REMKO RXD User Manual

REMKO RXD

RXD 260, RXD 350, RXD 520, RXD 680, RXD 1200

Ceiling cassettes

Operation · Technology · Spare parts

Issue GB – T10

Contents

Safety notes

Environmental protection and recycling

Warranty

Transport and packaging

Description of the equipment

Combinations

Operation

Shutdown

Care and maintenance

Troubleshooting and customer service

Installation instructions for qualified personnel

Installation

Condensation connection

4

4

4

5

5

5

6-11

12

12-13

14-15

15-16

16-19

20

Electrical connection

Electrical connection diagram

Electrical circuit diagram

Commissioning

Unit dimensions

Product illustration

Spare parts lists

Technical data

These operating instructions should be read carefully
prior to commissioning / operation of the equipment!

20-21

21

22

23

23

24-25

24-25

26

Made by REMKO

These instructions are part of the equipment and must always
be kept in the vicinity of the installation or on the equipment

Subject to modifications; No liability accepted for errors or misprints!

3

REMKO RXD

4

Safety notes

Carefully read this manual before
starting the unit for the first time.
It contains useful tips, information

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 as well as

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, aggressive 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 or components

should not be exposed to any
mechanical stresses, extreme
levels of humidity or direct
exposure to sunlight.

Environmental
protection and
recycling

Disposal of packaging

All products are packed for
transport in environmentally
friendly materials. Make a valuable
contribution to reducing waste
and sustaining raw materials. Only
dispose of packaging at approved
collection points.

Disposal of old
equipment

Our production facility is subject
to continuous quality control.
Only high-grade materials are
processed, the majority of which
are recyclable. 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

Prerequisite for any warranty
claims is that the purchaser or his
client has completely filled out the
"warranty registration card" and
commissioning report included
with the unit at the time when
the equipment was purchased
and commissioned and returned
these papers to REMKO GmbH &
Co. KG. 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.

Transport and

5

packaging

The equipment is 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.
No warranty can be assumed for
later claims.

Description of the
equipment

The indoor unit on the split-design
combined room air conditioning
units serves to extract heat from
the indoor room being cooled. The
outdoor component then expels
this heat to the outside.
If combined heating/cooling
units are operated as heaters, the
heat absorbed by the outdoor
component can be discharged
by the interior unit into the room
being heated.
The unit is designed for
suspended ceilings with Euroraster
dimensions. The cassette is hidden
behind the suspended ceiling, only
its cover is visible. It is operated via
an infrared remote control.
The indoor unit consists of a fin
vaporiser, vaporiser fan, regulation
system and condensation pan.
The indoor unit can be combined
with REMKO outdoor components
that provide sufficient cooling
output. The outdoor component is
controlled via the regulation of the
indoor unit.
Condensation pumps and wired
remote controls are available as
accessories.

Schematic of refrigerant circuit

Vaporiser fan

Vaporiser

System design

Indoor area

Indoor unit with
Cover

Outdoor area

Condensation pipe

Condensation

pipe

Outdoor component

Connection to suction pipe

Connection to injection pipe

Control cable

Injection pipe

Mains cable

Suction pipe

Stop valve
Liquefier fan

Refrigerant pipes are used to connect the indoor unit to the outdoor
component.

Combinations

Cooling / heating

RXS 261H
RXS 351H
RXS 521H
RXS 681H
RXS 1200H

Cooling

RXM 226
RXM 235
RXM 252
RXM 268
RXM 326
RXM 335
RXM 426
RXM 435

RXD 260 RXD 350

•

•

RXD 260 RXD 350

••

••

•• •

•••

••••

••••

RXD 520

•

RXD 520

••

RXD 680 RXD 1200

•

RXD 680 RXD 1200

••

•

REMKO RXD

6

Operation

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.

Display on indoor unit

Manual operation

The indoor units can be started
manually.
Press the RESET button on the
receiver unit of the cover to
activate automatic mode. In manual
operation, the following settings
apply:

Cooling mode: 24 °C,
Fan speed: AUTO
Heating mode: 26 °C,
Fan speed: AUTO

Pressing any button on the infra­red remote control interrupts
manual operation

Infrared remote control

The infrared remote control
sends the programmed settings
at a distance of up to 6 m to the
receiver on the interior 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 insert the supplied batteries (2
each, type AAA) into the remote
control. To do so, remove the
cover on the battery compartment
and insert the batteries. Take into
account the correct polarity (see
markings).

Max. distance 6 m

The lit display LEDs indicate the settings.

LED H red = high fan speed
LED M yellow = medium fan speed
LED L green = low fan speed

Display on indoor unit

Unit for receiving signals
from the remote control

CAUTION

Problems are shown in code

(see chapter on trouble-

shooting and customer

service).

LEDHLEDMLEDLRESET button

max. 6 m

Manual operation

NOTE

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.

Buttons on the remote control

7

Buttons on the remote control

"POWER" button

Press this button to start the
unit.

"TEMP" Button

Press this button to set the

desired temperature in 1 °C
steps within the range 16 °C to
30 °C.

"TIME-SET" Button

Press this button to set the

time.

"MODE" button

Press this button to select the
operating mode. The indoor unit
has 5 modes:

1. Automatic mode
(COOL/HEAT):
In automatic mode, the
temperature is maintained at
the target temperature.

"SWING" Button

This button switches on the

oscillating fins to provide
improved air distribution in the
room. It can also be used to
lock the fins.

"FAN" button

Press this button to set the

required fan speed. 4 levels
are available: Automatic, high,
medium and low fan speed.

"TIME-OFF" Button

This button is used to program

the automatic switch-off
function for the indoor unit.

"TIME-ON" Button

This button is used to program

the automatic switch-on
function for the indoor unit.

"C" Button

Press this button to activate the

time setting.

2. Cooling mode (COOL):
In cooling mode, the warm
room air is cooled to the lower
preset target temperature.

3. Dehumidifying mode (DRY):
In this mode the room is mainly
dehumidified.

4. Circulation mode (FAN)
In circulation mode only the
air is circulated. The room
temperature is not controlled.

5. Heating mode (HEAT):
(only for RXS...H)
In heating mode the cold room
air is heated to the preset higher
temperature.
This mode should not be used
on RXM units (malfunctions may
occur)!

"R" Button

Press this button to reset the

remote control to its factory
default configuration.

"NETWORK" Button

This button has not been

assigned a function.

"SLEEP" Button

Pressing this button will

automatically increase or
decrease the target temperature
by 1 °C within an hour in
cooling and heating mode
respectively.

REMKO RXD

8

Button functions

A symbol is shown on the display to indicate that the settings are being transferred.

POWER Button

TEMP Button

Press the POWER button to activate/deactivate the indoor unit. The
programmed settings and adjustment values before the unit was turned
off will appear in the display.

POWER

The TEMP button is used to set the desired target temperature in 1 °C
steps. This setting is not supported in FAN circulation mode.

TEMP TEMP

TIME Button C

RESET Button R

Use a small pen or similar to press recessed button C, the time will flash
on the display. Press and hold the TIME-SET button to, at first slowly,
and then quickly adjust the clock time. Once it has been set, press the C
button again to save the time. The display will stop flashing.

TIME-SETC C

Setting the clock

Use a small pen or similar to press recessed button R. All the symbols will
appear on the display. After approx. 5 seconds only the time will flash on
the display. After pressing recessed button C, press and hold the TIME­SET button to set the time. Once it has been set, press the C button
again to save the time. The display will stop flashing.

R 5 sec. C

MODE Button

9

Press the MODE button to change to another mode. A total of 5 modes
are available:

1. Automatic Automatic selection of cooling or heating operation

2. Cooling Cooling mode, predominantly used during summer

3.

Dehumidification

Dehumidifying mode, used in summer or winter

4. Air circulation Circulation mode, no cooling or heating output

5. Heating Predominantly used during winter (only for RXS...H)

MODE MODE MODE MODE

Mode AUTO

Mode COOL

Press the MODE button once or repeatedly to switch to automatic mode.
In this mode, the regulation automatically selects COOL or HEAT mode
depending on the temperature. The temperature is then maintained at
the set value. This function should only be used on RXS...H units. Only
cooling mode is activated on RXM units; heating mode is not supported.
The FAN should be set to AUTO.

Set temperature is below the
room temperature

Set temperature is above the
room temperature

MODE

TEMP

COOLING

or

HEATING

Press the MODE button once or repeatedly to switch to cooling mode.
Use this mode to cool the room air to the desired target temperature.

Press the TEMP ▲/▼ buttons to set the desired room temperature
in 1 °C steps. If the room temperature is 1 °C above the desired
temperature and sufficient coolant is available, the indoor unit will start
to cool the room air. f the actual temperature falls approx. 0.5 °C below
the set room temperature, the controller switches the cooling off.

TIP

It is recommended that the
target temperature is set to
max 6 °C below the outdoor
temperature. The automatic
fan speed and swing functions
should also be used.

MODE

COOLING MODE

REMKO RXD

10

Mode DRY

Mode FAN

Press the MODE button once or repeatedly to switch to dehumidifying
mode. Use this mode to dehumidify the room in an unregulated fashion.
After pressing the DRY button, select the desired temperature and fin
position. It is not possible to set the fan speed. The fan is switched off at
certain intervals to lower the temperature at the cooling battery. The low
temperature causes the air temperature at the fins to fall below the dew
point. Excess humidity in the air condenses on the cooling battery and
the room is dehumidified.

MODE

DEHUMIDIFYING MODE

Press the MODE button once

TIP

or repeatedly to switch to
circulation mode. In this mode,
the equipment is used as an
air circulation unit. The room is
neither heated nor cooled.

MODE

This mode is used in winter
to circulate the heat trapped
under the ceiling to the lower
regions of the room.

CIRCULATION MODE

SWING Button

Mode HEAT

NOTE

The SWING button is used to provide continual and automatic vertical
adjustment of the fins. This facilitates improved distribution of the cooled
air inside the room. If the SWING button is pressed during the swing
motion, the fins stop in their current position. Pressing the button again
resumes the swing motion.

SWING SWING

SWING SWING SWING SWING

Press the MODE button once or repeatedly to switch to heating mode.
Use this mode to heat the room air to the desired target temperature.
This function should only be used on RXS...H units. Only cooling mode is
activated on RXM units; heating mode is not supported.

The fan will only start when the fin temperature reaches 38°C.

Press the TEMP ▲/▼ buttons to set the desired room temperature
in 1 °C steps. If the room temperature falls 1 °C below the set target
temperature, heating mode is activated. f the actual temperature rises
approx. 1 °C above the set room temperature, the controller switches the
heating off.

It is recommended that the
target temperature is set to
max. 28 °C. Maximum fan
speed and the lowest fin
setting should also be used.

MODE

HEATING MODE:

TIME Buttons

11

Switch-on time

Switch-off time

The TIME-ON/-OFF buttons are used to program the switch-on/off time,
the TIME-SET button to set the time.

Press the TIME-ON or TIME-OFF button to activate the timer. The clock
display then disappears. The timer symbol for the switch-on/off time will
flash. Press the TIME-SET button to set the desired switch-on/off time in
10 minute steps.

After programming has been completed, the settings are transmitted to
the indoor unit. For delayed switch-on press the TIME-ON button, for
delayed switch-off press the TIME-OFF button. The timer symbol will
stop flashing and the indoor unit beeps to acknowledge the programmed
parameters.

When the programmed time has been reached, the device is
automatically turned on or off. If the indoor unit is automatically
switched on, then the mode, temperature and fan speed for the last
setting is reactivated.

The switch-on/off time can be prematurely cancelled by pressing the
appropriate TIME button or POWER button

Switch-on time

TIME-ON TIME-SET TIME-ON

SLEEP Button

NETWORK Button

Switch-off time

TIME-OFF TIME-SET

TIME-OFF

After the SLEEP button is pressed, the symbol is shown on the display
and the room temperature is raised or lowered by 0.5 °C in cooling and
heating mode respectively 30 minutes after the function starts up. After
a further 30 minutes the room temperature is raised or lowered by 1 °C
in cooling and heating mode respectively. After a further hour the room
temperature is held at a constant 2°C above or below the original target
temperature in cooling and heating modes respectively. The temperature
is then maintained at a constant level. This function is disabled by pressing
the POWER or SLEEP button. The symbol on the display goes out.

COOLING

SLEEP SLEEP

MODE

HEATING

SLEEP SLEEP

MODE:

The NETWORK button on RXD units has not been assigned a
function.

REMKO RXD

12

Shutdown

Temporary shutdown

1. Allow the indoor unit to run
for 2 to 3 hours in circulation
mode or in cooling mode at the
maximum temperature setting
in order to remove any residual
moisture from the unit.

2. Shut down the unit using the
remote control.

3. Switch off the voltage supply to
the unit.

4. Check the unit for visible
signs of damage and clean as
described in the chapter "Care
and maintenance".

Permanent shutdown

Ensure that equipment and
components are disposed of
accordance with local regulations,
e.g. through authorised disposal
and recycling specialists or at
collection points.

Contact REMKO GmbH & Co. KG
or your contract partner for a list
of specialist companies near you.

Care and maintenance

Regular care and observation
of some basic points will ensure
trouble-free operation and a long
service life.

CAUTION

Prior to performing any work,
ensure the equipment is
isolated from the voltage
supply and secured to prevent
accidental switch-on!

Care

■

Ensure the unit is protected
against dirt, mould and other
deposits.

■

Clean the unit using a damp
cloth. Do not use any caustic,
abrasive or solvent-based
cleaning products. Do not use
a jet of water.

■

Clean the fins on the unit prior
to long shutdown periods.

Maintenance

■

It is recommended that you
take out a maintenance
contract with an annual service
from an appropriate specialist
firm.

TIP

This ensures the operational
reliability of your equipment!

Cleaning the cover of the
indoor unit

1. Disconnect the supply voltage
to the equipment.

2. Open and fold down the air
inlet guard on the cover. The
filter is held in place by the flaps
screwed in at the side of the
guard (Page 13, Fig. 1).

3. Clean the guard using a soft,
damp cloth.

4. Switch the supply voltage back
on.

Type of task

Checks / maintenance / inspection

General

Measure voltage and current

Check fan is functioning correctly

Dirt on vaporiser

Check condensation drain

Test insulation

Check moving parts

Commissioning

Monthly

Six-monthly

• •

• •

• •

• •

• •

• •

• •

Yearly

Air filter for indoor unit

13

Clean the air filter at intervals of
no more than 2 weeks. Reduce this
interval if the air is especially dirty.

9. Switch the supply voltage back
on.

10.

Switch the unit back on.

1 Guard on cover

Cleaning the filter

1. Disconnect the supply voltage
to the equipment.

2. Open and fold down the air
inlet guard on the cover. The
filter is held in place by the flaps
screwed in at the side of the
guard (Fig. 1).

3. Tilt the filter to lift it out (Fig. 2).

4. Clean the filter using a normal
vacuum cleaner (Fig. 3). Turn
the dirty side until it faces up.

5. Any dirt can be cleaned off
using lukewarm water and mild
cleaning agents.
To do so, turn the dirty side
downward (Fig. 4).

Cleaning the condensation
pump

The indoor unit includes a built-in
condensation pump, for pumping
the condensation to a drain at
a higher level.

The pump is more or less
maintenance free. The condensation
pipes should be checked for dirt
at regular intervals. Clean them as
required.

If an external pump is also used,
observe the maintenance and care
instructions given in the separate
operating manual.

2 Pull out the filter

3 Clean with a vacuum cleaner

6. When using water, allow the
filter dry out properly in air
before replacing it in the unit.

7. Carefully insert the filter. Make
sure it is seated correctly.

8. Close the cover as described
above but in reverse order.

4

Cleaning with lukewarm water

REMKO RXD

14

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. For installations with an indoor unit and outdoor component, refer to the chapter "Troubleshooting
and customer service" in both manuals. Please inform your dealer if the unit is still not working correctly after all
the functional checks have been performed!

Malfunction

Fault Possible cause Checks Remedial measures

The unit does not start
or switches itself off

The unit does not respond
to the remote control

Power outage, undervoltage,
defective mains fuse / main circuit
breaker switched off

Damaged mains cable

Waiting time after switch-on too short

Temperature outside operating range.

Overvoltages caused by thunder
storms

Fault in external condensation pump

Transmission distance too far /
receiver affected by interference

Defective remote control Is the unit running in manual mode? Replace the remote control

Receiver or transmitter unit exposed
to excessive solar radiation

Electromagnetic fields are interfering
with transmission

Button in remote control jammed /
two buttons pressed at same time

Batteries in remote control are flat

Filter is unclean / air inlet / outlet
blocked by foreign items

Are all other electrical installations
functioning correctly?

Are all other electrical installations
functioning correctly?

Have approx. 5 minutes
elapsed since the restart?

Are the fans in the indoor unit
and outdoor component working
correctly?

Has there recently been lightning?

Did the pump shut down due to a
fault?

Does the indoor unit beep when
pressing a button?

Does it function correctly in the
shade?

Does it function when switching off
possible sources of interference?

Does the “Send” symbol appear on
the display?

Have new batteries been inserted? Is
the display incomplete?

Have the filters been cleaned? Clean the filters

Check voltage, possible wait until
turned on again.

Repair by a specialist

Schedule longer waiting periods

Take into account the temperature
range for the indoor unit and outdoor
component

Switch off the mains breaker and
switch it back on. Have it checked by
a specialist

Check and if necessary clean the
pump

Reduce the distance to less than 6 m
or change position

Place the receiver&transmitter unit in
the shade

Signal is not transmitted when
interference sources are operational

Release the button / only press one
button

Insert new batteries.

The unit is running
but only provides
reduced cooling / heating
performance

Condensation discharge
on unit

Icing up of
unit

Windows and doors open. Heating/
cooling output increases

Neither cooling nor heating mode has
been set

Fins on outdoor component blocked
by foreign items

Leaking refrigerant circuit

Outdoor component iced up

Drainage pipe on collection container
clogged / damaged

Faulty external condensation pump
or float

Condensation has not drained away
and has collected in the condensation
pipe

Condensation does not drain off

Float is stuck or jammed due to
excessive dirt.

In conjunction with RXM:
Heating/automatic mode set

Have there been any constructional /
application-related changes?

Does the cooling symbol appear on
the display?

Is the fan on the outdoor component
running? Are the fins unobstructed?

Are there signs of frost on the fins of
the indoor unit?

Check outdoor component. Has
the cassette sensor on the outdoor
component been correctly positioned?

Can the condensation drain off
without any obstruction?

Is the collection tray full of water and
the pump not running?

Is there a steady fall on the
condensation pipe? Check there is no
blockage in the pipe.

Are the condensation pipes unblocked
and is there a steady fall? Are the
condensation pump and float switch
functioning correctly?

Are the LEDs on the receiver unit of
the indoor unit flashing?

Check mode setting Set cooling mode

Close windows and doors / install
additional units

Correct the settings for the unit

Check the fan or winter controller,
reduce the air resistance

Repair by specialist

De-ice and fit the sensor at the point
where the most ice forms

Clean the drainage pipe and collection
container

Call out a specialist to replace the
pump

Ensure there is a fall when laying the
condensation pipe and clean the pipe.

The condensation pipe must have
a fall. If necessary, clean the pipe. A
faulty condensation pump and float
switch should be replaced.

Should be cleaned by specialist firm

Error and operational malfunction indicated by flashing code

15

H

(red)M (yellow)L (green)

on Fan at max. speed Normal operating condition

on Fan at medium speed Normal operating condition

on Fan at low speed Normal operating condition

flashes Heating mode: Warm-up phase Wait approx. 1 minute

flashes Heating mode: Cool-down phase Wait approx. 1 minute

flashes on Heating mode: De-frost phase Normal operating condition

on flashes flashes Sensor on vaporiser faulty / tripped Contact specialist dealer

flashes Cooling mode: De-frost phase Normal operating condition

flashes on Heating mode: Overheating protection has tripped Wait approx. 1 minute

flashes flashes Sensor on outdoor components faulty / tripped Contact specialist dealer

flashes flashes Sensor air circulation faulty / tripped Contact specialist dealer

flashes on flashes Low pressure fault (external only) Contact specialist dealer

flashes flashes High pressure fault (external only) Contact specialist dealer

flashes flashes on No difference frost protection/circulation sensor Contact specialist dealer

flashes flashes flashes Condensation pump float switch faulty/tripped Contact specialist dealer

Cause Required action

Installation instructions for qualified personnel

Important points prior to
installation

■

Observe the manuals for
the indoor unit and outdoor
component when installing the
entire system.

■

Transport the unit in its original
packaging as close as possible
to the installation location to
avoid transport damage.

■

Check the contents of the
packaging for completeness
and check the unit for visible
transport damage. Report
any damage immediately to
your contracting party and the
shipping company.

■

Lift the unit at the corners
and not by the refrigerant or
condensation connections.

■

The refrigerant pipes (injection
and suction pipe), valves and
connections must be insulated
impervious to 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 in
the immediate vicinity of
devices with intensive thermal
radiation. Installation near
sources of thermal radiation
reduces the output of the unit.

■

Seal off open refrigerant pipes
with suitable caps or adhesive
strips to avoid infiltration of
moisture and never kink or
compress the refrigerant pipes.

■

Only use the union nuts for the
refrigerant pipes included in
the delivery, and remove them
shortly before connecting the
refrigerant pipes.

■

Establish all electrical
connections in accordance with
the relevant DIN- and VDE
standards.

■

See electrical connection
diagram Always properly
insert electrical cables into the
electrical terminals. Otherwise
a fire could result.

REMKO RXD

16

■

Service openings should be
provided in the suspended
ceiling to allow maintenance
access to the control box.

■

Any ventilation ducts or pipes
and connection fittings, which
are used to connect a second
room or supply fresh air, should
be insulated with diffusion-tight
material.

Installation material

The indoor unit is fastened using
4 threaded rods (provided by the
customer) at the side mounts.

In order to complete the
installation, wall plugs, trapezoidal
sheet metal supports, steel profiles,
fixing clamps for refrigerant and
condensation pipes (as well as
laying ducts) and connection
fittings for condensation pipes are
also required.

Selection of the installation
location

The indoor unit is designed
for horizontal mounting in
suspended ceilings with Euroraster
dimensions. It can also be installed
in other types of suspended
ceilings with different dimensions.

Take into account the installation
height of the equipment.

Installation

Minimum clearances

Observe the minimum clearances to allow access for maintenance and
repair work and facilitate optimum air distribution.

Minimum clearances

300

300

300

300

300

300

300

NOTE

Installation should only be
performed by authorised
specialists.

Unit installation

The unit is mounted face down
on four threaded rods. Take into
account the ceiling grid and any
other installations.

1. Use the dimensions of the
ceiling cassette to mark the
fixing points for the threaded
rods on structural parts
approved to support the static
load above the suspended
ceiling.

2. Fit any connection nozzles
before installing the unit
if connections to a second
room or a fresh air intake are
required.
See section Connections to
a second room or a fresh air
intake.

300

300

300

All values in mm

3. Fit the indoor unit onto the
threaded rods and use the
lower nuts to level the unit
(Fig 5 and 6).

4. Make sure that clearance A,

17

as specified in the table below,
is provided between the
underside of the suspended
unit and the underside of the
fastening surface. Connect
the refrigerant pipes, electrical
cables and condensation pipe
to the indoor unit as described
below (Fig. 7).

5 Hooking in the unit

Structural component

6 Mounting the unit

RXD 260-520

5. Check that the unit is level.

6. The final task is to tighten the
counternuts and attach the
cover.

RXD 680-1200

Connection of refrigerant
pipes

The refrigerant pipes are
connected to the RXD 260-520 on
the angled side of the unit and on
the RXD 680-1200 in the middle
of the longer side.

It may be necessary to fit a
reducer or flared adapter to the
indoor units. These fittings are
included as standard with the
indoor unit. Once installed, the
connections should be made tight
against vapour diffusion.

CAUTION

The units are factory filled with
dry nitrogen to check for leaks.
The pressurised nitrogen is
released when loosening the
union nuts.

280

615

7 Fastening the unit

Structural component

A

B

Dimensions in mm

Distance A 35 mm

RXD

260

RXD

350

RXD

520

810

All values in mm

RXD

680

RXD

1200

615

Distance B 25 mm

Mounting the unit 615 x 280 mm 615 x 810 mm

REMKO RXD

18

Connections to adjacent room
and fresh air intake

The indoor unit has been designed
to allow the cooling of a second
room as well as the intake of fresh
air.

CAUTION

It is only permitted to connect
one fresh air intake and one
adjacent room!

Installation instructions

Proceed as follows to make the
connections to a second room and
the fresh air intake:

1. Please note that the vaporiser
fins are located directly behind
the cover being removed. These
should not be damaged under
any circumstances (Fig. 8).

Connections to adjacent room and fresh air intake

Fresh air intake

Connection to
adjacent room

Connection to
adjacent room

8 Remove the cut-out 9

Connection to
adjacent room

Fresh air intake

Connection to
adjacent room

Fresh air intake

Carefully remove the insulation

2. Carefully remove the insulation
behind the opening (Fig 9).

3. Break through the appropriate
opening (Fig. 10).

4. Keep the ventilation pipes as
short as possible and lay them
in such as way as to minimise
the amount of bends.

5. The collars, screws, flexible /
folded spiral seam pipes and
insulation materials should be
provided by the customer.
The above items can be
obtained from specialist
suppliers (Fig. 11).

10

Break through the opening

11

Attaching the pipe collar

Connection to adjacent room

19

The indoor unit can also be used
to cool an adjacent room through
a duct system, e.g. hidden behind
a suspended ceiling. The following
conditions must be met:

■

The rated cooling output of the
indoor unit must be sufficient
for both rooms.

■

An opening must be made
between both rooms to allow
the air to circulate.

■

The maximum pipe length of
7 m should not be exceeded.

■

Observe the regional
regulations concerning air
treatment.

■

Fit a collar with a nominal
diameter of 70 mm to the fresh
air intake.

■

The fresh air content should not
exceed 10 % of the nominal
air flow rate for the equipment.
The fresh air supply should
be controlled by an additional
speed-regulated fan.

Connection to adjacent room

■

The air at the outdoor air intake
should be sucked in through
a dust filter at a maximum
rate of 2.5 m/s to prevent the
ingress of rain water.

■

The fan should be connected to
a separately protected electrical
supply (to be provided by the
customer).

■

In order to ensure that the air
is transported to the adjacent
room, close off 1 or 2 of the
four outlets on the cover. Stick
a black single-sided adhesive
fabric strip over the outlet
openings being covered. This
strip must be able to withstand
the effects of a continual air
flow.

Fresh air intake

As already mentioned, the indoor
unit can also be employed to suck
in and regulate the temperature of
fresh (outdoor) air in addition to
room air.
This is the preferred option for
rooms with a high rate of air
consumption.

Fresh air intake

Main room

max. 7 m

Adjacent room

Fresh air
intake

Inside Outside

REMKO RXD

20

Condensation
connection

If the temperature falls below the
dew point, condensation will form
on the cooling fins during cooling
mode.
A collection tray together with
a condensation pump and float
switch are fitted as standard below
the cooling fins. Should the float
switch trip a protective shutdown
due to inadequate removal of
the condensation, the pump will
switch on immediately and run on
for approx. three minutes.

Condensation connection - Wrong! Condensation connection - Correct!

Riser pipe too far away Condensation pipe too large/small

■

The condensation pipe should
have a fall of min. 2 %.
This is the responsibility of
the customer. If necessary,
fit vapour diffusion tight
insulation.

■

If the level of the condensation
pipe on the unit is above
that of the outlet, route the
pipe vertically upwards (max.
1000 mm from the bottom
edge of the unit) and then with
a fall to the drain.

■

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.
If necessary, fit supplementary
pipe heating.

■

Once the pipe has been laid,
check the condensation drains
off and permanently seal it.

min. 2% fall

16-20 mm

No fall Cannot freely drain away

Electrical connection

A protected mains supply cable
and six-core (RXS) or four-core
(RXM) control cable should
be connected to the outdoor
component and indoor unit
respectively.

CAUTION

All electrical installation
work should be performed
by specialist contractors.
Isolate the voltage supply
when connecting the electrical
terminals.

■

We recommend that customers
install a main/repair switch
in the vicinity of the outdoor
component.

■

The terminal blocks for making
the connections are located at
the rear of the unit. When the
unit is installed, measurements
can be made from the front by
removing the cover.

maximum

1,000 mm

max. 100 mm

■

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 switch­off contact on the pump to
switch off the compressor.

Make the following electrical

21

connections:

1. Connect the control cable from
the outdoor component

Make the connection as follows:

1. Open the control box cover by
removing the fixing screws and
lifting off the cover (Fig. 12).

12

Connecting the unit

2 Connection of external

temperature sensor in indoor
unit/outdoor component.

2. Feed the voltage-free cable
through the edge protection
rings on the control box and
clamp the cable in the strain

3. If necessary, connect a fresh air

relief.

fan

3. The connect the cable as shown

4. If necessary, connect an

on the connection diagram.

external condensation pump

4. Connect the electrical

Make all connections inside the
control box. The connection
terminals are at the side of the unit
in the suspended ceiling.

connectors on the cover to
the mating connectors on the
cassette. It is not possible to
incorrectly connect these.

5. Re-assemble the unit.

Electrical connection diagram

Connection of RXS 261-681H

CAUTION

Check all plugged and clamped
terminals to verify they are
seated correctly and making
a permanent contact. Re­tighten as required.

Connection of RXS 1200H

Outdoor componentIndoor unit Mains cable

Phase conductor

Control conductor

Control conductor

Control conductor

O

O

Neutral conductor

3

Compressor contactor

2

Reverse flow valve

1

Fan motor

Earth conductor

O

O

Defrost sensor Outdoor component
should be fitted on the pipe bend in
the lower third of the liquefier.

230 V~,
50 Hz,
L1 / N / PE

Connection of RXM 226-268, RXM 326-335,
RXM 426-435

Outdoor componentIndoor unit Mains cable

Phase conductor

Control conductor

O

O

Neutral conductor

1

Compressor contactor

Earth conductor

Fasten the defrost sensor for the
outdoor component in the control
box of the indoor unit!

230 V~,
50 Hz,
L1 / N / PE

Indoor unit Outdoor component Mains cable

L

N

C

Control conductor

V

Control conductor

F

Control conductor

PE PE PE

HP

HP

LP

LP

O

O

Phase conductor

L1

Phase conductor

L2

Phase conductor

L3

N

Neutral conductor

3

Compressor contactor

2

Reverse flow valve

1

Fan motor

Earth conductor

HP

P

HP

LP

P

LP

O

O

L1

L2

L3

N

High pressure sensor
in outdoor component

Low pressure sensor
in outdoor component

Fit the defrost sensor for the
outdoor component on the pipe
bend in the lower third of the
liquefier.

400 V~,
50 Hz,
L1 / L2 / L3 / N / PE

SM1 SM2 SM3 SM4

Jp12

M

T

JP1

M

N

V

L

C

Ec

F

O

PL

O

HP

HP

LP

Jp11

OPT

Jp9 Jp10 Jp7 Jp8

J 1P

Jp3

5Jp

JpF

pCJ

4pJ

REH REL

UX CA E

Jp6

MF

LF

FH

Jp 31

Jp 41

C UP

M

5Jp

SM5 Sm6

Jp15 Jp16

Jp6

SM1 SM2 SM3 SM4

MF

FL

HF

Jp12

M

T

JP1

M

1Jp 3

N

V

L

C

Ec

F

O

PL

O

HP

HP

LP

Jp11

OPT

Jp9 Jp10 Jp7 Jp8

Jp14

1JP

Jp3

Jp5

FJp

JpC

Jp4

REH REL

AUX EC

CPU

REMKO RXD

22

Electrical circuit diagram

RXD 260 - 520

Vaporiser sensor

Wired

remote control

Air circulation sensor

Swing motor 1-4

Sensor
Defrost

Jumper

Jumper

RXD 680 - 1200

remote control

Display

Display

Condensation float switch

Air circulation sensor

Vaporiser sensor

Wired

Fan

motor

Swing motor 1-6

Transformer

Condensation

pump

Defrost sensor

Bridge LP/LP
and HP/HP only
on RXD 680

Transformer

Float

switch

Condensation

Condensation

pump

Legend

L = Phase conductor
N = Neutral conductor

= Earth conductor
F = Fan motor
C = Compressor control
V = Reverse flow valve

Fan motor

1 and 2

LP/LP = Low pressure sensor (if fitted), external
HP/HP = High pressure sensor (if fitted), external
O = Fit the defrost sensor for the outdoor component (only on RXS...H, install in the lower third of the liquefier)

Commissioning

23

NOTE

Commissioning should only be
performed by specially trained
personnel and documented
after the certificate has been
issued.

Observe the manuals
for the indoor unit and
outdoor component when
commissioning the entire
system.

Functional test for cooling
mode.

1. Switch the supply voltage on.

2. Use the remote control to
switch on the unit and select
the cooling mode, maximum
fan speed and lowest target
temperature.

3. Measure and record all
the required values in the
commissioning report and
check the safety functions.

4. Check the control system
for the unit using the
functions described in the
chapter "Operation". Timer,
temperature setting, fan speeds
and switching to ventilation or
dehumidifying mode.

5. Check the correct function
of the float switch and
condensation pump by
pouring distilled water into the
condensation tray.
A bottle with a spout is
recommended for pouring the
water into the condensation
tray.

Functional test for
heating mode.
(only on RXS.H)

1. Switch the supply voltage on.

2. Use the remote control to
switch on the unit and select
the heating mode, maximum
fan speed and highest target
temperature.

3. Measure and record all
the required values in the
commissioning report and
check the safety functions.

4. Check the control system for
the unit using the functions
described in the chapter
"Operation".
Timer, temperature setting, fan
speeds.

Final tasks

■

Re-fit all the dismantled parts.

■

Familiarize the operator with
the system.

NOTE

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.

Unit dimensions

28

207

298

28

RXD 520RXD 260, RXD 350

580

298

100

100

250

190

1110

195

250

All values in mm

230

100

RXD 260 to 520

280

28

258

580

100

150

185

650

650

615

RXD 680, RXD 1200

1220

690

We reserve the right to modify the dimensions and constructional design as part of the ongoing technical development process.

580

810

615

245

REMKO RXD

24

Exploded view RXD 260 to 520

6

4

5

10

7

17

8

11

3

12

13

9

1

2

18

6

14

15 16

Spare parts list

the dimensions and constructional design as part of the ongoing

No. Designation RXD 260 RXD 350 RXD 520

1 Air inlet guard 1106650 1106650 1106650
2 Air filter 1106664 1106664 1106664
3 Cover 1106653 1106653 1106653
4 Fin motor 1106671 1106671 1106671
5 Air inlet, module 1106654 1106654 1106654
6 Outlet fins, set of 4 1106668 1106668 1106668
7 Condensation tray 1106652 1106652 1106652
8 Condensation hose 1106659 1106659 1106659

9 Vaporiser 1106699 1106694 1106686
10 Air circulation sensor 1106655 1106655 1106655
11 Vaporiser sensor 1106656 1106656 1106656
12 Fan wheel 1106666 1106666 1106666
13 Vaporiser fan motor 1106661 1106662 1106663
14 Control board 1106698 1106698 1106698
15 Transformer 1106677 1106677 1106677
16 Condenser, vaporiser fan 1106651 1106651 1106658
17 Condensation pump cpl. 1106667 1106667 1106667
18 IR remote control 1106660 1106660 1106660

Spare parts (not illustrated)

Condensation float switch 1106669 1106669 1106669
Defrost sensor Outdoor component 1106697 1106697 1106697
Display board 1106674 1106674 1106674

When ordering spare parts, please state the computerised part no., unit number and type (see identification plate)!

We reserve the right to modify

technical development process.

25

Exploded view RXD 680 / RXD 1200

5

10

7

1

2

6

4

3

14

16

9

11

17

12

8

13

18

15

We reserve the right to modify the dimensions and constructional

design as part of the ongoing technical development process.

Spare parts list

No. Designation RXD 680 RXD 1200

1 Air inlet guard 1106678 1106678
2 Air filter 1106665 1106665
3 Cover 1106681 1106681
4 Fin motor 1106671 1106671
5 Air inlet, module 1106675 1106675
6 Outlet fins, set of 6 1106679 1106679
7 Condensation tray 1106680 1106680
8 Condensation hose 1106659 1106659

9 Vaporiser 1106596 1106597
10 Air circulation sensor 1106655 1106655
11 Vaporiser sensor 1106656 1106656
12 Fan wheel 1106666 1106598
13 Vaporiser fan motor 1106662 1106599
14 Control board 1106693 1106693
15 Transformer 1106677 1106677
16 Condenser, vaporiser fan 1106658 1106631
17 Condensation pump cpl. 1106667 1106667
18 IR remote control 1106660 1106660

Spare parts (not illustrated)

Condensation float switch 1106669 1106669
Defrost sensor Outdoor component 1106697 1106697
Display board 1106682 1106682

We reserve the right to modify the dimensions and constructional design as part of the ongoing technical development process.

REMKO RXD

26

Technical data

Series

Operating mode

Nominal cooling output

Nominal heating output

1)

2)

Energy efficiency class, cooling

Energy efficiency ratio EER

1)

Energy efficiency class, heating

Coefficient of performance COP

kW 2,69 3,59 5,27 6,84 12,48

kW 2,96 4,24 6,31 7,72 13,23

1)

2)

2)

RXD 260 RXD 350 RXD 520 RXD 680 RXD 1200

Ceiling cassette for combined cooling/heating

A A B B C

3,24 3,21 3,08 3,03 2,81

A A C C D

3,65 3,62 3,25 3,22 3,01

Operating range (room volume), approx. m³ 80 110 160 230 400

Adjustment range, room temperature °C +16 to +30

Working range of indoor unit °C +15 to +35

Refrigerant R 410A

Operating pressure max. / per cooling circuit kPa 4200 / 4200

Air flow rate per stage m³/h 252/300/360 348/420/510 468/564/624 690/840/1020

Noise output per stage

3)

dB(A) 29/37/38 30/37/39 35/41/43 32/39/40 40/47/49

978/1188/1380

Voltage supply V/Hz 230 / 1~ / 50

Protection degree IP X0

Nom. electrical power consumption, cooling

Nom. electrical power consumption, heating

Electr. nominal power consumption cooling

Electr. nominal power consumption heating

Refrigerant connection, injection pipe

Refrigerant connection, suction pipe

1)

kW 0,04 0,04 0,05 0,07 0,09

2)

kW 0,04 0,04 0,05 0,07 0,09

1)

A 0,32 0,35 0,42 0,55 0,75

2)

A 0,32 0,35 0,42 0,55 0,75

Inches

(mm)

Inches

(mm)

1/4 (6,35) 1/4 (6,35) 1/4 (6,35) 3/8 (9,52) 3/8 (9,52)

3/8 (9,52) 1/2 (12,70) 1/2 (12,70) 5/8 (15,90) 3/4 (19,10)

Condensation connection mm 19

Condensation pump, delivery height mm 1000

Dimensions of unit Height mm 258 258 298 298 298

Width mm 580 580 580 1110 1110

Depth mm 580 580 580 580 580

Dimensions of cover Height mm 28 28 28 28 28

Width mm 650 650 650 1220 1220

Depth mm 650 650 650 690 690

Weight kg 26,0 26,0 27,0 59,0 59,0

Serial number 684... 687... 689... 698.... 699...

Computerised part no. 1619290 1619300 1619320 1619330 1619340

1) Air inlet temperature TK 27°C / FK 19°C, outdoor temperature TK 35 °C, FK 24 °C, max. air volume, 5m pipe length in combination with RXS 261H-1200H

2) Air inlet temperature TK 20°C outdoor temperature TK 7 °C, FK 6 °C, max. air volume, 5m pipe length in combination with RXS 261H-1200H

3) Distance 1 m free air

Notes

27

REMKO ACROSS EUROPE

… and in your area!
Profit from our experience and advice

Consultancy

Intensive training means

our consultants are always

up-to-date with the latest

developments. 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.

REMKO Our field staff are more

than just salesmen: above all,

they must advise our clients in

the areas of air conditioning and

heating technology.

REMKO GmbH & Co. KG.

Klima- und Wärmetechnik

Im Seelenkamp 12 · 32791 Lage

Postfach 1827 · 32777 Lage

Telephone [phone]

Fax [phone]

E-mail [e-mail]

Internet www.remko.de

Hotline

[phone]

Export

[phone]

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.

Subject to technical modifications, no responsibility taken for the correctness of information!