list
No. Designation ML 261 IT ML 351 IT ML 521 IT ML 681 IT
1 Front panel, complete 1109400 1109413 1109426 1109439
2 Air filter, set 1109401 1109414 1109427 1109440
3 Circuit board, display 1109402 1109415 1109428 1109441
4 Swing motor 1109403 1109416 1109429 1109442
5 Outlet fins, set 1109404 1109417 1109430 1109443
6 Condensation tray 1109405 1109418 1109431 1109444
7 Vaporiser 1109406 1109419 1109432 1109445
8 Fan wheel 1109407 1109420 1109433 1109446
9 Fan motor 1109408 1109421 1109434 1109447
10 Control board 1109409 1109422 1109435 1109448
11 Transformer 1109410 1109423 1109436 1109449
12 IR remote control 1109411 1109424 1109437 1109450
Spare parts (not illustrated)
Circulation sensor / vaporiser sensor 1109412 1109425 1109438 1109451
3
1
2
7
4
8
9
11
12
6
10
5
25
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
27
Technical data
Series ML 261 ML 351 ML 521 ML 681
Operating mode Wall-mounted air-conditioning units for combined cooling/heating
Nominal cooling output
1)
kW 2.69 3.59 5.27 6.84
Nominal heating output
2)
kW 2.96 4.24 6.31 7.72
Energy efficiency class, cooling
1)
A A B B
Energy efficiency ratio EER
1)
3.32 3.23 3.12 3.05
Energy efficiency class, heating
2)
A A C C
Coefficient of performance COP
2)
3.70 3.66 3.29 3.24
Operating range (room volume), approx. 80 110 160 230
Refrigerant R 410A
Voltage supply V/Hz 230 / 1~ / 50
Nom. electrical power consumption, cooling
1)
kW 0.81 1.11 1.69 2.24
Nom. electrical power consumption, heating
2)
kW 0.80 1.16 1.92 2.38
Nom. current consumption, cooling
1)
A 3.60 4.99 7.76 10.43
Nom. current consumption, heating
2)
A 3.61 5.32 8.87 10.75
Electr. starting current, max. A 21 28 35 51
Refrigerant connection, injection pipe Inches(mm) 1/4 (6.35) 1/4 (6.35) 1/4 (6.35) 3/8 (9.52)
Refrigerant connection, suction pipe Inches(mm) 3/8 (9.52) 1/2 (12.70) 1/2 (12.70) 5/8 (15.90)
Max. operating pressure kPa 4200 / 4200
Data specific to indoor unit
ML 261 IT ML 351 IT ML 521 IT ML 681 IT
Adjustment range, room temperature °C +16 to +31
Working range °C +15 to +31
Air flow rate per stage m³/h 320/370/420 380/450/520 600/700/800 800/900/1000
Noise output per stage
3)
dB(A) 30/34/38 32/36/40 35/39/43 37/41/45
Protection degree IP X0
Condensation connection mm 17 17 17 17
Dimensions Height
mm 275 275 275 320
Width mm 790 790 930 1035
Depth mm 200 200 200 220
Weight kg 8.0 10.0 12.0 16.0
Data specific to outdoor unit
ML 261 AT ML 351 AT ML 521 AT ML 681 AT
Working range, cooling °C +7 to +48
Working range, heating °C -7 to +25
Air flow rate, max. m³/h 1925 2050 2050 2310
Protection degree IP 24
Noise level, max.
3)
dB(A) 52 53 55 56
Refrigerant, basic quantity kg 0.70 1.00 1.45 1.80
Refrigerant, additional quantity> 5 m g/m 25 25 25 45
Refrigerant pipe, max. length m 25 25 25 25
Kältemittelleitung, Höhe max. m 15 15 15 15
Dimensions Height mm 540 540 540 615
Width mm 780 780 780 845
Depth mm 250 250 250 285
Weight kg 30.0 34.0 40.0 48.0
Serial number 803... 804... 805... 806...
Computerised part no. 1630260 1630350 1630520 1630680
1) Air inlet temperature TK 27°C / FK 19°C, outdoor temperature TK 35 °C, FK 24 °C, max. air flow rate
2) Air inlet temperature TK 20°C, outdoor temperature TK 7°C / FK 6°C, max. air flow rate
3) Distance 1 m free air
Subject to technical modifications, no responsibility taken for the correctness of information!
Consultancy
Intensive training means
our consultants are always
up-to-date with the latest
developemnts. This has given
us the reputation of being more
than just a good and reliable
supplier:
REMKO, a partner who helps
solve problems.
.
Sales
REMKO not only has a well-
established sales network
at home and abroad, it also
employs highly trained sales
specialists.
REMKOOur field staff are more
than just salesmen: above all,
they must advise our clients in
the areas of air conditioning and
heating technology.
Customer service
Our equipment is precise and
reliable. However, should a fault
should occur REMKO customer
service is quickly at your side.
Our comprehensive network of
experienced dealers guarantees
quick and reliable service.
REMKO GmbH & Co. KG
Klima- und Wärmetechnik
Im Seelenkamp 12 · 32791 Lage
Postfach 1827 · 32777 Lage
Telephone +49 5232 606-0
Telefax +49 5232 606-260
E-mail info@remko.de
Internet www.remko.de
Hotline
Advice, sales air conditioning technology
+49 5232 606-160
Advice, sales heating technology
+49 5232 606-100
Spare parts sales
+49 5232 606-210
Export
+49 5232 606-130
Service
+49 5232 606-200
REMKO INTERNATIONAL
and in your area!
Prot from our experience and advice
9

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