REMKO MXT 263 User manual

Assembly and operating instructions
Read the instructions prior to performing any task!
REMKO MXT
MXT 263, MXT 353, MXT 523
Inverter compact wall chest in multisplit design
0136-2016-06 Edition 1, en_GB

Installation and operating instructions (translation of the orig-
inal)
Read these operating instructions carefully before commis-
sioning / 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 mis-
prints!

Table of contents
1 Safety and usage instructions............................................................................................................. 4
1.1 General safety notes....................................................................................................................... 4
1.2 Identification of notes...................................................................................................................... 4
1.3 Personnel qualifications.................................................................................................................. 4
1.4 Dangers of failure to observe the safety notes................................................................................ 4
1.5 Safety-conscious working............................................................................................................... 4
1.6 Safety notes for the operator........................................................................................................... 5
1.7 Safety notes for installation, maintenance and inspection.............................................................. 5
1.8 Unauthorised modification and changes......................................................................................... 5
1.9 Intended use................................................................................................................................... 5
1.10 Warranty........................................................................................................................................ 5
1.11 Transport and packaging.............................................................................................................. 6
1.12 Environmental protection and recycling........................................................................................ 6
2 Technical data....................................................................................................................................... 7
2.1 Unit data.......................................................................................................................................... 7
2.2 Unit dimensions............................................................................................................................... 8
3 Design and function.............................................................................................................................. 9
3.1 Unit description............................................................................................................................... 9
4 Operation............................................................................................................................................. 10
4.1 General notes................................................................................................................................ 10
4.2 Display on indoor unit.................................................................................................................... 11
4.3 Manual air distribution................................................................................................................... 12
4.4 Keys on the remote control........................................................................................................... 14
5 Installation instructions for qualified personnel.............................................................................. 20
6Installation........................................................................................................................................... 21
7 Condensate drainage connection and safe drainage...................................................................... 22
8 Electrical wiring................................................................................................................................... 23
8.1 General notes................................................................................................................................ 23
8.2 Electrical wiring diagram............................................................................................................... 24
8.3 Unit type selection and temperature compensation...................................................................... 26
8.4 Electrical drawings........................................................................................................................ 27
9 Commissioning................................................................................................................................... 29
10 Troubleshooting and customer service............................................................................................ 30
11 Care and maintenance........................................................................................................................ 33
12 Exploded view of the unit and spare parts list................................................................................. 35
12.1 Exploded view of the unit ........................................................................................................... 35
12.2 Spare parts list............................................................................................................................ 36
13 Shutdown............................................................................................................................................. 37
14 Index..................................................................................................................................................... 38
3

1 Safety and
usage instructions
1.1 General safety notes
Carefully read the operating manual before com-
missioning 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 Identification of notes
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 sym-
bols. Safety notes are introduced with signal words
which help to highlight the magnitude of the danger
in question.
DANGER!
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.
CAUTION!
This combination of symbol and signal word
warns of a potentially hazardous situation,
which if not avoided may cause injury or mate-
rial 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 recom-
mendations as well as information for efficient
and fault-free operation.
1.3 Personnel qualifications
Personnel responsible for commissioning, opera-
tion, maintenance, inspection and installation must
be able to demonstrate that they hold a qualifica-
tion which proves their ability to undertake the
work.
1.4 Dangers of failure to observe
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:
nThe failure of important unit functions.
nThe failure of prescribed methods of mainte-
nance and repair.
nDanger 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.
REMKO MXT
4

1.6 Safety notes for the operator
The operational safety of the units and compo-
nents is only assured providing they are used as
intended and in a fully assembled state.
nThe units and components may only be set up,
installed and maintained by qualified per-
sonnel.
nProtective covers (grille) over moving parts
must not be removed from units that are in
operation.
nDo not operate units or components with
obvious defects or signs of damage.
nContact with certain unit parts or components
may lead to burns or injury.
nThe units and components must not be
exposed to any mechanical load, extreme
levels of humidity or extreme temperature.
nSpaces in which refrigerant can leak sufficient
to load and vent. Otherwise there is danger of
suffocation.
nAll housing parts and device openings, e.g. air
inlets and outlets, must be free from foreign
objects, fluids or gases.
nThe units must be inspected by a service tech-
nician at least once annually. Visual inspec-
tions and cleaning may be performed by the
operator when the units are disconnected from
the mains.
1.7 Safety notes for installation,
maintenance and inspection
nAppropriate hazard prevention measures must
be taken to prevent risks to people when per-
forming installation, repair, maintenance or
cleaning work on the units.
nThe 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.
nLocal regulations and laws such as Water
Ecology Act must be observed.
nThe power supply should be adapted to the
requirements of the units.
nUnits 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.
nMobile units must be set up securely on suit-
able surfaces and in an upright position. Sta-
tionary units must be permanently installed for
operation.
nThe units and components should not be oper-
ated in areas where there is a heightened risk
of damage. Observe the minimum clearances.
nThe units and components must be kept at an
adequate distance from flammable, explosive,
combustible, abrasive and dirty areas or
atmospheres.
nSafety devices must not be altered or
bypassed.
1.8 Unauthorised modification
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 addi-
tional 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 lia-
bility 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 Warranty
For warranty claims to be considered, it is essential
that the ordering party or its representative com-
plete 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 "Gen-
eral business and delivery conditions". Further-
more, only the parties to a contract can conclude
special agreements beyond these conditions. In
this case, contact your contractual partner in the
first instance.
5

1.11 Transport and packaging
The devices are supplied in a sturdy shipping con-
tainer. 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.
WARNING!
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 Environmental protection
and recycling
Disposal of packaging
All products are packed for transport in environ-
mentally friendly materials. Make a valuable contri-
bution to reducing waste and sustaining raw mate-
rials. Only dispose of packaging at approved
collection points.
Disposal of equipment and components
Only recyclable materials are used in the manufac-
ture of the devices and components. Help protect
the environment by ensuring that the devices or
components (for example batteries) are not dis-
posed in household waste, but only in accordance
with local regulations and in an environmentally
safe manner, e.g. using certified firms and recy-
cling specialists or at collection points.
REMKO MXT
6

2 Technical data
2.1 Unit data
Series MXT 263 MXT 353 MXT 523
Operating mode Wall chest for inverter multisplit outdoor units for
cooling and heating
Nominal cooling output 1) kW 2.6 3.5 5.3
Nominal heat capacity 2) kW 2.9 3.5 5.3
Application area (room volume), approx. m380 110 160
Adjustment range room temperature °C +17 to +30
Operating range °C/r.H.
%+17 to +32 / 35-65
Refrigerant 4) R 410A
Max. operating pressure kPa 4200
Air flow volume per level m³/h 450/580/680 360/470/550 520/650/740
Sound pressure level per speed setting 3) dB (A) 35/40/45 35/41/47 39/44/48
Sound power level max. dB (A) 56 58 59
Power supply V / Ph /
Hz 230 / 1~ / 50
Enclosure class IP X 0
Electrical rated power consumption, cooling 1) W30 40 50
Electrical rated power consumpt., heating 2) W36 48 58
Electrical rated current consumpt., cooling 1) A0.13 0.17 0.22
Electrical rated current consumpt., heating 2) A0.16 0.21 0.25
Refrigerant connection
Injection pipe
Inches
(mm) 1/4 (6.35) 1/4 (6.35) 1/4 (6.35)
Refrigerant connection
Suction pipe
Inches
(mm) 3/8 (9.52) 3/8 (9.52) 1/2 (12.70)
Condensate drainage connection mm 22
7

Series MXT 263 MXT 353 MXT 523
Dimensions
Height mm 600
Width mm 700
Depth mm 210
Weight kg 13.5 15.0 15.0
EDP no. 1623282 1623287 1623292
1) Air inlet temp. TK 27 °C / FK 19 °C, outside temperature TK 35 °C, FK 24 °C, max. air flow volume,
5 m pipe length
2) Air inlet temp. TK 20 °C, outside temperature TK 7 °C, FK 6 °C, max. air flow volume,
5 m pipe length
3) Distance 1m free field
4) Contains greenhouse gas according to Kyoto protocol, GWP=2088
2.2 Unit dimensions
600
700 210
195
1
Fig. 1: Unit dimensions MXT 263-523 (All measurements in mm)
1: Mounting plate
We reserve the right to modify the dimensions and design as part of the ongoing technical development
process.
REMKO MXT
8

3 Design and function
3.1 Unit description
The indoor unit on the split-design compact wall
chests serves to extract heat from the indoor room
being cooled. The outdoor unit then expels this
heat to the outside.
If combined heating/cooling units are operated as
heaters, the heat absorbed by the outdoor unit can
be discharged by the indoor unit into the room
being heated.
The unit is designed to be mounted high up on the
wall, in an indoor area. It is operated by an infrared
remote control.
The indoor unit consists of a fin evaporator, evapo-
rator fan, controller and condensate tray. The
indoor unit can be combined with REMKO outdoor
units from the MVT 602 DC-1402 DC range that
provide sufficient combination options. The outdoor
unit is controlled by the regulation of the indoor
unit.
Condensate pumps are available as accessories.
B
A
4
5
6
1
2
3
7
8
9
3
Fig. 2: System layout
A: Outdoor area
B: Indoor area
1: Indoor unit
2: Outdoor unit
3: Condensate drainage line
4: Condenser fan
5: Power supply
6: Shut-off valve
7: Suction pipe
8: Control line
9: Injection pipe
Refrigerant piping is used to connect the indoor
unit to the outdoor unit.
2
1
4
3
Fig. 3: Cooling cycle schematic
1: Evaporator
2: Evaporator fan
3: Suction pipe connection
4: Injection pipe connection
9

4 Operation
4.1 General notes
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 man-
ually operated.
Manual mode
The indoor unit can also be started manually.
Press the button next to the LED’s to activate auto-
matic mode.
The following settings apply for manual operation:
Pressing once: Automatic mode,
Pressing twice: Cooling test mode, active for 30
minutes
Pressing three times: Unit OFF
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 mark-
ings). Removing the batteries causes all stored
data to be lost. The remote control will then access
the default settings, which you are free to cus-
tomise at any time.
max. 6 m
Fig. 4: Maximum distance
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 func-
tion is excluded from our recommendation!
REMKO MXT
10

Connection of the optional wired remote con-
trol KFB-3
The wired remote control, type KFB-3, can be con-
nected to the devices of the series MXT 263-523.
You need the connection cable that is part of the
delivery scope of the wired remote control for this.
The indoor units are ready to be plugged in for
connection.
The mating connector on the indoor unit can be
found below the electrical connection (Fig. 5). The
plug is colour-coded with the letters A to D.
Fig. 5: Connection KFB-3
4.2 Display on indoor unit
Display
2
1
4
3
5
Fig. 6: Display
1: Receiver infrared signal
2: Operating lamp (green)
3: Timer (yellow)
4: (Pre) heater function/defrosting (green)
5: Manual mode
11

4.3 Manual air distribution
Setting the air distribution
The vertical air control blades can be manually
moved to the left and right (s. Fig. 7). An automatic
swing function is also available for horizontal air
distribution (s. Chapter “Buttons on the remote
control”).
Fig. 7: Setting the air distribution
Setting of the air outlet
The air outlet on the device can be set for
improved comfort. The units can blow out air on
the top and bottom sides. Proceed as follows to
change the settings:
1. Switch the unit off and open panel (s. Fig. 8)
2. The switch to select the blow-out direction
can be found below the LED's (s. Fig. 9)
3. If the switch is set to the symbol [A] (s. Fig. 9)
the indoor unit automatically determines the
blow-out side depending on the mode/situa-
tion (s. Table
Ä on page 13).
4. The unit only blows out the top side in the
operating mode “Dehumidify”.
5. Switch the selector switch to position [B] to
stop the unit blowing out from the bottom
side (s. Fig. 9). The unit only now blows out
the top side, depending on which operating
mode is set. Be aware that the unit must be
switched off before the change can take
effect.
Fig. 8: Opening front panel
1
AB
Fig. 9: Blow-off direction switch
1: Blow-off direction switch
A: Switch setting [A]
B: Switch setting [B]
REMKO MXT
12

Automatic selection of the blow-out side
Operating mode Cooling mode Heating mode
Situation
When the setpoint
is reached or after
1 operating hour.
When the unit is
started or when the
setpoint is not
reached.
The unit blows out
from the top and
bottom side when
the setpoint is
nearly reached to
optimally distribute
the warm air.
When the unit is
started or when the
room temperature
is low.
Blow-out direction
The unit only blows
out from the top to
avoid direct contact
between persons
and air flow.
The unit blows out from the top and
bottom to reach the corresponding set-
point as quickly as possible.
The unit only blows
out from the top to
avoid direct contact
between persons
and air flow.
13

4.4 Keys on the remote control
6
8
11
147
9
10
12
13
2
1
4
3
5
Fig. 10: Keys on the remote control
1
"ON/OFF" key
Press this key to switch the air conditioning unit on
and off.
2
"MODE" key
Operating mode selection. This key is used to set
the desired operating mode. The automatic,
cooling, dehumidification, heating and recirculation
modes are available.
3
"FAN" key
Fan speed Use this key to select the desired fan
speed. The automatic, low, medium and high func-
tions are available. Note: In the dehumidification
operating mode, the fan speed cannot be set man-
ually.
4
"SLEEP" key
Activates/deactivates the "SLEEP" function.
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.
5
"FRESH" key
Press this key to activate/deactivate the ion gener-
ator (air freshener).
6
"TURBO" key
Activation of the turbo function makes it possible to
reach the setpoint in cooling or heating mode as
fast as possible.
7
"SELF CLEAN" key (optional)
This activates the self-clean function on the unit.
8
"UP ARROW" and "DOWN ARROW" keys
Press this key to increase the setpoint in steps of 1
°C up to a maximum of 30°C.
Press this key to decrease the setpoint in steps of
1°C to a minimum of 17°C.
9
„SILENCE/FP“ key
Activates/deactivates the silent mode. Pressing the
key for longer than 2 seconds activates the unit's
frost protection function.
In silent unit mode, the compressor runs at a lower
frequency, and the indoor unit fan rotates at a
slower speed. This obtains particularly silent unit
operation.
The frost protection function can only be activated
in heating mode. The unit operates with a fixed
setpoint of 8°C. The indoor unit displays "FP".
Pressing the ON/OFF, SLEEP, FP, Mode, FAN or
up or down arrow key, the frost protection function
is deactivated. Press the this key to activate the
unit start delay time.
REMKO MXT
14

10
"TIMER ON" key
This key initiates the automatic switch-on time for
the unit. Each press of this key increases the delay
time by 30 minutes. When the set time on the dis-
play exceeds 10.0, each press of the button
increases the set time by 60 minutes. To deacti-
vate the delay time, set the time to 0.0.
11
"TIMER OFF" key
This key can be used to program the delayed
switch-off time. Each press of this key increases
the switch-off time by 30 minutes. When the set
time on the display exceeds 10.0, each press of
the button increases the set time by 60 minutes.
To deactivate the switch-off time, set the time to
0.0
12
3-D swing mode
Press this key to start or stop the swing mode.
With the 2-point key, you can adjust the horizontal
fin on the left side and the vertical fin on the right
side. Press this key once to change the angle by 6
degrees. Pressing the key for 2 seconds stops the
swing function. When the swing function is
stopped, LC appears on the display for three sec-
onds.
13
"FOLLOW ME" key
This key can be used to activate/deactivate the
FOLLOW ME function. In this mode, the room tem-
perature is measured on the remote control. This
sends a signal to the indoor unit every 3 minutes. If
the remote control does not send a signal to the
indoor unit for 7 minutes, this mode is automati-
cally deactivated.
14
"LED" key
This activates/deactivates the display on the indoor
unit.
Indicators on the LCD
2
1
4
36
9
8
10
5
7
11
13 12
Fig. 11: Indicators on the LCD
1: Mode display - shows the current operating
modes including Auto ( ), Cooling( ), Dehu-
midifying ( ), Heating ( ), Fan ( ) and back
to Auto ( ) mode.
2: Signal transmission symbol. This symbol
appears when signals are being transmitted
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: ECO function (not available)
6: TIMER OFF symbol. This symbol appears
when TIMER OFF is switched on.
7: Battery status (weak)
8: Sleep symbol. This symbol appears when the
"Sleep" function is activated. Pressing this key
again causes the indicator to go out.
9: Temperature/Timer symbol. Shows the tem-
perature 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.
10: FOLLOW ME symbol. This symbol appears
when the "Follow me" function is activated.
11: Ion generator display active (optional)
12: 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"
when either "Auto" or "Dehumidification" mode
is activated.
13: Silent mode active (optional)
15

The illustration of the LCD with all of the sym-
bols present is only intended to provide a
clearer overview. During operation, only those
symbols relevant to the respective functions
appear on the display.
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 the air
conditioning unit on.
1
3
2
Fig. 12: "Auto" mode
In "automatic" mode, the cooling unit automati-
cally selects among cooling, recirculation and
heating operation and tries to reach the set-
point set on the remote control
"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 oper-
ating modes "Cooling", "Heating" or "Recircu-
lation".
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 the air
conditioning unit on.
1
4
2
3
Fig. 13: "Cooling", "Heating" and "Recirculation"
mode
REMKO MXT
16

"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.
1. Press the "MODE"key to select "Dehumidi-
fying" mode.
2. The temperature setting on the remote con-
trol has no effect on unit operation.
3. Press the "ON/OFF"key to switch the air
conditioning unit on.
1
3
2
Fig. 14: "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
1. Press the "TIMER ON" key. The remote con-
trol 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 con-
trol 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.
2
1
Fig. 15: "Timer" mode
17

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 con-
trol 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)
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 oper-
ating time setting for the timer, and the "H"
symbols, appear on the display.
2. Press the "TIMER ON" key until the desired
start time is shown in the "TIMER ON" area
on the remote control.
3. Wait for 3 seconds and the temperature
appears again in this area of the digital dis-
play. The "TIMER ON" indicator stays lit, and
this function is activated.
Start
Off
2 hours laterSet time
Fig. 16: "TIMER ON" example
"TIMER OFF" (Auto off mode)
Example:
You want the air conditioning unit to switch off 4
hours from the time it was programmed.
1. Press the "TIMER OFF" key. The last oper-
ating 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 3 seconds and the temperature
appears again in this area of the digital dis-
play. The "TIMER OFF" indicator stays lit,
and this function is activated.
Stop
On
4 hours laterSet time
Fig. 17: "TIMER OFF" example
REMKO MXT
18

Combined TIMER (setting "TIMER ON" and
"TIMER OFF" at the same time)
"TIMER OFF ð "TIMER ON"
(On ð Stop ð Start)
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 the
desired stop time 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 3 seconds and the temperature
appears again in this area of the digital dis-
play. The "TIMER ON" and "TIMER OFF"
indicators stay lit, and this function is acti-
vated.
On
Set time
Stop
Start
2 hours later
after setting 10 hours later after setting
Fig. 18: "TIMER OFF" / "TIMER ON" example
"TIMER ON ð "TIMER OFF"
(Off ð Start ð Stop)
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 3 seconds and the temperature
appears again in this area of the digital dis-
play. The "TIMER ON" and "TIMER OFF"
indicators stay lit, and this function is acti-
vated.
Off
Set time
Stop
Start
2 hours later
after setting 5 hours later after setting
Fig. 19: "TIMER ON" / "TIMER OFF" example
19

SLEEP function
The sleep function saves energy while you sleep.
This function is activated by pressing the key on
the remote control. Press the key before going to
sleep. In cooling mode, the unit automatically
increases the set room temperature by 1 °C after 1
hour. After one more hour, the room temperature is
increased by an additional 1 °C. In heating mode,
the room temperature is decreased within the first
two hours of operation by 2°C. After 7 hours of unit
operation, the unit switches automatically off in
cooling and heating mode.
This function is not available in the recirculation
and dehumidification operating modes!
1
Fig. 20: "Sleep" function
Setpoint After 7 hours
unit OFF
1 hr 1 hr
Fig. 21: Sleep function
5 Installation instructions
for qualified personnel
Important notes prior to installation
Observe the operating manuals for the indoor unit
and the outdoor unit when installing the entire
system.
nTransport the unit in its original packaging as
close as possible to the installation location.
You avoid transport damage by doing so.
nCheck the contents of the packaging for com-
pleteness and check the unit for visible trans-
port damage. Report any damage immediately
to your contractual partner and the shipping
company.
nLift the unit on the corners and not on the
refrigerant or condensate drainage connec-
tions.
nThe refrigerant piping (injection and suction
pipe), valves and connections must be insu-
lated against vapour density. If necessary also
insulate the condensate drainage line.
nSelect an installation location which allows air
to freely flow through the air inlet and outlet
(see section "Minimum clearances").
nDo not install the unit in the immediate vicinity
of devices which generate intensive thermal
radiation. Installation in the vicinity of thermal
radiation reduces the unit output.
nInstall the refrigerant piping from the indoor unit
to the outdoor unit.
nSeal off open refrigerant piping with suitable
caps or adhesive strips to prevent the infiltra-
tion of moisture and never kink or compress
the refrigerant piping.
nOnly use the union nuts supplied with the
refrigerant piping. These should only be
removed shortly before connecting the refrig-
erant piping.
nCarry out all electrical wiring in accordance
with applicable DIN and VDE standards.
nEnsure the electrical cables are properly con-
nected to the terminals. Otherwise there is a
risk of fire.
Installation materials
The indoor unit is attached to the wall by a wall
bracket and 4 screws (to be provided by the cus-
tomer).
Selection of installation location
The indoor unit is designed for horizontal wall
installation at floor level.
REMKO MXT
20