Daikin CTXU25G2V1B User manual

SiBE12-908

Specifications, designs and other content appearing in this brochure are current as of January 2009 but subject to change without notice.

SiBE12-908

Printed in Japan 01/2009 B AK

SiBE12-908

[Applied Models]

 Inverter Multi : Heat Pump

Service Manual / Inverter Multi System with Humidifying G-Series

Preliminary

Inverter Multi System

with Humidifying

G-Series

SiBE12-908

Table of Contents i

Inverter Multi System

with Humidifying

G-Series

zHeat Pump

Indoor Unit

CTXU25G2V1B

CTXU35G2V1B

CTXU42G2V1B

CTXU50G2V1B

Outdoor Unit

2MXU40GV1B

2MXU50GV1B

SiBE12-908

ii Table of Contents

SiBE12-908

Function and Control 1

Part 4

Function and Control

1. Main Functions........................................................................................2

1.1 Frequency Principle..................................................................................2

1.2 Thermostat Control...................................................................................4

1.3 Automatic Operation.................................................................................5

1.4 Programme Dry Function .........................................................................6

1.5 Airflow Direction Control...........................................................................7

1.6 Fan Speed Control for Indoor Units..........................................................8

1.7 HUMID HEAT Operation ..........................................................................9

1.8 Fresh Air Supply Ventilation ...................................................................14

1.9 2-AREA INTELLIGENT EYE ..................................................................16

1.10 Inverter POWERFUL Operation .............................................................18

1.11 ECONO Mode ........................................................................................19

1.12 NIGHT SET Mode ..................................................................................20

1.13 Other Functions......................................................................................21

1.14 Table for Special Modes.........................................................................23

2. Function of Thermistor ..........................................................................25

2.1 Heat Pump Model...................................................................................25

3. Control Specification .............................................................................27

3.1 Mode Hierarchy ......................................................................................27

3.2 Automatic switching for HUMID HEAT operation room..........................28

3.3 Frequency Control..................................................................................29

3.4 Controls at Mode Changing / Start-up....................................................31

3.5 Discharge Pipe Temperature Control.....................................................33

3.6 Input Current Control..............................................................................33

3.7 Freeze-up Protection Control .................................................................34

3.8 Heating Peak-cut Control .......................................................................34

3.9 Fan Control.............................................................................................35

3.10 Liquid Compression Protection Function 2.............................................35

3.11 Defrost Control .......................................................................................36

3.12 Electronic Expansion Valve Control .......................................................37

3.13 Malfunctions ...........................................................................................41

3.14 Forced Operation Mode .........................................................................42

3.15 Additional Function.................................................................................43

Main Functions SiBE12-908

2Function and Control

1. Main Functions

1.1 Frequency Principle

Main Control

Parameters

The compressor is frequency-controlled during normal operation. The target frequency is set by

the following 2 parameters coming from the operating indoor unit:

The load condition of the operating indoor unit

The difference between the room temperature and the set temperature

Additional

Control

Parameters

The target frequency is adapted by additional parameters in the following cases:

Frequency restrictions

Initial settings

Forced cooling operation

Inverter Principle To regulate the capacity, a frequency control is needed. The inverter makes it possible to vary

the rotation speed of the compressor. The following table explains the conversion principle:

Drawing of

Inverter

The following drawing shows a schematic view of the inverter principle:

Phase Description

1The supplied AC power source is converted into the DC power source for the present.

2The DC power source is reconverted into the three phase AC power source with variable

frequency.

When the frequency increases, the rotation speed of the compressor increases resulting

in an increased refrigerant circulation. This leads to a higher amount of the heat

exchange per unit.

When the frequency decreases, the rotation speed of the compressor decreases

resulting in a decreased refrigerant circulation. This leads to a lower amount of the heat

exchange per unit.

50 Hz

60 Hz

Refrigerant circulation rate (high)

Amount of heat

exchanged air (large)

Amount of heat

exchanged air (small)

power

freq=

constant

power

Amount of heat

exchanged air (large)

Amount of heat

exchanged air (small)

high f

low f

freq=variable capacity=

variable

Refrigerant circulation rate (low)

high speed

low speed

(R2812)

SiBE12-908 Main Functions

Function and Control 3

Inverter Features The inverter provides the following features:

The regulating capacity can be changed according to the changes in the outdoor air

temperature and cooling / heating load.

Quick heating and quick cooling

The compressor rotational speed is increased when starting the heating (or cooling). This

enables a quick set temperature.

Even during extreme cold weather, the high capacity is achieved. It is maintained even when

the outdoor air temperature is 2°C.

Comfortable air conditioning

A detailed adjustment is integrated to ensure a fixed room temperature. It is possible to air

condition with a small room temperature variation.

Energy saving heating and cooling

Once the set temperature is reached, the energy saving operation enables to maintain the

room temperature at low power.

Frequency Limits The following table shows the functions that define the minimum and maximum frequency:

Forced Cooling

Operation

For more information, refer to “Forced operation mode” on page 42.

60 120 300

45˚C

Air discharge

temperature

inverter

normal heat pump

Start seconds

(R1187)

Frequency limits Limited during the activation of following functions

Low Four way valve operation compensation. Refer to page 31.

High Discharge pipe temperature control. Refer to page 33.

Input current control. Refer to page 33.

Compressor protection function. Refer to page 32.

Heating peak-cut control. Refer to page 34.

Freeze-up protection control. Refer to page 34.

Defrost control. Refer to page 36.

Main Functions SiBE12-908

4Function and Control

1.2 Thermostat Control

Thermostat control is based on the difference between the room temperature and the set point.

Thermostat OFF Condition

The temperature difference is in the zone A.

Thermostat ON Condition

The temperature difference is above the zone C after being in the zone A.

The system resumes from defrost control in any zones except A.

The operation turns on in any zones except A.

The monitoring time has passed while the temperature difference is in the zone B.

(Cooling / Dry : 10 minutes, Heating : 10 seconds)

Cooling / Dry

Heating

OFF

Cooling : –0.5˚C

Dry : –0.5˚C

Room temperature - set point

Cooling : –2.0˚C

Dry : –2.5~–2.0˚C

(R4668)

OFF

2.0˚C

Room temperature - set point

0.5˚C

(R9424)

SiBE12-908 Main Functions

Function and Control 5

1.3 Automatic Operation

Automatic Cooling / Heating Function

When the AUTO mode is selected with the remote controller, the microcomputer automatically

determines the operation mode from cooling and heating according to the room temperature

and setting temperature at the time of the operation startup, and automatically operates in that

mode.

The unit automatically switches the operation mode to cooling or heating to maintain the room

temperature at the main unit setting temperature.

Detailed

Explanation of

the Function

1. Remote controller setting temperature is set as automatic cooling / heating setting

temperature (18 to 30°C).

2. Main unit setting temperature equals remote controller setting temperature.

3. Mode switching point are as follows.

Heating →Cooling switching point:

Room temperature ≥Main unit setting temperature +3.0 deg.

Cooling →Heating switching point:

Room temperature < Main unit setting temperature –2.5 deg.

Thermostat ON / OFF point is the same as the ON / OFF point of cooling or heating

operation.

4. During initial operation

Room temperature ≥Remote controller setting temperature: Cooling operation

Room temperature < Remote controller setting temperature: Heating operation

Ex: When the set point is 25°C

Cooling Operation →23°C: Thermostat OFF → 22°C: Switch to Heating Operation

Heating Operation → 27°C: Thermostat OFF →28°C: Switch to Cooling Operation

(R9417)

Set point +3.0ºC

Set point –2.0ºC

=Thermostat OFF

Set point +2.0ºC

=Thermostat OFF

Heating Operation

Set point –2.5ºC

Cooling Operation

Main Functions SiBE12-908

6Function and Control

1.4 Programme Dry Function

Programme dry function removes humidity while preventing the room temperature from

lowering.

Since the microcomputer controls both the temperature and airflow volume, the temperature

adjustment and fan adjustment buttons are inoperable in this mode.

In Case of

Inverter Units

The microcomputer automatically sets the temperature and fan settings. The difference

between the room temperature at startup and the temperature set by the microcomputer is

divided into two zones. Then, the unit operates in the dry mode with an appropriate capacity for

each zone to maintain the temperature and humidity at a comfortable level.

Room temperature at

startup

Set temperature

Thermostat OFF point

Thermostat ON point

24ºC or more

Room temperature at

startup

X –2.5ºC

X –0.5ºC

Y + 0.5ºC (zone B)

continues for 10 min.

23.5ºC

X –2.0ºC

X –0.5ºC

Y + 0.5ºC (zone B)

continues for 10 min.

18ºC

18ºC X –2.0ºC

X –0.5ºC = 17.5ºC

Y + 0.5ºC (zone B)

continues for 10 min.

17.5ºC

Zone B Zone B

Zone A = Thermostat OFF

Zone C = Thermostat ON

+0.5ºC

(R6841)

SiBE12-908 Main Functions

Function and Control 7

1.5 Airflow Direction Control

Power-Airflow

Dual Flaps

The large flaps send a large volume of air downwards to the floor. The flap provides an optimum

control area in cooling, heating, and dry mode.

Heating Mode

During heating mode, the large flap enables direct warm air straight downwards. The flap

presses the warm air above the floor to reach the entire room.

Cooling / Dry Mode

During cooling or dry mode, the flap retracts into the indoor unit. Then, cool air can be blown far

and pervaded all over the room.

Wide-Angle

Louvres

The louvres, made of elastic synthetic resin, provide a wide range of airflow that guarantees a

comfortable air distribution.

Auto-Swing The following table explains the auto swing process for heating, cooling, dry, and fan :

3-D Airflow Alternative repetition of vertical and horizontal swing motions enables uniform air-

conditioning of the entire room. This function is effective for starting the air conditioner.

When the horizontal swing and vertical swing are both set to auto mode, the airflow become

3-D airflow and the horizontal swing and vertical swing motions are alternated. The order of

swing motion is such that it turns counterclockwise, starting from the right upper point as

viewed to the front side of the indoor unit.

COMFORT

AIRFLOW

The vertical swing flap is controlled not to blow the air directly on the person in the room.

Vertical Swing (up and down) Horizontal Swing

(right and left:

automatic)

Cooling / Dry Heating Fan

15˚

50˚

30˚

55˚

(R8315) (R8316)

30˚

70˚

30˚

65˚

(R8317)

5˚

80˚

30˚ 65˚

(R8318)

45˚





(R1024)

Heating Cooling

(R8413)

80°

(R4302)

5°

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