Microsoft word ms11 chapter 2 equipment selection-tcm135-60924

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



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



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



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



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


Heating 2.0 7.0 8.0


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


Heating 1.3 3.4 4.5


Heating 1.4 4.0 5.0

Cooling 2.0 5.0 5.2 ATXS50E2V1B

Heating 2.0 5.8 6.0




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.:



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).



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.



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.



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



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.




RYN50/60E2V1B, continued

Installation

space

Fig.: Outdoor unit positioning



(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


(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.




(A)RK/XS50/60/71E2V1B, continued

Installation

space




(A)RXG25/35E(2)V1B


(A)RXG25/35E(2)V1B


Gas line (mm) 9.5 mm


(A)RXG25/35E(2)V1B

Total length 20 m

Level difference 15


Additional

refrigerant

charge



Continued on next page



(A)RXG25/35E(2)V1B, Continued

Installation

space



ARK/XS20/25/35E2V1B


ARK/XS20/25/35E2V1B


Gas line (mm) 9.5 mm


(A)RXG25/35E(2)V1B

Total length 20 m

Level difference 15


Additional

refrigerant

charge






ARK/XS20/25/35E2V1B, Continued

Installation

space



2(A)MXS52E2V1B, 3MXS52E2V1B, 3(A)MKS50E2V1B, 4MKS58E2V1B.


2(A)MXS52E2V1B/3MXS52E2V1B/3(A)MK

S50E2V1B/4MKS58E2V1B

Liquid line

Gas line 6.4 – 9.5 – 12.7 – 15.9



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


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


Additional

refrigerant

charge

Add 20 g/m when total piping length exceeds 30 m.

Fuses Daikin recommends using a ? A safety breaker. (2MK/XS40DVMB)




2(A)MXS52E2V1B, 3MXS52E2V1B, 3(A)MKS50E2V1B, 4MKS58E2V1B., continued

Installation

space




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



4MKS58D 4MXS68D

Max. piping to each indoor 25


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


indoor/outdoor if the outdoor is lower

than 1 or more indoors

7.5 m

Total length of piping 60


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.




4MXS68E2V1B, 4MKS58E2V1B,, Continued

Installation

space




5MKS90E7V3B, 5MXS90E7V3B, 4MXS80 E7V3B,


5MKS90E7V3B, 5MXS90E7V3B,

4MXS80 E7V3B

Liquid line (mm) 6.4

Gas line (mm) 9.5 / 9.5 / 12.7 / 15.9 (/ 15.9)



4MXS80 E7V3B 5MKS90E7V3B,

5MXS90E7V3B

Max. piping to each indoor 25 m 25 m


indoors if the outdoor is positioned

higher than all the indoors

7.5 m 7.5 m


indoor units if the outdoor is lower


15 m 15 m


indoor/outdoor if the outdoor is lower


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


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)




4MKS90DVMB, 4MXS80DVMB, continued

Fuse Daikin recommends a 20 A fuse

Installation

space




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.


Microsoft word ms11 chapter 2 equipment selection-tcm135-60924

Business

heating capacity

capacity tablesintroductionfor

required capacity

rated capacity

right unit

correct unit

account capacity demand

capacity shortage complaints