REMKO SKT 521 User manual

Operating and
installation instructions
Read the instructions prior to performing any task!
REMKO SKT series
SKT 521, SKT 791, SKT 1061
Multisplit air-conditioning systems for cooling and heating
0243-2019-12 Edition 1, en_GB
Outdoor units

R32
Refrigerant
Translation of the original
Read these operating instructions carefully before commis-
sioning / using this device!
These instructions are an integral part of the system and must
always be kept near or on the device.
Subject to modifications; No liability accepted for errors or mis-
prints!

Table of contents
1 Safety and usage instructions............................................................................................................. 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............................................................................................................................. 11
2.3 Performance curves for heating and cooling ................................................................................ 12
3 Design and function............................................................................................................................ 15
3.1 Unit description............................................................................................................................. 15
3.2 Combinations................................................................................................................................ 17
4 Operation............................................................................................................................................. 17
5Installation instructions for qualified personnel.............................................................................. 18
5.1 Important notes prior to installation............................................................................................... 18
5.2 Wall openings................................................................................................................................ 19
5.3 Installation materials..................................................................................................................... 19
5.4 Selection of installation location ................................................................................................... 19
5.5 Minimum clearances..................................................................................................................... 21
5.6 Oil return measures....................................................................................................................... 21
6 Installation........................................................................................................................................... 22
6.1 Connection of refrigerant piping.................................................................................................... 22
6.2 Leak testing................................................................................................................................... 24
6.3 Additional notes on connecting the refrigerant piping................................................................... 24
6.4 Adding refrigerant.......................................................................................................................... 25
7 Condensate drainage connection and safe drainage...................................................................... 25
8 Electrical wiring................................................................................................................................... 26
8.1 General connection and safety instructions.................................................................................. 26
8.2 Outdoor unit connection................................................................................................................ 26
8.3 Electrical wiring diagram............................................................................................................... 28
8.4 Electrical drawings........................................................................................................................ 29
9 Before commissioning....................................................................................................................... 32
10 Commissioning................................................................................................................................... 32
11 Troubleshooting, fault analysis and customer service................................................................... 37
11.1 Troubleshooting and customer service........................................................................................ 37
11.2 Outdoor unit error analysis.......................................................................................................... 39
11.3 Resistances of the temperature probes...................................................................................... 51
3

12 Care and maintenance........................................................................................................................ 54
13 Shutdown............................................................................................................................................. 55
14 Exploded view and spare parts lists................................................................................................. 56
14.1 Exploded view of the unit SKT 521 AT........................................................................................ 56
14.2 Spare parts list for SKT 521 AT................................................................................................... 57
14.3 Exploded view of the unit SKT 791 AT........................................................................................ 58
14.4 Spare parts list for SKT 791 AT................................................................................................... 59
14.5 Exploded view of the unit SKT 1061 AT...................................................................................... 60
14.6 Spare parts list for SKT 1061 AT................................................................................................. 61
15 Index..................................................................................................................................................... 62
REMKO SKT series
4

1 Safety and
usage instructions
1.1 General safety notes
Carefully read the operating manual before com-
missioning 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 the directions in this
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 data-
sheet) in the vicinity of the unit.
The refrigerant used in the system is flammable. If
applicable, observe the local safety conditions.
Warning of inflammable substances!
1.2 Identification of notes
This section provides an overview of all important
safety aspects for proper protection of people and
safe and fault-free operation.The instructions and
safety notes contained within this manual must be
observed in order to prevent accidents, personal
injury and material damage.
Notes attached directly to the units must be
observed in their entirety and be kept in a fully
legible condition.
Safety notes in this manual are indicated by sym-
bols. Safety notes are introduced with signal words
which help to highlight the magnitude of the danger
in question.
DANGER!
Contact with live parts poses an immediate
danger of death due to electric shock. Damage
to the insulation or individual components may
pose a danger of death.
DANGER!
This combination of symbol and signal word
warns of a situation in which there is immediate
danger, which if not avoided may be fatal or
cause serious injury.
WARNING!
This combination of symbol and signal word
warns of a potentially hazardous situation,
which if not avoided may be fatal or cause
serious injury.
CAUTION!
This combination of symbol and signal word
warns of a potentially hazardous situation,
which if not avoided may cause injury or mate-
rial and environmental damage.
NOTICE!
This combination of symbol and signal word
warns of a potentially hazardous situation,
which if not avoided may cause material and
environmental damage.
This symbol highlights useful tips and recom-
mendations as well as information for efficient
and fault-free operation.
1.3 Personnel qualifications
Personnel responsible for commissioning, opera-
tion, maintenance, inspection and installation must
be able to demonstrate that they hold a qualifica-
tion which proves their ability to undertake the
work.
1.4 Dangers of failure to observe
the safety notes
Failure to observe the safety notes may pose a risk
to people, the environment and the units. Failure to
observe the safety notes may void any claims for
damages.
5

In particular, failure to observe the safety notes
may pose the following risks:
nThe failure of important unit functions.
nThe failure of prescribed methods of mainte-
nance and repair.
nDanger to people on account of electrical and
mechanical effects.
1.5 Safety-conscious working
The safety notes contained in this manual, the
existing national regulations concerning accident
prevention as well as any internal company
working, operating and safety regulations must be
observed.
1.6 Safety instructions
for the operator
The operational safety of the units and compo-
nents is only assured providing they are used as
intended and in a fully assembled state.
nThe units and components may only be set up,
installed and maintained by qualified per-
sonnel.
nProtective covers (grills) over moving parts
must not be removed from units that are in
operation.
nDo not operate units or components with
obvious defects or signs of damage.
nContact with equipment parts or components
can lead to burns or injury.
nThe units and components must not be
exposed to any mechanical load, extreme
levels of humidity or extreme temperatures.
nRooms in which refrigerant may escape shall
be adequately aerated and ventilated. Other-
wise, a risk of suffocation or fire exists.
nDo not leave children unsupervised when close
to the system.
nCommissioning must be performed by author-
ised specialists exclusively. Deficient commis-
sioning may lead to water leaks, electric
shocks or fire. Commissioning must take place
as described in the user manual.
nOnly instruct authorised specialist personnel to
perform maintenance or servicing.
nThe system is filled with a flammable refrig-
erant. Never thaw any frozen unit components
independently!
nDo not operate any further devices that pro-
duce high heat or naked flames in the same
room.
nAll housing parts and unit openings, e.g. air
inlets and outlets, must be kept clear.
nThe 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
nThe refrigerant R32 used in the system is flam-
mable. If applicable, observe the local safety
conditions.
nKeep the cooling circuit clear of other gases
and foreign substances. Only fill the cooling cir-
cuit with the refrigerant R32.
nOnly use the accessories, components and
appropriately marked parts provided. The use
of non-standardised components may result in
water leaks, electric shocks and fire.
nOnly install and store the units in rooms larger
than 4 m2. With a failure to comply, leaks may
result in the room filling with a flammable mix-
ture!
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.
nOnly mount the unit components on structurally
suitable brickwork.
nThe units must not be installed in rooms in
which further devices that produce heat are
operated (heaters, open hearths).
nMake sure the installation room is sufficiently
ventilated.
nInterventions in the cooling circuit are only pos-
sible after completely draining the refrigerant.
Never solder or grind unit components!
nNote that refrigerant may be odourless.
nNever 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.
nThe product must be correctly earthed at all
times, otherwise it may induce electric shocks.
nAttach the condensate drain as described in
the operating manual. The inadequate
drainage of condensate can lead to water
damage in your apartment.
nAll 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.
REMKO SKT series
6

nAppropriate hazard prevention measures must
be taken to prevent risks to people when per-
forming installation, repair, maintenance or
cleaning work on the units.
nThe setup, connection and operation of the
units and its components must be undertaken
in accordance with the usage and operating
conditions stipulated in this manual and comply
with all applicable regional regulations.
nRegional regulations and laws as well as the
Water Ecology Act must be observed.
nThe power supply should be adapted to the
requirements of the units.
nUnits may only be mounted at the points pro-
vided for this purpose at the factory. The units
may only be secured or mounted on stable
structures, walls or floors.
nThe units and components should not be oper-
ated in areas where there is a heightened risk
of damage. Observe the minimum clearances.
nThe units and components must be kept at an
adequate distance from flammable, explosive,
combustible, abrasive and dirty areas or
atmospheres.
nSafety devices may not be modified or
bypassed.
nThe connection of the indoor unit must be
established as a permanent connection; a
detachable, reusable connection is not permis-
sible.
1.8 Unauthorised modification
and changes
Modifications or changes to units and components
are not permitted and may cause malfunctions.
Safety devices may not be modified or bypassed.
Original replacement parts and accessories
authorised by the manufactured ensure safety. The
use of other parts may invalidate liability for
resulting consequences.
1.9 Intended use
Depending on the model, the units and the addi-
tional fittings with which they are equipped are only
intended to be used as an air-conditioner for the
purpose of cooling or heating the air in an
enclosed space.
Any different or additional use is a non-intended
use. The manufacturer/supplier assumes no lia-
bility for damages arising from a non-intended use.
The user bears the sole risk in such cases.
Intended use also includes working in accordance
with the operating and installation instructions and
complying with the maintenance requirements.
The threshold values specified in the technical
data must not be exceeded.
1.10 Warranty
For warranty claims to be considered, it is essential
that the ordering party or its representative com-
plete and return the "certificate of warranty" to
REMKO GmbH & Co. KG at the time when the
units are purchased and commissioned.
The warranty conditions are detailed in the "Gen-
eral business and delivery conditions". Further-
more, only the parties to a contract can conclude
special agreements beyond these conditions. In
this case, contact your contractual partner in the
first instance.
1.11 Transport and packaging
The devices are supplied in a sturdy shipping con-
tainer. Please check the equipment immediately
upon delivery and note any damage or missing
parts on the delivery and inform the shipper and
your contractual partner. For later complaints can
not be guaranteed.
WARNING!
Plastic films and bags etc. are dangerous
toys for children!
Why:
- Leave packaging material are not around.
- Packaging material may not be accessible to
children!
7

1.12 Environmental protection
and recycling
Disposal of packaging
All products are packed for transport in environ-
mentally friendly materials. Make a valuable contri-
bution to reducing waste and sustaining raw mate-
rials. Only dispose of packaging at approved
collection points.
Disposal of equipment and components
Only recyclable materials are used in the manufac-
ture of the devices and components. Help protect
the environment by ensuring that the devices or
components (for example batteries) are not dis-
posed in household waste, but only in accordance
with local regulations and in an environmentally
safe manner, e.g. using certified firms and recy-
cling specialists or at collection points.
REMKO SKT series
8

2 Technical data
2.1 Unit data
Series SKT 521 AT SKT 791 AT SKT 1061 AT
Operating mode Inverter multisplit outdoor units for cooling and
heating
Nominal cooling output 1) kW 5,3 a)
(2,1-6,9)
7,9 b)
(2,9-8,5)
10,5 c)
(2,1-10,6)
Energy efficiency ratio SEER 6,1 a) 6,1 b) 6,5 c)
Power consumption, annual, QCE 3) kWh 304 a) 453 b) 565 c)
Energy efficiency ratio - cooling A++ a) A++ b) A++ c)
Nominal heat capacity 2) kW 4,3 a)
(2,3-7,2)
5,7 b)
(2,0-8,5)
8,9 c)
(2,3-11,1)
Energy efficiency ratio SCOP 4) 4,0 a) 4,0 b) 4,0 c)
Power consumption, annual, QHE 3) 4) kWh 1537 1993 3226
Energy efficiency ratio - heating A+
Power supply V/
Ph/Hz 230/1~/50
Electr. rated power consumption, cooling 1) kW 1,63 2,45 3,50
Electrical rated power consumption,
heating 2) kW 1,50 2,10 3,00
Elec. power consumption, max. kW 2,85 3,60 4,50
Electrical rated current consumption,
cooling 1) A7,1 13,7 16,8
Electrical rated current consumption,
heating 2) A6,6 12,5 15,0
Elec. current consumption, max. A 13 17,5 21,5
Refrigerant connection, injection pipe Inches
(mm) 1/4 (6,35)
Refrigerant connection, suction pipe Inches
(mm) 3,8 (9,52) 3 x 3/8 + 1 x 1/2 (9,52+12,70)
Operating pressure, max. kPa 4300/1700
Operating range, cooling °C -15 to +50
Operating range, heating °C -15 to +24
Air flow rate, max. m3/h 2200 2700 4000
Enclosure class IP 24
Sound power level max. dB (A) 65 67 70
Sound pressure level 5) dB (A) 56 54 62
Refrigerant 6) R32
9

Series SKT 521 AT SKT 791 AT SKT 1061 AT
Refrigerant, basic quantity kg 1,25 1,72 2,10
CO2 equivalent t 0,84 1,16 1,42
Refrigerant, additional quantity >5 m g/m 30
Max. number of indoor units 2 3 4
Refrigerant piping, max. length per IU m 25 30 35
Refrigerant piping, max. total length m 40 60 80
Refrigerant piping, max. height, upper OU m 10
Refrigerant piping, max. height, bottom OU m 15
Dimensions
Height mm 554 702 810
Width mm 800 845 946
Depth mm 333 363 410
Weight kg 35,5 51,1 68,8
EDP 1641120 1641130 1641140
1) Air intake temperature TK 27 °C / FK 19 °C, outside temperature TK 35 °C, FK 24 °C, max. air flow
volume, 5 m pipe length
2) Air intake temperature 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
5) At a distance of 1 m in the open air: specified values are maximum values
6) Contains greenhouse gas per the Kyoto protocol, GWP 2088 (for further information, see "Adding refrig-
erant" chapter).
In conjunction with
a) 2 x SKT 261 IT
b) 3 x SKT 261 IT
c) 4 x SKT 261 IT
REMKO SKT series
10

2.2 Unit dimensions
A
B
C
D
E
Fig. 1: Dimensions
We reserve the right to modify the dimensions and design as part of the ongoing technical development
process.
A B C D E
SKT 521 800 554 333 514 340
SKT 791 845 702 363 540 350
SKT 1061 946 810 410 673 403
(All measurements in mm)
11

2.3 Performance curves for heating and cooling
Heating capacity SKT 521
0,00
0,50
1,00
1,50
2,00
2,50
3,00
3,50
4,00
4,50
5,00
5,50
6,00
6,50
-15 -7 -5 0 7 12
2
1
3
A[°C]
Fig. 2: Performance curves, heating SKT 521 (data for room temperature 20 °C)
A: Outside temperature
1: COP
2: Heating capacity in kW
3: Power consumption in kW
Outside temperature in °C -15 -7 -5 0 7 12
Heating capacity in kW 3.04 3.21 3.46 4.05 5.57 6.34
Power consumption in kW 1.30 1.32 1.35 1.41 1.54 1.57
COP 2.33 2.43 2.56 2.88 3.61 4.04
Cooling capacity SKT 521
0,00
0,50
1,00
1,50
2,00
2,50
3,00
3,50
4,00
4,50
5,00
5,50
6,00
6,50
21 25 30 35 40
2
1
3
A[°C]
Fig. 3: Performance curves, cooling SKT 521 (data for room temperature FK 27°C/TK 19 °C)
A: Outside temperature
1: EER
2: Cooling capacity in kW
3: Power consumption in kW
Outside temperature in °C 21 25 30 35 40
Cooling capacity in kW 5.10 5.44 5.48 5.28 4.53
Power consumption in kW 1.36 1.47 1.60 1.75 1.78
EER 3.74 3.70 3.42 3.02 2.55
REMKO SKT series
12

Heating capacity SKT 791
0,00
0,50
1,00
1,50
2,00
2,50
3,00
3,50
4,00
4,50
5,00
5,50
6,00
6,50
7,00
7,50
8,00
8,50
9,00
9,50
10,00
-15 -7 -5 0 7 12
2
1
3
A[°C]
Fig. 4: Performance curves, heating SKT 791 (data for room temperature 20 °C)
A: Outside temperature
1: COP
2: Heating capacity in kW
3: Power consumption in kW
Outside temperature in °C -15 -7 -5 0 7 12
Heating capacity in kW 4.48 4.73 5.10 5.97 8.21 9.34
Power consumption in kW 1.92 1.94 1.99 2.07 2.27 2.31
COP 2.34 2.43 2.56 2.88 3.61 4.05
Cooling capacity SKT 791
0,00
0,50
1,00
1,50
2,00
2,50
3,00
3,50
4,00
4,50
5,00
5,50
6,00
6,50
7,00
7,50
8,00
8,50
9,00
21 25 30 35 40
2
1
3
A[°C]
Fig. 5: Performance curves, cooling SKT 791 (data for room temperature FK 27 °C/TK19 °C)
A: Outside temperature
1: EER
2: Cooling capacity in kW
3: Power consumption in kW
Outside temperature in °C 21 25 30 35 40
Cooling capacity in kW 7.64 8.14 8.22 7.91 6.79
Power consumption in kW 1.92 2.07 2.26 2.47 2.50
EER 3.98 3.93 3.64 3.21 2.71
13

Heating capacity SKT 1061
0,00
0,50
1,00
1,50
2,00
2,50
3,00
3,50
4,00
4,50
5,00
5,50
6,00
6,50
7,00
7,50
8,00
8,50
9,00
9,50
10,00
10,50
11,00
11,50
12,00
12,50
13,00
13,50
-15 -7 -5 0 7 12
2
1
3
A[°C]
Fig. 6: Performance curves, heating SKT 1061 (data for room temperature 20 °C)
A: Outside temperature
1: COP
2: Heating capacity in kW
3: Power consumption in kW
Outside temperature in °C -15 -7 -5 0 7 12
Heating capacity in kW 6.08 6.42 6.92 8.10 11.14 12.68
Power consumption in kW 2.53 2.57 2.63 2.74 3.00 3.05
COP 2.40 2.50 2.64 2.96 3.71 4.16
Cooling capacity SKT 1061
0,00
0,50
1,00
1,50
2,00
2,50
3,00
3,50
4,00
4,50
5,00
5,50
6,00
6,50
7,00
7,50
8,00
8,50
9,00
9,50
10,00
10,50
11,00
11,50
12,00
21 25 30 35 40
2
1
3
A[°C]
Fig. 7: Performance curves, cooling SKT 1061 (data for room temperature FK 27 °C/TK 19 °C)
A: Outside temperature
1: EER
2: Cooling capacity in kW
3: Power consumption in kW
Outside temperature in °C 21 25 30 35 40
Cooling capacity in kW 10.19 10.86 10.96 10.55 9.05
Power consumption in kW 3.03 3.27 3.56 3.89 3.95
EER 3.36 3.32 3.08 2.71 2.29
REMKO SKT series
14

3 Design and function
3.1 Unit description
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 com-
pressor precisely matches requirements, and
thereby regulates the nominal temperature with
minimal temperature deviations. This "inverter
technology" results in energy savings over conven-
tional split systems and also reduces noise emis-
sions 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 indoor unit is designed to be mounted high up
on the wall, in indoor areas. It is operated by an
infrared remote control. The outdoor unit consists
of a cycle with a compressor, fin condenser, three
electronic expansion valves and a condenser fan.
The outdoor unit can be combined with REMKO
indoor units from the series SKT 261 IT that pro-
vide sufficient cooling capacity. The outdoor unit
cooling cycle is controlled by the controller of the
indoor unit. In order to enable operation of the unit
at low outside temperatures, a thermal condenser
pressure regulator serves as winter fan speed con-
trol to regulate the speed of the condenser fan.
Floor consoles, wall consoles and refrigerant pipes
are available as accessories.
TCE
TCE
TCE
2
1
4
3
5
8
9
10
11
6
7
TCE
12
13
Fig. 8: Cooling cycle schematic
1: Condenser
2: Condenser fan
3: Reversing valve
4: Compressor
5: Capillary tube throttle element
6: Suction pipe connection valve A
7: Suction pipe connection valve B
8: Suction pipe connection valve C
9: Suction pipe connection valve D
10: Injection pipe A
11: Injection pipe B
12: Injection pipe C
13: Injection pipe D
15

Ba
A
Bb
Bc Bd
2
4
5
6
7
8
9
7
8
9
1a 1b
1c 1d
3
3
33
Fig. 9: System layout SKT 1061 AT
A: Outdoor area
Ba-d: Indoor area
1a-d: Indoor units
2: Outdoor unit
3: Condensate drainage line
4: Condenser fan
5: Power supply
6: Shut-off valves
7: Suction pipes
8: Injection pipes
9: Control lines
The connection between the indoor unit (indoor areas Ba, Bb, Bc, Bd, Be) and
the outdoor unit (connection circuits A, B, C, D, E) of the outdoor unit is established using refrigerant piping
and a control line.
REMKO SKT series
16

3.2 Combinations
Indoor unit
The IT SKT 261 indoor unit can be combined with
the AT SKT 521-1061 outdoor units.
Fig. 10: Indoor unit
The following combinations of outdoor units can be
selected:
SKT 521 - Combination with 2 indoor units
Combination
Indoor units
2.6 kW
1ll
For more, see the next page.
SKT 791 - Combination with 3 indoor units
Combination
Indoor units
2.6 kW
1lll
SKT 1061 - Combination with 4 indoor units
Combination
Indoor units
2.6 kW
1llll
4 Operation
The compressor in the outdoor unit is operated by
means of regulating the control board in the out-
door unit. The chapter on "Regulation" in the
manual for the outdoor unit must therefore be
observed.
Help save on energy consumption in stand-by
mode! If the device, system or component is not
in use, we recommend disconnecting the power
supply. Components with a safety function is
excluded from our recommendation!
17

5 Installation instructions
for qualified personnel
5.1 Important notes prior
to installation
Label the refrigerant piping (injection and suc-
tion pipes) as well as the associated electrical
control lines of each interior unit with a letter.
Only connect the lines to their associated con-
nections.
nObserve the operating manuals for the indoor
unit and the outdoor unit when installing the
entire system.
nTransport the unit in its original packaging as
close as possible to the installation location.
You avoid transport damage by doing so.
nCheck the contents of the packaging for com-
pleteness and check the unit for visible trans-
port damage. Report any damage immediately
to your contractual partner and the shipping
company.
nLift the unit on the corners and not on the
refrigerant or condensate drainage connec-
tions.
nThe refrigerant piping (injection and suction
pipe), valves and connections must be insu-
lated against vapour density. If necessary also
insulate the condensate drainage line.
nSelect an installation location which allows air
to freely flow through the air inlet and outlet
(see section "Minimum clearances").
nDo not install the unit in the immediate vicinity
of devices which generate intensive thermal
radiation. Installation in the vicinity of thermal
radiation reduces the unit output.
nOnly open the shut-off valves on the refrigerant
piping after installation is complete.
nSeal off open refrigerant piping with suitable
caps or adhesive strips to prevent the infiltra-
tion of moisture and never kink or compress
the refrigerant piping.
nAvoid unnecessary bends. This minimises the
pressure loss in the refrigerant piping and
ensures that the compressor oil can flow back
without obstruction.
nMake special preparations regarding the oil
return if the outdoor unit is located above the
indoor unit (see the "Oil return measures" sec-
tion).
nAdd refrigerant if the basic length of the refrig-
erant piping exceeds 5 metres. For the quantity
of additional refrigerant, refer to the "Adding
refrigerant" chapter.
nOnly use the union nuts supplied with the
refrigerant piping. These should only be
removed shortly before connecting the refrig-
erant piping.
nCarry out all electrical wiring in accordance
with applicable DIN and VDE standards.
nEnsure the electrical cables are properly con-
nected to the terminals. Otherwise there is a
risk of fire.
NOTICE!
Always pay attention to the affiliation of the
electrical lines and refrigerant piping! The con-
nections of the individual circuits must not be
mixed up. Mixing up the assignment of control
lines and refrigerant piping can have fatal con-
sequences (compressor damage)!
Commissioning of the individual circuits must
be carried out successively.
NOTICE!
Different refrigerant pipes are required
depending on the cooling capacity of the out-
door unit and the indoor unit.
REMKO SKT series
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5.2 Wall openings
nA wall opening of at least 70mm diameter and
10mm incline from the inside to the outside
must be created.
nTo prevent damage to the lines, the interior of
the wall opening should be padded or, for
example, lined with PVC pipe (see figure).
nAfter installation has been completed, use a
suitable sealing compound to close off the wall
opening, taking account of fire protection regu-
lations (responsibility of customer). Do not use
cement or lime containing substances!
21 5
3 4
Fig. 11: Wall opening
1: Liquid line
2: Control line
3: Condensate drainage line
4: Suction pipe
5: PVC pipe
5.3 Installation materials
The outdoor unit is attached by 4 screws and a
wall bracket to the wall or fixed by a floor bracket to
the ground.
WARNING!
Only fasteners suitable for the given application
may be used.
5.4 Selection of installation
location
Indoor unit
The indoor unit is designed for horizontal wall
installation above doors. However, it can also be
used in the upper wall area (min. 1.75m above the
floor).
Outdoor unit
The outdoor unit is designed for horizontal installa-
tion 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. The
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 temper-
ature 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 cus-
tomer). One possible solution is to build a small
roofed area over the unit. These measures should
not affect the flow of warm outlet air.
19

Wind
If the unit is being installed in windy areas, ensure
that the warm outlet air is discharged in the pre-
vailing wind direction. If this is not the possible, it
may be necessary to install a windbreak (to be pro-
vided by the customer). Ensure that the windbreak
does not adversely affect the air intake to the unit.
An additional stabilization is recommended. This
can, for example, be realized with ropes or other
structures.
1
Fig. 12: 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.
20 cm
1
Fig. 13: Minimum clearance to snow
1: Snow
Installation inside buildings
nEnsure that heat can dissipate adequately
when placing the outdoor unit in cellars, lofts,
adjoining rooms or halls (Fig. 14).
nInstall an additional fan with a rated flow com-
parative to that of the outdoor unit being
installed in the room and which can compen-
sate any additional pressure loss in ventilation
ducts (Fig. 14).
nComply with any regulations and conditions
affecting the statics of the building. If neces-
sary, fit acoustic installation.
2
1
K
3
W3
Fig. 14: Installation inside buildings
K: Cold fresh air / W: Warm air
1: Outdoor unit / 2: Additional fan
3: Air shaft
REMKO SKT series
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