REMKO SKT Series, SKT 520 AT, SKT 790 AT, SKT 1060 AT Assembly And Operating Instructions Manual
Assembly and operating instructions
REMKO series SKT
Multisplit outdoor unit
SKT 520, SKT 790, SKT 1060
0175-2018-09 Edition 1, en_GB
Read the instructions prior to performing any task!
Read these operating instructions carefully before commissioning / using this device!
These instructions are an integral part of the system and must
always be kept near or on the device.
Subject to modifications; No liability accepted for errors or misprints!
Installation and operating instructions (translation of the original)
Table of contents
1 Safety and usage instructions............................................................................................................. 5
1.1 General safety notes....................................................................................................................... 5
1.2 Identification of notes...................................................................................................................... 5
1.3 Personnel qualifications.................................................................................................................. 5
1.4 Dangers of failure to observe the safety notes................................................................................ 5
1.5 Safety-conscious working............................................................................................................... 5
1.6 Safety notes for the operator........................................................................................................... 6
1.7 Safety notes for installation, maintenance and inspection.............................................................. 6
1.8 Unauthorised modification and changes......................................................................................... 6
1.9 Intended use................................................................................................................................... 6
1.10 Warranty........................................................................................................................................ 6
1.11 Transport and packaging............................................................................................................... 7
1.12 Environmental protection and recycling........................................................................................ 7
2 Technical data........................................................................................................................................ 8
2.1 Unit data.......................................................................................................................................... 8
2.2 Unit dimensions............................................................................................................................. 10
2.3 Performance curves for heating and cooling ................................................................................ 11
3 Design and function............................................................................................................................ 14
3.1 Unit description............................................................................................................................. 14
3.2 Combinations................................................................................................................................ 16
4 Operation............................................................................................................................................. 16
5
Installation instructions for qualified personnel.............................................................................. 17
5.1 Important notes prior to installation............................................................................................... 17
5.2 Wall openings................................................................................................................................ 18
5.3 Installation materials..................................................................................................................... 18
5.4 Selection of installation location ................................................................................................... 18
5.5 Minimum clearances..................................................................................................................... 20
5.6 Oil return measures....................................................................................................................... 20
6 Installation........................................................................................................................................... 21
6.1 Connection of refrigerant piping.................................................................................................... 21
6.2 Leak testing................................................................................................................................... 23
6.3 Additional notes on connecting the refrigerant piping................................................................... 23
6.4 Adding refrigerant.......................................................................................................................... 24
7 Condensate drainage connection and safe drainage...................................................................... 24
8 Electrical wiring................................................................................................................................... 25
8.1 General connection and safety instructions.................................................................................. 25
8.2 Outdoor unit connection................................................................................................................ 25
8.3 Electrical wiring diagram............................................................................................................... 27
8.4 Electrical drawings........................................................................................................................ 28
9 Before commissioning....................................................................................................................... 31
10 Commissioning................................................................................................................................... 31
11 Troubleshooting, fault analysis and customer service................................................................... 36
11.1 Troubleshooting and customer service........................................................................................ 36
11.2 Outdoor unit error analysis.......................................................................................................... 38
12 Care and maintenance........................................................................................................................ 52
3
REMKO series SKT
13 Shutdown............................................................................................................................................. 53
14
Exploded view and spare parts lists................................................................................................. 54
14.1 Exploded view of the unit SKT 520 AT........................................................................................ 54
14.2 Spare parts list for SKT 520 AT................................................................................................... 55
14.3 Exploded view of the unit SKT 790 AT........................................................................................ 56
14.4 Spare parts list for SKT 790 AT................................................................................................... 57
14.5 Exploded view of the unit SKT 1060 AT...................................................................................... 58
14.6 Spare parts list for SKT 1060 AT................................................................................................. 59
15 Index..................................................................................................................................................... 60
4
1 Safety and
usage instructions
1.1 General safety notes
Carefully read the operating manual before commissioning the units for the first time. It contains
useful tips and notes such as hazard warnings to
prevent personal injury and material damage.
Failure to follow the directions in this manual not
only presents a danger to people, the environment
and the system itself, but will void any claims for
.
liability
Keep this operating manual and the refrigerant
data sheet near to the units.
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 symbols. Safety notes are introduced with signal words
which help to highlight the magnitude of the danger
in question.
DANGER!
CAUTION!
This combination of symbol and signal word
warns of a potentially hazardous situation,
which if not avoided may cause injury or material and environmental damage.
NOTICE!
This combination of symbol and signal word
warns of a potentially hazardous situation,
which if not avoided may cause material and
environmental damage.
This symbol highlights useful tips and recommendations as well as information for efficient
and fault-free operation.
1.3 Personnel qualifications
Personnel responsible for commissioning, operation, maintenance, inspection and installation must
be able to demonstrate that they hold a qualification which proves their ability to undertake the
work.
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
cause serious injury.
This combination of symbol and signal word
warns of a potentially hazardous situation,
which if not avoided may be fatal or cause
serious injury
, which if not avoided may be fatal or
WARNING!
.
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.
In particular, failure to observe the safety notes
may pose the following risks:
n The failure of important unit functions.
n The failure of prescribed methods of mainte-
nance and repair
n Danger to people on account of electrical and
mechanical effects.
.
1.5 Safety-conscious working
The safety notes contained in this manual, the
existing national regulations concerning accident
prevention as well as any internal company
working, operating and safety regulations must be
observed.
5
REMKO series SKT
1.6 Safety notes for the operator
The operational safety of the units and components is only assured providing they are used as
intended and in a fully assembled state.
n The units and components may only be set up,
installed and maintained by qualified personnel.
n Protective covers (grille) over moving parts
must not be removed from units that are in
operation.
n Do not operate units or components with
obvious defects or signs of damage.
n Contact with certain unit parts or components
may lead to burns or injury
n The units and components must not be
exposed to any mechanical load, extreme
levels of humidity or extreme temperature.
n Spaces in which refrigerant can leak sufficient
to load and vent. Otherwise there is danger of
suffocation.
n All housing parts and device openings, e.g. air
inlets and outlets, must be free from foreign
objects, fluids or gases.
n The units must be inspected by a service tech-
nician at least once annually. Visual inspections and cleaning may be performed by the
operator when the units are disconnected from
the mains.
.
1.7 Safety notes for installation, maintenance and inspection
n Appropriate hazard prevention measures must
be taken to prevent risks to people when performing installation, repair
cleaning work on the units.
n The setup, connection and operation of the
units and its components must be undertaken
in accordance with the usage and operating
conditions stipulated in this manual and comply
with all applicable regional regulations.
n Local regulations and laws such as Water
Ecology Act must be observed.
n The power supply should be adapted to the
requirements of the units.
n Units may only be mounted at the points pro-
vided for this purpose at the factory. The units
may only be secured or mounted on stable
structures, walls or floors.
n Mobile units must be set up securely on suit-
able surfaces and in an upright position. Stationary units must be permanently installed for
operation.
n The units and components should not be oper-
ated in areas where there is a heightened risk
of damage. Observe the minimum clearances.
, maintenance or
n The units and components must be kept at an
adequate distance from flammable, explosive,
combustible, abrasive and dirty areas or
atmospheres.
n Safety devices must not be altered or
bypassed.
Unauthorised modification
1.8
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
use of other parts may invalidate liability for
resulting consequences.
. The
1.9 Intended use
Depending on the model, the units and the additional fittings with which they are equipped are only
intended to be used as an air-conditioner for the
purpose of cooling or heating the air in an
enclosed space.
Any different or additional use is a non-intended
use. The manufacturer/supplier assumes no liability for damages arising from a non-intended use.
The user bears the sole risk in such cases.
Intended use also includes working in accordance
with the operating and installation instructions and
complying with the maintenance requirements.
The threshold values specified in the technical
data must not be exceeded.
1.10 Warranty
For warranty claims to be considered, it is essential
that the ordering party or its representative complete and return the "certificate of warranty" to
REMKO GmbH & Co. KG at the time when the
units are purchased and commissioned.
The warranty conditions are detailed in the "General business and delivery conditions". Furthermore, only the parties to a contract can conclude
special agreements beyond these conditions. In
this case, contact your contractual partner in the
first instance.
6
1.11 Transport and packaging
The devices are supplied in a sturdy shipping con-
. Please check the equipment immediately
tainer
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!
1.12 Environmental protection and recycling
Disposal of packaging
All products are packed for transport in environmentally friendly materials. Make a valuable contribution to reducing waste and sustaining raw materials. Only dispose of packaging at approved
collection points.
Disposal of equipment and components
Only recyclable materials are used in the manufacture of the devices and components. Help protect
the environment by ensuring that the devices or
components (for example batteries) are not disposed in household waste, but only in accordance
with local regulations and in an environmentally
safe manner
cling specialists or at collection points.
, e.g. using certified firms and recy-
7
REMKO series SKT
2 Technical data
2.1 Unit data
Series SKT 520 AT SKT 790 AT SKT 1060 AT
Operating mode
Nominal cooling output
1)
kW
Energy efficiency ratio SEER
Power consumption, annual, QCE
3)
kWh
Energy efficiency ratio - cooling
Nominal heat capacity
Energy efficiency ratio SCOP
2)
4)
Power consumption, annual, QHE 3)
4)
kW
kWh 1645 2056 3426
Inverter multisplit outdoor units for cooling and
heating
a)
5.2
(2.1-5.3)
a)
6.3
a)
289
a)
A++
a)
4.7
(2.1-5.6)
a)
4.0
b)
7.9
(2.1-7.9)
b)
6.6
b)
419
b)
A++
b)
5.9
(2.3-8.2)
b)
4.0
10.6
(21.1-10.6)
7.6
488
A++
9.3
(2.1-1
3.8
Energy efficiency ratio - heating A+ A+ A
Power supply
Electr. rated power consumption, cooling
Electrical rated power consumption,
heating
2)
1)
V/
Ph/Hz
230/1~/50
kW 1.75 2.47 3.89
kW 1.50 2.27 3.00
c)
c)
c)
c)
c)
1.1)
c)
Elec. power consumption, max. kW 2.30 3.30 4.60
Electrical rated current consumption,
cooling
1)
Electrical rated current consumption,
heating
2)
A
A
7.6 10.7 16.9
6.7 9.8 13.0
Elec. current consumption, max. A 12 16 21.5
Refrigerant connection, injection pipe
Refrigerant connection, suction pipe
Inches
(mm)
Inches
(mm)
3.8 (9.52)
1/4 (6.35)
3 x 3/8 + 1 x 1/2
(9.52+12.70)
Operating pressure, max. kPa 4200 / 1500
Operating range, cooling °C -15 to +50
Operating range, heating °C -15 to +24
Air flow rate, max. m³/h 2100 3500 5500
Enclosure class IP 24
Sound power level max. dB (A) 65 68 68
Sound pressure level
Refrigerant
6)
5)
dB (A) 57 60 64
R410A
8
Series SKT 520 AT SKT 790 AT SKT 1060 AT
Refrigerant, basic quantity kg 1.7 2.1
3
CO2 equivalent t 3.55 4.34 6.26
Refrigerant, additional quantity >5 m g/m 30
Max. number of indoor units 2 3 4
Refrigerant piping, max. length per IU m 20 25 30
Refrigerant piping, max. total length m 30 45 60
Refrigerant piping, max. height, upper OU m 10
Refrigerant piping, max. height, bottom OU m 15
Dimensions
mm 554 702 810
Height
Width mm 800 845 946
Depth mm 333 363 410
Weight kg 36.0 52.7 70.0
EDP 1640521 1640791 1641060
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 260 IT
b)
3 x SKT 260 IT
c)
4 x SKT 260 IT
9
A
B
C
D
E
REMKO series SKT
2.2 Unit dimensions
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 520 800 554 333 514 340
SKT 790 845 702 363 540 350
SKT 1060 946 810 410 673 403
(All measurements in mm)
10
2.3 Performance curves for heating and cooling
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]
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]
Heating capacity SKT 520
Fig. 2: Performance curves, heating SKT 520 (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 520
Fig. 3: Performance curves, cooling SKT 520 (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
11
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]
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]
REMKO series SKT
Heating capacity SKT 790
Fig. 4: Performance curves, heating SKT 790 (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 790
Fig. 5: Performance curves, cooling SKT 790 (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
12
Heating capacity SKT 1060
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]
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. 6: Performance curves, heating SKT 1060 (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 1060
Fig. 7: Performance curves, cooling SKT 1060 (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
13
TCE
TCE
TCE
2
1
4
3
5
8
9
10
11
6
7
TCE
12
13
REMKO series SKT
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 compressor precisely matches requirements, and
thereby regulates the nominal temperature with
minimal temperature deviations. This "inverter
technology" results in energy savings over conventional split systems and also reduces noise emissions to a particularly low level. The outdoor unit
can be installed in an outdoor area or, providing
that certain requirements are met, an indoor area.
The 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 260 IT that provide 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 control to regulate the speed of the condenser fan.
Floor consoles, wall consoles and refrigerant pipes
are available as accessories.
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
14
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 1060 AT
A: Outdoor area
Ba-d: Indoor area
1a-d: Indoor units
2: Outdoor unit
3: Condensate drainage line
5: Power supply
6: Shut-off valves
7: Suction pipes
8: Injection pipes
9: Control lines
4: Condenser fan
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.
15
REMKO series SKT
3.2 Combinations
Indoor unit
The IT SKT 260 indoor unit can be combined with
T SKT 520-1060 outdoor units.
the A
4 Operation
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.
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!
Fig. 10: Indoor unit
The following combinations of outdoor units can be
selected:
SKT 520 - Combination with 2 indoor units
Indoor units
Combination
1
For more, see the next page.
SKT 790 - Combination with 3 indoor units
Combination
1
SKT 1060 - Combination with 4 indoor units
2.6 kW
ll
Indoor units
2.6 kW
lll
Combination
1
Indoor units
2.6 kW
llll
16
5 Installation instructions
for qualified personnel
5.1 Important notes prior to instal-
lation
Label the refrigerant piping (injection and suction pipes) as well as the associated electrical
control lines of each interior unit with a letter
Only connect the lines to their associated connections.
n Observe the operating manuals for the indoor
unit and the outdoor unit when installing the
entire system.
n T
ransport the unit in its original packaging as
close as possible to the installation location.
You avoid transport damage by doing so.
n Check the contents of the packaging for com-
pleteness and check the unit for visible transport damage. Report any damage immediately
to your contractual partner and the shipping
company.
n Lift the unit on the corners and not on the
refrigerant or condensate drainage connections.
n The refrigerant piping (injection and suction
pipe), valves and connections must be insulated against vapour density. If necessary also
insulate the condensate drainage line.
n Select an installation location which allows air
to freely flow through the air inlet and outlet
(see section "Minimum clearances").
n Do not install the unit in the immediate vicinity
of devices which generate intensive thermal
radiation. Installation in the vicinity of thermal
radiation reduces the unit output.
n Only open the shut-off valves on the refrigerant
piping after installation is complete.
n Seal off open refrigerant piping with suitable
caps or adhesive strips to prevent the infiltration of moisture and never kink or compress
the refrigerant piping.
n Avoid unnecessary bends. This minimises the
pressure loss in the refrigerant piping and
ensures that the compressor oil can flow back
without obstruction.
n Make special preparations regarding the oil
return if the outdoor unit is located above the
indoor unit (see the "Oil return measures" section).
n Add 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.
.
n Only use the union nuts supplied with the
refrigerant piping. These should only be
removed shortly before connecting the refrigerant piping.
n Carry out all electrical wiring in accordance
with applicable DIN and VDE standards.
n Ensure the electrical cables are properly con-
nected to the terminals. Otherwise there is a
risk of fire.
NOTICE!
Always pay attention to the af
electrical lines and refrigerant piping! The connections of the individual circuits must not be
mixed up. Mixing up the assignment of control
lines and refrigerant piping can have fatal consequences (compressor damage)!
Commissioning of the individual circuits must
be carried out successively.
NOTICE!
Dif
ferent refrigerant pipes are required
depending on the cooling capacity of the outdoor unit and the indoor unit.
filiation of the
17
21 5
3 4
REMKO series SKT
5.2 Wall openings
n A wall opening of at least 70mm diameter and
10mm incline from the inside to the outside
must be created.
o prevent damage to the lines, the interior of
n T
the wall opening should be padded or, for
example, lined with PVC pipe (see figure).
n After installation has been completed, use a
suitable sealing compound to close off the wall
opening, taking account of fire protection regulations (responsibility of customer). Do not use
cement or lime containing substances!
5.4 Selection of installation location
Indoor unit
The indoor unit is designed for horizontal wall
installation above doors. However
used in the upper wall area (min. 1.75m above the
floor).
Outdoor unit
The outdoor unit is designed for horizontal installation on a base in outdoor areas. The installation
site must be level, flat and firm. The unit should
also be secured to prevent it from tipping over. 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.
, it can also be
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.
Sun
The condenser on the outdoor unit emits heat.
Exposure to sunlight further increases the temperature of the fins and reduces the heat released by
the finned heat exchanger. The outdoor unit should
be installed on to the north side of the building
whenever possible. If necessary, take measures to
provide sufficient shade (responsibility of customer). One possible solution is to build a small
roofed area over the unit. These measures should
not affect the flow of warm outlet air.
18
Wind
1
20 cm
1
2
1
K
3
W
3
If the unit is being installed in windy areas, ensure
that the warm outlet air is discharged in the prevailing wind direction. If this is not the possible, it
may be necessary to install a windbreak (to be provided by the customer). Ensure that the windbreak
does not adversely af
An additional stabilization is recommended. This
can, for example, be realized with ropes or other
structures.
fect the air intake to the unit.
Fig. 13: Minimum clearance to snow
1: Snow
Installation inside buildings
n Ensure that heat can dissipate adequately
when placing the outdoor unit in cellars, lofts,
adjoining rooms or halls (
Fig. 14).
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
.
n Install an additional fan with a rated flow com-
parative to that of the outdoor unit being
installed in the room and which can compensate any additional pressure loss in ventilation
ducts (Fig. 14).
n Comply with any regulations and conditions
fecting the statics of the building. If neces-
af
sary, fit acoustic installation.
Fig. 14: Installation inside buildings
K: Cold fresh air / W: Warm air
1: Outdoor unit / 2: Additional fan
3: Air shaft
19
2
1
A
B
C
D
E
1
A
B
2
REMKO series SKT
5.5 Minimum clearances
Observe the minimum clearances to allow access
for maintenance and repair work and facilitate
optimum air distribution.
Fig. 15: Minimum clearances for outdoor unit
1: Air inlet
2: Air outlet
SKT 520-1060
A 100
B 1200
C 600
D 150
5.6 Oil return measures
If the outdoor unit is installed at a higher level than
the indoor unit, suitable oil return measures must
be taken. Usually
every 7 metres of height difference.
Fig. 16: Oil return measures
A: Outdoor unit
B: Indoor unit
1: One oil pump bend in suction pipe to outdoor
unit every 7 metres of height dif
50 mm
2: Max. 10 m
, an oil pump bend is installed for
ference, radius:
E 600
All measurements in mm
20
6 Installation
6.1 Connection of refrigerant piping
The refrigerant piping is connected on the back
side of the units.
It may be necessary to fit a reducer or flared
adapter to the indoor unit. These fittings are
included with the indoor unit as an accessory kit.
Once installed, the connections should be insulated to make them vapour diffusion proof.
NOTICE!
Installation should only be performed by authorised specialists.
NOTICE!
The unit is factory filled with dry nitrogen for
leak testing purposes. The pressurised nitrogen
is released when the union nuts are undone.
NOTICE!
Use only tools which are approved for use in an
HVAC environment. (z. B.: bending pliers, pipe/
tubing cutters, de-burrers and flaring tools). Do
not cut refrigerant pipes with a saw.
NOTICE!
All work must be carried out in a way that prevents dirt, particles, water etc. from entering,
refrigerant lines!
The following instructions describe the installation
of the cooling cycle and the assembly of the indoor
unit and the outdoor unit.
1. The required pipe diameters are given in the
table "T
2. Install the indoor unit and connect the refrigerant piping as described in the operating
manual for the indoor unit.
3. Use the wall or floor brackets to fit the outdoor unit against structural parts approved to
support the static load (refer to the installation instructions for the brackets).
4. Ensure that structure-borne sound is not
transferred to parts of the building. Use vibration dampers to reduce the ef
ture-borne sound!
5. Lay the refrigerant piping from the indoor unit
to the outdoor unit. Ensure that the fastenings are adequate and if necessary
appropriate oil return measures!
6. Remove the factory-fitted protective caps and
union nuts on the connections. These should
be used later in the installation process.
7. Before flanging the refrigerant piping, ensure
that the union nut is fitted on the pipe.
8. Prepare the laid refrigerant piping as shown
below (
9. V
(Fig. 19).
10. First connect and hand-tighten the refrigerant
piping to ensure it is correctly seated.
11. Then tighten the fittings with 2 appropriatelysized open-ended spanners. Use one
spanner to counter the force when tightening
the fitting (Fig. 20).
12. Use insulation hoses which are designed for
this temperature range and are dif
proof.
13. Observe the permitted bending radius for the
refrigerant piping during installation. Never
bend a pipe twice in the same place. Brittleness and cracking can result.
14. Apply appropriate heat insulation to the
installed refrigerant piping, including connector
15. T
for all subsequent refrigerant piping.
echnical data".
fects of struc-
, take
Fig. 17 and Fig. 18).
erify that the shape of the flange is correct
fusion
.
ake the same action at the shut-off valves
21
2
1
1
REMKO series SKT
Label the refrigerant piping (injection and suction pipes) as well as the associated electrical
control lines of each interior unit with a letter
Only connect the lines to their associated connections.
NOTICE!
.
Always pay attention to the af
electrical lines and refrigerant piping! The connections of the individual circuits must not be
mixed up. Mixing up the assignment of control
lines and refrigerant piping can have fatal consequences (compressor damage)!
Commissioning of the individual circuits must
be carried out successively.
filiation of the
Fig. 18: Flanging the refrigerant piping
1: Flanging tool
Fig. 17: Deburring the refrigerant piping
1: Refrigerant piping
2: Deburrer
Fig. 19: Correct flange shape
22
2
1
NOTICE!
A vacuum of at least 20 mbar must be produced!
The time required to generate the vacuum is
dependent on the final pressure pipe volume of the
indoor units and the length of the refrigerant piping.
However
minutes. Once any foreign gases and humidity
have been completely extracted from the system,
the valves on the pressure gauge station are
closed and the valves on the outdoor unit are
opened as described in the "Commissioning" section.
, the process will take at least 60
Fig. 20: Tightening the fitting
1: Tighten with the first open-ended spanner
2: Counter with the second open-ended spanner
Pipe dimension in
inches
1/4" 15-20
3/8" 33-40
1/2" 50-60
5/8" 65-75
3/4" 95-105
Tightening torque in Nm
6.2 Leak testing
Once all the connections have been made, the
pressure gauge station is attached to the Schrader
valve as follows (if fitted):
red = small valve = high pressure
blue = large valve = suction pressure
Once the connection has been made successfully
the leak test is carried out with dry nitrogen.
Leak testing involves spraying a leak detection
spray onto the connections. If bubbles are visible,
the connections have not been made properly. In
that case, tighten the connection or, if necessary,
create a new flange.
After completing a successful leak test, the excess
pressure in the refrigerant piping is removed and a
vacuum pump with an absolute final partial pressure of min. 10 mbar is used to remove all of the
air and empty the pipes. Any moisture present in
the pipes will also be removed.
6.3 Additional notes on connecting
the refrigerant piping
n When combining the outdoor unit with the dif-
ferent indoor units, the procedure for connecting the refrigerant piping sometimes differs. In this case, install the expansion fittings
to the outdoor unit provided in the outdoor
unit's scope of delivery
n If the basic length of the connecting line
exceeds 5m, add refrigerant when commissioning the system for the first time (see
chapter "Adding refrigerant").
,
.
23
REMKO series SKT
6.4 Adding refrigerant
The unit contains a basic quantity of refrigerant. In
addition, an additional amount of refrigerant must
be added for refrigerant piping lengths exceeding 5
metres per circuit. Refer to the following chart:
SKT 520-1060 AT 0 g/m 30 g/m
CAUTION!
ear protective clothing when handling refrig-
W
erant.
DANGER!
Only refrigerant in a liquid state may be used to
fill the cooling cycle!
Up to and
incl. 5 m
From 5 m
7 Condensate drainage
connection and safe
drainage
Condensate drainage connection
If the temperature falls below the dew point, condensation will form on the finned condenser during
heating mode. A condensate tray should be
installed on the underside of the unit to drain any
condensate.
n The condensate drainage line should have an
incline of min. 2 %. This is the responsibility of
the customer
proof insulation.
n When operating the unit at outdoor tempera-
tures below 4 ℃, care must be taken that the
condensate drain is anti-freeze protected. The
lower part of the housing and condensate tray
is also to be kept frost free in order to ensure
permanent draining of the condensate. If necessary, fit a pipe heater
n Following installation, check that the conden-
sate run off is unobstructed and ensure that the
line is durably leak tight.
. If necessary, fit vapour-diffusion-
NOTICE!
Check the overheating to determine the refrigerant fill quantity
NOTICE!
The escape of refrigerant contributes to climatic
change. In the event of escape, refrigerant with
a low greenhouse potential has a lesser impact
on global warming than those with a high
greenhouse potential. This device contains
refrigerant with a greenhouse potential of 2088.
That means the escape of 1 kg of this refrigerant has an ef
2088 times greater than 1 kg CO2, based on
100 years. Do not conduct any work on the
refrigerant circuit or dismantle the device always enlist the help of qualified experts.
.
fect on global warming that is
Safe drainage in the event of leakages
Local regulations or environmental laws, for
example the German W
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.
NOTICE!
If condensate is removed via a duct in accordance with DIN EN 1717, ensure that any microbiological contamination present on the wastewater side (bacteria, fungi, viruses) cannot
enter the unit connected to it.
ater Resource Act (WHG),
24
8 Electrical wiring
8.1 General connection and safety instructions
For the MVT devices, an electrical supply must be
laid as a mains supply to the outdoor unit as well
as a 4-core control line from the indoor unit to the
outdoor unit.
e recommend that screened control lines are
W
used with a minimum cross-section of 1.5 mm².
DANGER!
All electrical installation work is to be performed
by specialist companies. Disconnect the power
supply when connecting the electrical terminals.
NOTICE!
The electrical connection for the units must be
made at a separate feedpoint with a residual
current device in accordance with local regulations and should be laid out by an electrician.
Proceed as follows to connect the line:
1. Remove the side panel at the connection.
2. Choose the cable cross-section in accord-
ance with the relevant specifications.
3. Feed both cables through the edge protection rings on the fixed connection panel.
4. Connect the control line to the corresponding
terminals. Pay attention to the alignment of
the circuits.
5. Fix the line in the strain relief and reassemble the unit.
Additional probe and control lines may be
required on some indoor units.
Check all plugged and clamped terminals to
verify that they are seated correctly and make
permanent contact. T
ighten as required.
We recommend using shielded wires for the
control lines.
8.2 Outdoor unit connection
Before you start to connect, note the following
instructions:
n Customers should install a terminal box in the
vicinity of the outdoor unit. W
using a main/repair switch (Figure 9).
n Voltage is supplied to the indoor unit through
the connecting line between the outdoor component and indoor unit.
n Details concerning the electrical protection of
the system are provided in the technical data.
Observe the required diameters!
n If the outdoor unit is installed on a roof, ensure
it is protected against lightning strikes.
n Label the electrical control lines and the asso-
ciated refrigerant pipes of each indoor unit with
the same letter (A to D).
n Only connect the lines to their associated con-
nections 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!
e recommend
Fig. 21: Outdoor unit connection
25
21
4
3
5
REMKO series SKT
1: Power supply
2: Strain relief
3: Control line for indoor unit A
4: Control line for indoor unit C
5: Control line for indoor unit B
Fig. 22: Electrical wiring of the cable shown on the
SKT 790 A
T as an example
26
8.3 Electrical wiring diagram
1
L(A)
N(A)
S(A)
1
L
N
1
L(B)
N(B)
S(B)
1
L(C)
N(C)
S(C)
1
L(D)
N(D)
S(D)
SKT 520 AT
SKT 790 AT
1
L (1) 1
2 (N)
S
SKT 1060 AT
1
L (1) 1
2 (N)
S
A A
1
1
L (1) 1
2 (N)
S
A
1
L (1) 1
2 (N)
S
A
SKT AT in combination with the IT SKT 260 indoor units
Fig. 23: Electrical wiring diagram
1: Power supply
A: SKT 260 IT
27
A
2
1
5
6
7
8
9
10
4
3
B
AT
L(B)
N(B)
S(B)
IT
9
REMKO series SKT
8.4 Electrical drawings
Overview diagram of SKT 520 AT
Fig. 24: Overview diagram of SKT 520 AT
A: Control board
B: Inverter board
AT: Mains cable for outdoor unit 230 V / 1~ / 50 Hz
IT: Connection for indoor units 1-2
1: Compressor
2: Fan motor condenser
3: Four-way valve
4: Crankcase heating
5: Condensate tray heating
6: Temperature probe for condenser outlet T3
7: Temperature probe for condenser inlet T4
8: Temperature probe for heat gas line TP
9: Expansion valves
10: Suction pipe temperature probes
28
Overview diagram of SKT 790 ATR
2
1
8
11
12
13
3
A
B
AT IT
9
10
7
5
64
Fig. 25: Overview diagram of SKT 790 AT
A: Control board
B: Inverter board
AT: Mains cable for outdoor unit 230 V / 1~ / 50 Hz
IT: Connection for indoor units 1-3
1: Compressor
2: Fan motor condenser
3: Transformer
4: Four-way valve
5: Crankcase heating
6: Condensate tray heating
7: Temperature probe for condenser outlet T3
8: Temperature probe for condenser inlet T4
9: High-pressure probe
10: Low-pressure probe
11: Temperature probe for heat gas line TP
12: Expansion valves
13: Suction pipe temperature probes
29
2
1
5
6
9
10
11
12
13
4
3
A
B
AT IT
C
7
8
REMKO series SKT
Overview diagram of SKT 1060 AT
Fig. 26: Overview diagram of SKT 1060 AT
A: Control board
B: Inverter board
C: Com circuit board
AT: Mains cable for outdoor unit 230 V / 1~ / 50 Hz
IT: Connection for indoor units 1-4
1: Compressor
2: Fan motor condenser
3: Transformer
4: Four-way valve
5: Crankcase heating
6: Condensate tray heating
7: Temperature probe for condenser outlet T3
8: Temperature probe for condenser inlet T4
9: High-pressure probe
10: Low-pressure probe
11: Temperature probe for heat gas line TP
12: Expansion valves
13: Suction pipe temperature probes
30
9 Before commissioning
After leak testing has been successfully completed, connect the vacuum pump via the pressure
gauge station to the valve connections on the outdoor unit (see chapter "Leak testing") and create a
vacuum.
Perform the following checks prior to putting the
unit into operation for the first time and after any
work on the cooling cycle. Record the results in the
commissioning report:
n Check all refrigerant piping and valves for leak-
tightness using leak detection spray or soapy
water
.
n Check the refrigerant piping and insulation for
damage.
n Check the electrical connection between the
indoor unit and the outdoor unit for correct
polarity.
n Check that all fastenings, mountings, etc. are
firm and at the correct level.
10 Commissioning
NOTICE!
Commissioning should only be performed by
specially trained personnel and documented
after the certificate has been issued. Observe
the operating manuals for the indoor unit and
outdoor unit when commissioning the entire
system.
Once all the components have been connected
and tested, the system can be put into operation. A
functional check should be performed to verify its
correct function and identify any unusual operating
behaviour prior to handing it over to the operator
This check is dependent on the installed indoor
units. The processes are specified in the operating
manual for the indoor units being commissioned.
NOTICE!
Always pay attention to the af
electrical lines and refrigerant piping! The connections of the individual circuits must not be
mixed up. Mixing up the assignment of control
lines and refrigerant piping can have fatal consequences (compressor damage)!
Commissioning of the individual circuits must
be carried out successively.
filiation of the
.
Functional checks and test run
Check the following points:
n Leak-tightness of the refrigerant piping.
n Compressor and fan running smoothly.
n In cooling mode, cold air output by the indoor
unit, and warm air output by the outdoor unit.
n Function test of the indoor unit and all program
sequences.
n Check of the surface temperature of the suc-
tion pipe and that the vaporiser is not overheating. To measure the temperature, hold the
thermometer to the suction pipe and subtract
the boiling point temperature reading on the
pressure gauge from the measured temperature.
n Record the measured temperatures in the
commissioning report.
31
REMKO series SKT
Function test of cooling operating mode
1. Remove the protective caps from the valves.
2. Start the commissioning procedure by briefly
opening the shut-of
unit until the pressure gauge indicates a
pressure of approx. 2 bar.
3. Check all connections for leaks with leak
detection spray and suitable leak detectors.
4. If no leaks are found, fully open the shut-of
valves by turning them anti-clockwise using a
spanner. If leaks were found, draw off the
refrigerant and rework the defective connection. It is imperative that the vacuum creation
and drying steps are repeated!
5. Activate the main circuit breaker or fuse.
6. Use the remote control to set the indoor
unit's target temperature to a value that is
lower than the existing room temperature.
f valves on the outdoor
f
NOTICE!
Check that the shut-of
are tight after carrying out any work on the
cooling cycle. Use appropriate sealant products
as necessary.
Probe description
T1 Room temperature probe for indoor unit
T2 Evaporator centre temperature probe for
indoor unit
T2B Temperature probe for suction pipe
(installed in the outdoor unit)
T3 Temperature probe for condenser outlet
f valves and valve caps
Due to the turn on delay
will start up a few minutes later.
7. Switch the indoor unit to cooling mode.
8. Check all regulating, control and safety
devices for function and correct adjustment
during the test run.
9. Check the control of the indoor unit with the
functions described in the operating instructions: timer
mode settings.
Check the individual operating parameters with the help of the display on the
outdoor unit as described in the "Functional checks and test run" section, and
note the value in the commissioning log.
10. Measure the overheating, external, internal,
discharge and evaporator temperatures and
record the test data in the commissioning log.
11. Remove the pressure gauge.
12. Proceed as previously described for all other
cooling cycles.
Final tasks
, temperature adjustments and all
, the compressor
T4 Temperature probe for condenser air inlet
T5 Temperature probe for heat gas line com-
pressor
Ts Setpoint
Outdoor unit display
The digital display is located on the outdoor unit's
control board. This display can be used to show
the current operating status.
n The display shows "- -" in standby
n The display shows the current operating fre-
quency when the compressor is running
n When defrosting, the display shows "dF" or
alternates between "dF" and the current compressor frequency (0.5s each)
n If the compressor is in the pre-heating function,
the display shows "PH" or alternates between
"PH" and the current compressor frequency
(0.5s each)
n If the system's oil return function is running, the
display shows "RO" or alternates between
"RO" and the current compressor frequency
(0.5s each)
n If winter fan speed control is active due to low
outside temperatures, the display shows "LC"
or alternates between the compressor frequency and "LC" (0.5s each)
n In “Force Cool Mode – Force Control”, the dis-
play shows "FC" or alternates between "FC"
and the current compressor frequency (0.5s
each)
n Use the remote control to set the target tem-
perature to the required value.
n Re-install all disassembled parts.
n Familiarise the operator with the system.
32
n If the compressor moves to an incorrect fre-
1
quency range within 15 minutes, a safety shutdown occurs and the unit shows "E6"
n If there is a malfunction, the malfunction is dis-
played coded. See the "Outdoor unit malfunction display" table
Fig. 27: Check key on the outdoor unit's board
1: Check key
Query operating statuses
The SW1 "Check" key is located on the control board in the outdoor unit. You can use this key to query different operating statuses. Pressing it multiple times takes you to the dif
below):
ferent parameter levels (see table
Item Display Description
0 Standard display Current compr. freq. or malfunct. display
1 Number of indoor units detected Current value
Standby:0, Recirculation mode:1, Cooling
2 Operating mode (coded)
3 Indoor unit A connected load
4 Indoor unit B connected load
5 Indoor unit C connected load
6 Indoor unit D connected load
7 Indoor unit E connected load
8 Indoor unit A power requirement
9 Indoor unit B power requirement
10 Indoor unit C power requirement
11 Indoor unit D power requirement
12 Indoor unit E power requirement
13 Total power requirement of all indoor units
mode:2, Heating mode:3 Force mode for test
purposes:4 Defrosting:5
The load is displayed in HP. If no unit is connected or detected, the display shows the following: “
3.5 kW=1.2 HP, 5kW=1.5 HP)
Current value*HP 2.0 kW=0.8 HP, 2.6kW=1.0
HP
――” (2.0 kW=0.8 HP, 2.6kW=1.0 HP,
, 3.5 kW=1.2 HP, 5kW=1.5 HP)
Current frequency requirement depending on the
14
total power requirement
15 Frequency limit
16 Frequency that is transferred to the compressor
33
REMKO series SKT
Continued
Item Display Description
Temp. of suction pipe for indoor unit A (T2BA)
17
18 Temp. of suction pipe for indoor unit B (T2BB)
Temp. of suction pipe for indoor unit C (T2BC)
19
20 Temp. of suction pipe for indoor unit D (T2BD)
21 Temp. of suction pipe for indoor unit E (T2BE)
Indoor unit A room temperature (T1A)
22
23 Indoor unit B room temperature (T1B)
24 Indoor unit C room temperature (T1C)
25 Indoor unit D room temperature (T1D)
26 Indoor unit E room temperature (T1E)
Temp. of evaporator centre for ind. unit A (T2A)
27
28 Temp. of evaporator centre for ind. unit B (T2B)
29 Temp. of evaporator centre for ind. unit C (T2C)
30 Temp. of evaporator centre for ind. unit D (T2D)
31 Temp. of evaporator centre for ind. unit E (T2E)
32 Temperature of condenser outlet (T3)
Current value. If the temperature is lower than
-9°C, the display shows "-9". If the temperature
is higher than 70°C, the display shows "70". If
no indoor unit is connected, the display shows
the following: “
Current value. If the temperature is lower than
0°C, the display shows "0". If the temperature is
higher than 70°C, the display shows "70". If no
indoor unit is connected, the display shows the
following: “
Current value. If the temperature is lower than
-9°C, the display shows "-9". If the temperature
is higher than 70°C, the display shows "70". If
no indoor unit is connected, the display shows
the following: “
――”
――”
――”
33 Temperature of condenser air inlet (T4)
The value that is displayed is between
30-129 °C. If the temperature is lower than
30°C, the display shows "30". If the temperature
34 Hot gas temperature in compressor outlet (T5)
35 Current consumption The value that is displayed is a hexadecimal
36 Current mains voltage
37 Degree of opening of injection valve A
38 Degree of opening of injection valve B
39 Degree of opening of injection valve C
40 Degree of opening of injection valve D
41 Degree of opening of injection valve E
42 Frequency limit Not used
43 Average value for probe T2
is higher than 99°C, the display shows the value
without the "1". For example, if the display
shows "0.5", the measured temperature is
105°C.
number
value "Cd", the measured value is 205.
Current value X 4. If the value is greater than
99, the display shows the 2nd and 3rd place of
the value. For example, if the display shows
"2.0", the degree of opening is 120x4=480
steps.)
(T2 total for all indoor units)/(total of all connected indoor units)(in cooling mode:T2B, in
heating mode: T2)
. For example, if the display shows the
44 Current speed of condenser fan motor
45 Previous error message 00 means no error messages have occurred
OFF:0, High:1, Medium:2, Medium/high:3 Low/
medium 4, Low/low:5
34
(3) Cooling capacity - Heating capacity OU / IU
Cooling
Display
1 2.0-2.5 2.0-2.5
2 2.0-2.5 2.0-2.5
3 3.0-3.8 3.0-3.8
4 4.5-5.0 4.5-5.0
5 5.0 5.5-6.1
6 5.5-6.1 6.1-7.0
7 6.1-7.0 6.1-7.0
8 7.0-7.5 7.0-7.5
9 7.5-8.0 7.5-8.0
10 >8.0 >8.0
(6) Hot gas temperature probe
Display Temperature (°C)
10 35-40
capacity
(kW)
Heating
capacity
(kW)
Display Temperature (°C)
70 20.0
75 22.5
80 25.0
85 27.5
90 30.0
95 32.5
99 34.5
(7) Outdoor unit current consumption
Display Current consump. (A)
44 6.0
46 6.2
54 7.4
55 7.6
58 7.8
62 8.0
11 40-45
12 45-50
13 50-55
14 55-60
15 60-65
16 65-70
(5) Air inlet temperature probe
Display Temperature (°C)
15 -7.5
20 -5.0
25 -2.5
30 0
35 2.5
40 5.0
45 7.5
50 10.0
66 8.6
67 8.8
68 9.0
70 9.2
72 9.5
76 10.0
78 10.2
80 10.4
82 10.6
84 11.0
88 11.6
92 12.0
94 12.2
55 12.5
60 15.0
65 17.5
35
REMKO series SKT
11 Troubleshooting, fault analysis and customer service
11.1 Troubleshooting and customer service
The unit and components are manufactured using state-of-the-art production methods and tested several
times to verify their correct function. However
in the list below. For systems with an indoor unit and outdoor unit, refer to the chapter "Troubleshooting and
customer service" in both operating manuals. Please inform your dealer if the unit is still not working correctly
after all function checks have been performed!
Operational malfunctions
Malfunction Possible causes Checks Remedial measures
, if alarms should occur, please check the functions as detailed
The unit does not
start or switches
itself of
f
Power failure, undervoltage,
Defective mains fuse /
main switch turned of
Damaged power supply Does all other elec. equip-
Wait time after switching
on is too short
Operational temperature
range too low/exceeded
Over-voltage or undervoltage at times
Condensate pump's
switch-of
Refrigerant piping
swapped
f contact opened
f
Does all other electrical
equipment function correctly?
Are all lighting circuits
functioning correctly?
ment function correctly?
Does a restart occur after
around 5 minutes?
Are the fans on the units
still working?
Check by specialist firm Switch the system off and
Is the external condensation pump on the indoor
unit showing "Malfunction"?
Are the injection pipes and
suction pipes of circuits A,
B and C correspondingly
connected?
Check the voltage and if
necessary
come back on
Replace mains fuse,
switch main switch on
Repair by specialist firm
Schedule longer wait times
Observe temperature
ranges
back on
Clean the condensate
pump's outlet. Have the
pump replaced
Rectification by specialist
firm
, wait for it to
The unit works at
reduced or no
cooling capacity
Electrical control lines
swapped
Air inlet and / or air outlet
opening blocked by debris.
.
Thermal/wind load has
increased.
No heat output possible. Is the outdoor unit's fan
Leaking cooling cycle Are there signs of severe
Are the control pipes and
refrigerant pipes of circuits
A, B and C correspondingly connected?
Debris in air inlet and air
outlet area?
Have structural / usage
modifications been made?
working?
frost on the large shut-of
valve?
Rectification by specialist
firm
Clean the fins. Reduce the
air resistance.
Reduce the thermal/wind
loads by taking appropriate measures.
Check the fan / winter fan
speed control.
Repair by specialist firm.
f
36
Operational malfunctions (continued)
Malfunction Possible causes Checks Remedial measures
The compressor's
suction pipe and / or
liquid separator
have iced up
Outdoor unit board malfunction display
Display Error description
E0 EEPROM error, outdoor unit
E2 Communication error between indoor unit and outdoor unit
E3 Communication error between inverter board and control board
E4 Outdoor unit air inlet temperature probe faulty
E5 Over-voltage or under-voltage error
E8 Condenser fan speed control sensor not working
F1 Temperature of suction pipe for indoor unit A faulty
F2 Temperature of suction pipe for indoor unit B faulty
F3 Temperature of suction pipe for indoor unit C faulty
Thermal load has
increased
Is the outdoor unit in permanent operating mode?
Reduce the thermal load.
If necessary
additional unit / insulate
components that have iced
up
, install an
F4 Temperature of suction pipe for indoor unit D faulty
F5 Temperature of suction pipe for indoor unit E faulty
P1 High pressure fault
P2 Low pressure alarm
P3 Compressor current consumption too high
P4 Temperature probe for heat gas line faulty
P5 Excessive temperature in condenser
P6 Inverter board safety shut-down
LP Ambient temperature too low
Note
After rectifying the fault, the malfunction code remains for 30 seconds (with the exception of E2 and E3).
37
YES
YES
NO
YES
NO
NO
NO
YES
NO
YES
NO
REMKO series SKT
11.2 Outdoor unit error analysis
Error E0: EEPROM error on outdoor unit
Switch off, wait 2 minutes and then switch on again.
Is the error still present?
Replace the control board.
Error E3: Communication error between inverter board and control board
The board shows E3
The control board cannot
communicate with the
inverter board
Is an LED still illuminated
on the inverter board?
Check the electrical con-
nection between the
inverter board and the con-
trol board. Is this correctly
implemented?
Correct the connection. Is
the error still present?
Replace the inverter board.
Is the problem rectified?
The system is ready for
operation again.
Replace the control board.
Is the problem rectified?
Replace the entire electrical
box
38
Error E5: Overvoltage or undervoltage error
NO
YES
YES
NO
YES
NO
YES
NO
Overvoltage/undervoltage
protection has tripped.
Check the power supply
voltage on the outdoor
unit's L and N terminals. Is
this between 220 and 240
V?
Is voltage present between
terminals P and N on the
inverter board? If the meas-
ured value is between
277-356 VDC (SKT 520
T), or 277-410 VDC
A
(larger versions)
Replace the rectifier. Is the
error rectified?
Correct the power supply
Replace the inverter board.
Is the unit working nor-
mally?
Replace the control board.
Problem solved.
39
NO
YES
NO
YES
NO
YES
NO
YES
NO
1 3 4 5 62
REMKO series SKT
Error E8: Condenser fan speed control not working
Switch off, wait 2 minutes
and then switch on again. Is
the error still present?
The unit operates normally.
Switch off; rotate the con-
denser fan manually
Replace the control board.
Check the DC motor (the control unit is installed in the motor)
Measure the voltage between terminals 1-3 and 4-3 on the plug when the unit is in standby mode. Compare
the measured voltage with the table below
it move easily?
Check the electrical connecting lines to the motor
Are these correctly imple-
mented?
Check the output voltage on
the control board (see
annex). Is voltage available
to the output?
Replace the fan motor.
. If the values do not match, the control board must be replaced.
. Does
.
Determine the cause and
rectify the error
Replace the connections.
.
Terminal Colour Voltage
1 Red 140 V~380 V
2 --- ---
3 Black 0 V
4 White 13.5-16.5 V
5 Yellow 0~6.5 V
6 Blue 15 V
40
Error P1: High pressure fault (for larger versions)
NO
YES
NO
YES
YES
NO
NO
YES
NO
YES
YES
NO
High pressure fault P1 is
Is the electrical connection
between the high pressure
probe and the control board
established correctly?
present.
Switch the unit off.
Check whether the high
pressure probe is faulty
Remove the high pressure
probe's plug and measure
the resistance. The value
should be 0.
Is the outside temperature
higher than 50 °C?
Is enough air fed over the
condenser?
Is the condenser fan motor
running?
.
Replace the high pressure
Clean the condenser.
See troubleshooting for
probe.
error E8
Adjust the refrigerant
volume.
41
Check the refrigerant
volume. Is the system over-
filled?
Replace the control board.
NO
YES
NO
YES
YES
NO
NO
YES
NO
YES
NO
YES
REMKO series SKT
Error P2: Low pressure alarm
Low pressure probe has
tripped. Error P2 is present.
Is the electrical connection
between the low pressure
probe and the control board
established correctly?
Correct the connection.
Switch the unit off.
Check whether the low
pressure probe is faulty
Remove the low pressure
probe's plug and measure
the resistance. The value
should be 0.
Is the ambient temperature
lower than +5 °C or -15 °C
for units with a winter fan
speed control?
Check that the valve is let-
ting through on the high
pressure side.
.
Replace the low pressure
probe.
Open the valves.
Check that the indoor unit's
fan motor is running in
cooling mode.
Replace the control board.
Error rectified?
Check the refrigerant
volume. Is refrigerant being
lost?
Problem rectified.
See troubleshooting in the
indoor unit's operating
instructions
42
Error P3: Compressor current consumption too high
YES
YES
YES
NO
YES
NO
YES
NO
YES
Safety shut-down due to
increased current consump-
tion on the compressor
Switch the unit off, switch it
back on and measure the
total current consumption.
Is this within the specified
range?
Check the cooling cycle. Is
this OK?
.
Switch the unit off.
Clean the condenser.
Problem solved.
Is the outside temperature
higher than 50 °C?
Is the condenser dirty?
Replace the control board.
Is the unit running nor-
mally?
Replace the entire electrical
box.
43
YES
NO
NO
NO
YES YES
NO
YES
REMKO series SKT
Error P4: Temperature probe for heat gas line faulty
Heat gas temperature on
the compressor too high
Check the cooling cycle for
leaks. Did you find a leak?
Rectify the leak and re-start
the system.
Is the heat gas temperature
higher than 1
Check the electrical con-
nection between the heat
gas line temperature probe
and the control board. Is
this correctly implemented?
Measure the resistance of
the heat gas line's tempera-
ture probe. Is this correct
(see Annex)?
Replace the control board.
15 °C?
Establish the electrical con-
nection correctly
Replace the temperature
probe.
.
44
Error P5: Excessive temperature on condenser
NO
NO
YES
YES
YES
NO
YES
YES
NO
NO
YES
YES
NO
YES
The unit stops if the refrigerant temperature on the condenser outlet exceeds 65 °C. It re-starts once the
temperature is 52 °C.
Excessive tempera-
ture safety shut-
down. The unit
shows P5.
Is the refrigerant
temperature on the
condenser outlet
higher than 65 °C?
Is the outside tem-
perature higher than
50 °C?
Is the condenser fan
running properly?
Check the electrical
connection between
the condenser out-
let's temperature
probe and the
board. Is it OK?
Switch the unit off.
See troubleshooting
for malfunction E8
Establish the connection correctly.
Check the temperature probe's resistance
(for resistances, see the table). Is it OK?
Replace the temper-
ature probe.
Is the condenser
dirty?
Is the refrigerant
volume correct?
Replace the control
board
Clean the con-
denser
.
45
NO
YES
NO
YES
NO
NO
YES
NO
YES
NO
NO
YES
YES
NO
YES
REMKO series SKT
Error P6: Inverter board safety shut-down (part 1)
Inverter board safety shut-
down
Check the voltage between
the inverter board's P and N
terminals. Is this between
277-366 VDC (SKT 520 A
or 277-410 VDC (larger ver-
sions)?
Check the electrical con-
nection between the control
board and the inverter
board. Is this OK?
T)
Correct the connection. Error recti-
See the second part of
this table on the next
page!
fied?
Is the compressor's elec-
trical connection configured
correctly?
Replace the inverter board.
Is the unit working nor-
mally?
Is the condenser fan motor
working properly?
Replace the control board.
Is the unit working nor-
mally?
Correct the connection. Error recti-
fied?
See troubleshooting for malfunction
E8
Problem rectified.
Replace the compressor. Is
the unit working normally?
46
Error P6: Inverter board safety shut-down (part 2)
YES
YES
NO
NO
YES
NO
NO
YES
NO
NO
YES
NO
YES NO
NO
YES
Inverter board safety
shut-down
Check the voltage
between the inverter
board's P and N termi-
nals. Is this between
277-366 VDC (SKT 520
T) or 277-410 VDC
A
(larger versions)?
Check the power supply
to the mains cable. Is
this between 208-230
V?
Are the power supply's
cables fitted correctly? Is
the neutral wire correct?
See the first part of this table on
the previous page!
Correct the power
supply
. Is the system
running normally?
Are all electrical connections in
the electrical box connected cor-
rectly?
Check that the rectifier is functioning. To do this, use a multimeter to measure between the two terminals. The resistance
value should be 0.
Check the electrical con-
nections for the rectifier
Are these correctly
implemented?
.
Replace the rectifier.
Replace the electrical
connections.
Tighten the cable. Error rectified?
Correct the electrical connection.
47
1
A
A
B
B
C
C
1
REMKO series SKT
Check the individual components
Check the temperature probes
Disconnect the temperature probe from the control board and measure the resistance on the plug's contacts.
(See tables
Ä
‘Resistance values for probes T1, T2, T3, T4 and T2B’ on page 50 and Ä on page 51)
Fig. 28: Check temperature probes
1: Multimeter
Check compressor motor resistance values
Use a multimeter to check the resistance values.
Fig. 29: Measurement of resistance values
1: Connection terminals
A: blue
B: red
C: black
Item Resistance value
ASN108D22UEZ ASM135D23UFZ ATF235D22UMT
blue-red 1.57Ω (20 °C) 1.75Ω (20 °C) 0.75Ω (20 °C)
Fig. 30: Measure the resistance values using the multimeter
48
Check the IPM board
A
A
B
B
C
C
1
Switch the unit off and wait until the condensers are completely discharged. Disconnect the cables from the
IPM board and measure the resistances between P and UVWN, UVW and N.
Voltmeter Normal resistance Voltmeter Normal resistance
(+) Red (-) Black
(+) Red (-) Black
N U
¥
U V
P
Multiple MOhm
V W
W (+) Red
Check the resistance values for the fan motor on the indoor unit
Use a multimeter to check the resistance values.
Fig. 31: Measurement of resistance values
1: Connection terminals
A: red
B: black
C: white
¥
N
Multiple MOhm
Item Resistance value
YKSS-68-4-15-1
(W
eilng)
Black - red 285.8Ω ±8% (20 °C)
Red - yellow 178.5Ω ±8% (20 °C)
Yellow - blue 178.5Ω ±8% (20 °C)
49
K Ohm K Ohm K Ohm K Ohm
REMKO series SKT
Resistance values for probes T1, T2, T3, T4 and T2B
50
Resistance values for probe T5
K Ohm K Ohm K Ohm K Ohm
51
REMKO series SKT
12 Care and maintenance
Regular care and observation of some basic points
will ensure trouble-free operation and a long
service life.
DANGER!
Prior to performing any work, ensure the equipment is disconnected from the voltage supply
and secured to prevent accidental switch-on!
Care
n Ensure the unit is protected against dirt, mould
and other deposits.
n Only clean the unit using a damp cloth. Do not
use a jet of water.
n Do not use any caustic, abrasive or solvent-
based cleaning products
n When operating the fan, clean the fins of the
unit prior to long shutdown periods.
Maintenance
n It is recommended that you take out a mainte-
nance contract with an annual service from an
appropriate specialist firm.
This enables you to ensure the operational reliability of the plant at all times!
NOTICE!
Statutory regulations require an annual leak test
for the cooling cycle dependant on the refrigerant quantity. Inspection and documentation of
the work performed is to be carried out by specialist technicians.
Type of task
Checks/maintenance/inspection
General
Check voltage and current
Check function of compressor/fans
Dirt on condenser
Check the refrigerant volume
Check condensate drainage
Check insulation
Check moving parts
Sealing test for cooling cycle
1)
see note above
Commis-
sioning
l
l
l
l l
l
l
l
l
l
Monthly Half-
yearly
l
l
Yearly
l
l
l
l
l
1)
l
52
13 Shutdown
Temporary shutdown
1. Let the indoor unit run for 2 to 3 hours in
recirculation mode, or in cooling mode at
maximum temperature, to extract any
residual humidity from the unit.
2. Shut down the system using the remote control.
3. Switch of
unit.
4. Cover the unit as far as possible with plastic
foil in order to protect it from the influences of
weather
Permanent shutdown
Ensure that units and components are disposed of
in accordance with local regulations, e.g. through
authorised disposal and recycling specialists or at
collection points.
REMKO GmbH & Co. KG or your contractual
partner will be pleased to provide a list of certified
firms in your area.
f the electrical power supply to the
.
53
1
2
19
20
7
8
18
24
17
16
13
14
10
5
6
11
3
9
4
15
12
22
21
25
23
REMKO series SKT
14 Exploded view and spare parts lists
14.1 Exploded view of the unit SKT 520 AT
Fig. 32: Exploded view of the unit SKT 520 AT
We reserve the right to modify the dimensions and design as part of the ongoing technical development
process.
54
14.2 Spare parts list for SKT 520 AT
IMPOR
To ensure the correct delivery of spare parts, please always the device type with the corresponding serial
number (see type plate)
No. Designation
1 Condenser protection grille
2 Condenser front panel
3 Fan blade
4 Fan motor
5 4-way valve
6 Electronic injection valve
7 Floor panel
8 Cover panel
9 Compressor
10 Heat gas probe
11 Shut-off valve, suction pipe
TANT!
12 Side section, left
13 Temperature probe for condenser outlet
14 Condenser temperature probe
15 Condenser
16 Inverter board
17 Control board
18 Refrigerant connections cover
19 Condensate tray heating
20 Crankcase heating
21 Fan motor mount
22 Shut-off valve, injection pipe
23 Partitioning panel
24 Side section, right
25 Service valve bracket
55
1
2
3
24
12
15
5
11
21
9
7
19
20
8
13
14
16
17
18
23
4
6
22
21
26
25
REMKO series SKT
14.3 Exploded view of the unit SKT 790 AT
Fig. 33: Exploded view of the unit SKT 790 AT
We reserve the right to modify the dimensions and design as part of the ongoing technical development
process.
56
14.4 Spare parts list for SKT 790 AT
IMPOR
To ensure the correct delivery of spare parts, please always the device type with the corresponding serial
number (see type plate)
No. Designation
1 Condenser protection grille
2 Condenser front panel
3 Fan blade
4 Fan motor
5 4-way valve
6 Electronic injection valve
7 Floor panel
8 Cover panel
9 Compressor
10 Heat gas probe
11 Shut-off valve, suction pipe
TANT!
12 Side section, left
13 Temperature probe for condenser outlet
14 Condenser temperature probe
15 Condenser
16 Inverter board
17 Control board
18 Refrigerant connections cover
19 Condensate tray heating
20 Crankcase heating
21 Fan motor mount
22 Shut-off valve, injection pipe
23 Partitioning panel
24 Side section, right
25 Service valve bracket
57
1
2
3
4
25
24
26
22
23
13
15
14
18
20
19
21
27
9
10
8
12
11
6
5
7
28
16
17
29
REMKO series SKT
14.5 Exploded view of the unit SKT 1060 AT
Fig. 34: Exploded view of the unit SKT 1060 AT
We reserve the right to modify the dimensions and design as part of the ongoing technical development
process.
58
14.6 Spare parts list for SKT 1060 AT
IMPOR
To ensure the correct delivery of spare parts, please always the device type with the corresponding serial
number (see type plate)
No. Designation
1 Condenser protection grille
2 Condenser front panel
3 Fan blade
4 Fan motor
5 4-way valve
6 Low-pressure probe
7 High-pressure probe
8 Electronic injection valve
9 Compressor
10 Liquid separator
11 Shut-off valve, suction pipe
TANT!
12 Shut-off valve, injection pipe
13 Temperature probe for condenser outlet
14 Air inlet temperature probe
15 Temperature probe for heat gas line
16 Condenser
17 Inverter board
18 Control board
19 Side section, right
20 Cover for refrigerant connections
21 Compressor room front panel
22 Side section, left
23 Cover panel
24 Crankcase heating
25 Condensate tray heating
26 Fan motor mount
27 Floor panel
28 Partitioning panel
29 Service valve bracket
59
REMKO series SKT
15 Index
A
Alarms
Checks .............................36
Possible causes ...................... 36
Remedial measures ................... 36
C
Care and maintenance ................... 52
Check the DC motor ..................... 40
Combination possibilities ..................16
Condensate drainage connection ........... 24
Customer service ....................... 36
D
Disposal of equipment .....................7
E
Electrical wiring ......................... 25
Electrical wiring diagram .................. 27
Environmental protection ...................7
Exploded view of the unit ............54, 56, 58
F
Function test of cooling operating mode ......32
Functional checks ....................... 31
I
Installation location, selection .............. 18
Installation materials ..................... 18
Intended use ............................ 6
M
Maintenance ........................... 52
Measurement from
Compressor motors ................... 48
Indoor unit fan motor .................. 49
IPM board .......................... 49
emperature probes ................... 48
T
Minimum clearances ..................... 20
O
Oil return measures ......................20
Ordering spare parts ............... 55
Outdoor unit board malfunction display ....... 37
, 57, 59
P
Performance charts
Cooling ....................... 11, 12, 13
Heating ....................... 11, 12, 13
Propellant in accordance with Kyoto Protocol ... 9
R
Resistance values
Probe T5 ........................... 51
Probes T1, T2, T3, T4 and T2B .......... 50
S
Safe drainage in the event of leakages ....... 24
Safety
Dangers of failure to observe the safety
notes ............................... 5
General ............................. 5
Identification of notes ................... 5
Notes for inspection .................... 6
Notes for installation ....................6
Notes for maintenance .................. 6
Personnel qualifications ................. 5
Safety notes for the operator ............. 6
Safety-conscious working ................5
Unauthorised modification ...............6
Unauthorised replacement part manufacture . 6
Selection of installation location ............ 18
Shutdown
Permanent .......................... 53
Temporary .......................... 53
Spare parts list ................... 55, 57, 59
T
Test run ............................... 31
Troubleshooting and customer service ....... 36
W
Wall opening ........................... 18
Warranty ............................... 6
60
61
REMKO series SKT
62
Consulting
Thanks to intensive training,
our consultants are always
completely up-to-date in terms
of technical knowledge. This has
given us the reputation of being
more than just an excellent,
reliable supplier:
REMKO, a partner
helping you find solutions to
your problems.
Distribution
REMKO offers not just a well
established sales network both
nationally and internationally, but
also has exceptionally highlyqualified sales specialists.
REMKO field staff are more than
just sales representatives: above
all, they must act as advisers to
our customers in air conditioning
and heating technology.
SFlbCustomer Service
Our equipment operates
precisely and reliably. However,
in the event of a fault, REMKO
customer service is quickly at
the scene. Our comprehensive
network of experienced dealers
always guarantees quick and
reliable service.
REMKO INTERNATIONAL
… and also right in your neighbourhood!
Make use of our experience and advice
We reserve the right to make technical changes, and provide no guarantee as to the accuracy of this data!
REMKO GmbH & Co. KG
Air conditioning and heating technology
Im Seelenkamp 12 D-32791 Lage
Postfach 1827 D-32777 Lage
Telephone +49 5232 606-0
Telefax +49 5232 606-260
E-mail info@remko.de
Website www.remko.de
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