REMKO MVT Series User manual

Edition GB – C01
REMKO MVT
MVT 600 DC, MVT 900 DC, MVT 950 DC, MVT 1050 DC
Inverter multisplit outdoor units
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
This operating manual is a translation of the German original.
Subject to modifications; No liability accepted for errors or misprints!
Safety notes 4
Environmental protection and recycling 4
Warranty 4
Intended use 5
Transport and packaging 5
Description of the equipment 5-6
Combinations 7-8
Operation 9
Shutdown 9
Care and maintenance 9
Troubleshooting and customer service 10-11
Installation instructions for qualified personnel 12-14
Installation 14-15
Tightness check 15-16
Electrical connection 16
Electrical circuit diagram 17-18
Electrical connection diagram 19
Before commissioning 20
Condensate connection and safe drainage
20
Add refrigerant 20
Commissioning 20-23
Unit dimensions 24
Exploded views / Spare parts lists 25
Technical data 26-27
EC–Declaration of Conformity 28
Made by REMKO
3

Safety notes
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 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
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. through authorised
disposal and recycling specialists or
at collection points.
Warranty
Prerequisite for any warranty
claims is that the purchaser or his
client has completely filled out the
"warranty registration card" and
commissioning report included
with the unit at the time when
the equipment was purchased and
commissioned and returned the
completed card to REMKO GmbH
& Co. KG.
The warranty conditions are listed
in the "General business and
delivery conditions. The contractual
parties 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
personnel.
■ The setup, connection and
operation of the unit and
its components must be in
accordance with the operating
conditions stipulated in this
manual and comply with all
applicable local regulations.
■ Units designed for mobile use
should be safely set up on a
suitable floor and in a vertical
position. Units designed for
stationary use should only be
operated in their permanently
installed state.
■ It is prohibited to make
modifications or changes to
equipment or components
supplied by REMKO as this may
cause malfunctions.
■ Equipment and components
should not be operated in areas
where there is a heightened
damage risk. Observe the
minimum clearances.
■ The electrical supply should
be adapted to fulfil the
requirements of the unit.
■ The operational safety of
equipment and components is
only assured providing they are
used as intended and in a fully
assembled state. Safety devices
should not be modified or
bypassed.
■ Do not operate equipment
or components with obvious
defects or signs of damage.
■ All housing parts and openings,
e.g. air inlets and outlets, must
not be blocked by foreign items,
fluids or gases.
■ The equipment and components
must be kept 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
maintenance work should only
be carried out by authorised
specialists. Inspection and
cleaning can be performed
by the operator providing the
equipment is not under voltage.
■ Take appropriate hazard
prevention measures when
performing installation, repair or
maintenance work or cleaning
the equipment.
■ The equipment or components
should not be exposed to any
mechanical stresses, extreme
levels of humidity or direct
exposure to sunlight.
REMKO MVT
4

The equipment is shipped in sturdy
transport packaging. Immediately
check the equipment on delivery
and make a note of any damage or
missing parts on the delivery note.
Inform the forwarding agent and
contractual partner.
Warranty claims at a later date will
not be accepted.
Description of the
equipment
Transport and
packaging
The outdoor unit serves to output
the heat extracted by the indoor
unit from the room being cooled.
In heater operation, 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" enables power saving
over a conventional split-system
and also reduces noise emissions
to a particularly low level.
The outdoor unit can be installed
outdoor or in indoor areas,
providing certain requirements are
met. The indoor unit is designed
for installation high up on interior
walls. It is operated via an infrared
remote control.
The outdoor unit is comprised of
a circuit containing a compressor,
a liquefier with fin vaporisers, three
electronic expansion valves and
a liquefier fan. The outdoor unit is
combinable with REMKO indoor
units of series MXW in accordance
with the cooling output (see
chapter "Combinations").
The outdoor unit refrigerant circuit
is controlled by the regulator in
the indoor unit. In order to enable
operation of the device at low
outdoor temperatures, a thermal
condenser pressure regulator
serves as winter controller to
regulate the speed of the liquefier
fan.
Floor consoles, wall consoles and
refrigerant pipes are available as
accessories.
Schematic of outdoor refrigerant circuit
TCE
TCE
TCE
Liquefier fan
Reverse flow valve
Liquefier Flow regulator
Capillary
tube
Injection pipe A
Injection pipe B
Injection pipe C
Connection valve
Suction pipe C
Connection valve
Suction pipe A
Connection valve
Suction pipe B
Compressor
Intended use
Depending on the model, the
equipment and the additional
fittings with which it is equipped
is only intended to be used as an
air-conditioner for the purpose of
cooling or heating the air in an
enclosed room.
Different or additional use shall not
be classed as intended use. The
manufacturer/supplier assumes no
liability for damages arising from an
unintended use of the equipment.
The user bears the sole risk in such
cases.
Using the equipment as intended
also includes working in accord-
ance with the operating manual
and installation instructions and
complying with the maintenance
requirements.
5

Outdoor unit
Indoor area A
Outdoor area
Stop valves
Liquefier fan
Indoor area B
Indoor area C Indoor areaD
Indoor unit Indoor unit
Indoor unit Indoor unit
System design
The connection between indoor units (A, B, C, D) and outdoor units (connection circuit A, B, C, D) of the
outdoor unit is achieved with refrigerant pipes and a control line.
Injection pipe
Suction pipe
Injection pipe
Suction pipe
Condensation line Condensation line
Condensation line Condensation line
Mains cable
Control line Control line
REMKO MVT
6

The following indoor units can be used together with MVT series outdoor units:
MXW / MXD / MXT
200/201 260/261 350/351 520/521
One indoor unit
Combination 1 •
Combination 2 •
Combination 3 •
Combination 4 •
Two indoor units
Combination 5 • •
Combination 6 • •
Combination 7 • •
Combination 8 • •
Combination 9 • •
Combination 10 • •
Combination 11 • •
Combination 12 • •
Three indoor units
Combination 13 • • •
Combination 14 • • •
Combination 15 • • •
Combination 16 • • •
Combination 17 • • •
Combination 18 • • •
Combination 19 • • •
Combination 20 • • •
Combination 21 • •
Combination 22 • • •
MXW / MXD / MXT
200/201 260/261 350/351 520/521
One indoor unit
Combination 1 •
Combination 2 •
Combination 3 •
Combination 4 •
Two indoor units
Combination 5 • •
Combination 6 • •
Combination 7 • •
Combination 8 • •
Combination 9 • •
Combination 10 • •
Outdoor unit MVT 900 DC
Outdoor unit MVT 600 DC
Indoor units
The following combinations are possible:
Series MXD 200-520 Series MXT 260-520
Series MXW 200-520
Combinations
7

Outdoor unit MVT 950 DC
MXW / MXD / MXT
200/201 260/261 350/351 520/521
One indoor unit
Combination 1 •
Combination 2 •
Combination 3 •
Combination 4 •
Two indoor units
Combination 5 • •
Combination 6 • •
Combination 7 • •
Combination 8 • •
Combination 9 • •
Combination 10 • •
Combination 11 • •
Combination 12 • •
Combination 13 • •
Combination 14 • •
Three indoor units
Combination 15 • • •
Combination 16 • • •
Combination 17 • • •
Combination 18 • • •
Combination 19 • • •
Combination 20 • • •
Combination 21 • • •
Combination 22 • • •
Combination 23 • • •
Combination 24 • • •
Combination 25 • • •
Combination 26 • • •
Combination 27 • • •
Combination 28 • • •
Combination 29 • • •
Four indoor units
Combination 30 • • • •
Combination 31 • • • •
Combination 32 • • • •
Combination 33 • • • •
Combination 34 • • • •
Combination 35 • • • •
Combination 36 • • • •
Combination 37 • • • •
Combination 38 • • • •
Combination 39 • • • •
Combination 40 • • • •
Combination 41 • • • •
MXW / MXD / MXT
200 260 350 520
One indoor unit
Combination 1 •
Combination 2 •
Combination 3 •
Combination 4 •
Two indoor units
Combination 5 • •
Combination 6 • •
Combination 7 • •
Combination 8 • •
Combination 9 • •
Combination 10 • •
Combination 11 • •
Combination 12 • •
Combination 13 • •
Combination 14 • •
Three indoor units
Combination 15 • • •
Combination 16 • • •
Combination 17 • • •
Combination 18 • • •
Combination 19 • • •
Combination 20 • • •
Combination 21 • • •
Combination 22 •••
Combination 23 • • •
Combination 24 • • •
Combination 25 • • •
Combination 26 • • •
Combination 27 • • •
Combination 28 • • •
Combination 29 •••
Combination 30 • • •
Combination 31 • • •
Combination 32 • • •
Four indoor units
Combination 33 • • • •
Combination 34 • • • •
Combination 35 • • • •
Combination 36 • • • •
Combination 37 • • • •
Combination 38 • • • •
Combination 39 • • • •
Combination 40 • • • •
Combination 41 • • • •
Combination 42 • • • •
Combination 43 • • • •
Combination 44 • • • •
Combination 45 • • • •
Combination 46 • • • •
Combination 47 • • • •
Combination 48 • • • •
Combination 49 • • • •
Combination 50 • • • •
Combination 51 • • • •
Combination 52 • • • •
Combination 53 • • • •
Combination 54 • • • •
Outdoor unit MVT 10050 DC
REMKO MVT
8

Operation
Regular care, maintenance and
observation of some basic points
will ensure trouble-free operation
and a long service life.
Care and maintenance
Prior to performing any
work, ensure the equipment
is isolated from the voltage
supply and secured to prevent
accidental switch-on!
CAUTION
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 system using
the remote control
3. Switch off the voltage supply
to the unit.
4. Cover as much of the unit as
possible with plastic foil to
protect it against the weather.
Permanent Shutdown
Ensure that equipment and
components are disposed of
accordance with local regulations,
e.g. through authorised disposal
Shutdown
Care
■ Ensure the unit is protected
against dirt, mould and other
deposits.
■ Clean the unit using a damp
cloth.
Do not use a jet of water.
■ Do not use any caustic, abrasive
or solvent-based cleaning
products.
When operating the fan, clean
the fins of the unit prior to long
shutdown periods.
Maintenance
■ It is recommended that
maintenance contract with
annual maintenance interval
with an appropriate specialist
company.
This ensures the operational
reliability of your equipment!
TIP
The compressor in the outdoor
unit is operated by means of
regulating the control board in the
outdoor unit.
The chapter on "Regulation" in
the manual for the outdoor unit
must therefore be observed.
Type of task
Checks/Maintenance/Inspections
Commissioning Monthly Six-monthly Yearly
General • •
Measure voltage and current • •
Function compressor • •
Check fan is functioning correctly • •
Dirt on liquefier • •
Check refrigerant fill quantity • •
Check condensation drain • •
Test insulation • •
Check moving parts • •
Sealing test for refrigerant circuit • • 1)
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
1) see note
and recycling specialists or at
collection points.
Contact REMKO GmbH & Co. KG
or your contract partner for local
specialist companies near you.
Help save on energy consump-
tion in stand-by mode! If the
device, system or component
is not in use, we recommend
disconnecting the power sup-
ply. Components with a safety
function is excluded from our
recommendation!
TIP
9

The unit has been manufactured using state-of-the-art production methods and tested several times to ensure its
correct function. If malfunctions should occur, please check the unit as detailed in the list below. For installations
with an indoor unit and outdoor unit, refer to the chapter "Troubleshooting and customer service" in both
manuals. Please inform your dealer if the unit is still not working correctly after all the functional checks have been
performed!
Troubleshooting and customer service
Malfunction
The unit is running
with reduced or no
cooling output.
Exchange refrigerant lines
Are the injection pipes and
suction pipes of circuits A, B and
C correspondingly connected?
Check by a specialist
Exchange the electrical control
cable
Are the control pipes and
refrigerant pipes of circuits
A, B and C correspondingly
connected?
Check by a specialist
Air inlet and/or air outlet are
blocked by debris.
Debris in air inlet and air outlet
area?
Clean the fins.
Reduce the air resistance.
Thermal or wind load
was increased.
Have there been any
constructional / application-
related changes?
Reduce the thermal/wind loads
by implementing appropriate
measures.
No heat output possible. Is the fan on the outdoor unit
running?
Fan / winter controller should be
checked.
Leaking refrigerant circuit Are there signs of severe frost
on the large stop valve? Repair by a specialist.
Fault Possible cause Check Remedial measures
The unit does not start
or switches itself off.
Power outage, undervoltage Are all electrical installations
functioning correctly?
Check voltage if necessary wait
before switching back on
Defective mains fuse
Main circuit breaker is open
Are all lighting circuits
functioning correctly?
Replace mains fuse
Close main circuit breaker
Damaged mains cable Are all electrical installations
functioning correctly? Repair by a specialist
Waiting time after switch-on too
short
Is there a restart after approx. 5
minutes? Schedule longer waiting periods
Temperature outside operating
range
Are the fans in the unit still
working? Observe the temperature ranges
Occasional overvoltage or
undervoltage Check by a specialist Turn the equipment off and back on
Switch-off contact in external
condensation pump has opened
Is the external condensation
pump on the indoor unit
"faulty”?
Clean the condensation pump
drain
Have the pump replaced
The suction pipe and /
or liquid separator on
the compressor have
iced up
Thermal load has increased
Is the outdoor unit running
continuously?
Reduce the thermal load If
necessary, install an additional
device / insulate iced up
components
REMKO MVT
10

Display Cause Required action
E0 EEPROM error Switch off the power to device for 1 min.
Contact specialist dealer
E1 Sensor suction pipe circuit 1 faulty / connection interrupted Check the resistance of the sensor
( at 20°C=12.6kΩ/ 30°C=7.9kΩ)
E2 Sensor suction pipe circuit 2 faulty / connection interrupted Check the resistance of the sensor
( at 20°C=12.6kΩ/ 30°C=7.9kΩ)
E3 Sensor suction pipe circuit 3 faulty / connection interrupted Check the resistance of the sensor
( at 20°C=12.6kΩ/ 30°C=7.9kΩ)
E4 Sensor discharge liquefier faulty / connection interrupted Check the resistance of the sensor
( at 20°C=12.6kΩ/ 30°C=7.9kΩ)
E5 Compressor voltage monitoring has tripped Switch off the power to device for 1 min
E6 Sensor suction pipe circuit 4 faulty / connection interrupted Check the resistance of the sensor
( at 20°C=12.6kΩ/ 30°C=7.9kΩ)
E7 Communication error between outdoor and indoor unit Contact specialist dealer
P0 Excessive temperature (Klixon) compressor
Check refrigerant
Check the resistance of the compressor
sensor (normal 0Ω)
P1 High pressure sensor has responded
Check refrigerant filling level,
check liquefier for soiling,
check fan AT
P2 Low pressure sensor has responded Check stop valve AT, check refrigerant,
check electronic expansion valves,
P3 Overcurrent compressor has responded Check winding resistance of the
compressor (1Ω= U-V / U-W / V-W)
P4
LED AT
flashes 9 times
Rotational speed monitoring on compressor has responded Check compressor connections and PCB
P4
LED AT
flashes 13 times
Rotational speed monitoring on compressor (inverter module)
has responded
Check connections CN4, CN1 on the AT PCB
Contact specialist dealer
P5 Excess temperature sensor on outdoor unit unit has responded Exterior temperature > 1h under -15°C
P6 Sensor outlet liquefier has responded
(Condensation temperature over 65°C)
Clean liquefier
Reduce air inlet temperature
Problem display by blinker code
11

Installation instructions for qualified personnel
■ Observe the manuals for the
indoor unit and outdoor unit
when installing the entire
system.
■ Transport the unit in its original
packaging as close as possible
to the installation location. This
avoids transportation damage.
■ Check the contents of the
packaging for completeness
and check the unit for visible
transport damage.
Immediately notify any
deficiencies to the contractual
partner and forwarding agent.
■ Lift the unit at the corners
and not by the refrigerant or
condensation connections.
■ The refrigerant pipes (injection
and suction pipe), valves and
connections to make them
tight against vapour diffusion.
If necessary, also insulate the
condensation line.
■ Select an installation location
which allows air to freely
flow through the inlet and
outlet (see section "Minimum
clearances")
■ Do not install the unit in
the immediate vicinity of
devices with intensive thermal
radiation.
Installation near thermal
radiation reduces the unit
output.
■ Only open the stop valves
for the refrigerant pipes after
installation has been fully
completed.
■ Seal off open refrigerant pipes
with suitable caps or adhesive
strips to avoid the infiltration
of moisture and never kink or
compress the refrigerant pipes.
■ Avoid unnecessary bends. This
minimises the pressure loss
in the refrigerant pipes and
ensures that the compressor
oil can flow back without
obstruction.
■ Make special preparations
regarding the oil return if the
outdoor unit is located above
the indoor unit.
(see section Oil return
measures).
■ Add refrigerant if the basic
length of the refrigerant pipe
exceeds 5 metres.
For the quantity of additional
refrigerant, refer to 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 connections in
accordance with the relevant
DIN- and VDE standards.
■ See electrical connection
diagram Ensure the electrical
cables are properly connected
to the terminals, otherwise
there is a risk of fire.
Important information
prior to commissioning Always pay attention to the
affiliation of the electrical and
refrigerant pipes!
The connections of the
individual circuits may not be
mixed up.
A mistake in this area can have
fatal consequences!
CAUTION
Label the refrigerant pipes
(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.
NOTE
Wall openings
■ The wall breakthrough must
have a diameter of min.
diameter of min. 70 mm and
a fall of 10 mm from inside to
outside for each indoor unit.
■ We recommend that the
inside of the hole is padded or
lined, e.g. using a PVC tube,
to prevent the pipes being
damaged.
(Page 11, figure 1).
■ After installation has been
completed, use a suitable
sealing compound to close
off the wall breakthrough
(responsibility of customer) .
Do not use materials containing
cement or lime!
Installation material
The outdoor unit is fastened with
4 screws and a wall bracket to the
wall or fixed by a floor bracket to
the ground.
Only use fixing materials
which are suitable for the
given application.
NOTE
Different refrigerant pipes are
required depending on the
cooling output of the indoor
unit.
NOTE
REMKO MVT
12

Control line
Condensation line
Injection pipe
Suction pipe
PVC tube
1 Pipes and cables in wall breakthrough
Selection of the installation
location
The outdoor unit is designed for
horizontal free-standing use in
outdoor areas.
It should be placed on level,
flat and firm ground. The unit
should also be secured to prevent
toppling.
The outdoor unit can be installed
both inside and outside buildings.
In the case of outdoor installation,
please follow the instructions given
below to protect the unit against
the weather.
Rain
The unit should be at least 10 cm
off the ground when mounted on
the roof or ground.
An optional floor bracket is
available as an accessory.
Sun
The liquefier on the outdoor unit
radiates heat.
Exposure to direct sunlight will
further increase the temperature
of the fins and reduce the heat
output of the liquefier.
The outdoor unit should therefore
be installed as near as possible to
the north side of the building.
If necessary, take measures
to provide sufficient shade
(responsibility of customer). One
possible solution is to build a small
roof.
However, the discharging warm air
flow may not be affected by the
measures.
Wind
If the unit is being installed
in windy areas, ensure the air
discharges in the prevailing wind
direction. If this is not the case
it may be necessary to install
a windbreak (provided by the
customer) (Figure 2).
Ensure that the windbreak does
not adversely affect the air intake
to the unit.
Wind
2 Windbreak
20 cm
Snow
3 Minimum clearance to snow
Snow
The unit should be wall-mounted
in areas of heavy snowfall.
Installation should then be min.
20 cm above the expected level
of snow to prevent snow from
entering the outdoor unit (Fig 3).
An optional wall bracket is
available as an accessory.
Installation inside buildings
■ Ensure there is adequate heat
dissipation when placing the
outdoor unit in cellars, attics,
adjoining rooms or halls
(Figure 4).
■ Install an additional fan with
a rated flow comparative to
that of the outdoor unit being
installed in the room. This
is used in conjunction with
ventilation ducts to compensate
any pressure losses
(Figure 4).
■ Ensure a continuous and
unobstructed air flow from
outside, preferably using
sufficiently large air inlets
(Figure 4).
■ Comply with any regulations
and conditions affecting
the statics of the building.
If necessary, fit acoustic
installation.
Warm air Cold
Fresh air
Light
well
Outdoor unit
Warm air
Light
well
Additional
fan
4 Installation inside buildings
13

Minimum clearances
The following illustration indicates
the minimum clearances for
trouble-free operation of the
equipment.
The protective zones serve to
provide unhindered air intake and
discharge, as well as providing
sufficient room for performing
maintenance and repairs and
preventing the unit from being
damaged.
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 an oil pump
bend is installed for every 2.5 me-
tres of height difference.
Installation
NOTE
Installation should only be
performed by authorised
specialists.
The following instructions describe
the installation of the refrigerant
circuit and the assembly of the
indoor unit and outdoor unit.
1. The required pipe diameters are
given in the table "Technical
data" for the outdoor unit.
2. Install the indoor unit can
connect the refrigerant pipes as
described in the manual for the
indoor unit.
3. Observe the permitted bending
radius for the refrigerant pipes
during installation. Never bend
a pipe twice in the same place.
Brittle pipes and potential
cracking are the consequences.
Minimum clearances
Oil return measures
Outdoor unit
Oil pump bend
in suction pipe to
outdoor unit
1 x every 2.5
metres of rising
pipe
Radius:
min. 50 mm
max. 15 m
Indoor unit
MVT 600 DC MVT 900 DC-
1050 DC
A 100 mm 200 mm
B 1,200 mm 1,500 mm
C 600 mm 600 mm
D 150 mm 150 mm
E 600 mm 500 mm
4. To bend the copper tubing, use
the appropriate bending tool to
prevent kinks in the tubing.
5. Lay the refrigerant pipes from
the indoor unit to the outdoor
unit.
In doing so, ensure adequate
fastenings and and take
measures for the oil return!
6. Use the wall or floor brackets
to fit the outdoor unit against
structural parts approved to
support the static load.
Observe the installation
instructions for the brackets.
7. Ensure that structure-borne
sound is not transferred to parts
of the building.
Use vibration dampers to
reduce the effects of structure-
borne sound!
8. Remove the factory-fitted
protective caps and union nuts
on the stop valve connections.
These should be used during
installation.
9. Before flanging the refrigerant
pipes, ensure that the union nut
is fitted on the pipe.
10.Prepare the laid refrigerant
pipes.
(Page 12, figures 5+6) .
11. Verify that the shape of the
flange is correct
( Page 12, figure 7).
E
DC
AAir outlet
Air intake
B
REMKO MVT
14

Use only tools which are
approved for use in an HVAC
environment.
Bending pliers, pipe cutter,
deburrer and flanging tool.
NOTE
Flanging tool
6 Flanging the refrigerant pipe
Refrigerant pipe
Deburrer
5 Deburring the refrigerant pipe 7 Correct flange shape
Check the connected injection
and suction pipes for correct
affiliation. Observe the letters
on the labels!
The connections of the
individual circuits may not be
mixed up.
CAUTION
12. First connect and hand-tighten
the refrigerant connections
to ensure they are correctly
seated.
13. Now fully tighten the fittings
using 2 suitably sized open-
ended spanners.
Use one spanner to counter
the force when tightening the
fitting (Figure 8).
14. Fit appropriate heat insulation
to both installed refrigerant
pipes, including the connectors.
15. Only use insulation hoses
which are designed for this
temperature range and
diffusion tight.
16.Proceed as described above for
all of the subsequent refrigerant
connections to the stop valves.
Always observe the labelling
and circuit affiliation of the
injection and suction pipes!
Supplementary information
for Installation
■ When combining the outdoor
unit with indoor unit MXW
350, the connection of the
refrigerant pipes differs.
In this case, install the
expansion fittings to the
outdoor unit provided in the
outdoor unit's scope of delivery.
■ If the basic length of the
connection pipe exceeds
5 m, add refrigerant when
commissioning the system for
the first time.
(See chapter „Add
refrigerant“).
Tighten 1. spanner
Counter
2. spanner
8 Tighten the fitting
Tightening
torque:
14“
15-20 Nm
38“
32-40 Nm
12“
50-60 Nm
58“
65-75 Nm
34“
95-105 Nm
Tightness check
Once all the connections have
been established, the pressure
gauge station is attached as
follows to the Schrader valve (if
fitted):
red = small valve
= injection pressure
blue = large valve
= suction pressure.
Once connected, perform a
tightness test using dried nitrogen.
The tightness test involves
spraying a leak detection spray
onto the connections. If bubbles
are visible, the connections have
not been properly made.
Re-tighten the connection or
prepare a new flange.
If the tightness test is successfully
completed, depressurise the
refrigerant pipes and start
a vacuum pump with an absolute
final partial pressure of min.
10 mbar to remove the air in the
pipe. Any humidity present in the
pipes is also removed.
15

Electrical connection
For devices of series MVT 600-
1050 DC, an electrical supply
must be laid as mains supply to
the outdoor unit as well as the
supplied 4-core control line from
the indoor unit to the outdoor
unit.
We recommend that screened
control lines are used with
a minimum cross-section of
1.5 mm².
Connecting the outdoor unit
Before making the connection,
observe the following information:
■ Customers should install
a terminal box in the vicinity of
the outdoor unit.
We recommend that a main/
repair switch is used (Figure 9).
■ Voltage is supplied to the
indoor unit through the
connection cable between
the outdoor component and
outdoor unit.
■ Details concerning the electrical
protection of the system are
given in the technical data.
Observe the required
diameters!
■ If the outdoor unit is installed
on a roof, ensure it is protected
against lightning strikes.
■ Label the electrical control lines
and the associated refrigerant
pipes of each interior device
with the same letter (A to D).
9 Connecting the outdoor unit
A vacuum of min. 20 mbar
must be created!
CAUTION
The time required to generate
the vacuum is dependent on
the pipework volume of the
indoor unit and the length of the
refrigerant pipes. This always takes
at least 60 minutes.
Once any foreign gases and
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 chapter on
"Commissioning".
All electrical installation
work should be performed
by specialist contractors.
Isolate the voltage supply
when connecting the electrical
terminals.
CAUTION
10 Connecting the cable
Strain relief
Plug control
line indoor
unit A
Plug control
line indoor
unit C
Plug control
line indoor
unit B
Terminal block
Mains cable
■ Only connect the lines to their
associated connections as
labelled with the same letter.
Mixing up the assignment
of control lines and
refrigeration pipes can lead
to fatal consequences such as
compressor damage!
Proceed as follows to connect the
cable:
1. Remove the side panel next to
the terminals.
2. Select the cable cross-section
according to the relevant
standards.
3. Feed the cables through the
edge protection rings on the
fixed connection panel.
4. Insert the control lines into
the corresponding sockets. In
doing so, pay attention to the
alignment of the circuits.
5. If the supplied control lines
are too short, they can be
unclamped from the indoor unit
and extended by an electrician.
6. Support the cable in the strain
relief and re-assemble the unit.
Check all plugged and clamped
terminals to verify they are
seated correctly and making
a permanent contact. Re-tight-
en as required.
CAUTION
Additional sensor and control
lines may be required on some
indoor units.
NOTE
REMKO MVT
16

Electrical circuit diagram
MVT 600 DC
MVT 900 DC
Liquefier sensor
Liquefier sensor
Electronic
expansion valve
Electronic
expansion valve
A
A
B
B
C
Compressor
Compressor
Sensor
Suction pipe Sensor
Suction pipe
A AB BC C
Control board
Control board
Trans
former
Trans
former
Trans
former
Trans
former
Sensor
Sensor
Sensor suction pipe
Sensor suction pipe
Heating
Heating
Fan motor
Fan motor
Power board
Power board
Line filter
Line filter
Power output
230V/1~/50Hz
Power output
230V/1~/50Hz
Indoor unit C
Indoor unit B
Indoor unit B
Indoor unit A
Indoor unit A
Inverter
valve
Inverter
valve
17

P-3
CN 24
31
N
C
A
B
C
D
CN2 CN3
CN1
CN8
CN11
CN12
CN15
CN18
CN5
CN4 CN30 CN6
CN7
CN9
CN10
JXI
H EAT
4- WAY
FAN -H
F AN-L
CN17
CN19
CN20
CN25
CN26
CN27
CN28
CN16
CN32
CN60
Y/G
XS3
XS4
XS5
XS6
T -B
T-C
T-A
T-D
CN33
CN34
T5
H-P RO
L-P RO
P1 N1
P-4
Electrical circuit diagram
MVT 950 DC
Electronic
expansion valve
ABCD
Compressor
Line filter
C
B
A
D
Indoor units
Heating
Fan motor
Power output
230V/1~/50Hz
Inverter
valve
Power board
Sensor
Suction pipe
High pressure
switch
Low pressure
switch
Sensor
MVT 1050 DC
L N
.
2
4
ABCD
Oil sump heating
PFC module
C
B
A
D
CN1
CN5
CN12
R- + C
P4-
CN13 CN18 CN15 CN21
CN24
CN27
CN29
CN31
CN34
CN34
CN28 CN26 CN25 CN23
P2+
P1+
P3-
CN202
Compressor
Electronic
expansion valve
Power board
Indoor units
Fan motor
Power output
230V/1~/50Hz
Inverter
valve
Sensor
Suction pipe
REMKO MVT
18

Electrical connection diagram
MVT 600 DC
Mains cable
230 V, 1~,
50 Hz,
L1 / N / PE
N
L
N
L1
Indoor unit
Circuit A
Indoor unit
Circuit B
Plug
Outdoor unit
Circuit A
Plug
Outdoor unit
Circuit B
Neutral conductor black
Phase conductor brown
Earth conductor
Control conductor blue
PE
PE
N
S
N
L
L
S
Neutral conductor black
Phase conductor brown
Earth conductor
Control conductor blue
PE
PE
N
S
N
L
L
S
Terminal
block outdoor
unit
Neutral conductor black
Phase conductor brown
Earth conductor
Control conductor blue
PE
PE
N
S
N
L
L
S
Neutral conductor black
Phase conductor brown
Earth conductor
Control conductor blue
PE
PE
N
S
N
L
L
S
Neutral conductor black
Phase conductor brown
Earth conductor
Control conductor blue
PE
PE
N
S
N
L
L
S
Mains cable
230 V, 1~,
50 Hz,
L1 / N / PE
N
L
N
L1
MVT 900 DC
Indoor unit
Circuit A
Plug
Outdoor unit
Circuit A
Indoor unit
Circuit B
Indoor unit
Circuit C
Plug
Outdoor unit
Circuit B
Plug
Outdoor unit
Circuit C
Terminal
block outdoor
unit
Neutral conductor black
Phase conductor brown
Earth conductor
Control conductor blue
PE
PE
N
S
N
L
L
S
Neutral conductor black
Phase conductor brown
Earth conductor
Control conductor blue
PE
PE
N
S
N
L
L
S
Neutral conductor black
Phase conductor brown
Earth conductor
Control conductor blue
PE
PE
N
S
N
L
L
S
Neutral conductor black
Phase conductor brown
Earth conductor
Control conductor blue
PE
PE
N
S
N
L
L
S
MVT 950 - 1050 DC
Mains cable
230 V, 1~,
50 Hz,
L1 / N / PE
N
L
N
L1
Indoor unit
Circuit A
Plug
Outdoor unit
Circuit A
Indoor unit
Circuit B
Indoor unit
Circuit C
Plug
Outdoor unit
Circuit B
Plug
Outdoor unit
Circuit C
Terminal
block outdoor
unit
Indoor unit
Circuit D
Plug
Outdoor unit
Circuit D
19

Before commissioning
After the tightness check has
been successfully completed,
connect the vacuum pump via the
pressure gauge station to the valve
connections on the outdoor unit
(see chapter "Tightness check")
and create a vacuum.
Perform the following checks
prior to commissioning the
unit for the first time and after
any interventions affecting the
refrigerant circuit. Record the
results in the commissioning
report:
■ Check of all refrigerant pipes
and valves with leak detection
spray or soapy water for leaks
and for inadvertent mix up of
suction and injection pipe, with
the unit at a standstill.
■ Check of all refrigerant pipes
and insulation for damage.
■ Check of all electrical
connections between indoor
unit and outdoor unit for
correct polarity.
■ Check that all fastenings,
mountings etc. are firm and at
the correct level.
Commissioning
Commissioning should only be
performed and documented by
specially trained personnel.
Observe the manuals for the
indoor unit and outdoor unit
when commissioning the
entire system.
NOTE
The system can be commissioned
once all the components have
been connected and checked.
A functional check should be
performed to verify its correct
function and identify any unusual
operational behaviour prior to
handing it over to the operator.
This check is dependent on the
installed indoor unit.
The procedures are specified in the
manual for the indoor unit being
commissioned.
Add refrigerant
The unit contains a basic quantity
of refrigerant.
In addition, an additional amount
of refrigerant must be added for
refrigerant pipe lengths exceeding
5 meters per circuit. Refer to the
following chart:
Note that the employed
refrigerant is always filled in
liquid form!
CAUTION
NOTE
Check the overheating to
determine the refrigerant fill
quantity.
Wear protective clothing when
handling refrigerant.
CAUTION
MVT
600 DC - 1050 DC
Basic pipe length Additional
filling quantity
Up to and incl.
5 m 0 g/m 0 g/m
5 m to max. 15 m
per circuit
30 g/m 30 g/m
Condensate connection
and safe drainage
Condensate connection
If the temperature falls below the
dew point, condensation will form
on the finned condenser during
heating mode.
Below the register is a collection
tray, which must be connected to
a drain.
■ The condensate line should
have a fall of min. 2 %.
This is the responsibility of the
customer.
If necessary, fit vapour diffusion
proof insulation.
■ When operating the unit at
outdoor temperatures below 4 °C,
make sure to route the condensate
line so that freezing is prevented.
The lower part of the housing
must also be kept frost free by the
user, in order to ensure permanent
draining of the condensate.
If necessary, fit a pipe heater.
■ After installation is complete,
check for unobstructed
condensation run off and
ensure that a permanent seal is
provided.
Safe drainage in the event of
leakage
Local regulations or environmental
laws, for example the German Water
Resource Act (WHG), can require
suitable precautions to protect
against uncontrolled drainage in
case of leakage to provide for safe
disposal of escaping air conditioning
fluid or hazardous media .
REMKO MVT
20