Remko RXT 685 DC User guide

Operating and
installation instructions

REMKO RXT series

Wall and ceiling chests for cooling and heating

RXT 525 DC, RXT 685 DC, RXT 1055 DC, RXT 1405 DC

0217-2021-07 Edition 2, en_GB

Read the instructions prior to performing any task!

R32

Refrigerant

Read these operating instructions carefully before commis­sioning / using this device!

These instructions are an integral part of the system and must
always be kept near or on the device.

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

Translation of the original

Table of contents

1 Safety and usage instructions............................................................................................................. 5

1.1 General safety notes....................................................................................................................... 5

1.2 Identification of notes...................................................................................................................... 5

1.3 Personnel qualifications.................................................................................................................. 5

1.4 Dangers of failure to observe the safety notes................................................................................ 5

1.5 Safety-conscious working............................................................................................................... 6

1.6 Safety instructions for the operator................................................................................................. 6

1.7 Safety notes for installation, maintenance and inspection ............................................................. 6

1.8 Unauthorised modification and changes......................................................................................... 7

1.9 Intended use................................................................................................................................... 7

1.10 Warranty........................................................................................................................................ 7

1.11 Transport and packaging............................................................................................................... 7

1.12 Environmental protection and recycling........................................................................................ 8

2 Technical data........................................................................................................................................ 9

2.1 Unit data.......................................................................................................................................... 9

2.2 Unit dimensions ............................................................................................................................ 12

3 Design and function............................................................................................................................ 13

3.1 Unit description............................................................................................................................. 13

4 Operation............................................................................................................................................. 14

4.1 General notes................................................................................................................................ 14

4.2 Display on indoor unit.................................................................................................................... 15

4.3 Keys on the remote control........................................................................................................... 16

5 Installation instructions for qualified personnel.............................................................................. 24

5.1 Important notes prior to installation............................................................................................... 24

5.2 Selection of installation location ................................................................................................... 24

5.3 Installation materials..................................................................................................................... 25

5.4 Wall openings................................................................................................................................ 26

5.5 Fastening options for the indoor unit............................................................................................. 27

5.6 Minimum clearances..................................................................................................................... 29

5.7 Connection variants...................................................................................................................... 29

5.8 Oil return measures....................................................................................................................... 29

6 Installation........................................................................................................................................... 30

6.1 Preparations for installation........................................................................................................... 30

6.2 Installation of the indoor unit......................................................................................................... 30

6.3 Connection of refrigerant piping.................................................................................................... 30

6.4 Additional notes on connecting the refrigerant piping................................................................... 32

6.5 Leak testing................................................................................................................................... 33

6.6 Adding refrigerant.......................................................................................................................... 33

7 Condensate drainage connection and safe drainage...................................................................... 34

8

Electrical wiring................................................................................................................................... 36

8.1 General notes................................................................................................................................ 36

8.2 Connecting the indoor unit............................................................................................................ 36

8.3 Outdoor unit connection................................................................................................................ 37

8.4 Electrical wiring diagram............................................................................................................... 37

8.5 Electrical drawings........................................................................................................................ 39

9 Before commissioning....................................................................................................................... 43

3

REMKO RXT series

10 Commissioning................................................................................................................................... 43

1

1 Shut-down............................................................................................................................................ 44

12 Troubleshooting, customer service and fault analysis................................................................... 45

12.1 Troubleshooting and customer service....................................................................................... 45

12.2 Indoor unit fault analysis............................................................................................................. 48

12.3 Resistances of the temperature probes...................................................................................... 59

13 Care and maintenance........................................................................................................................ 62

14 Exploded view and spare parts lists................................................................................................. 64

14.1 Exploded view - Indoor unit RXT 525-685 DC ........................................................................... 64

14.2 Spare parts list - Indoor unit RXT 525-685 DC........................................................................... 65

14.3 Exploded view - Indoor unit RXT 1055-1405 DC ....................................................................... 66

14.4 Spare parts list - Indoor unit RXT 1055-1405 DC....................................................................... 67

14.5 Exploded view - Outdoor unit RXT 525 DC ................................................................................ 68

14.6 Spare parts list - Outdoor unit RXT 525 DC................................................................................ 69

14.7 Exploded view - Outdoor unit RXT 685 DC ................................................................................ 70

14.8 Spare parts list - Outdoor unit RXT 685 DC................................................................................ 71

14.9 Exploded view - Outdoor unit RXT 1055 DC .............................................................................. 72

14.10 Spare parts list - Outdoor unit RXT 1055 DC............................................................................ 73

14.11 Exploded view - Outdoor unit RXT 1405 DC ............................................................................ 74

14.12 Spare parts list - Outdoor unit RXT 1405 DC............................................................................ 75

15 Index..................................................................................................................................................... 76

4

1 Safety and

usage instructions

1.1 General safety notes

Carefully read the operating manual before com­missioning the units or their components for the
first time. It provides useful tips and notes such as
hazard warnings to prevent injury and material
damage. Failure to follow
manual can endanger persons, the environment
and the equipment itself or its components and will
void any claims for liability.

Store this manual and the information required for
the operation of this system (e.g. refrigerant data­sheet) in the vicinity of the unit.

The refrigerant used in the system is flammable. If
applicable, observe the local safety conditions.

the directions in this

DANGER!

This combination of symbol and signal word
warns of a situation in which there is immediate
danger
cause serious injury.

This combination of symbol and signal word
warns of a potentially hazardous situation,
which if not avoided may be fatal or cause
serious injury

, which if not avoided may be fatal or

WARNING!

.

Warning of inflammable substances!

Identification of notes

1.2

This section provides an overview of all important
safety aspects for proper protection of people and
safe and fault-free operation.The instructions and
safety notes contained within this manual must be
observed in order to prevent accidents, personal
injury and material damage.

Notes attached directly to the units must be
observed in their entirety and be kept in a fully
legible condition.

Safety notes in this manual are indicated by sym­bols. Safety notes are introduced with signal words
which help to highlight the magnitude of the danger
in question.

CAUTION!

This combination of symbol and signal word
warns of a potentially hazardous situation,
which if not avoided may cause injury or mate­rial and environmental damage.

NOTICE!

This combination of symbol and signal word
warns of a potentially hazardous situation,
which if not avoided may cause material and
environmental damage.

This symbol highlights useful tips and recom­mendations as well as information for efficient
and fault-free operation.

1.3 Personnel qualifications

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.

Personnel responsible for commissioning, opera­tion, maintenance, inspection and installation must
be able to demonstrate that they hold a qualifica­tion which proves their ability to undertake the
work.

Dangers of failure to observe

1.4
the safety notes

Failure to observe the safety notes may pose a risk
to people, the environment and the units. Failure to
observe the safety notes may void any claims for
damages.

5

REMKO RXT series

In particular, failure to observe the safety notes
may pose the following risks:

n The failure of important unit functions.
n The failure of prescribed methods of mainte-

nance and repair

n Danger to people on account of electrical and

mechanical effects.

.

1.5 Safety-conscious working

The safety notes contained in this manual, the
existing national regulations concerning accident
prevention as well as any internal company
working, operating and safety regulations must be
observed.

Safety instructions

1.6
for the operator

The operational safety of the units and compo­nents is only assured providing they are used as
intended and in a fully assembled state.

n The units and components may only be set up,

installed and maintained by qualified per­sonnel.

n Protective covers (grills) over moving parts

must not be removed from units that are in
operation.

n Do not operate units or components with

obvious defects or signs of damage.

n Contact with equipment parts or components

can lead to burns or injury

n The units and components must not be

exposed to any mechanical load, extreme
levels of humidity or extreme temperatures.

n Rooms in which refrigerant may escape shall

be adequately aerated and ventilated. Other­wise, a risk of suffocation or fire exists.

n Do not leave children unsupervised when close

to the system.

n Commissioning must be performed by author-

ised specialists exclusively. Deficient commis­sioning may lead to water leaks, electric
shocks or fire. Commissioning must take place
as described in the user manual.

n Only instruct authorised specialist personnel to

perform maintenance or servicing.

n The system is filled with a flammable refrig-

erant. Never thaw any frozen unit components
independently!

n Do not operate any further devices that pro-

duce high heat or naked flames in the same
room.

.

n All housing parts and unit openings, e.g. air

inlets and outlets, must be kept clear

n The units must be inspected by a service tech-

nician to ensure that they are safe to use and
fully functional at least once yearly. Visual
inspections 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

n The refrigerant R32 used in the system is flam-

mable. If applicable, observe the local safety
conditions.

n Keep the cooling circuit clear of other gases

and foreign substances. Only fill the cooling cir­cuit with the refrigerant R32.

n Only use the accessories, components and

appropriately marked parts provided. The use
of non-standardised components may result in
water leaks, electric shocks and fire.

n Only install and store the units in rooms larger

than 4 m2. With a failure to comply
result in the room filling with a flammable mix­ture!

The minimum room size of 4 m2 required for
installation and storage pertains to the basic fill
quantity of the unit. This varies according to the
installation type and total fill quantity of the
system. The calculation must take place in
accordance with valid DIN standards. Make
sure that the installation site is suitable for safe
unit operation.

n Only mount the unit components on structurally

suitable brickwork.

n The units must not be installed in rooms in

which further devices that produce heat are
operated (heaters, open hearths).

n Make sure the installation room is sufficiently

ventilated.

n Interventions in the cooling circuit are only pos-

sible after completely draining the refrigerant.
Never solder or grind unit components!

n Note that refrigerant may be odourless.
n Never operate the air conditioning unit in a

humid room, such as a bathroom or laundry
room. If the humidity is too high, this can cause
short circuits on electrical parts.

n The product must be correctly earthed at all

times, otherwise it may induce electric shocks.

n Attach the condensate drain as described in

the operating manual. The inadequate
drainage of condensate can lead to water
damage in your apartment.

n All persons who intervene in the cooling circuit

must hold a valid certificate from the chamber
of industry and commerce, which confirms their
ability to work with refrigerant.

, leaks may

6

n Appropriate hazard prevention measures must

be taken to prevent risks to people when per­forming installation, repair
cleaning work on the units.

n The setup, connection and operation of the

units and its components must be undertaken
in accordance with the usage and operating
conditions stipulated in this manual and comply
with all applicable regional regulations.

n Regional regulations and laws as well as the

Water Ecology Act must be observed.

n The power supply should be adapted to the

requirements of the units.

n Units may only be mounted at the points pro-

vided for this purpose at the factory. The units
may only be secured or mounted on stable
structures, walls or floors.

n The units and components should not be oper-

ated in areas where there is a heightened risk
of damage. Observe the minimum clearances.

n The units and components must be kept at an

adequate distance from flammable, explosive,
combustible, abrasive and dirty areas or
atmospheres.

n Safety devices may not be modified or

bypassed.

n The connection of the indoor unit must be

established as a permanent connection; a
detachable, reusable connection is not permis­sible.

, maintenance or

1.8 Unauthorised modification and changes

1.10 Warranty

For warranty claims to be considered, it is essential
that the ordering party or its representative com­plete and return the "certificate of warranty" to
REMKO GmbH & Co. KG at the time when the
units are purchased and commissioned.

The warranty conditions are detailed in the "Gen­eral business and delivery conditions". Further­more, only the parties to a contract can conclude
special agreements beyond these conditions. In
this case, contact your contractual partner in the
first instance.

1.1

1 Transport and packaging

The devices are supplied in a sturdy shipping con­tainer. Please check the equipment immediately
upon delivery and note any damage or missing
parts on the delivery and inform the shipper and
your contractual partner. For later complaints can
not be guaranteed.

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!

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
use of other parts may invalidate liability for
resulting consequences.

. The

1.9 Intended use

Depending on the model, the units and the addi­tional fittings with which they are equipped are only
intended to be used as an air-conditioner for the
purpose of cooling or heating the air in an
enclosed space.

Any different or additional use is a non-intended
use. The manufacturer/supplier assumes no lia­bility for damages arising from a non-intended use.
The user bears the sole risk in such cases.
Intended use also includes working in accordance
with the operating and installation instructions and
complying with the maintenance requirements.

The threshold values specified in the technical
data must not be exceeded.

7

REMKO RXT series

1.12 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 equipment and components

Only recyclable materials are used in the manufac­ture of the devices and components. Help protect
the environment by ensuring that the devices or
components (for example batteries) are not dis­posed in household waste, but only in accordance
with local regulations and in an environmentally
safe manner, e.g. using certified firms and recy­cling specialists or at collection points.

8

2 Technical data

2.1 Unit data

Series RXT 525 DC RXT 685 DC RXT 1055 DC RXT 1405 DC

Operating mode

Nominal cooling output

1)

Energy efficiency ratio SEER

Power consumption,
annual, QCE

3)

Energy efficiency ratio, cooling

Nominal heat capacity

2)

Energy efficiency ratio SCOP

Power consumption,
annual, QHE

3)

Energy efficiency ratio, heating

Rated power consumption,
electrical cooling

1)

kW

1)

kWh 305 413 574 ---

1)

kW

4)

kWh 1400 1925 2937 ---

2)

kW

Rated elec. curr. consump.,
cooling

1)

Inverter wall/ceiling-mounted room air conditioner combination

for cooling and heating

5,30

(2,70-5,90)

7,00

(2,70-7,70)

10,60

(2,70-1

1,80)

14,10

(3,50-15,20)

6,2 6,1 6,4 ---

A++ A++ A++ ---

5,60

(2,40-6,30)

7,60

(2,70-8,30)

11,70

(2,80-12,80)

16,10

(4,10-17,0)

4,0 4,0 4,0 ---

A+ A+ A+ ---

1.63 2.19 3.75 5.50

A 7.20 10.00 5.80 9.10

Rated power consumption,
electrical heating

2)

Rated elec. curr. consump.,
heating

2)

kW 1.50 2.05 3.00 5.05

A 6.60 9.50 4.80 8.14

Max. power consumption kW 2.95 2.95 5.60 6.20

Max. current consumption A 13.50 13.50 10.00 11.20

EDP no. 1619550 1619560 1619570 1619580

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)

The specified value is based on results from standard testing.

The actual consumption depends on the use and location of the unit

4)

The specified value is based on the average heating period

9

REMKO RXT series

Data specific to indoor unit

Power supply V/Ph/Hz 230/1~/50

Application area (room vol.)
approx.

Adjustment range
room temperature

Operating range

Air flow volume per stage

Sound pressure level
per stage

Sound power (turbo mode) dB(A) 59 65 65 65

Enclosure class IP X0

Condensate drainage
connection

Dimensions: H/W/D mm 675/1068/235 675/1650/235

5)

m

°C +17 to +30

°C/

RH %

m3/h

dB (A) 24/37/41/44 32/43/46/49 39/45/48/51 36/45/50/53

mm 25

RXT 525 DCITRXT 685 DCITRXT 1055 DCITRXT 1405 DC

3

160 230 320 470

+17 to +30 / 35 to 65

723/839/

958

853/1023/

1

192

1504/1728/

1955

IT

1600/1850/

2100

Weight kg 28.0 26.8 39.0 41.2

EDP no. 1619552 1619562 1619572 1619582

5)

At distance of 1 m in the open air; specified values are maximum values

10

RXT 525 DC

RXT 685 DCATRXT 1055 DCATRXT 1405 DC

Data specific to outdoor unit

A

T

AT

Power supply V/Ph/Hz 230/1~/50 400/3~/50

Operating range, cooling °C

Operating range, heating °C

Air flow rate, max.

m3/h

+5 to +50

+5 to +24

2000 2700 4000 7500

7)

7)

Enclosure class IP 24

Sound pressure level

5)

dB (A) 55 62 64 66

Sound power level max. dB (A) 63 64 68 72

Refrigerant

6)

R32

Refrigerant, basic quantity kg 1.15 1.50 2.40 2.90

CO2 equivalent t 0.78 1.01 1.62 1.89

Operating pressure, max. kPa 4200/1500

Refrigerant, additional
quantity >5 m

g/m 30 30 30 30

Refrigerant piping, max. length m 30 50 65 65

Refrigerant piping, max. height m 20 25 30 30

Refrigerant connection

Liquid line

Refrigerant connection

Suction pipe

Inches

(mm)

Inches

(mm)

1/4 (6.35) 3/8 (9.52) 3/8 (9.52) 3/8 (9.52)

1/2 (12.70) 5/8 (15.90) 5/8 (15.90) 5/8 (15.90)

Dimensions: H/W/D mm 554/800/333 673/962/380 810/946/410 1333/952/410

Weight kg 33,5 43,9 80,5 103,7

EDP no. 1619551 1619561 1619571 1619581

5)

At distance of 1 m in the open air; specified values are maximum values

6)

Contains greenhouse gas per the Kyoto protocol, GWP 675 (for further information,

see chapter "Adding refrigerant")

7)

This can be extended to -15 °C with the appropriate accessory kit

11

D

E

B

A

C

B

C

A

REMKO RXT series

2.2 Unit dimensions

Outdoor units

Fig. 1: Dimensions RXT 525-1405 DC AT (all measurements in mm)

Measurements (mm) A B C D E

RXT 525 DC AT 874 511 317 554 346

RXT 685 DC AT 962 663 348 673 380

RXT 1055 DC AT 946 810 410 673 403

RXT 1405 DC AT 952 1333 410 634 404

Indoor units

Fig. 2: Unit dimensions, indoor unit RXT 525-1405 DC IT

Measurements (mm) A B C

RXT 525 DC IT 675 1068 235

RXT 685 DC IT 675 1068 235

RXT 1055 DC IT 675 1650 235

RXT 1405 DC IT 675 1650 235

12

B

A

4

3

5

6

1

2

3

7

8

9

1

EEV

RXT 1051 DC

M

M

PS H

T1

T2

T

3

TE

T5

P

S

L

T4

T3

T2

M3

M2

M1

PSL

PSH

T1

V1

M

M

TE

PS H

T1

T2

T

3

T5

P

S

L

M1

M3

T4

T3

T2

M2

PSL

PSH

T1

V1

EEV

2

A B

A B

FLT

FLT

FLT

FLT

OEL

T5

T5

3 Design and function

3.1 Unit description

The RXT room air conditioners have a REMKO
RXT...DC AT outdoor unit as well as a RXT...DC IT
indoor unit.

In cooling mode, the outdoor unit serves to output
the heat extracted by the indoor unit from the room
being cooled. In heating mode, the heat taken up
by the outdoor unit can be discharged by the
indoor unit into the room to be heated. In both
operating modes, the output produced by the com­pressor precisely matches requirements, and
thereby regulates the nominal temperature with
minimal temperature deviations. This "inverter
technology" results in energy savings over conven­tional split systems and also reduces noise emis­sions to a particularly low level. The outdoor unit
can be installed in an outdoor area or, providing
that certain requirements are met, an indoor area.
The outdoor unit consists of a cooling cycle with
compressor, fin condenser, condenser fan,
reversing valve and electronic expansion valve.
The outdoor unit is controlled by the regulation of
the indoor unit.

The indoor unit is designed both for both wall and
ceiling-mounted operation in indoor areas. It is
operated by an infrared remote control. The indoor
unit consists of a fin evaporator, evaporator fan,
controller and condensate tray.

Floor consoles, wall consoles, refrigerant piping,
wired remote controls and condensate pumps are
available as accessories.

Refrigerant piping is used to connect the indoor
unit to the outdoor unit.

Fig. 4: Cooling cycle schematic

A: Outdoor area
B: Indoor area
1: RXT 525-685 DC
2: RXT 1055-1405 DC
M1: Condenser fan
M2: Compressor
M3: Evaporator fan IT
V1: Changeover valve C/H
EEV: Electr. expansion valve
FLT: Filter
OEL: Oil return line
PSH: High pressure switch AT
PSL: Low pressure switch AT
T1: Probe, evaporator IT
T2: Probe, air inlet IT
T3: Probe, condenser AT
T4: Probe, air inlet AT
T5: Probe, heat gas AT

Fig. 3: System layout RXT 525-1405 DC

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 pipes / 8: Injection pipes
9: Control lines

13

max. 6 m

REMKO RXT series

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 man­ually operated.

Manual mode

The indoor unit can also be started manually. By
pressing the "Manual" key (on the display board)
multiple times, the unit can be activated with the
following functions:

The following settings apply for manual operation:

Pressing once: Automatic mode 24°C, fan speed
automatic

Pressing twice: Cooling mode, fan speed high

Pressing three times: Unit OFF

Fig. 5: Maximum distance

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.

wo AAA batteries must be inserted into the

T
remote control in preparation. To do so, remove
the flap from the battery compartment and insert
the batteries the correct way around (see mark­ings).

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.

14

MANUAL TIMER

ALARM

OPERATION

DEF./FAN

1 2 3

5 6

4

7

Wired remote control

Connection of the optional wired remote control

1. The plug for connection of a wired remote
control is located behind the panel at the dis­play board (

Fig. 6). The 5-core cable, coming
from the display panel, is marked with the
designations "A-E" (Fig. 7).

Fig. 6: Indoor unit panel

Fig. 7: Display circuit board

4.2 Display on indoor unit

Display on indoor unit

The LED indicators illuminate to indicate the set­tings:

Fig. 8: Display for setpoint/errors

1: Digital display
2: Manual operation
3: Operation display
4: Timer indicator
5: Unit for receiving signals from the remote con-

trol
6: Defrosting fan
7: Alarm indicator

Alarms are indicated by a code (see chapter

roubleshooting and customer service).

T

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
excluded from our recommendation!

. Components with a safety function is

15

10

8

11
12

2

1

6

3

7

5

9

4

13

14

1

2

3

4

5

6

7

8

9

10

11

12

REMKO RXT series

4.3 Keys on the remote control

“Swing” key

Starts and stops the horizontal fin movement.
Press and hold the key for 2 seconds to start the
vertical fin movement (available depending on the
unit model).

“Fan speed” key

Allows switching between the dif

ferent fan speeds

in the following order:

Automatic  Low  Medium  High

Note: To activate the silence function (available
depending on the appliance model) of the appli­ance, press and hold the key for 2 seconds.

urbo” key

“T

Activating the turbo function ensures that the set­point is reached as quickly as possible.

“Mode” key

This key allows switching between the dif

ferent

operating modes in the following order:

Fig. 9: Keys on the remote control

“On/Off” key

Press this key to switch the air conditioning unit on

f.

and of

“Arrow up” temperature key

Increases the setpoint in 1 °C steps up to a tem­perature of max. 30 °C.

“SET” key

Makes it possible to switch between dif
ating functions as follows:

“Follow me” function (

- Network configuration ( )

- “Follow me” function ( )

The selected function flashes in the display
firm with the “OK” key.

)

ferent oper-

, con-

Automatic  Cooling  Dehumidifying  Heating
 Recirculation

“Sleep” key

Activates/deactivates the energy saving function of
the unit (e.g. overnight).

“OK” key

Required to confirm various functions of the IR
remote control.

imer” key

“T

Activates/deactivates the time-delayed start of the
unit or the unit switch-off.

“Arrow down” temperature key

Decreases the setpoint in 1 °C steps down to a
temperature of min. 17 °C.

“Fresh” key

Activates/deactivates the REMKO BioClean func­tion (ionisation).

16

13

14

1 3

2

5

6

7

4

8

9

10

11

12

13

14

1

2

3

4

5

6

7

8

9

10

11

12

13

14

“Clean” key

Activates/deactivates the self-cleaning function of
the unit (available depending on the unit model).

“LED” key

Enables switching on/of

f the unit lighting and the

signal tones (depending on the unit).

Indicators on the LCD

Time-delayed switch-on active.

Time-delayed switch-off active.

Silent mode active.

Fan speed

Displays the set fan speed as follows:

Low:

Medium:

High:

Automatic:

Mode selection

Shows the current operating mode.

Eco function

Lights up when the Eco function is active (available
depending on the unit).

Key lock

Symbol appears when the key lock is activated.

emperature/Timer/Fan speed

T

Fig. 10: Indicators on the LCD

Shows the current temperature setpoint in the
basic view. When using the additional function
“Timer”, the corresponding time values are shown.

BioClean function active (available depending

on the unit type).

Sleep function active.

Follow-me function active.

Network configuration active.

Battery low (flashing).

Signal transmission

Lights up when a signal is sent from the IR remote
control to the air conditioning unit.

17

REMKO RXT series

Temperature setting

The temperature setting can be made within a
range of 17-30 °C. The setpoint is adjusted in 1 °C
steps.

Automatic mode

In automatic mode, the unit automatically selects
the operating mode based on the set temperature
setpoint.

1. Press the “Mode” key to activate the “Auto”
function.

2. Set the desired temperature using the “Λ ”
and “V” keys.

3. The unit can be switched on by pressing the
“ON/OFF” key.

Cooling mode

1. Press the “Mode” key and activate the “Cool”

function.

2. Set the desired temperature using the “Λ ”

and “V” keys.

3. Press the “FAN” key to select the fan speed.
The following are available: Automatic, Low,
Medium and High

4. The unit can be switched on by pressing the
“ON/OFF” key.

The fan speed cannot be set in automatic
mode!

Fig. 11: Cooling mode

18

2

1

3

2

1

3

Timer function

With the “Timer” function, the unit can switch on
with a switch-on delay or switch of
off delay.

Time-delayed switch-on

1. Press the “T

setting

2. Use the arrow keys to select the desired
number of hours after which the air condi­tioning unit is to switch on

3. Point the remote control towards the air con­ditioning unit and wait 1 sec. The timer is
now active (symbol in the display of the
remote control)

imer” key to enter the “Time ON”

f with a switch-

Time-delayed switch-off

1. Press the “T

OFF” setting

2. Use the arrow keys to select the desired
number of hours after which the air condi­tioning unit is to switch of

3. Point the remote control towards the air con­ditioning unit and wait 1 sec. The timer is
now active (symbol in the display of the
remote control)

imer” key to enter the “Time

f

Fig. 13: Time-delayed switch-off

Fig. 12: Time-delayed switch-on

19

13.00

14.00 15.00 15.30 16.00 17.00 18.00

a

b
c

2

1

3

1

2

REMKO RXT series

Combining time-delayed switching on and off

Fig. 14: Combining time-delayed switching on and off

1: Timer starts
2: Unit switches on
3: Unit switches off

Example: If both timers are activated at 13:00, the unit switches on 2.5 hours later (at 15:30) and switches off
5 hours later (at 18:00).

“Swing” function

Press the “Swing” key

1. The horizontal air guide fin starts to rise and fall automatically
desired position

2. On units with 3D swing function, pressing the “Swing” key for 2 seconds activates the vertical fin move­ment

a: current (13:00)
b: 2.5 hours later
c: 5 hours later

. Pressing again stops the fin at the

Fig. 15: “Swing” function

20

2

1

Deactivate lighting and signal tones

1. Press the “LED” key to switch the unit lighting

on and of

2. Press and hold the “LED” key for longer than
5 seconds, the ACTUAL temperature
appears in the unit display (not available for
all unit types)

Fig. 16: Deactivate lighting and signal tones

Activating Silent function

Depending on the unit type, the Silent function
(low-noise unit operation) can be activated. T
this, the “FAN” key must be pressed and held for 2
seconds. The unit now operates in a particularly
quiet mode. It must be taken into account that the
unit cannot call up the full cooling or heating
capacity.

The silent mode can be deactivated again by
pressing the “ON/OFF”, “Mode”, “Sleep”, “Turbo” or
“Clean”.

f.

o do

Frost protection function

The air conditioning unit operates at high fan
speed with a fixed setpoint of 8 °C (only available
in heating mode).

o activate this function, heating mode must be

T
activated and the setpoint must be set to 17°C.

Pressing the “Arrow down” key twice within one
second activates the FP function.

The function can be deactivated again by pressing
the “On/Off”, “Sleep”, “Mode”, “Fan” keys and the
temperature setting.

Fig. 19: Frost protection function

Activating key lock

Hold the “Clean” and “T
for 5 seconds to activate the key lock.

To deactivate the key lock, both keys must be
pressed again for 2 seconds.

Fig. 20: Activating key lock

urbo” keys simultaneously

“Shortcut” key

Pressing this key (not available on all unit models)
while the unit is in operation will reset all settings
(including operating mode, setpoint, fan speed and

Fig. 17: Silent function

Eco function

Press the “Eco” key (not available on all models) to
activate the energy-saving function of the unit.

Note: Function only available in cooling mode!

Fig. 18: COS Eco function

Function description:

Pressing this key in cooling mode automatically
sets the temperature setpoint to 24 °C. When the
room temperature is <24 °C, the fan goes into
energy-saving mode. If the room temperature is
>24 °C, the fan speed remains in the “Automatic”
operating mode.

sleep function) to the last used settings.

Fig. 21: “Shortcut” key

21

REMKO RXT series

Self-cleaning function

Press the “Clean” key (not available on all unit
models).

Due to the formation of condensate on the heat
exchanger and the residual moisture that remains,
bacteria can multiply quickly
operation, the heat exchanger is dried by the air
volume flow. This drying process can also be
started manually with the “Clean” function (for
example, if the unit is not in regular use). In cooling
or dehumidification mode, the self-cleaning func­tion can be activated. The unit switches off auto­matically after cleaning.

. In regular normal

“Turbo” function

If the “T
unit operates with the highest possible cooling
capacity and at the same time with the highest fan
speed.

This allows the desired setpoint to be reached as
quickly as possible.

Fig. 23: “Turbo” function

urbo” key is pressed in cooling mode, the

Fig. 22: Self-cleaning function

22

“Set” key

Press the “Set” key to enter the settings menu. Press the “Set” key or the arrow keys again to select the
desired function. The corresponding function flashes on the display of the remote control. Press the “OK” key
to select it.

Fig. 24: “Set” key

The additional functions are shown in the following order:

BioClean function ( )  Sleep function ( )  Follow-Me function ( )  Network configuration ( )

If your remote control has the “Fresh” and “Sleep keys, these functions cannot be operated via the “SET”

.

key

“BioClean” function ( )

When the BioClean function is activated, negatively charged ions are released into the air stream to increase
the air quality

Sleep function

The sleep function can be used to save energy during night operation. This function is not available in the
“Recirculation” and “Humidification” operating modes. The “Sleep” key should be pressed before going to
bed. In cooling mode, the unit will increase the setpoint by 1 °C after 1 operating hour
ating hour, the temperature is increased by 1 °C again. In heating mode, the setpoint is lowered by the previ­ously mentioned parameters.

The sleep function deactivates automatically after an operating time of 8 hours.

AP mode (network configuration)

Not available for all unit types and can only be used in combination with the optional REMKO WifiStick. AP
mode can be activated by pressing the “LED” key several times within 10 seconds. The unit is now in net­work configuration mode. For integration via WLAN, please observe the assembly and operating instructions
of the REMKO Wifi-Stick.

.

. After another oper-

23

REMKO RXT series

5 Installation instructions for qualified personnel

5.1 Important notes prior to installation

ransport the unit in its original packaging as

n T

close as possible to the installation location.
You avoid transport damage by doing so.

n Check the contents of the packaging for com-

pleteness and check the unit for visible trans­port damage. Report any damage immediately
to your contractual partner and the shipping
company.

n Lift the unit on the corners and not on the

refrigerant or condensate drainage connec­tions.

n The refrigerant piping (injection and suction

pipe), valves and connections must be insu­lated against vapour density. If necessary also
insulate the condensate drainage line.

n Select an installation location which allows air

to freely flow through the air inlet and outlet
(see section "Minimum clearances").

n Do 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.

n Only open the shut-off valves on the refrigerant

piping after installation is complete.

n Seal off open refrigerant piping with suitable

caps or adhesive strips to prevent the infiltra­tion of moisture and never kink or compress
the refrigerant piping.

n Avoid unnecessary bends. This minimises the

pressure loss in the refrigerant piping and
ensures that the compressor oil can flow back
without obstruction.

n Make special preparations regarding the oil

return if the outdoor unit is located above the
indoor unit (see section "Oil return measures").

n Add refrigerant if the basic length of the refrig-

erant piping exceeds 5 metres. For the quantity
of additional refrigerant, refer to chapter
"Adding refrigerant".

n Perform all electrical wiring in accordance with

applicable DIN and VDE standards.

n Ensure the electrical cables are properly con-

nected to the terminals. Otherwise there is a
risk of fire.

n Use suitable fastening materials for the instal-

lation location of the units.

5.2 Selection of installation location

Indoor unit

The indoor unit is designed for horizontal wall
installation underneath windows. However
also be used in the upper wall area (max. 1.25 m
above the floor). The unit is also designed for hori­zontal ceiling installation. Observe the condensate
drainage in particular here.

Fig. 25: Horizontal positioning

Outdoor unit

The outdoor unit is designed for horizontal installa­tion on a base in outdoor areas. The installation
site must be level, flat and firm. The unit should
also be secured to prevent it from tipping over
outdoor unit can be set up outside as well as inside
a building. For external installation, please observe
the following notes to protect the unit from the
influence of the weather.

Rain

For floor or roof set-up, the unit should be installed
with at least 10cm ground clearance. A floor
bracket is available as an optional accessory.

Sun

The condenser on the outdoor unit emits heat.
Exposure to sunlight further increases the temper­ature of the fins and reduces the heat released by
the finned heat exchanger. The outdoor unit should
be installed on to the north side of the building
whenever possible. If necessary, take measures to
provide sufficient shade (responsibility of cus­tomer). One possible solution is to build a small
roofed area over the unit. These measures should
not affect the flow of warm outlet air.

, it can

. The

24

Wind

1

20 cm

1

2

1

K

3

W

3

If the unit is being installed in windy areas, ensure
that the warm outlet air is discharged in the pre­vailing wind direction. If this is not the possible, it
may be necessary to install a windbreak (to be pro­vided by the customer). Ensure that the windbreak
does not adversely af

Fig. 26: Windbreak

1: Wind

Snow

The unit should be wall-mounted in areas of heavy
snowfall. Installation should be at least 20cm
above the expected level of snow to prevent snow
from entering the outdoor unit. An optional wall
bracket is available as an accessory

fect the air intake to the unit.

.

Fig. 27: Minimum clearance to snow

1: Snow

Installation inside buildings

n Ensure that heat can dissipate adequately

when placing the outdoor unit in cellars, lofts,
adjoining rooms or halls (

n Install an additional fan with a rated flow com-

parative to that of the outdoor unit being
installed in the room and which can compen­sate any additional pressure loss in ventilation
ducts (Fig. 28).

n Comply with any regulations and conditions

fecting the statics of the building. If neces-

af
sary, fit acoustic installation.

Fig. 28).

Fig. 28: Installation inside buildings

K: Cold fresh air
W: Warm air
1: Outdoor unit

5.3 Installation materials

The indoor unit is attached to the wall by a wall
bracket and 4 screws (to be provided by the cus­tomer).

2: Additional fan
3: Air shaft

The outdoor unit is attached by 4 screws and a
wall bracket to the wall or fixed by a floor bracket to
the ground.

25

21 5

3 4

REMKO RXT series

5.4 Wall openings

n A wall opening of at least 70 mm diameter and

10 mm incline from the inside to the outside
must be created.

o prevent damage to the lines, the interior of

n T

the wall opening should be padded or, for
example, lined with PVC pipe (see figure).

n After installation has been completed, use a

suitable sealing compound to close off the wall
opening, taking account of fire protection regu­lations (provided by the customer). Do not use
cement or lime containing substances!

Fig. 29: Wall opening

1: Injection pipe
2: Control line
3: Condensate drainage line
4: Suction pipe
5: PVC pipe

26

5.5 Fastening options for the indoor unit

1

2

3

3

4

5

20 ~ 25 mm

1

1

1

1

If wall-mounted, the indoor units are mounted with fastening hooks and hanger bolts, and if ceiling-mounted
then with fastening hooks and threaded rods.

Fig. 30: Unit fastening with threaded rod

1: Unit mount
2: Threaded rod M10
3: Nut M10

4: Washer
5: Vibration damper (optional)

Fig. 31: Unit fastening

1: Unit mount

27

1

1

2

2

1

1

3

3

4

REMKO RXT series

Fig. 32: Unit fastening without housing

1: Unit mount
2: Hanger bolts or threaded rods

3: Side part
4: Air inlet grill

28

2

1

A

B

C

D

E

>1000mm

> 35mm

>35mm

> 35mm

A

1

2

3

1

A

B

2

5.6 Minimum clearances

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

Minimum clearances, outdoor units
RXT 525-1405 DC A

Fig. 33: Minimum clearances, outdoor units

1: Air inlet / 2: Air outlet

Measure-

ments

(mm)

A 300

T

RXT 525-1405 DC AT

5.7 Connection variants

The following connection variants can be used for
the refrigerant, condensate and control lines.

Fig. 35: Connection variants

A: Refrigerant piping
1: Outlet on the wall, right
2: Outlet through the wall, right
3: Outlet on the wall, down

B 2000

C 600

D 200

E 400

Minimum clearances, indoor units
RXT 525-1405 DC IT

Fig. 34: Minimum clearances, indoor units (all
measurements in mm)

A: Wall installation / B: Ceiling installation

29

5.8 Oil return measures

If the outdoor unit is installed at a higher level than
the indoor unit, suitable oil return measures must
be taken. Usually
every 7 metres of height difference.

Fig. 36: Oil return measures

A: Outdoor unit
B: Indoor unit
1: 1 x oil pump bend in suction pipe to outdoor

unit every 7 metres of height dif
50 mm

2: Max. 10 m

, an oil pump bend is installed for

ference, radius:

REMKO RXT series

6 Installation

6.1 Preparations for installation

Removing the air inlet grill

NOTICE!

Installation should only be performed by author­ised specialists.

1. Fold the air inlet grill forwards.

2. Remove the middle retainer by releasing the

two bars from the fastening.

3. Undo the lateral fastening screws and
remove the grill.

4. After installation, all parts that were removed
must be fitted again.

6.2

Installation of the indoor unit

Wall installation

The unit is attached by means of a wall bracket,
taking account of the air outlet side located
towards the top of the unit.

1. Mark the mounting points on the structurally
permissible building sections according to the
dimensions of the wall bracket.

2. If necessary
of the housing.

3. Hook the unit on to the previously attached
bracket.

4. Connect the refrigerant piping, electrical
cables and condensate drainage line to the
indoor unit as described below

5. Hang the indoor unit onto the wall bracket by
tilting it back slightly and by pressing the
bottom part of the unit against the bracket.

6. Check again that the unit is level.

, remove the break out opening

.

Ceiling installation

The unit is attached by means of the integrated
ceiling bracket, taking account of the air outlet side
located on the front of the unit.

1. Mark the mounting points on the structurally
permissible building sections according to the
dimensions of the wall bracket.

2. If necessary
of the housing.

3. Hook the unit onto the four previously
installed screws/threaded rods.

4. Fit the unit such that it is attached 5 mm
lower in the connection area (air inlet) than
on the air outlet side!

5. Connect the refrigerant piping, electrical
cables and condensate drainage line to the
indoor unit as described below

, remove the break out opening

.

6.3 Connection of

refrigerant piping

The refrigerant piping is connected on the back
side of the units.

It may be necessary to fit a reducer or flared
adapter to the indoor unit. These fittings are
included with the indoor unit as an accessory kit.
Once installed, the connections should be insu­lated to make them vapour diffusion proof.

NOTICE!

Installation should only be performed by author­ised specialists.

NOTICE!

The unit is factory filled with dry nitrogen for
leak testing purposes. The pressurised nitrogen
is released when the union nuts are undone.

The wall bracket for the units must be attached
with suitable screws and anchors.

NOTICE!

Use only tools which are approved for use in an
HVAC environment. (z. B.: bending pliers, pipe/
tubing cutters, de-burrers and flaring tools). Do
not cut refrigerant pipes with a saw.

NOTICE!

All work must be carried out in a way that pre­vents dirt, particles, water etc. from entering,
refrigerant lines!

30

The following instructions describe the installation

2

1

of the cooling cycle and the assembly of the indoor
unit and the outdoor unit.

1. The required pipe diameters are given in the
table "T

2. Install the indoor unit and connect the refrig­erant piping as described in the operating
manual for the indoor unit.

3. Use the wall or floor brackets to fit the out­door unit against structural parts approved to
support the static load (refer to the installa­tion instructions for the brackets).

4. Ensure that structure-borne sound is not
transferred to parts of the building. Use vibra­tion dampers to reduce the ef
ture-borne sound!

5. Lay the refrigerant piping from the indoor unit
to the outdoor unit. Ensure that the fasten­ings are adequate and if necessary
appropriate oil return measures!

6. Remove the factory-fitted protective caps and
union nuts on the connections. These should
be used later in the installation process.

7. Before flanging the refrigerant piping, ensure
that the union nut is fitted on the pipe.

8. Prepare the laid refrigerant piping as shown
below (

9. V
(Fig. 39).

10. First connect and hand-tighten the refrigerant
piping to ensure it is correctly seated.

11. Then tighten the fittings with 2 appropriately­sized open-ended spanners. Use one
spanner to counter the force when tightening
the fitting (Fig. 40).

12. Use insulation hoses which are designed for
this temperature range and are dif
proof.

13. Observe the permitted bending radius for the
refrigerant piping during installation. Never
bend a pipe twice in the same place. Brittle­ness and cracking can result.

14. Apply appropriate heat insulation to the
installed refrigerant piping, including con­nector

15. T
for all subsequent refrigerant piping.

echnical data".

fects of struc-

, take

Fig. 37 and Fig. 38).

erify that the shape of the flange is correct

fusion

.

ake the same action at the shut-off valves

Label the refrigerant piping (injection and suc­tion pipes) as well as the associated electrical
control lines of each interior unit with a letter
Only connect the lines to their associated con­nections.

NOTICE!

Always pay attention to the af
electrical lines and refrigerant piping! The con­nections of the individual circuits must not be
mixed up. Mixing up the assignment of control
lines and refrigerant piping can have fatal con­sequences (compressor damage)!

Commissioning of the individual circuits must
be carried out successively.

Fig. 37: Deburring the refrigerant piping

1: Refrigerant piping
2: Deburrer

filiation of the

.

31

1

2

1

REMKO RXT series

Fig. 38: Flanging the refrigerant piping

1: Flanging tool

Fig. 39: Correct flange shape

Fig. 40: Tightening the fitting

1: Tighten with the first open-ended spanner
2: Counter with the second open-ended spanner

Pipe dimension in
inches

1/4" 15-20

3/8" 33-40

1/2" 50-60

5/8" 65-75

3/4" 95-105

Tightening torque in Nm

6.4 Additional notes on connecting the refrigerant piping

n When combining the outdoor unit with some

indoor units, the procedure for connecting the
refrigerant piping may dif
vided reducer or expansion fittings to the
indoor unit.

n If the basic length of the connecting line

exceeds 5m, add refrigerant when commis­sioning the system for the first time (see
chapter "Adding refrigerant").

fer. Install the pro-

NOTICE!

A flare connection may only be established out­side the room. Detachable, reusable connec­tions are not permissible inside!

32

6.5 Leak testing

Once all the connections have been made, the
pressure gauge station is attached to the Schrader
valve as follows (if fitted):

red = small valve = high pressure

blue = large valve = suction pressure

Once the connection has been made successfully
the leak test is carried out with dry nitrogen.

Leak testing involves spraying a leak detection
spray onto the connections. If bubbles are visible,
the connections have not been made properly. In
that case, tighten the connection or, if necessary,
create a new flange.

After completing a successful leak test, the excess
pressure in the refrigerant piping is removed and a
vacuum pump with an absolute final partial pres­sure of min. 10 mbar is used to remove all of the
air and empty the pipes. Any moisture present in
the pipes will also be removed.

NOTICE!

6.6 Adding refrigerant

The units contain a basic quantity of refrigerant. In
addition, an additional amount of refrigerant must
be added for refrigerant piping lengths exceeding 5
metres per circuit. Refer to the following chart:

Up to and

,

RXT 525-1405

DC

CAUTION!

ear protective clothing when handling refrig-

W
erant.

DANGER!

Only refrigerant in a liquid state may be used to
fill the cooling cycle!

incl. 5m

0 g/m 30 g/m

From 5m to
max. length

A vacuum of at least 20 mbar must be pro­duced!

The time required to generate the vacuum is
dependent on the final pressure pipe volume of the
indoor units and the length of the refrigerant piping.
However
minutes. Once any foreign gases and humidity
have been completely extracted from the system,
the valves on the pressure gauge station are
closed and the valves on the outdoor unit are
opened as described in the "Commissioning" sec­tion.

, the process will take at least 60

NOTICE!

Check the overheating to determine the refrig­erant fill quantity

NOTICE!

The escape of refrigerant contributes to climatic
change. In the event of escape, refrigerant with
a low greenhouse potential has a lesser impact
on global warming than those with a high
greenhouse potential.
This unit contains refrigerant
potential of 675. That means the escape of 1 kg
of this refrigerant has an effect on global
warming that is 675 times greater than 1 kg
CO2, based on 100 years. Do not conduct any

work on the refrigerant circuit or dismantle the
unit - always enlist the help of qualified experts.

.

with a greenhouse

33

3

2

4

9

5 5

11

100

6

8

7

10 10

12 12

1

min. 2%

min. 2%

REMKO RXT series

7 Condensate drainage

connection and safe
drainage

n The condensate drainage line should have an

incline of min. 2%. This is the responsibility of
the customer
proof insulation.

n When operating the unit at outside tempera-

tures below 4 °C, ensure the condensate
drainage line is laid to protect it against frost.
The lower part of the housing and condensate
tray is also to be kept frost free in order to
ensure permanent draining of the condensate.
If necessary, fit a pipe heater.

n Following installation, check that the conden-

sate run off is unobstructed and ensure that the
line is durably leak tight.

. If necessary, fit vapour-diffusion-

Fig. 41: Condensate drainage, seepage of conden­sate and strip foundation (cross-section)

1: Outdoor unit
2: Leg
3: Condensate collection tray
4: Floor bracket
5: Reinforced strip foundation

HxWxD = 300x200x800mm
6: Gravel layer for seepage
7: Condensate drainage heating
8: Drainage channel
9: Conduit for refrigerant piping and electrical

connecting line (temperature-resistant up to at

least 60°C)
10: Frost line
11: Drainage pipe
12: Soil

Condensate drainage connection

If the temperature falls below the dew point, con­densation will form on the finned condenser during

heating mode.

A condensate tray should be installed on the
underside of the unit to drain any condensate.

Fig. 42: Condensate drainage connection IT on the
wall

Fig. 43: Condensate drainage connection IT on the
ceiling

34

Safe drainage in the event of leakages

The REMKO oil separator OA 2.2 fulfils the fol­lowing list of requirements from regional regula­tions and laws.

NOTICE!

Local regulations or environmental laws, for
example the German W
(WHG), can require suitable precautions to pro­tect against uncontrolled draining in case of
leakage to provide for safe disposal of escaping
refrigerator oil or hazardous media.

NOTICE!

If condensate is removed via a duct in accord­ance with DIN EN 1717, ensure that any micro­biological contamination present on the waste­water side (bacteria, fungi, viruses) cannot
enter the unit connected to it.

ater Resource Law

35

2

1

2

1

REMKO RXT series

8 Electrical wiring

8.1 General notes

A mains cable must be installed as the power
supply to the outdoor unit and a control line to the
indoor unit, with appropriate protection.

DANGER!

All electrical installation work is to be performed
by specialist companies. Disconnect the power
supply when connecting the electrical terminals.

WARNING!

All electric lines are in accordance VDE regula­tions to dimension and to lay

NOTICE!

The electrical connection for the units must be
made at a separate feedpoint with a residual
current device in accordance with local regula­tions and should be laid out by an electrician.

.

Make the connection as follows:

1. The connection terminal block is located on
the right inside the unit (

2. Connect the unit to the control line from the
outdoor unit. See “Electrical wiring diagram”.

3. Re-assemble the unit.

Fig. 44).

e recommend using shielded wires for the

W
control lines.

Check all plugged and clamped terminals to
verify that they are seated correctly and make
permanent contact. T

ighten as required.

8.2 Connecting the indoor unit

The unit requires a six-wired control line from the
indoor unit to the outdoor unit.

e recommend installing a main / repair switch

n W

on the building close to the indoor unit. This is
the responsibility of the customer.

n Power is supplied to the outdoor unit, the

indoor unit is supplied via the control line from
the outdoor unit to the indoor unit.

n The terminal blocks for establishing the con-

nections are located inside the unit.

n If an optional condensate pump is used as an

accessory in conjunction with the unit, it may
be necessary to install an additional relay with
a higher contact rating after the switch-off con­tact on the pump to switch off the compressor.

Fig. 44: Connecting the indoor unit

1: Electrical connection (terminal box)
2: Connection of refrigerant lines

36

A B

230V/1~/50 Hz

L N 1(L) 2(N) S L N PE

PE

S

PE

1

2

8.3 Outdoor unit connection

Proceed as follows to connect the line:

1. Remove the side-panel cover

2. Choose the cable cross-section in accord-

ance with the relevant specifications.

3. Connect the lines as shown on the electrical
connection diagram.

.

8.4 Electrical wiring diagram

Connection RXT 525-685 DC

4. Fix the line in the strain relief and re-

assemble the unit.

Fig. 45: Outdoor unit connection

Fig. 46: Electrical wiring diagram

A: Outdoor unit RXT 525-685 DC AT
B: Indoor unit RXT 525-685 DC IT

1: Mains cable
2: Communication lines

37

A

B

400V/3~/50 Hz

L1 L2 L3 N

S 2(N) 1(L)

1(L) 2(N) S

1

2

REMKO RXT series

Connection RXT 1055-1405 DC

Fig. 47: Electrical wiring diagram

A: Outdoor unit RXT 1055-1405 DC AT
B: Indoor unit RXT 1055-1405 DC IT

1 Power supply cable
2: Communication lines

38

8.5 Electrical drawings

ALARM

CN33

T2

T1

CN6

4

CN5

CN9

X Y E

To CCM
Comm.Bus

HB HA

CN45

WIRE

CONTROLLER

Y/G

CN18

J7

CN23

ON/OFF

CN43

Y/G

WHITE

WHITE
(GRAY)

CN4

P1

P2

BLACK

BROWN

M

5

3

CN2
Cn1

CN3

Y/G

L

N S

REACTOR

CON2

RED

RED

DC MOTOR

DRIVER

MODLE

CON1

FAN1

3

3

M

4

CN1

CN15

CN34

DC FAN

3

Y/G

CN13

M

2

Y/G

MAGNETIC

RING

CN40

WIRE

CONTROLLER

4

MAGNETIC RING

DISPLAY

BOARD

WIRE

CONTROLLER

10

CN10

5

Y/G

12

13

3

4

5

8

7

A

6

14
15

1

B

Indoor units RXT 525-1405 DC IT

Fig. 48: Electrical drawings IT

A: Control board
B: Display circuit board
1: AC fan motor
3: DC fan motor
4: Potential-free external contact on/off
5: Potential-free alarm contact
6: MCC-1 controller/SC-1 connection (optional)

7: Communication line to outdoor unit
8: Optional connection external fan motor
12: Connection of condensate pump
13: Wired remote control connection (optional)
14: Temperature probe, evaporator
15: Temperature probe, room temperature

39

1(L) 2(N)

S L N

4/5

2/3/4/5

3 5/6

CN 3

CN 1

CN 2

CN 16

CN 60

CN 17

CN 15

CN 25

CN 1A

CN 9

CN 32

CN 30
CN 29
CN 28

CN 21

CN 7

CN 31

BURDBK

U W

V

A

2

1

5

6

7

8

9

10

11

1213

3

4

14

REMKO RXT series

Outdoor unit RXT 525 DC AT

Fig. 49: Electrical drawings

A: Control board
1: Compressor
2: Transformer
3: Connecting line to the indoor unit
4: Power supply
5: 4-way reversing valve
6: Crankcase heating
7: Condensate tray heating

8: Capacitor
9: AC fan
10: Electronic E-valve
11: DC fan motor
12: Air inlet temperature probe
13: Temperature probe for condenser outlet
14: Temperature probe for heat gas line

---: Optional

40

Outdoor unit RXT 685 DC AT

A

1

4

5

6

7

8

9

10

1112

2

3

13

BURDBK

1(L) 2(N)

S L N

4/5

2/3/4/5

3 5/6

CN 6

CN 7

CN 8

CN 60

CN 16

CN 19

CN 5

CN 3

CN 17

CN 414

CN 18

U W

V

CN 2

CN 21

U
V
W

Fig. 50: Electrical drawings

A: Control board
1: Compressor
2: Connecting line to the indoor unit
3: Power supply
4: 4-way reversing valve
5: Crankcase heating
6: Condensate tray heating
7: Capacitor

8: AC fan
9: Electronic E-valve
10: DC fan motor
11: Air inlet temperature probe
12: Temperature probe for condenser outlet
13: Temperature probe for heat gas line

---: Optional

41

BU RD

2

U

W

V

3

5

2

3

3 3

1

2(N) S

L1 L2

L3

N

2

MM

CN23 CN22

CN708A

CN707A

CN24 CN501

CN506 CN503 CN504 CN507 CN502

CN508

CN715

CN714

CN713

CN709

CN706

CN705

CN301

CN710CN777CN702CN703CN704

CN13

CN3

M

CN1 CON1

CON2

FAN1

FAN2

5

M

M M

RD

RD

BK

BK

WH

WH

WH

RD

YE

RD

BU

BU

RD

BK

RD

WH

BU

BU

WH

RD

BU

BU

A

4

5

6

7

8

9

10

11

12

3

13

1

2

44

14

15

16

17

18

19

20

21

REMKO RXT series

Outdoor unit RXT 1055-1405 DC AT

Fig. 51: Electrical drawings

A: Control board
B: Inverter board
1: Klixon
2: Low pressure switch
3: High pressure switch
4: Air inlet temperature probe
5: Temperature probe for condenser outlet
6: Temperature probe for heat gas line
7: Condensate tray heating

8: Crankcase heating
9: 4-way reversing valve
10: Communication line to indoor unit
11: Power supply cable
12: Supply line to indoor unit
13: DC fan motor
14: Compressor
15: Transformer

---: Optional

42

9 Before commissioning

After leak testing has been successfully com­pleted, connect the vacuum pump via the pressure
gauge station to the valve connections on the out­door unit (see chapter "Leak testing") and create a
vacuum.

Perform the following checks prior to putting the
unit into operation for the first time and after any
work on the cooling cycle. Record the results in the
commissioning report:

n Check all refrigerant piping and valves for leak-

tightness using leak detection spray or soapy
water

.

n Check the refrigerant piping and insulation for

damage.

n Check the electrical connection between the

indoor unit and the outdoor unit for correct
polarity.

n Check that all fastenings, mountings, etc. are

firm and at the correct level.

10 Commissioning

NOTICE!

Commissioning should only be performed by
specially trained personnel and documented
after the certificate has been issued. Observe
the operating manuals for the indoor unit and
outdoor unit when commissioning the entire
system.

Once all the components have been connected
and tested, the system can be put into operation. A
functional check should be performed to verify its
correct function and identify any unusual operating
behaviour prior to handing it over to the operator

NOTICE!

Check that the shut-of
are tight after carrying out any work on the
cooling cycle. Use appropriate sealant products
as necessary.

f valves and valve caps

.

Functional checks and test run

Check the following points:

n Leak-tightness of the refrigerant piping.
n Compressor and fan running smoothly.
n In cooling mode, cold air output by the indoor

unit, and warm air output by the outdoor unit.

n Function test of the indoor unit and all program

sequences.

n Check of the surface temperature of the suc-

tion pipe and that the vaporiser is not over­heating. To measure the temperature, hold the
thermometer to the suction pipe and subtract
the boiling point temperature reading on the
pressure gauge from the measured tempera­ture.

n Record the measured temperatures in the

commissioning report.

43

REMKO RXT series

Function test of the cooling and heating modes

1. Remove the protective caps from the valves.

2. Start the commissioning procedure by briefly

opening the shut-of
unit until the pressure gauge indicates a
pressure of approx. 2 bar.

3. Check all connections for leaks with leak
detection spray and suitable leak detectors.

4. If no leaks are found, fully open the shut-of
valves by turning them anti-clockwise using a
spanner. If leaks are found, remedy the faulty
connection. It is imperative that the vacuum
creation and drying steps are repeated.

5. Activate the main circuit breaker or fuse.

6. Use the remote control to switch on the unit

and select the cooling mode, maximum fan
speed and lowest target temperature.

7. Check the overheating, outside, inside, outlet
and vaporisation temperatures and record
the measured values in the commissioning
report. Check the correct function and set­tings of all regulation, control and safety
devices.

8. Check the unit control system using the func­tions described in the chapter "Operation".
T

imer, temperature setting, fan speeds and
switching to ventilation or dehumidification
mode.

9. Check the correct function of the condensate
drainage line by pouring distilled water into
the condensate tray
recommended for pouring the water into the
condensate tray.

10. Switch the indoor unit to heating mode.

11. During the test run, check the functionality of

all of the previously described safety devices.

12. Record the measured values into the com­missioning report and familiarise the operator
with the system.

13. Remove the pressure gauge. Check that
seals have been fitted in the sealing caps.

14. Re-install all disassembled parts.

f valves on the outdoor

f

. A bottle with a spout is

11 Shut-down

Temporary shut-down

1. Allow the indoor unit to run for 2 to 3 hours in

air 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 system using the remote con­trol.

3. Switch of

4. Check the unit for visible signs of damage

and clean it as described in the chapter
"Care and maintenance"

Permanent shut-down

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

REMKO GmbH & Co. KGor your contractual
partner will be pleased to provide a list of certified
firms near you.

f the voltage supply to the unit.

44

12 Troubleshooting, customer service and fault analysis

12.1 Troubleshooting and customer service

The unit and components are manufactured using state-of-the-art production methods and tested several
times to verify their correct function. However
detailed in the list below. For systems with an indoor unit and outdoor unit, refer to the chapter "Trouble­shooting and customer service" in both operating manuals. Please inform your dealer if the unit is still not
working correctly after all function checks have been performed!

Operational malfunctions

Malfunction Possible causes Checks Remedial measures

, if malfunctions should occur, please check the functions as

The unit does not start or
switches itself of

f

Power failure, under­voltage, defective mains
fuse / main switch in
OFF position

Damaged power supply Does all other elec.

Wait time after switching
on is too short

Temperature outside
operating range

Electrical surges caused
by thunderstorms

Malfunction of the
external condensate
pump

High-pressure / low-pres­sure switches have trig­gered

Does all other electrical
equipment function cor­rectly?

equipment function cor­rectly?

Have approx. 5 minutes
elapsed since the
restart?

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

Have there been light­ning strikes in the area
recently?

Has the pump shut down
due to a malfunction?

Check refrigerant pres­sure and look for leaks if
necessary

Check the voltage and if
necessary
come back on

Repair by specialist firm

Schedule longer wait
times

Observe temperature
ranges of indoor unit and
outdoor unit

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

Check and if necessary
clean the pump

Rectify leakage and re­start

, wait for it to

Transmission distance
too far / receiver af
by interference

Defective remote control Is the unit running in

Receiver or transmitter
unit exposed to exces-

The unit does not
respond to the remote
control

45

sive solar radiation

Electromagnetic fields
are interfering with trans­mission

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

Batteries in remote con­trol are flat

fected

Does the indoor unit
beep when pressing a
key?

manual mode?

Does it function correctly
in the shade?

Does it function after
removing potential
sources of interference?

Does the “Transmitting”
symbol appear on the
display?

Have new batteries been
inserted? Is the display
incomplete?

Reduce the distance to
less than 6 m or change
position

Replace the remote con­trol

Place the receiver and/or
transmitter unit in the
shade

Signal is not transmitted
when interference
sources are operational

Release the key / only
press one key

Insert new batteries

REMKO RXT series

Malfunction Possible causes Checks Remedial measures

The unit is running but
only provides reduced or
no cooling or heating
capacity

Filter is dirty / air inlet /
outlet opening is blocked
by debris

Windows and doors
open. Heating / cooling
load has increased

Neither cooling nor
heating mode has been
set

Fins on outdoor unit
blocked by foreign
objects

Leaking cooling cycle Are there signs of frost

Outdoor unit iced up Check outdoor unit. Has

Drainage pipe on collec­tion container clogged /
damaged

Have the filters been
cleaned?

Have structural / usage
modifications been
made?

Does the cooling symbol
appear on the display?

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

on the exchanger fins of
the indoor unit?

the cassette probe on
the outdoor unit been
correctly positioned?

Can the condensate
drain of
obstruction?

f without any

Clean the filters

Close windows and
doors / install additional
units

Correct the settings for
the unit

Check the fan or winter
fan speed control,
reduce the air resistance

Repair by specialist

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

Clean the drainage pipe
and collection container

Condensate discharge
on unit

NOTE

Faulty external conden­sate pump or float

Condensate has not
drained away and has
collected in the conden­sate drainage line

Condensate does not
drain of

Float is stuck or jammed
due to excessive dirt

f

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

Is there an incline on the
condensate drainage
line? Check there is no
blockage in the pipe.

Are the condensate
drainage lines unblocked
and is there a steady
incline? Are the conden­sate pump and liquid
level switch functioning
correctly?

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

Call out a specialist to
replace the pump

Route the condensate
drainage line with an
incline and clean

Route the condensate
drainage line with an
incline and clean it. If the
liquid level switch or the
condensate pump is
defective, have them
replaced

Should be cleaned by
specialist firm

If the outdoor unit makes noises at low outside temperatures, even although it is switched off, this is not a
malfunction. This is the winding of the compressor being run briefly in order to heat up the oil within it and
also to guarantee the viscosity at low ambient temperatures. If you do not use the unit in the winter then
you can switch off the breaker
will be required!

. Switch it back on again at least 12 hours before the next time that the unit

46

Malfunction indicated by flashing code RXT 525-1405 DC

Number

Error description

EEPROM error, indoor unit 1 OFF E0

Communication error between indoor unit and outdoor unit 2 OFF E1

Evaporator fan motor speed control not OK 4 OFF E3

Room air temperature probe faulty 5 OFF E4

Evaporator temperature probe faulty 6 OFF E5

No cooling capacity after 30 minutes 7 OFF EC

Condensate pump liquid level switch triggered 8 OFF EE

Safety shut-down due to increased power consumption 1 ON F0

of flashes

per

second)

LED timer

Error
code

Outdoor unit air inlet temperature probe faulty 2 ON F1

Condenser outlet temperature probe faulty 3 ON F2

Temperature probe for heat gas line faulty 4 ON F3

EEPROM error, outdoor unit 5 ON F4

Condenser fan speed control not OK 6 ON F5

Suction pipe temperature probe in AT faulty 7 ON F6

Inverter error 1 FLASHES P0

Over/undervoltage error 2 FLASHES P1

Safety shut-down compressor excess temperature 3 FLASHES P2

Safety shut-down due to low outside temperature 4 FLASHES P3

Compressor control faulty 5 FLASHES P4

Mode conflict 6 FLASHES P5

Low pressure alarm 7 FLASHES P6

47

YES

REMKO RXT series

Probe resistance

Indoor unit probe, evaporator; indoor unit probe, ambient air

Temperature [°C] Resistance [kW]

0 35.20

5 26.88

10 20.72

15 16.12

20 12.64

25 10.00

30 7.97

35 6.40

12.2 Indoor unit fault analysis

Error code: E0 / F4

Reason: The control board of the outdoor unit or indoor unit cannot read the unit memory

(EEPROM)

Cause:

Switch off voltage, switch on again 2 minutes

later

Replace the circuit boards of the outdoor unit

and indoor unit in turn, in order to locate the

n Installation error
n Control boards of outdoor unit or indoor unit defective

. Is the error still present?

defective EEPROM

48

Error code: E1

YES

NO

YES YES

YES

NO

NO

YES

NO

Reason: The indoor unit does not receive a signal from the outdoor unit within 110 seconds.

Cause:

Switch off voltage, switch on again 2 minutes

later

Measure the voltage between the “S” and “N”

terminals of the outdoor unit. Is the measured

Check electrical connections in the outdoor

n Electrical connection not configured correctly
n Control boards outdoor unit or indoor unit defective

. Is the error still present?

value positive?

unit. Are they OK?

Is the transformer OK?

Check electrical connections in the indoor unit.

Are they OK?

Replace the control boards of the indoor unit. Is

the fault remedied?

Replace the control boards of the outdoor unit

Replace the transformer

Replace the control boards of the outdoor unit.

Is the fault remedied?

Replace the control boards of the indoor unit

49

NO

YES

NO

YES

NO

YES

NO

YES

NO

REMKO RXT series

Error code: E3 / F5

Reason: If the fan speed of the indoor unit/outdoor unit falls below 300 rpm, the unit switches off

and the display shows error code E3 or E5

Cause:

Switch off voltage, switch on again 2

minutes later

De-energise the unit and attempt to

turn the fan wheel by hand. Does it

Check the electrical connections.

Are these correctly implemented?

Measure the voltage at the corre-

sponding connector plug on the con-

trol board (see section

dure’ on page 51). Does the

measured voltage lie within the toler-

n Electrical connection faulty
n Evaporator fan wheel defective
n Evaporator fan motor defective
n Control board faulty

. Is the error still

present?

rotate freely?

Ä

‘Proce-

ance range?

The unit operates normally.

Check the motor and the fan

wheel bearing, and replace the

defective parts.

Correctly establish the electrical

connection

Replace the control board.

Replace the fan motor. Is the fault

remedied?

50

Procedure

1 3 4 5 6

DC fan motor of the indoor unit (control chip is installed in the motor):

Switch on the voltage to the unit. In standby mode, measure the unit between terminals 1-3 and 4-3 of the
connector plug. Check the measured values against those listed in the table below
problem with the control board and it must be replaced.

. If these differ, there is a

Fig. 52: Motor measurements

Terminal Colour Voltage

1 Red 280V~380 V

2 --- ---

3 Black 0 V

4 White 17-17.5V

5 Yellow 0~5.6V

6 Blue 17-17.5V

DC fan motor of the outdoor unit (control chip is installed in the motor):

Measure the resistance between terminals 1-3 and 4-3. This should be roughly identical. If the resistance
deviates significantly, assume that the motor is defective and must be replaced.

51

YES

JOO

NO YES

JOO

NO

REMKO RXT series

Error code: EC

Reason: The evaporator probe T2 measures the actual value with the compressor start and takes

this as the reference value T
has not dropped by 2 °C for at least 4 seconds then the system assumes that the refrig-

erant is low
error code "EC".

. The measurement is performed a total of 3 times before the display shows the

. If, 5 minutes after the compressor start, the value T

Start

Start

Cause:

Switch off voltage, switch on again 2 minutes

later. Is the error still present?

Check whether the indoor unit blows out cold

Check the cooling circuit for leaks. Leaks

Check the cooling circuit for any blockages. Are

the shut-of

n Refrigerant low or cooling circuit blocked
n Evaporator probe T2 defective
n Indoor unit control board defective

.

air

found?

f valves on the outdoor unit open?

Check the position and function of the evapo-

rator probe T2. Is it correctly seated and with

the correct resistance?

Exchange the control boards of the indoor unit.

Remedy leaks and put the unit back into opera-

tion.

52

Error code: E4 / E5 / F1 / F2 / F3

NO

YES

NO

YES

Reason: If the test voltage of the probes is lower than 0.06 V or higher than 4.94 V then the display

shows the error code of the corresponding probe.

Cause:

Check the connecting cable between the con­trol board and the temperature probe. Is it OK

Check the probe for correct resistance,

depending on the temperature (see resistance

Replace the corresponding control board.

n Electrical connection faulty
n T

emperature probe defective

n Control board defective

and correctly connected?

table)

Establish a proper connection.

Replace the probe.

Fig. 53: Check the probes

53

NO

YES

NO

YES

NO

YES

NO

YES

NO

YES

REMKO RXT series

Error code: F0

Reason: Safety shutdown due to overly high current consumption of individual unit components

Cause:

Check the supply voltage. Is this correct?

Check the cooling circuit for any blockages. Is

Check the winding resistances of the com-

Check the electrical connections. Are these cor-

n Faulty power supply
n Cooling circuit blocked
n Faulty control board
n Electrical connections faulty
n Compressor defective

the cooling circuit OK?

pressor

. Are they OK?

rectly implemented?

Switch the unit off and ensure correct supply

voltage.

Remove the blockage (shut-off valve open?)

Replace the compressor.

Replace or correct the electrical connections.

Does the transformer operate fault-free?

Replace the outdoor unit.

Replace the transformer or control boards of

the outdoor unit.

54

Error code: P0

JOO

NO

NO

YES

NO

YES

NO

YES

Reason: If the power supply to the compressor controller is faulty, the display shows the error code

“P0” and the unit switches of

f

Cause:

Check the connecting cables between the con-

trol board and compressor? Are they faulty?

Check the inverter controller (see section

Ä

‘Check the inverter controller’ on page 55).

Check the condenser fan motor. Is it working

Check the winding resistances of the com-

n Electrical connection faulty
n Faulty control board
n Condenser fan motor defective or blocked
n Compressor defective

Fault eliminated?

correctly?

pressor

. Are they OK?

Establish a correct connection between the

control board and compressor

Replace the control board.

See troubleshooting fault F5

Replace the compressor.

.

Exchange the control boards of the outdoor

unit.

Check the inverter controller

Switch off the power supply to the unit. Wait until the capacitors are fully discharged and disconnect the com­pressor from the control board.

Check the resistances at the outputs of the control board with the aid of a digital voltmeter as follows:

Voltmeter Normal resistance

(+) Red (-) Black

U

V

N

W

(+) Red

¥

(multiple MW)

55

NO

YES

NO

YES

NO

YES

NO

YES

REMKO RXT series

Error code: P1

Reason: Overvoltage or undervoltage protection has tripped

Cause:

Check the power supply. Is the supply voltage

Check the electrical connections. Are they OK?

Switch the power on and put the unit into

standby mode. Measure the voltage on the

board, at contacts "P" and "N". This should be

approx. 310 V

the unit. The voltage between "P" and "N"

should now be between 220-400V. Is the cor-

Check the transformer. Is a defect present?

n Faulty supply voltage
n Refrigerant low or cooling circuit blocked
n Faulty control board

correct?

, 340 V or 380 V DC. Now start

rect voltage applied?

Switch the unit off and have the power supply

checked/corrected.

Replace the electrical connections.

Replace the control board.

Replace the control board.

Replace the transformer.

56

Error code: P2 (with units with a thermal contact)

JOO

NO

YES

NO

YES

NO

YES

YES

NO

JOO

Reason: If the test voltage of the thermal contact does not lie at 5 V, then the display shows the

error message “P2”

Cause:

Check the air flow

volumes of the

indoor unit and out-

door unit. Are they

blocked or dirty?

Switch off the power

supply to the unit

and switch it on

again after 10 mins.

Does the unit start

up?

Check the tempera-

ture of the com-

pressor

heated up?

n Faulty supply voltage
n Refrigerant low or cooling circuit blocked
n Faulty control board

. Has it

Clean the filter or heat exchanger and ensure a sufficient air flow volume.

Check the thermal contact. Is it correctly connected?

Measure the resistance of the thermal contact.

Is it 0?

Connect it correctly.

Check the cooling

circuit. Is it OK?

Replace the thermal

contact.

Replace the control board of the outdoor unit.

57

JOO

NO

NO

YES

NO

YES

NO

YES

1

REMKO RXT series

Error code: P4

Reason: Safety shutdown of inverter controller. Internal system monitoring triggered (e.g. communi-

cation problem between board and compressor

, the compressor speed is not OK)

Cause:

Check the electrical connection between the

control board and compressor

Check the inverter controller. Is this functional?

Check the condenser fan motor. Is it OK?

Check the winding resistances of the com-

n Faulty electrical connections
n Inverter regulation on board defective
n Condenser fan motor defective
n Compressor defective
n Control board defective

. Are these cor-

rectly implemented?

pressor

. Are they OK?

Establish a proper connection.

Replace the control board.

Follow the instructions for troubleshooting fault

F5

Replace the compressor

Replace the control boards of the outdoor unit.

Check individual components

Check the temperature probes

Disconnect the temperature probe from the control board and measure the resistance on the plug's contacts.

1: Multimeter

Error code: dF

Reason: The unit is in heating mode and the outdoor unit is being defrosted. After the defrost phase,

the indoor unit automatically switches back to the last operating mode.

58

12.3 Resistances of the temperature probes

Probe T1, T2, T3 and T4

Temp.

(°C)

-20 115.27 12 18.72

-19 108.15 13 17.80

-18 101.52 14 16.93

-17 96.34 15 16.12

-16 89.59 16 15.34

-15 84.22 17 14.62

-14 79.31 18 13.92

-13 74.54 19 13.26

-12 70.17 20 12.64

-11 66.09 21 12.06

-10 62.28 22 11.50

Resistance

(kW)

Temp.

(°C)

Resistance

(kW)

Temp.

(°C)

44 4.39 79 1.21

45 4.21 80 1.17

46 4.05 81 1.14

47 3.89 82 1.10

48 3.73 83 1.06

49 3.59 84 1.03

50 3.45 85 1.00

51 3.32 86 0.97

52 3.19 87 0.94

53 3.07 88 0.91

54 2.96 89 0.88

55 2.84 90 0.85

56 2.74 91 0.83

57 2.64 92 0.80

Resistance

(kW)

Temp.

(°C)

Resistance

(kW)

-9 58.71 23 10.97

-8 56.37 24 10.47

-7 52.24 25 10.00

-6 49.32 26 9.55

-5 46.57 27 9.12

-4 44.00 28 8.72

-3 41.59 29 8.34

-2 39.82 30 7.97

-1 37.20 31 7.62

0 35.20 32 7.29

1 33.33 33 6.98

2 31.56 34 6.68

3 29.91 35 6.40

4 28.35 36 6.13

5 26.88 37 5.87

6 25.50 38 5.63

58 2.54 93 0.78

59 2.45 94 0.75

60 2.36 95 0.73

61 2.27 96 0.71

62 2.19 97 0.69

63 2.11 98 0.67

64 2.04 99 0.65

65 1.97 100 0.63

66 1.90 101 0.61

67 1.83 102 0.59

68 1.77 103 0.58

69 1.71 104 0.56

70 1.65 105 0.54

71 1.59 106 0.53

72 1.54 107 0.51

73 1.48 108 0.50

7 24.19 39 5.40

8 22.57 40 5.18

9 21.81 41 4.96

10 20.72 42 4.76

11 19.69 43 4.57

59

74 1.43 109 0.48

75 1.39 110 0.47

76 1.34 111 0.46

77 1.29 112 0.45

78 1.25 113 0.43

REMKO RXT series

Temp.

(°C)

114 0.42 127 0.30

115 0.41 128 0.29

116 0.40 129 0.28

117 0.39 130 0.28

118 0.38 131 0.27

119 0.37 132 0.26

120 0.36 133 0.26

121 0.35 134 0.25

122 0.34 135 0.25

123 0.33 136 0.24

124 0.32 137 0.23

125 0.32 138 0.23

126 0.31 139 0.22

Resistance

(kW)

Temp.

(°C)

Resistance

(kW)

Temp.

(°C)

16 82.54 51 18.96

17 78.79 52 18.26

18 75.24 53 17.58

19 71.86 54 16.94

20 68.66 55 16.32

21 65.62 56 15.73

22 62.73 57 15.16

23 59.98 58 14.62

24 57.37 59 14.09

25 54.89 60 13.59

26 52.53 61 13.11

27 50.28 62 12.65

28 48.14 63 12.21

29 46.11 64 11.79

Resistance

(kW)

Temp.

(°C)

Resistance

(kW)

Probe T5

Temp.

(°C)

-20 542.7 -2 200.7

-19 511.9 -1 190.5

-18 483.0 0 180.9

-17 455.9 1 171.9

-16 430.5 2 163.3

-15 406.7 3 155.2

-14 384.3 4 147.6

-13 363.3 5 140.4

-12 343.6 6 133.5

-11 325.1 7 127.1

-10 307.7 8 121.0

-9 291.3 9 115.2

-8 275.9 10 109.8

-7 261.4 11 104.6

-6 247.8 12 99.69

-5 234.9 13 95.05

-4 222.8 14 90.66

-3 211.4 15 86.49

Resistance

(kW)

Temp.

(°C)

Resistance

(kW)

30 44.17 65 11.38

31 42.33 66 10.99

32 40.57 67 10.61

33 38.89 68 10.25

34 37.30 69 9.90

35 35.78 70 9.57

36 34.32 71 9.25

37 32.94 72 8.94

38 31.62 73 8.64

39 30.36 74 8.36

40 29.15 75 8.08

41 28.00 76 7.82

42 26.90 77 7.57

43 25.86 78 7.32

44 24.85 79 7.09

45 23.89 80 6.86

46 22.89 81 6.64

47 22.10 82 6.43

48 21.26 83 6.23

49 20.46 84 6.03

50 19.69 85 5.84

60

Temp.

(°C)

86 5.66 109 2.86

87 5.49 110 2.78

88 5.32 111 2.70

89 5.16 112 2.63

90 5.00 113 2.56

91 4.85 114 2.49

92 4.70 115 2.42

93 4.56 116 2.36

94 4.43 117 2.29

95 4.29 118 2.23

96 4.17 119 2.17

97 4.05 120 2.12

98 3.93 121 2.06

99 3.81 122 2.01

Resistance

(kW)

Temp.

(°C)

Resistance

(kW)

100 3.70 123 1.96

101 3.60 124 1.91

102 3.49 125 1.86

103 3.39 126 1.81

104 3.30 127 1.76

105 3.20 128 1.72

106 3.11 129 1.67

107 3.03 130 1.63

108 2.94

61

REMKO RXT series

13 Care and maintenance

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

This enables you to ensure the operational reli­ability of the plant at all times!

DANGER!

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

Care

n Ensure the unit is protected against dirt, mould

and other deposits.

n Only clean the unit using a damp cloth. Do not

use any caustic, abrasive or solvent-based
cleaning products. Do not use a jet of water.

n Clean the fins on the unit prior to long shut-

down periods.

Maintenance

n It is recommended that you take out a mainte-

nance contract with an annual service from an
appropriate specialist firm.

Type of task

Checks/maintenance/inspection

General

n For systems which operate year-round (e.g. in

server rooms), the maintenance intervals must
be reduced accordingly

NOTICE!

Statutory regulations require an annual leak test
for the cooling cycle dependant on the refrig­erant quantity. Inspection and documentation of
the work performed is to be carried out by spe­cialist technicians.

Commis-

sioning Monthly

l

.

Half-

yearly Yearly

l

Check voltage and current

Check function of compressor/fans

Dirt on condenser/evaporator

Check the refrigerant volume

Check condensate drainage

Check insulation

Check moving parts

Sealing test for cooling cycle

1)

see note

Cleaning the housing

1. Disconnect the power supply to the unit.

2. Open the air inlet grill on the front side and

fold it forwards or backwards.

3. Clean the grill and cover with a soft, damp
cloth.

4. Close the grill.

5. Switch the power supply back on.

l

l

l l

l

l

l

l

l

Air filter for indoor unit

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

.

dirty

l

l

l

l

l

l

1)

l

62

Cleaning the filter

1. Disconnect the power supply to the unit.

2. Open the front side of the unit by folding the

grill down/forwards (

3. Pull the filter out in an upwards direction
(Fig. 54).

4. Clean the filter with a commercially available
vacuum cleaner
so it is facing upwards (Fig. 55).

5. Dirt can also be removed by carefully
cleaning with lukewarm water and mild
cleaning agents (
should be face down.

6. If water is used, let the filter dry out properly
in the air before fitting it back into the unit.

7. Carefully insert the filter
locates correctly.

8. Close the front side as described above in
reverse order

9. Switch the power supply back on.

10. Switch the unit back on.

.

Fig. 54).

. To do so, turn the dirty side

Fig. 56). The dirty side

. Ensure that it

Fig. 55: Cleaning with a vacuum cleaner

Cleaning the condensate pump (accessories)

The indoor unit may contain an optional integrated
or separate condensate pump, which pumps out
any accumulated condensate into higher posi­tioned drains.

Observe the care and maintenance instructions in
the separate operating manual

Fig. 54: Fold the guard forwards

Fig. 56: Cleaning with lukewarm water

63

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

30

25

26

27

28

29

REMKO RXT series

14 Exploded view and spare parts lists

14.1 Exploded view - Indoor unit RXT 525-685 DC

Fig. 57: Exploded view of the unit RXT 525-685 DC IT

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

64

14.2 Spare parts list - Indoor unit RXT 525-685 DC

IMPOR

To ensure the correct delivery of spare parts, please always the device type with the corresponding serial
number (see type plate)

No. Designation

1 Air inlet grill

2 Front panel

3 Evaporator

4 Temperature probe, evaporator

5 Side covering, left

6 Wall bracket, left

7 Fan wheel

8 Fastening protection

9 Display board

10 Air filter

11 Air outlet fins

12 Housing

TANT!

13 Wall bracket, right

14 Fan motor

15 Fin motor

16 Fin motor (vertical)

17 Condensate tray

18 Infrared remote control

19 Inverter module

20 Temperature probe, indoor air

21 Transformer

22 Control board

23 E-box cover

24 Side covering, right

25 Air outlet fin (vertical)

26 Fan casing (rear)

27 Fan casing (front)

28 Fan motor mount

29 Fan motor mounting plate

30 Cooling fin

65

1

1

2

3

4

5

6

7

8

9

10

11

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

33

32

REMKO RXT series

14.3 Exploded view - Indoor unit RXT 1055-1405 DC

Fig. 58: Exploded view of the unit RXT 1055-1405 DC IT

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

66

14.4 Spare parts list - Indoor unit RXT 1055-1405 DC

No. Designation

1 Air inlet grill (large)

2 Air inlet grill (small)

3 Front panel

4 Evaporator

5 Temperature probe, evaporator

6 Side covering, left

7 Wall bracket, left

8 Fan wheel

9 Fastening protection

10 Display board

11 Air filter (large)

12 Air filter (small)

13 Air outlet fins

14 Housing

15 Wall bracket, right

16 Fan motor

17 Fin motor (vertical)

18 Condensate tray

19 Infrared remote control

20 Inverter module

21 Temperature probe, indoor air

22 Transformer

23 Control board

24 E-box cover

25 Side covering, right

26 Air outlet fin (vertical)

27 Fan casing (rear)

28 Fan casing (front)

29 Fan motor mount

30 Fan motor mounting plate

31 Cooling fin

32 Fin motor

33 Refrigerant connections cover

67

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

REMKO RXT series

14.5 Exploded view - Outdoor unit RXT 525 DC

Fig. 59: Exploded view of the unit RXT 525 DC AT

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

68

14.6 Spare parts list - Outdoor unit RXT 525 DC

IMPOR

To ensure the correct delivery of spare parts, please always the device type with the corresponding serial
number (see type plate)

No. Designation

1 Cover panel

2 Protection grid, front wall

3 Front panel

4 Fan blade

5 Fan motor

6 Fan motor mounting plate

7 Corner panel, left

8 Condenser

9 Air inlet temperature probe

10 Electronic injection valve

11 Shut-off valve, injection pipe

12 4-way reversing valve

TANT!

13 Shut-off valve, suction pipe

14 Partitioning panel

15 Temperature probe for heat gas line

16 Compressor

17 Floor panel

18 Side panel, right

19 Refrigerant connections cover

20 Control board

21 Auxiliary circuit board

22 Temperature probe for condenser outlet

23 Condensate tray heating

24 Crankcase heating

69

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

REMKO RXT series

14.7 Exploded view - Outdoor unit RXT 685 DC

Fig. 60: Exploded view of the unit RXT 685 DC AT

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

70

14.8 Spare parts list - Outdoor unit RXT 685 DC

No. Designation

1 Cover panel

2 Protection grid, front wall

3 Front panel

4 Fan blade

5 Fan motor

6 Fan motor mounting plate

7 Corner panel, left

8 Condenser

9 Air inlet temperature probe

10 Electronic injection valve

11 Shut-off valve, injection pipe

12 4-way reversing valve

13 Shut-off valve, suction pipe

14 Partitioning panel

15 Temperature probe for heat gas line

16 Compressor

17 Floor panel

18 Side section, right

19 Refrigerant connections cover

20 Terminal block cover

21 Control board

22 Inverter board

23 Cooling fins

24 Temperature probe for condenser outlet

25 Mounting plate for refrigerant connections

26 Transformer

27 Condensate tray heating

28 Crankcase heating

71

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

REMKO RXT series

14.9 Exploded view - Outdoor unit RXT 1055 DC

Fig. 61: Exploded view of the unit RXT 1055 DC AT

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

72

14.10 Spare parts list - Outdoor unit RXT 1055 DC

No. Designation

1 Cover panel

2 Protection grid, front wall

3 Front panel

4 Fan blade

5 Fan motor

6 Fan motor mounting plate

7 Side panel, left

8 Recessed grip side panel, left

9 Temperature probe for condenser outlet

10 Temperature probe for condenser outlet

11 Temperature probe for heat gas line

12 Air inlet temperature probe

13 4-way reversing valve

14 Shut-off valve, suction pipe

15 Inverter board

16 Control board

17 Liquid separator

18 Transformer

19 Side panel, right

20 Terminal block cover

21 Shut-off valve cover

22 Recessed grip front panel, right

23 Front panel, right

24 Low pressure switch

25 Electronic injection valve

26 Shut-off valve, injection pipe

27 High pressure switch

28 Compressor

29 Partitioning panel

30 Floor panel

31 Shut-off valve mounting plate

32 Condensate tray heating

33 Crankcase heating

73

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

REMKO RXT series

14.11 Exploded view - Outdoor unit RXT 1405 DC

Fig. 62: Exploded view of the unit RXT 1405 DC AT

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

74

14.12 Spare parts list - Outdoor unit RXT 1405 DC

No. Designation

1 Cover panel

2 Protection grid, front wall

3 Front panel

4 Fan blade

5 Fan motor

6 Fan motor mounting plate

7 Side panel, left

8 Condenser

9 4-way reversing valve

10 Shut-off valve, suction pipe

11 Partitioning panel

12 Shut-off valve, injection pipe

13 Air inlet temperature probe

14 Temperature probe for condenser outlet

15 Compressor

16 Control board

17 Floor panel

18 Shut-off valve mounting plate

19 Temperature probe for heat gas line

20 Auxiliary circuit board

21 High pressure switch

22 Inverter board

23 Transformer

24 Transformer

25 Front panel, right

26 Transformer

27 Low pressure switch

28 Liquid separator

29 Refrigerant connections cover

30 Condensate tray heating

31 Crankcase heating

32 Terminal block cover

33 Side panel, right

75

REMKO RXT series

15 Index

A

Assembly

Strip foundation ...................... 34

C

Care and maintenance ................... 62

Cleaning

Air filter for indoor unit ................. 62

Condensate pump ....................63

Housing ............................ 62

Condensate drainage connection and safe

drainage .............................. 34

Customer service ....................... 45

D

Display on indoor unit .................... 15

Disposal of equipment .....................8

E

Electrical drawings ..............39, 40, 41, 42

Electrical wiring ......................... 36

Electrical wiring diagram ............... 37, 38

Environmental protection ...................8

Exploded view of the unit ... 64, 66, 68, 70, 72, 74

F

Flashing code, fault display ............... 47

Function test of the cooling and heating modes

Functional checks ....................... 43

44

I

Infrared remote control ................... 14

Installation location, selection .............. 24

Installation materials ..................... 25

Intended use ............................ 7

K

Keys on the remote control ................ 16

O

Oil return measures ......................29

Ordering spare parts ...... 65

, 67, 69, 71, 73, 75

P

Propellant in accordance with Kyoto Protocol ... 9

R

Remote control

Keys ...............................16

Resistances

Temperature probes ................... 59

S

Safe drainage in the event of leakages ....... 35

Safety

Dangers of failure to observe the safety

notes ............................... 5

General ............................. 5

Identification of notes ................... 5

Instructions for the operator .............. 6

Note for inspection work .................6

Note for installation work ................ 6

Note for maintenance work .............. 6

Personnel qualifications ................. 5

Safety-conscious working ................6

Unauthorised modification ...............7

Unauthorised replacement part manufacture . 7

Selection of installation location ............ 24

Shut-down

Permanent .......................... 44

Temporary .......................... 44

Spare parts list ...........65, 67, 69, 71, 73, 75

T

Temperature probes

Resistances ......................... 59

Test run ............................... 43

Troubleshooting and customer service ....... 45

M

Maintenance ........................... 62

Malfunction indicated by flashing code ....... 47

Malfunctions

Checks .............................45

Possible causes ...................... 45

Remedial measures ................... 45

Manual mode .......................... 14

Minimum clearances ..................... 29

U

Unit installation ......................... 30

W

Wall opening ........................... 26

Warranty ............................... 7

76

77

REMKO RXT series

78

REMKO QUALITY WITH SYSTEMS

Air-Conditioning | Heating | New Energies

Telephone [phone]
Telefax [phone]

E-mail [e-mail]
URL www.remko.de

REMKO GmbH & Co. KG
Klima- und Wärmetechnik

Im Seelenkamp 12
32791 Lage

Hotline within Germany

[phone]

Hotline International

[phone]

We reserve the right to make technical changes, and provide no guarantee as to the accuracy of this data!