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MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 1
2 Equipment selection
What is in this chapter?
Introduction Selecting the right unit for the right application can prevent a lot of problems.
In this chapter we would like to introduce you to information which will help
you select the correct unit. However, even with the right unit, there will still
be some points of attention, which will have to be taken into account.
Overview This chapter covers the following topics
Topic See Page
2.1 Selection specifications
2.2 Combination possibilities
2.3 Installation specifications
2.4 Application precautions
MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 2
2.1 Selection specifications
Overview This chapter covers the following topics
Topic See Page
2.1.1 Non inverters
2.1.2 Inverters
2.1.3 Correction factors
2.1.4 Capacity tables
2.1.5 Attention points in selection
MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 3
2.1.1 Non inverters
Introduction You should select a unit by comparing the (maximum possible) heat load of a
room to the nominal capacity of a unit.
If your heat load is much larger than your nominal capacity, you will have
capacity shortage complaints.
If your heat load is much smaller than the nominal capacity, your unit will
switch on/off a lot, which has a negative effect on the lifetime of a unit.
Capacity table Global Mini Split
Unit Mode Nominal Capacity [kW]
Cooling 5.0 FT(Y)N50EV1B
Heating 5.8
Cooling 6.0 FT(Y)N60EV1B
Heating 7.0
MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 4
2.1.2 Inverters (DC inverter)
Introduction When selecting an inverter controlled A/C unit, it is of the up most
importance to select a unit with a nominal capacity as close as possible to the
heat load of the room. When selecting a unit, which is too small, the
compressor will operate continuously on its maximum frequency like a non
inverter. If you select a unit that has too much capacity, the minimum
frequency of the compressor can still generate too much capacity and switch
the compressor on/off like a non inverter. You can see that in both these
cases an inverter has no added value compared to a non inverter which is a lot
cheaper.
Minimum
capacity
Maximum
capacity
When the unit is in thermostat ON, there is a minimum compressor frequency
and a minimum expansion valve opening. If the required capacity is below
the minimum capacity of the compressor, the unit will switch ON-OFF.
When a unit runs at its maximum frequency and the expansion valve is
opened to the maximum the unit will give its maximum capacity. (For the
mentioned indoor/outdoor and accordingly to the installation conditions.)
However it is very important that you realize that this will not always be
the case, even when the capacity demand is high. The unit is controlled by
a micro-controller and the micro-controller will take all factors into account
(capacity demand, safeties, efficiency, sensors, etc. …) and then decide the
best frequency. If you combine this together with piping length losses, it is
very likely that when you select a unit on the maximum capacity you will
have complaints of capacity shortage.
Continued on the next page
MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 5
2.1.2 Inverters (DC inverter), continued
Capacity table Global Mini Split
Capacity [kW] Unit Mode
Minimum Nominal Maximum
Cooling 2.0 5.0 6.0 FTK/XS50EV1B
Heating 2.0 5.8 7.7
Cooling 2.0 6.0 6.7 FTK/XS60EV1B
Heating 2.0 7.0 8.0
Cooling 4.0 7.1 8.5 FTK/XS71EV1B
Heating 4.0 8.2 10.0
Cooling 1.3 2.5 3.0 FTXG25EV1BW/S
Heating 1.3 3.4 4.5
Cooling 1.4 3.5 4.8 FTXG35EV1BW/S
Heating 1.4 4.2 5.0
Cooling ? ? ? CTXG50EV1BW/S
Heating ? ? ?
Cooling ? ? ? ATXG25EV1B
Heating ? ? ?
Cooling ? ? ? ATXG35EV1B
Heating ? ? ?
Cooling ? ? ? ATXG50E2V1B
Heating ? ? ?
Cooling 1.3 2.4 3.0 FDK/XS25EVMB
Heating 1.3 3.2 4.5
Cooling 1.4 3.4 3.8 FDK/XS35EVMB
Heating 1.4 4.1 5.0
Cooling 1.3 2.0 2.6 ATK/XS20E2V1B
Heating 1.3 2.7 4.1
Cooling 1.3 2.5 3.0 ATK/XS25E2V1B
Heating 1.3 3.4 4.5
Cooling 1.4 3.4 3.8 ATK/XS35E2V1B
Heating 1.4 4.0 5.0
Cooling 2.0 5.0 5.2 ATXS50E2V1B
Heating 2.0 5.8 6.0
Continued on the next page
MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 6
2.1.3 Correction factors
Correction factors When the piping exceeds a certain length, a correction factor has to be
multiplied with the rated capacity.
The cooling and the heating capacity of the unit have to be corrected in
accordance with the length of the refrigerant piping. (The distance between
the indoor unit and the outdoor unit)
Fig.:
MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 7
2.1.4 Capacity tables
For the Multi outdoor units, when your connection ratio goes above 100%,
the minimum, nominal and maximum capacities will lower (only when the
capacity demand of the indoor units is greater than the outdoor unit can
deliver). What your minimum, nominal and maximum capacity will be when
this happens, you can read out on the capacity tables. (Engineering Databook)
The maximum allowed connection ratios are
Modelname Max. connectable
capacity (kW)
2(A)MXS52EV1B
3MKS50E2V1B
3(A)MXS52E2V1B
4MKS58E2V1B
4MXS68E2V1B
4MKS75E2V1B
4MXS80E7V3B
5MKS90E7V3B
5MXS90E7V3B
8.5
9.5
9.0
10.0
11.0
13.5
14.5
15.6
15.6
Introduction
For the C/O units, there’s an additional function programmed that will limit
the operation of units when you connect more than the allowed capacity.
When an indoor unit is switched on, over sizing the allowed operational
capacity of a C/O multi, the last unit which is turned ON will go into stand-by
mode (slowly blinking indoor operation LED). It will only resume operation
once operation in the other rooms (or one room) has stopped.
This function has been added to prevent the compressor from overheating
(overload clixon).
MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 8
2.1.5 Selection attention points
Introduction When selecting a model there are some points of attention. You should
select your type of unit and installation place carefully.
Living room
this is often used from morning to night,
an energy saving unit would be
recommended
Selection
according to
room type.
Bedroom It is important to select an air conditioner,
which is quiet and does not blow (draft)
directly onto the occupants.
Rectangular
rooms
Install the unit so it blows into the length
of the room.
Long rooms, Install separate units to blow air through
the room.
Selection
according to air
circulation for
different room
types.
Odd shaped
rooms
Install separate units to prevent air
accumulation in one place.
Wall mounted
type
This type of unit allows great air
circulation in cooling, this due to its high
position. This position is however a
disadvantage for heating, as heat rises,
stratification is possible.
Floor type This type of unit is more suitable for
heating applications than cooling
applications. Since hot air rises there are
few temperature differences between
heights.
Selection
according to air
circulation
distinctive to the
different air
conditioning
types.
Ceiling hung
type
This type of unit can be put in a central
position in the room, allowing a good air
circulation.
MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 9
2.2 Combination possibilities
Introduction On the following page you will find our combination table. These pictograms
point out the possibilities as well as the limitations of the combinations. Also
a file which is named FAQ (Frequently Asked Questions) is added. This will
give you some more clarification why certain specific combinations are not
possible.
MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 10
2.3 Installation specifications
Introduction This chapter gives a summary of the basic technical specifications concerning
piping which are essential to a decent installation. All this information can be
found back in the installation manual of the specific unit.
Overview
Topic See Page
RYN50/60E2V1B
(A)RK/XS50/60/71E2V1B
(A)RXG25/35E(2)V1B
ARK/XS20/25/35E2V1B
2(A)MXS52E2V1B, 3(A)MK/XS50/52E2V1/MB,
4MKS58E2V1B
4MK/X58/68E2V1B
5MK/XS90E7V3B, 4MXS80E7V3B
Additional explanation on installation comments
MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 11
RYN50/60E2V1B
Pipe sizes The table below shows the available piping connections.
RYN50/60E2V1B
Liquid line 6.4 mm
Gas line 12.7 mm
Table : piping dimensions
Piping lengths The table below shows the maximum allowed piping lengths.
RYN50/60E2V1B
Total length 30 m
Level difference 20 m
Table: piping lengths
Additional
refrigerant
charge
For the RYN50/60E2V1B add 20 g/m when piping exceeds 10 m.
Fuses Daikin recommends using a 20A safety breaker.
Continued on the next page
MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 12
RYN50/60E2V1B, continued
Installation
space
Fig.: Outdoor unit positioning
MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 13
(A)RK/XS50/60/71E2V1B
Pipe sizes The tables below show the available piping connections
(A)RK/XS50/60E2V1B RK/XS71E2V1B
Liquid line (mm) 6.4 mm
Gas line (mm) 12.7 mm 15.9 mm
Table : Piping dimensions
Piping lengths The table below shows the maximum allowed piping lengths.
(A)RK/XS20/25/35DVMB
Total length 30 m
Level difference 20 m
Table: Piping lengths
Additional
refrigerant
charge
Add 20 g/m when piping length exceeds 10 m.
Fuses Daikin recommends using a 20 A safety breaker.
Continued on the next page
MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 14
(A)RK/XS50/60/71E2V1B, continued
Installation
space
Fig.: Outdoor unit positioning
MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 15
(A)RXG25/35E(2)V1B
Pipe sizes The tables below show the available piping connections
(A)RXG25/35E(2)V1B
Liquid line (mm) 6.4 mm
Gas line (mm) 9.5 mm
Piping lengths The table below shows the maximum allowed piping lengths.
(A)RXG25/35E(2)V1B
Total length 20 m
Level difference 15
Table: Piping lengths
Additional
refrigerant
charge
Add 20 g/m when piping length exceeds 10 m.
Fuses Daikin recommends using a 16 A safety breaker.
Continued on next page
MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 16
(A)RXG25/35E(2)V1B, Continued
Installation
space
MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 17
ARK/XS20/25/35E2V1B
Pipe sizes The tables below show the available piping connections
ARK/XS20/25/35E2V1B
Liquid line (mm) 6.4 mm
Gas line (mm) 9.5 mm
Piping lengths The table below shows the maximum allowed piping lengths.
(A)RXG25/35E(2)V1B
Total length 20 m
Level difference 15
Table: Piping lengths
Additional
refrigerant
charge
Add 20 g/m when piping length exceeds 10 m.
Fuses Daikin recommends using a 16 A safety breaker.
Continued on next page
MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 18
ARK/XS20/25/35E2V1B, Continued
Installation
space
MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 19
2(A)MXS52E2V1B, 3MXS52E2V1B, 3(A)MKS50E2V1B, 4MKS58E2V1B.
Pipe sizes The tables below show the available piping connections
2(A)MXS52E2V1B/3MXS52E2V1B/3(A)MK
S50E2V1B/4MKS58E2V1B
Liquid line
Gas line 6.4 – 9.5 – 12.7 – 15.9
Table : Piping dimensions
Piping lengths The table below shows the maximum allowed piping lengths.
2(A)MXS52E2V1B/3MXS52E2V1B/3(A)
MKS50E2V1B/4MKS58E2V1B
Piping to each indoor 25 m
Total piping 50 m
Min piping length to each indoor 3 m
Max. level difference between 2
indoors if the outdoor is
positioned higher than all the
indoors
7.5 m
Max. level difference between 2
indoor units if the outdoor is
lower than 1 or more indoors
15 m
Max level difference between
indoor/outdoor if the outdoor is
lower than 1 or more indoors
7.5 m
Table: Piping lengths
Additional
refrigerant
charge
Add 20 g/m when total piping length exceeds 30 m.
Fuses Daikin recommends using a ? A safety breaker. (2MK/XS40DVMB)
Continued on the next page
MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 20
2(A)MXS52E2V1B, 3MXS52E2V1B, 3(A)MKS50E2V1B, 4MKS58E2V1B., continued
Installation
space
Fig.: Outdoor unit positioning
MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 21
4MXS68E2V1B, 4MKS58E2V1B,
Pipe sizes The tables below show the available piping connections.
4MKS58D 4MXS68D
Liquid line(mm) 6.4 / 6.4 / 6.4 / 6.4 6.4 / 6.4 / 6.4 / 6.4
Gas line (mm) 9.5 / 9.5 / 12.7 / 12.7 9.5 / 9.5 / 12.7 / 12.7
Table : Piping dimensions
Piping lengths The table below shows the maximum allowed piping lengths.
4MKS58D 4MXS68D
Max. piping to each indoor 25
Max. level difference between 2
indoors if the outdoor is positioned
higher than all the indoors
7.5
Max. level difference between 2 indoor
units if the outdoor is lower than 1 or
more indoors
15 m
Max level difference between
indoor/outdoor if the outdoor is lower
than 1 or more indoors
7.5 m
Total length of piping 60
Table: Piping lengths
Additional
refrigerant
charge
Add 20 g/m when total piping length exceeds 30 m.
Cooling only units are chargeless! There is no need for additional refrigerant!
Fuses Daikin recommends using a ?? A safety breaker.
Continued on next page
MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 22
4MXS68E2V1B, 4MKS58E2V1B,, Continued
Installation
space
Fig.: Outdoor unit positioning
MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 23
5MKS90E7V3B, 5MXS90E7V3B, 4MXS80 E7V3B,
Pipe sizes The tables below show the available piping connections
5MKS90E7V3B, 5MXS90E7V3B,
4MXS80 E7V3B
Liquid line (mm) 6.4
Gas line (mm) 9.5 / 9.5 / 12.7 / 15.9 (/ 15.9)
Table : Piping dimensions
Piping lengths The table below shows the maximum allowed piping lengths.
4MXS80 E7V3B 5MKS90E7V3B,
5MXS90E7V3B
Max. piping to each indoor 25 m 25 m
Max. level difference between 2
indoors if the outdoor is positioned
higher than all the indoors
7.5 m 7.5 m
Max. level difference between 2
indoor units if the outdoor is lower
than 1 or more indoors
15 m 15 m
Max level difference between
indoor/outdoor if the outdoor is lower
than 1 or more indoors
7.5 m 7.5 m
Total length of piping 70 m 75 m
Min piping length to one indoor unit 3 m 3 m
Table: Piping lengths
Additional
comments • Always connect a minimum of 2 rooms for heat pump systems.
• The shortest allowable length per room is 3 m.
Additional
refrigerant
charge
• Add 20 g/m when total piping length exceeds 30 m.
• For cooling only models, there’s no need to additionally charge. ???(see
installation manual)
Continued on the next page
MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 24
4MKS90DVMB, 4MXS80DVMB, continued
Fuse Daikin recommends a 20 A fuse
Installation
space
Fig.: Outdoor unit positioning
MS11 Split inverter course Daikin Europe NV
CHAPTER 2: Equipment selection 2- 25
Additional comments on installation specifications
Installation
Manual Additional refrigerant is necessary when the piping exceeds a certain
length. For the multi units however you don’t need to add any
refrigerant for C/O units.
Explanation The evaporator regulates the superheat (SH), the larger your evaporating
capability (fan speed, size heat exchanger, heat exchanging capability) the
larger your SH will be.
The condenser regulates your subcool (SC), which is needed for the
expansion valve to work properly.
In cooling the evaporator is the indoor coil and the condenser the outdoor
coil. This changes when the unit is in heating, so the sizes of the H/E can
change.
In heating on small loads the unit will have a small SC (low condensing
capability). When refrigerant is added the SC goes up. Adding refrigerant
also means that the SH will go down but in heating there’s a large evaporator
which can handle this surplus of refrigerant.
Installation
Manual Always connect at least 2 rooms to a Multi.
Explanation (Strictly speaking, for heat pump models only.)
If you connect only 1 indoor unit you will have compressor damage due to the
following reasons:
1. Abnormal high pressure
Surplus refrigerant is accumulated in the indoor unit during heating operation,
at that point, the heat exchanger thermistor is in sub cooling area and it can
not sense the saturated temperature. Therefore the safety (peak cut operation)
can not function leaving the unit prone to high pressures.
However, surplus refrigerant is accumulated in the non operating unit whilst
one unit is operating in a two unit connection in heating mode.
2. Poor lubrication by refrigerant oil
When you connect only 1 indoor unit to a multi, surplus refrigerant is
accumulated in the indoor unit or accumulator. In case the refrigerant is
accumulated in the accumulator, you’ll have wet operation and poor
lubrication and this will lead to compressor damage.
Continued on the next page