REMKO RVD 351DC User manual

Issue D – V03
REMKO RVD
RVD 351DC, RVD 521DC
Inverter ceiling-mounted air conditioner in split design
Operation · Technology · Spare parts

Contents
These operating instructions should be read carefully
prior to commissioning / operation of the equipment!
These instructions are part of the equipment and must always
be kept in the vicinity of the installation or on the equipment.
Subject to modifications; No liability accepted for errors or misprints!
Safety notes 4
Environmental protection and recycling 4
warranty 4
Transport and packaging 5
Description of the equipment 5
Operation 6-12
Shutdown 13
Care and maintenance 13-14
Troubleshooting and customer service 15-16
Installation instructions for qualified personnel 16-19
Installation 19-21
Tightness check 21
Condensate drain 21
Electrical connection 22
Before start up 22
Add refrigerant 23
Commissioning 23-24
Electrical connection diagram 25
Electrical circuit diagram 25-26
Unit dimensions 27
Exploded view 28-29
Spare parts list 28-29
Technical data 30
Made by REMKO
3

Safety notes
Disposal of packaging
All products are packed for trans-
port in environmentally friendly
materials. Make a valuable con-
tribution to reducing waste and
sustaining raw materials. Only
dispose of packaging at approved
collection points.
Disposal of units and
components
For the manufacture of the units
and components, only recyclable
materials have been used.
Help protect the environment by
ensuring that the units or compo-
nents (for example batteries) are
not disposed in household waste,
but only in accordance with local
regulations and in an environmen-
tally safe manner, e.g. through
authorised disposal and recycling
specialists or at collection points.
Warranty
Prerequisite for any warranty claims
is that the purchaser or his client
has completely filled out the "war-
ranty registration card" included
with any unit within the relevant
time period of sale and initial op-
eration and returned it to
REMKO GmbH & Co. KG.
The warranty conditions are listed
in the "General business and deliv-
ery conditions. The contractual par-
ties can also agree additional terms
beyond the scope of the above.
For this reason please contact your
direct contracting partner first.
Environmental
protection
and recycling
Carefully read this manual before
starting the unit for the first time. It
contains useful tips, information as
well as hazard warnings to prevent
injury or material damage. Non-
observance of this manual may
endanger persons, the environment
as well as the equipment itself and
will void any claims for liability.
■ Store this manual as well as
the refrigerant datasheet in the
vicinity of the unit.
■ The unit should only be set up
and installed by qualified per-
sonnel.
■ The setup, connection and
operation of the unit and its
components must be in accord-
ance with the operating condi-
tions stipulated in this manual
and comply with all applicable
local regulations.
■ Units designed for mobile use
should be safely set up on a
suitable floor and in a verti-
cal position. Units designed for
stationary use should only be
operated in their permanently
installed state.
■ It is prohibited to make modi-
fications or changes to equip-
ment or components supplied
by REMKO as this may cause
malfunctions.
■ Equipment and components
should not be operated in areas
where there is a heightened
damage risk. Observe the mini-
mum clearances.
■ The electrical supply should be
adapted to fulfil the require-
ments of the unit.
■ The operational safety of equip-
ment and components is only
assured providing they are used
as intended and in a fully assem-
bled state. Safety devices should
not be modified or bypassed.
■ Do not operate equipment or
components with obvious de-
fects or signs of damage.
■ All housing parts and openings,
e.g. air inlets and outlets, must
not be blocked by foreign items,
fluids or gases.
■ The equipment and components
must be kept in a safe distance
from inflammable, explosive,
combustible, aggressive and
dirty areas or atmospheres.
■ Persons coming into contact
with equipment parts may suffer
burns or injury.
■ Installation, repair and mainte-
nance work should only be car-
ried out by authorised special-
ists. Inspection and cleaning can
be performed by the operator
providing the equipment is not
under voltage.
■ Take appropriate hazard preven-
tion measures when performing
installation, repair or mainte-
nance work or cleaning the
equipment.
■ The equipment or components
should not be exposed to any
mechanical stresses, extreme
levels of humidity or direct ex-
posure to sunlight.
REMKO RVD...DC
4

The equipment is shipped in sturdy
transport packaging. Immediately
check the equipment on delivery and
make a note of any damage or miss-
ing parts on the delivery note. Inform
the forwarding agent and contractual
partner. Warranty claims at a later
date will not be accepted.
The RVD 351-521DC room air
conditioning units have a REMKO
RVD...AT outdoor component as
well as an indoor unit RVD...IT.
The outdoor unit serves to output
the heat extracted by the indoor
unit from the room being cooled.
In heating operation, the heat
absorbed by the outdoor compo-
nent can be discharged through
the indoor unit into the room being
heated.SFlbIn both operating modes,
the performance of the compressor
precisely adjusts itself to the de-
mand, thereby regulating the target
temperature with minimal tempera-
ture variations. This "inverter-tech-
nology" enables power saving over
conventional split systems and also
reduces noise emissions to a particu-
larly low level.
The outdoor component is mounted
outdoors or under the observa-
tion of certain requirements it may
be installed indoors. The outdoor
component consists of a refrigerant
circuit with compressor, fin liquefier,
liquefier fan, reverse flow valve and
flow regulator. The outdoor unit is
controlled via the regulation of the
indoor unit.
The indoor unit is designed for
indoor installation in suspended
ceilings with Euroraster dimensions.
The cassette is hidden behind the
suspended ceiling, only its cover is
visible. Operation is undertaken via
an infrared remote control unit. The
indoor unit consists of a fin vapor-
iser, vaporiser fan, regulation system
and condensation pan.
Floor consoles, wall consoles, re-
frigerant pipes and a winter control
program are available as accessories.
Description of the
equipment
Transport and
Packaging
The connection between the indoor unit and the outdoor component is
made with refrigerant pipes.
Schematic of refrigerant circuit in indoor unit - cooling
Vaporiser fan
Connection to suction pipe
Connection to injection line
Vaporiser
Schematic of outdoor refrigerant circuit
M
M
Liquefier fan Reverse flow valve
Liquefier Filter dryer Restrictor element exp. or capillary tube
Connection
valve
Injection pipe
Connection
valve
Suction pipe
Compressor
Connection
Manometer
Exterior unit
System layout
Stop valve
Interior unit
Liquefier fan
Outdoor area
Injection pipe
Suction pipe
Control line
Indoor area
Condensation line
Mains cable
Condensation line
5

Operation
infrared remote control
The infrared remote control sends
the programmed settings over a
distance of up to 6 m to the re-
ceiver of the indoor unit. Data will
only be received correctly if the
remote control is pointed at the re-
ceiver and no objects are obstruct-
ing the transmission path.
First insert the supplied batteries
(2 x type AAA) into the remote
control. To do so, pull off the flap
of the battery compartment and
insert the batteries according to
their polarization (see marks).
The indoor unit is easy to operate using an infrared remote control. This is supplied as standard. The indoor unit
beeps to acknowledge the correct transmission of data. If it is not possible to program
the indoor unit using the remote control, it can also be manually operated.
Problems are
shown in code
(see chapter Troubleshooting
and Customer service).
CAUTION
Immediately replace flat batter-
ies with a new set, otherwise
there is a risk of leakage. It is
recommended that the batteries
are removed if the equipment is
shut down for long periods.
NOTE
max. 6 m
Maximum distance
Manual operation
The indoor units can be started
manually. Press the RESET button
on the receiver unit of the cover to
activate automatic mode. In manual
operation, the following settings
apply:
Cooling mode: 24 °C,
Fan speed AUTO
Heating mode: 26 °C,
Fan speed AUTO
Pressing any button on the infra-
red remote control interrupts
manual operation
Display on indoor unit
Unit for receiving signals
from the remote control
Operation-
screen
Alarm display
Display on indoor unit
The lit display LEDs indicate the settings.
LED H red = high fan speed
LED M yellow = medium fan speed
LED L green = low fan speed
Timer-
screen
fan
Defrost
REMKO RVD...DC
6

"ECONOMIC RUNNING" button
Pressing this button will auto-
matically increase or decrease
the target temperature by 1
°C within an hour in cooling
and heating mode respective-
ly.
"AIR DIRECTION" Button
With this button, the desired
fin position can be set. There
are 5 positions and an oscillat-
ing function available.
"SWING" Button
This button directly activates
the oscillating function of the
fins for better air distribution
in the room.
"TIMER ON/OFF" button
This button serves to program
the automatic activation time
for the device within the next
24 hours.
"CLOCK" button
This button opens the time
program.
"OK" button
This button transfers the pro-
grammed data to the indoor
unit.
"CANCEL" button
This button stops the set timer
program.
"LOCK / RESET" button
(flush buttons
The left LOCK button pre-
vents subsequent operation,
the right RESET button resets
the display.
Buttons on the remote control
"ON/OFF" Button
Press this button
to start the unit.
"MODE" button
Press this button
to select the operating mode.
The
indoor unit has 5 modes:
1. Automatic mode
In this mode, the unit works in
cooling or in heating mode.
2. Cooling mode
In this mode, the warm room
air is cooled to the
desired temperature.
3. Dehumidification mode
In this mode
the room is mainly dehumidi-
fied, the adjusted temperature is
retained.
4. Heating mode
In this mode, the warm air in
the room is warmed up to the
desired temperature.
5. Circulation mode
In this mode, the air in the room
is recirculated.
Temperature selection is not
possible.
Button "Temp ▲ ▼ "
This button is used to
select the desired temperature
between 17 - 30°C.
"FAN SPEED" button
Press this button to set the
required fan speed. 4 settings
are available: automatic, high,
medium and low fan speed.
Buttons on the remote control
7

A symbol is shown on the display to indicate that the settings are being transferred.
By pressing the ON / OFF button, you can activate or deactivate your
unit. The programmed settings and adjustment values before the unit
was turned off will appear on the display.
ON/OFF Button
ON/OFF ON/OFF
Use the MODE button to select between the individual operating modes.
A total of 5 modes are available:
1. Automatic automatic selection of cooling or heating operation
2. Cooling predominantly summer operating mode
3. Dehumidification Summer or winter operating mode
4. Heating predominantly winter operating mode
5. Air circulation only for circulation of air SFlb
MODE Button
MODE
Automatic Cooling Dehumidification Heating Air circulation
MODE MODE MODE MODE
In automatic mode, the control system autonomously selects between
heating, cooling and circulating modes. The nominal temperature can
be preselected and is then applied in automatic mode. The fan speed is
automatically adapted to the given circumstances.
AUTOMATIC MODE
COOLING
or
HEATING
The nominal temperature is
below the room temperature
▲
▼
OR
or
AIR CIRCULATION
The nominal temperature is
above the room temperature
The p/q buttons can be used to reduce and increase the desired nominal
temperature.
pq Buttons
pq
Button functions
20
10:49
TEMP CLOCK
SPEED
COOL
LOW
°
C
20
10:49
TEMP CLOCK
SPEED
COOL
LOW
°
C
20
10:49
TEMP CLOCK
SPEED
COOL
LOW
°
C
20
10:49
TEMP CLOCK
SPEED
AUTO
AUTO
°
C
20
10:49
TEMP CLOCK
SPEED
COOL
LOW
°
C
20
10:49
TEMP CLOCK
SPEED
COOL
LOW
°
C
20
10:49
TEMP CLOCK
SPEED
COOL
LOW
°
C
2i
10:49
TEMP CLOCK
SPEED
COOL
LOW
°
C
2i
10:49
TEMP CLOCK
SPEED
COOL
LOW
°
C
2i
10:49
TEMP CLOCK
SPEED
FAN
LOW
°
C
2i
10:49
TEMP CLOCK
SPEED
AUTO
LOW
°
C
20
10:49
TEMP CLOCK
SPEED
COOL
LOW
°
C
2i 23
10:49 10:49
TEMP TEMP
CLOCK CLOCK
SPEED SPEED
AUTO AUTO
AUTO AUTO
°
C
°
C
2i
10:49
TEMP CLOCK
SPEED
DRY
LOW
°
C
2i
10:49
TEMP CLOCK
SPEED
HEAT
LOW
°
C
REMKO RVD...DC
8

> 6 Min.> 3 Min.
> 6 Min.
30 sec. 30 sec.
Nominal temperature
Nominal temperature -2°C
Fan operation IT
Fan operation AT
Compressor operation AT
Actual temperature Start cooling mode
Cooling mode
Stop cooling mode
Functional diagram
Stop
In cooling mode, the air in the room is cooled down to the set target
temperature. The desired room temperature is set with the ▲/▼buttons
in 1 °C increments. If the room temperature is 1 °C above the selected
nominal temperature, the indoor unit starts to cool the air in the room.
The inverter controller checks the difference between the adjusted target
temperature and the actual room temperature. If there is a large differ-
ence, the cooling output is very high. If the difference is smaller, a lower
cooling output is produced. This serves to maintain extremely even air
discharge temperature and room temperature.If the adjusted room tem-
perature is lower than approx. 2 °C, then the control system turns the
cooling function off. To protect the compressor, the regulation only turns
the cooling on again after a waiting period of 3 minutes.
COOLING mode
COOLING
OPERATION
▲
▼
and
In dehumidification mode, the room temperature is set to 24 °C. Due to
the low temperature of the refrigerant, the dew point of the air on the
vaporiser is lower. The excess moisture in the air is condensed by the
vaporiser, the room is dehumidified. The fan speed should be set to auto-
matic in order to achieve a maximum level of dehumidification. The fan
speed is automatically adapted to the given circumstances.
DEHUMIDIFICATION MODE
DE-
HUMIDIFICA-
TION-
MODE
30 sec.
Nominal temperature
Nominal temperature -2°C
Fan operation IT
Fan operation AT
Compressor operation AT
Actual temperature Start
Dehumidifying mode
Dehumidifying mode
Stop
Dehumidifying mode
Functional diagram
Operation
Stop
Low fan speed
▲
▼
AND
ON/OFF
MODE
MODE
20
10:49
TEMP CLOCK
SPEED
COOL
LOW
°
C
20
10:49
TEMP CLOCK
SPEED
DRY
AUTO
°
C
2i
10:49
TEMP CLOCK
SPEED
AUTO
LOW
°
C
2i
10:49
TEMP CLOCK
SPEED
COOL
LOW
°
C
2i
10:49
TEMP CLOCK
SPEED
FAN
LOW
°
C
22
10:49
TEMP CLOCK
SPEED
FAN
LOW
°
C
2i
10:49
TEMP CLOCK
SPEED
COOL
LOW
°
C
2i
10:49
TEMP CLOCK
SPEED
DRY
AUTO
°
C
24
10:49
TEMP CLOCK
SPEED
DRY
AUTO
°
C
24
10:49
TEMP CLOCK
SPEED
DRY
AUTO
°
C
Operation
9

HEATING-
MODE
Heating mode operational sequence
> 6 Min.> 3 Min.
> 6 Min.
30 sec. 30 sec.
Nominal temperature +5 ℃
Nominal temperature +2 ℃
Fan operation IT
Fan operation AT
Compressor operation AT
Actual temperature Stop heating
operation
Heating mode
Start heating
mode
Functional diagram
Operation
Stop
Reverse flow valve
30 sec. 30 sec.
During the defrosting cycle, the indoor unit vaporiser fan and the out-
door unit liquefier fan are switched off.
After the cycle is concluded, the fans are switched to their
previous settings.
< 7 Min.
Defrost period
15 sec. 60 sec.
Fan operation IT
Fan operation AT
Compressor operation AT Operation
Stop
Reverse flow valve
30 sec. 30 sec.
30 sec. 3 Min.
▲
▼
AND
MODE
In the heating mode, you can heat the room in spring or fall. The desired
room temperature is set with the ▲/▼buttons in 1 °C increments. If the
room temperature is 1 °C below the selected target temperature, the in-
door unit starts to heat the air in the room. The inverter controller checks
the difference between the adjusted target temperature and the actual
room temperature.
In the event of a greater difference, a higher cooling performance is created.
In the event of a smaller difference, a lower cooling performance is created.
This serves to maintain the air discharge temperature and the room tempera-
ture.
If the adjusted room temperature is still exceeded by approx. 2 °C, then
the control system turns the heating function off. To protect the com-
pressor, the regulation only turns the heater on again after a waiting
period of 3 minutes.
In heating mode, the indoor unit fan motor is switched on after a delay,
in order to prevent the discharge of cold air.
The fins on the outdoor unit could crack at low outdoor temperatures.
Regular reversal of the cooling circuit results in a defrosting action. The
display shows "H1" during the defrosting period.
HEATING Mode
FAN
20
10:49
TEMP CLOCK
SPEED
HEAT
LOW
°
C
2i
10:49
TEMP CLOCK
SPEED
DRY
AUTO
°
C
2i
10:49
TEMP CLOCK
SPEED
HEAT
LOW
°
C
23
10:49
TEMP CLOCK
SPEED
HEAT
LOW
°
C
23
10:49
TEMP CLOCK
SPEED
HEAT
MED
°
C
REMKO RVD...DC
10

The fan speed can be adjusted with this button. A selection can be made
between low, medium, high and automatic fan speed.
FAN SPEED button
▲ ▲
In ventilation mode, the air in the room is only circulated.
The room temperature cannot be changed in this mode.
The cooling or heating operation is not activated.
AIR CIRCULATION Mode
AIR CIRCULATION
MODE
FAN
SPEED
FAN
SPEED
FAN
SPEED
FAN
SPEED
FAN
SPEED
This button activates a programming function, which causes the
target temperature in cooling mode to increase after one hour by 1°C
and after two hours by 2 °C. In heating mode, the target temperature is
decreased after one hour by 1 °C and after 2 hours by 2 °C.
The display on the indoor unit goes out.
The TURBO function is used to activate the maximum fan speed
ECONOMIC
RUNNING
ECONOMIC
RUNNING
ECONOMIC RUNNING button
deactivated
The oscillating function of the air discharge fins can be adjusted with
this button. The air distribution in the room is improved with the swing
function. In order to adjust the aim of the air discharge fins to a particular
direction, the AIR DIRECTION button must be pressed briefly. In order to
activate the automatic swing function, the AIR DIRECTION button must
be pressed for longer than 2 seconds.
SWING and AIR DIRECTION Buttons
SWING SWING
deactivated
20
20
20
20
10:49
10:49
10:49
10:49
TEMP
TEMP
TEMP
TEMP
CLOCK
CLOCK
CLOCK
CLOCK
SPEED
SPEED
SPEED
SPEED
FAN
FAN
FAN
FAN
LOW
LOW
LOW
LOW
°
C
°
C
°
C
°
C
2i
10:49
TEMP CLOCK
SPEED
HEAT
LOW
°
C
2i
10:49
TEMP CLOCK
SPEED
HEAT
AUTO
°
C
2i
10:49
TEMP CLOCK
SPEED
HEAT
AUTO
°
C
2i
10:49
TEMP CLOCK
SPEED
HEAT
AUTO
°
C
2i
10:49
TEMP CLOCK
SPEED
HEAT
AUTO
°
C
2i
10:49
TEMP CLOCK
SPEED
HEAT
AUTO
°
C
2i
10:49
TEMP CLOCK
SPEED
HEAT
AUTO
°
C
2i
10:49
TEMP CLOCK
SPEED
HEAT
LOW
°
C
2i
10:49
TEMP CLOCK
SPEED
HEAT
MED
°
C
2i
10:49
TEMP CLOCK
SPEED
HEAT
HIGH
°
C
2i
10:49
TEMP CLOCK
SPEED
FAN
LOW
°
C
2i
10:49
TEMP CLOCK
SPEED
FAN
MED
°
C
11

The activation and switch-off time can be programmed with this but-
ton. The timer is activated/deactivated by means of pressing the timer
on and the timer off button. The timer symbol ON TIMER or OFF TIMER
appears. The desired turn on or turn off time is set by pressing the TIME
ADJUST button. Pressing a TIME ADJUST arrow button serves to adjust
the time in 10 min. intervals. Pressing both TIME ADJUST arrow buttons
enables the time to be set more quickly.
When the programmed time has been reached, the device is automatical-
ly turned on or off. If the indoor unit is automatically switched on, then
the mode, temperature and fan speed for the last setting is reactivated.
Pressing the OK button serves to store the selected TIMER setting.
The prior deletion of the on and off time can be achieved by pressing the
CANCEL button. The timer display on the indoor unit goes out.
CLOCK button
TIMER button TIMER ON / OFF
TIMER ON button - activation delay
Activation-
delay
TIMER OFF button - switch-off delay
CANCEL - delete timer program
Switch-off
delay
Time
stored
TIMER
ON TIMER ADJUST
TIMER
ADJUST
TIMER
ADJUST OK
TIMER
OFF
CANCEL
CLOCK
20
10:49
18:45
22:30
TEMP CLOCK
SPEED
FAN
LOW
°
C
TIMER ON
TIMER OFF
20
10:49
18:45
22:30
TEMP CLOCK
SPEED
FAN
LOW
°
C
TIMER ON
TIMER OFF
2i
10:49
TEMP CLOCK
SPEED
HEAT
LOW
°
C
2i
10:49
TEMP CLOCK
SPEED
HEAT
LOW
°
C
2i
10:49
TEMP CLOCK
SPEED
HEAT
LOW
°
C
2i
10:49
TEMP CLOCK
SPEED
HEAT
LOW
°
C
2i
10:49
TEMP CLOCK
SPEED
HEAT
LOW
°
C
2i
10:49
TEMP CLOCK
SPEED
HEAT
LOW
°
C
18:45
TIMER ON
06:30
06:30 06:30
06:30
12:30 17:30
17:30
TIMER ON
2i
10:49
TEMP CLOCK
SPEED
HEAT
LOW
°
C
06:30
TIMER ON
2i
10:49
TEMP CLOCK
SPEED
HEAT
LOW
°
C
2i
i0:49
TEMP CLOCK
SPEED
HEAT
LOW
°
C
2i
i0:49
TEMP CLOCK
SPEED
HEAT
LOW
°
C
2i
i5:50
TEMP CLOCK
SPEED
HEAT
LOW
°
C
2i
i5:50
TEMP CLOCK
SPEED
HEAT
LOW
°
C
TIMER ON TIMER ON
TIMER ON
TIMER OFF TIMER OFF
TIMER OFF
The current time can be adjusted with this button. If the clock button is
pressed for longer than 3s, the time can be set with the TIME ADJUST
button. Store
REMKO RVD...DC
12

Prior to performing any work,
ensure the equipment is iso-
lated from the voltage supply
and secured to prevent acci-
dental switch-on!
CAUTION
Shutdown
Temporary shutdown
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 unit using the
remote control.
3. Switch off the voltage supply to
the unit.
4. Cover the unit as far as pos-
sible with plastic foil in order to
protect it from the influences of
weather.
Permanent
Shutdown
Ensure that equipment and com-
ponents are disposed of in accord-
ance with local regulations, e.g.
through authorised disposal
and recycling specialists or at col-
lection points.
Contact REMKO GmbH & Co. KG
or your contract partner for a list
of specialist companies near you.
Care and maintenance
Regular care and maintenance
serves to ensure trouble-free op-
eration and long service life of the
unit.
Care
■ Ensure the indoor unit and out-
door component are protected
against dirt, mould and other
deposits.
■ Clean the equipment using a
damp cloth. Do not use any
caustic, abrasive or solvent-
based cleaning products. Do
not use a jet of water.
■ Clean the fins on the indoor
unit and outdoor component
prior to long shutdown periods.
Maintenance
■ It is recommended that
you take out a maintenance
contract with an annual service
from an appropriate specialist
firm.
This ensures the operational
reliability of your
equipment!
TIP
Type of task
Checks/Maintenance/Inspections
Commissioning Monthly Six-monthly Yearly
General • •
Measure voltage and current • •
Check compressor/fans are functioning cor-
rectly • •
Check fan is functioning correctly • •
Dirt on liquefier/vaporiser • •
Check refrigerant fill quantity • •
Check condensation drain • •
Test insulation • •
Check moving parts • •
Sealing test for refrigerant circuit • • 1)
1) see note
The statutory regulations
require an annual sealing test
for the refrigerant circuit in
relation to the refrigerant
filling level. The inspection
and documentation is to be
carried out by corresponding
specialist engineers.
NOTE
13

Air filter for indoor unit
Clean the air filter at intervals of
no more than 2 weeks.
Reduce this interval in case of
heavily soiled air.
Cleaning the cover
of the indoor unit
1. Disconnect the supply voltage
to the equipment.
2. Open and fold down the air
inlet guard on the cover. The
filter is held in place by the flaps
screwed in at the side of the
guard (Fig. 1).
3. Clean the guard using a soft,
damp cloth.
4. Switch the supply voltage back
on.
Cleaning the filter
1. Disconnect the supply voltage
to the equipment.
2. Open and fold down the air
inlet guard on the cover. The
filter is held in place by the flaps
screwed in at the side of the
guard (Fig. 1).
3. Tilt the filter and lift it out.
4. Clean the filter using a normal
vacuum cleaner (Fig. 2).
Turn the dirty side until it faces
up.
5. Any dirt can be cleaned off us-
ing lukewarm water and mild
cleaning agents.
To do so, turn the dirty side
downward (Fig. 3).
6. When using water, allow
the filter dry out properly in air
before replacing it in the unit.
7. Carefully insert the filter. Make
sure it is seated correctly.
8. Close the cover as described
above but in reverse order.
9. Switch the supply voltage back
on.
10. Switch the unit back on.
Cleaning the
condensation pump
The indoor unit includes a built-in
condensation pump,
for pumping the condensation to a
drain at a higher level.
The pump is more or less main-
tenance free. The condensation
pipes should be checked for dirt
at regular intervals. Clean them as
required.
If an external pump is also used,
observe the maintenance and care
instructions given in the separate
operating manual.
1 Guard on cover
2 Clean with a vacuum cleaner
3 Cleaning with lukewarm water
REMKO RVD...DC
14

Troubleshooting and customer service
The equipment and components are manufactured using state-of-the-art production methods and tested several times
to verify their correct function. If malfunctions should occur, please check the functions as detailed in the list below.
Please inform your dealer if the unit is still not working correctly after all the functional checks have been performed!
Malfunction
Fault Possible cause Checks Remedial measures
The unit does not start
or switches itself off
Power outage, undervoltage,
defective mains fuse / main circuit
breaker switched off
Are all other
electrical installations functioning
correctly?
Check voltage
possible wait until turned on
again.
Damaged mains cable Are all other electrical installations functioning
correctly?
Repair by
a specialist
Waiting time after switch-on too
short Have approx. 5 minutes elapsed since the restart? Schedule longer waiting periods
Temperature outside operating
range.
Are the fans in the indoor unit
and outdoor component working
correctly?
Take into account the tempera-
ture range for the indoor unit and
outdoor component
Overvoltages caused by thunder
storms Has there recently been lightning? Switch off the mains breaker and
switch it back on. Have it checked
by a specialist
Fault in external condensation
pump Did the pump shut down due to a fault? Check and if necessary clean the pump
High-pressure / low-pressure
monitors have triggered
Check refrigerant pressure and
look for leaks if necessary Rectify leakage and re-start
The unit does not respond
to the remote control
Transmission distance too far /
receiver affected by interference Does the indoor unit beep when pressing a button? Reduce the distance to less than 6 m or change position
Defective remote control Is the unit running in manual
mode? Replace the remote control
Receiver or transmitter unit ex-
posed to excessive solar radiation Does it function correctly in the shade? Place the receiver&transmitter unit in the shade
Electromagnetic fields are interfer-
ing with transmission Does it function when switching off possible sources of interference? Signal is not transmitted when in- terference sources are operational
Button in remote control jammed
/ two buttons pressed at same
time
Does the “Send”
symbol appear on the display? Release the button / only press one button
Batteries in remote control are flat Have new batteries been inserted?
Is the display incomplete? Insert new batteries
The unit is running with
reduced or without
reduced cooling / heating
performance
Filter is unclean / air inlet / outlet
blocked by foreign items Have the filters been cleaned? Clean the filters
Windows and doors open. Heat-
ing/cooling output increases
Have there been any construc-
tional /
application-related
changes?
Close windows and doors / install
additional units
Neither cooling nor heating mode
has been set Does the cooling symbol appear on the display? Correct the settings for the unit
Fins on outdoor component
blocked by foreign items
Is the fan on the outdoor com-
ponent running? Are the fins
unobstructed?
Check the fan or winter controller,
reduce the air resistance
Leaking refrigerant circuit Are there signs of frost on the fins
of the indoor unit? Repair by specialist
Outdoor component iced up
Check outdoor component. Has
the cassette sensor on the outdoor
component been correctly posi-
tioned?
De-ice and fit the sensor at the
point where the most ice forms
Condensation discharge
on unit
Drainage pipe on collection con-
tainer clogged / damaged Can the condensation drain off without any obstruction? Clean the drainage pipe and col- lection container
Faulty external condensation
pump or float Is the collection tray full of water and the pump not running?
Call out a specialist to replace the
pump
Condensation has not drained
away and has collected in the
condensation line
Is there a steady fall on the con-
densation pipe? Check there is no
blockage in the pipe.
Ensure there is a fall when laying
the condensation pipe and clean
the pipe.
Condensation does not drain off
Are the condensation lines un-
blocked and is there a steady fall?
Are the condensation pump and
float switch functioning correctly?
The condensation line must have
a fall. If necessary, clean the pipe.
A faulty condensation pump and
float switch should be replaced.
Float is stuck or jammed due to
excessive dirt. Are the LEDs on the receiver unit of the indoor unit flashing?
Should be cleaned by specialist firm
15

Problem display by blinker code
Installation instructions for qualified personnel
Important points prior to in-
stallation
■ Transport the unit in its original
packaging as close as possible
to the installation location to
avoid transport damage.
■ Check the contents of the
packaging for completeness
and check the unit for visible
transport damage. Report any
damage immediately to your
contracting party and the ship-
ping company.
■ Lift the unit at the corners and
not by the refrigerant or con-
densation connections.
■ The refrigerant pipes
(injection and suction pipe),
valves and connections must be
insulated impervious to vapour
diffusion. If necessary, also insu-
late the condensation pipe.
■ Select an installation location
which allows air to freely flow
through the inlet and outlet.
(See section "Minimum clear-
ances").
■ Do not install the unit in the
immediate vicinity of devices
with intensive thermal radia-
tion. Installation near sources of
thermal radiation reduces the
output of the unit.
■ Open the blocking valves of the
refrigerant pipes only after the
installation is complete.
■ Seal off open refrigerant pipes
with suitable caps or adhesive
strips to avoid infiltration of
moisture
and never kink or compress the
refrigerant pipes.
■ Avoid unnecessary
bends. This minimises the pres-
sure loss in the refrigerant pipes
and ensures that the compres-
sor oil can flow back without
obstruction.
LED
Operation
LED
Timer
LED
Defrost
LED
Alarm
Display
outdoor
unit
Cause Required action
E0 EEPROM error Check EEPROM
E2 Communication error between PCBs
outdoor unit & indoor unit
Check electrical connection
leads
E3
Communication error between out-
door unit main board & outdoor unit
inverter board
Check wiring
E4 Outdoor temp sensor on outdoor com-
ponent tripped
Check resistance and tem-
perature on sensor
E5 Overvoltage compressor Check compressor voltage
P0 Excessive temperature compressor Allow compressor to cool
P1 High pressure sensor has triggered Check refrigerant pressure
P2 Low pressure sensor has responded Check refrigerant pressure
P3 Compressor power consumption too
high
Check compressor power
consumption
P4 Compressor discharge gas over 105°C Clean liquefier, check refrig-
erant circuit
P5 Liquefier temperature over 65°C Clean liquefier, check refrig-
erant circuit
P6 Voltage protection main board outdoor
unit Check voltage
flashes
rapidly
Sensor air circulation / sensor liquefier
tripped
Check resistance
flashes
rapidly
Communication error between outdoor
unit & indoor unit
Check electrical connection
leads
flashes
rapidly Mode malfunction
Switch system off
flashes
slowly
flashes
slowly
flashes
slowly
flashes
slowly
Sensor liquefier / outdoor temp faulty
or not correctly connected
Read off error code on
outdoor unit
Check sensors
flashes
rapidly Condensate pump float switch faulty Check condensate pump and float switch
REMKO RVD...DC
16

■ Make special preparations
regarding the oil return if the
outdoor component is located
above the indoor unit. (See sec-
tion "Oil return flow measures").
■ Add refrigerant if the basic
length of the refrigerant pipe
exceeds 5 metres.
The quantity of additional refrig-
erant is given in chapter "Add
refrigerant".
■ Only use the union nuts for the
refrigerant pipes included in
the delivery, and remove them
shortly before connecting the
refrigerant pipes.
■ Establish all electrical connections
in accordance with the relevant
DIN- and VDE standards.
■ See electrical connection diagram
Always properly insert electrical
cables into the electrical ter-
minals. Otherwise a fire could
result.
Wall openings
■ A wall opening of at least 70
mm diameter and 10 mm slope
from the inside to the outside
must be made for each indoor
unit.
■ We recommend that the inside
of the hole is padded or lined,
e.g. using a PVC tube, to pre-
vent the pipes being damaged.
■ After installation, the wall
opening should be closed off on
the building side with a suitable
sealant. Do not use materials
containing cement or lime!
Installation material
The indoor unit is fastened
using a wall bracket and 4 threaded
screws (provided by the customer).
The outdoor component is at-
tached with 4 screws and a wall
bracket to the wall or fixed by a
floor bracket to the ground.
Pipes and cables in wall breakthrough
Control line
Condensation line
Injection pipe
Suction pipe
PVC tube
Selection of the installation
location
Interior unit
The indoor unit is designed for
horizontal wall installation above
doors. However, it can also be
used on the upper wall area
(min. 1.75 m from upper edge of
floor).
Exterior unit
The outdoor component is de-
signed for horizontal base instal-
lation in outdoor areas. It should
be placed on level, flat and firm
ground. The unit should also
be secured to prevent toppling.
The outdoor component can be
set up outside as well as inside a
building. For external installation,
please observe the following notes
to protect the unit from weather
conditions.
Rain
The unit should be at least 10 cm
off the ground when mounted on
the roof or ground. A floor bracket
is optionally available.
Sun
The liquefier on the outdoor unit
radiates heat.
Exposure to direct sunlight will
further increase the temperature of
the fins and reduce the heat out-
put of the finned heat exchanger.
The outdoor unit should therefore
be installed as near as possible to
the north side of the building. If
necessary, take measures to pro-
vide sufficient shade (responsibility
of customer). One possible solu-
tion is to build a small roof. These
measures should not affect the
flow of warm outlet air.
Windbreak
Wind
Wind
If the unit is being installed in
windy areas, ensure that the warm
outlet air discharges in the main
wind direction. If this is not the
case it may be necessary to install
a windbreak (provided by the cus-
tomer). Ensure that the windbreak
does not adversely affect the air
intake to the unit.
17

Warm air Cold
Fresh air
Light
well
Exterior unit
Warm air
Light
well
Additional
fan
5 Installation inside buildings
Installation inside buildings
■ Ensure there is adequate heat
dissipation when placing the
outdoor component in cellars,
attics, adjoining rooms or halls
(Fig 5).
■ Install an additional fan with a
rated flow comparative to that
of the outdoor unit being in-
stalled in the room. This is used
in conjunction with ventilation
ducts to compensate any pres-
sure losses
(Figure 5).
Minimum clearances
Observe the minimum clearances to allow access for maintenance and
repair work and facilitate optimum air distribution.
500
1000
1000
1000
1000
E
C
B
A
D
Air intake
Air outlet
All values in mm
Minimum clearances
■ Ensure a continuous and unob-
structed air flow from outside,
preferably using sufficiently
large air intakes placed opposite
each other
(Figure 5).
■ Comply with any regulations
and conditions affecting the
statics of the building. If neces-
sary, fit acoustic installation.
RVD 351DC AT RVD 521DC AT
A 150 mm
B 900 mm
C 500 mm
D 150 mm
E 500 mm
Minimum clearance to snow
20 cm
Snow
Snow
The unit should be wall-mounted
in areas of heavy snowfall.
Installation should be at least 20
cm above the expected level of
snow to prevent snow from enter-
ing the outdoor component. An
optional wall bracket is available as
an accessory.
REMKO RVD...DC
18

Oil return measures
If the outdoor component is
installed at a higher level than
the indoor unit, suitable oil return
measures must be taken. Usually
an oil pump bend is installed for
every 2.5 metres of height differ-
ence.
Oil return measures
Exterior unit
Oil pump bend
in suction pipe to
outdoor unit
1 x every 5
metres of rising
pipe
Radius:
50 mm
max. 5/10 m
Interior unit
Installation
Unit installation
The indoor unit is mounted face
down on four threaded rods. Take
into account the ceiling grid and
any other installations.
1. Use the dimensions of the ceil-
ing cassette (Fig. 8) to mark the
fixing points for the threaded
rods on structural parts ap-
proved to support the static
load above the suspended ceil-
ing.
2. Fit any connection nozzles
before installing the unit if con-
nections to a second room or a
fresh air intake are required.
See section - Connections to
Installation should only be
performed by authorised spe-
cialists.
NOTE
a second room or a fresh air
intake.
3. Fit the indoor unit onto the
threaded rods and use the
lower nuts to level the unit
(Fig. 9).This ensures that the
condensate drains into the col-
lection tray.
4. Make sure that clearance A,
(Fig. 10) as specified in the ta-
ble below, is provided between
the underside of the suspended
unit and the underside of the
fastening surface.
5. Connect the refrigerant pipes,
electrical cables and condensa-
tion line to the indoor unit as
described below.
6. Check that the unit is level.
7. The final task is to tighten the
counternuts and attach the
cover.
Dimensions in mm RVD 351-
521DC
Distance A 35 mm
Distance B 25 mm
Mounting the unit 620 mm
x400- mm
9 Hooking in the unit
10 Fastening the unit
Structural component
Structural component
B
A
8 Mounting the unit
400
620
All dimensions in mm
19

The units are factory filled with
dry nitrogen to check for leaks.
The pressurised nitrogen is
released when loosening the
union nuts.
CAUTION
Connection of
refrigerant pipes
The on-site connection of the
refrigerant pipes is made at the
rear of the unit.
It may be necessary to fit a reducer
or flared adapter to the indoor
unit. These fittings are included
as standard with the indoor unit.
Once installed, the connections
should be made tight against va-
pour diffusion.
The following instructions describe
the installation of the refriger-
ant circuit and the assembly of
the indoor unit and the outdoor
component.
1. The required pipe diameters are
given in the table "Technical
data".
2. Remove the factory-fitted pro-
tective caps and union nuts on
the connections. These should
be used during installation.
3. Before flanging the refrigerant
pipes, ensure that the union nut
is fitted on the pipe.
4. Prepare the laid refrigerant
pipes as shown below
(Fig. 6+7).
Only employ tools and com-
ponents suitable for refrigera-
tion applications.
NOTE
Flanging tool
7 Flanging the refrigerant pipe
Refrigerant pipe
Deburrer
6 Deburring the refrigerant pipe
8 Correct flange shape
Tighten 1. spanner
Counter
2. spanner
9 Tighten the fitting
Tightening
torque:
“ 15-20 Nm
“ 33-40 Nm
“ 50-60 Nm
“ 65-75 Nm
“ 95-105 Nm
5. Verify that the shape of the
flange is correct(Figure 8).
6. First connect and hand-tighten
the refrigerant connections
to ensure they are correctly
seated.
7. Now fully tighten the fittings
using 2 suitably sized open-
ended spanners. Use one span-
ner to counter the force when
tightening the fitting (Figure
9).
8. Use insulation hoses which are
designed for this temperature
range and diffusion tight.
9. Lay the refrigerant pipes from
the indoor unit to the outdoor
component. In doing so, ensure
that they are sufficiently at-
tached and take measures for
the oil return, if necessary!
10. Observe the permitted bend-
ing radius for the refrigerant
pipes during installation. Never
bend a pipe twice in the same
place. Brittle pipes and potential
cracking are the consequences.
11. Use the wall or floor brackets
to fit the outdoor component
against structural parts ap-
proved to support the static
load (refer to the installation
instructions for the brackets).
REMKO RVD...DC
20