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1 Service Information---------------------------------------------- 4

1.1. Example of trouble at test operation ------------------ 4
1.2. Caution of test operation--------------------------------- 4
1.3. Caution during automatic address setting----------- 4
1.4. Caution during instation------------------------------- 4

1.5. Operation range -------------------------------------------- 5

2 Features-------------------------------------------------------------- 6

2.1. Cassette Type features ----------------------------------- 6
2.2. Outdoor Unit  ------------------------------------------------ 6
2.3. Wired Remote Control ------------------------------------ 8

2

2.4. Wireless Remote Control---------------------------------8
2.5. Group Control Equipment --------------------------------9

3 Product Specification------------------------------------------ 10

3.1. S-F18DB4E5  U-B18DBE5 ---------------------------- 10
3.2. S-F24DB4E5  U-B24DBE5 ---------------------------- 11
3.3. S-F28DB4E5  U-B28DBE5 ---------------------------- 12
3.4. S-F28DB4E5  U-B28DBE8 ---------------------------- 13
3.5. S-F34DB4E5  U-B34DBE5 ---------------------------- 14
3.6. S-F34DB4E5  U-B34DBE8 ---------------------------- 15
3.7. S-F43DB4E5  U-B43DBE8 ---------------------------- 16
3.8. S-F50DB4E5  U-B50DBE8 ---------------------------- 17
3.9. Safety Devices -------------------------------------------- 18

4 Dimensions ------------------------------------------------------- 20

4.1. S-F18DB4E5  S-F24DB4E5  S-F28DB4E5

S-F34DB4E5 ---------------------------------------------- 20

4.2. S-F43DB4E5  S-F50DB4E5 --------------------------- 21
4.3. U-B18DBE5  U-B24DBE5  U-B28DBE5

U-B28DBE8------------------------------------------------ 22

4.4. U-B34DBE5  U-B34DBE8  U-B43DBE8

U-B50DBE8------------------------------------------------ 23

5 Refrigeration Cycle --------------------------------------------- 24

5.1. S-F18DB4E5 U-B18DBE5  ---------------------------- 24
5.2. S-F24DB4E5 U-B24DBE5,S-F28DB4E5

U-B28DBE5/U-B28DBE8 ----------------------------- 25

5.3. S-F34DB4E5 U-B34DBE5/U-B34DBE8,

S-F43DB4E5 U-B43DBE8,S-F50DB4E5
U-B50DBE8 ----------------------------------------------- 26

6 Block Diagram --------------------------------------------------- 27

6.1. S-F18DB4E5  S-F24DB4E5  S-F28DB4E5

S-F34DB4E5  S-F43DB4E5  S-F50DB4E5 ------- 27

6.2. U-B18DBE5  U-B24DBE5  U-B28DBE5 ----------- 27
6.3. U-B34DBE5------------------------------------------------ 27
6.4. U-B28DBE8------------------------------------------------ 28
6.5. U-B34DBE8  U-B43DBE8  U-B50DBE8 ----------- 28

7 Wiring Diagram -------------------------------------------------- 29

7.1. S-F18DB4E5 ---------------------------------------------- 29
7.2. S-F24DB4E5  S-F28DB4E5S-F34DB4E5

S-F43DB4E5  S-F50DB4E5 --------------------------- 30

7.3. U-B18DBE5  U-B24DBE5  U-B28DBE5 ----------- 31
7.4. U-B34DBE5------------------------------------------------ 32
7.5. U-B28DBE8------------------------------------------------ 33
7.6. U-B34DBE8  U-B43DBE8  U-B50DBE8 ----------- 34

8 Operation Instructions ---------------------------------------- 35

8.1. Wired Remote Control (Optional part) -------------- 35
8.2. Remote Control - Display ------------------------------ 36
8.3. Remote Control - Panel -------------------------------- 37
8.4. How to set remote control day and time------------ 38
8.5. How To Select The Timer ------------------------------ 38
8.6. Daily Timer Setting--------------------------------------- 39
8.7. Weekly Timer Setting------------------------------------ 40
8.8. Wireless Remote Control (Optional part)----------- 42

9 Operation Details------------------------------------------------ 43

9.1. Cooling Operation---------------------------------------- 43
9.2. Heating Operation---------------------------------------- 44
9.3. Soft Dry Operation --------------------------------------- 44
9.4. Auto Operation-------------------------------------------- 44
9.5. Fan Operation--------------------------------------------- 44
9.6. Normal Control-------------------------------------------- 45
9.7. Operation Control ---------------------------------------- 47
9.8. Protection Control ---------------------------------------- 51
9.9. Test Run ---------------------------------------------------- 52

10 Installation Instruction---------------------------------------- 53

10.1. Pipe length ------------------------------------------------ 53
10.2. Refrigerant additional charge ------------------------- 55
10.3. Position of the centre gravity ------------------------- 56
10.4. Indoor unit installation ---------------------------------- 57
10.5. Outdoor unit installation   ------------------------------ 70
10.6. Wired remote control installation--------------------- 82
10.7. Wireless remote control installation manual ------ 89
10.8. Twin Operation ------------------------------------------- 96

R410A--------------------------------------------------------------- 97

11.1. Outline ------------------------------------------------------ 97
11.2. Tools for installing/servicing refrigerant piping --- 98
11.3. Refrigerant piping work ------------------------------- 102
11.4. Installation, transferring, servicing------------------ 104

12 Troubleshooting Guide -------------------------------------- 108

12.1. For standard installation ------------------------------ 108
12.2. During twin operation ---------------------------------- 110
12.3. During group control operation ---------------------- 112
12.4. Test operation and self-diagnosis ------------------ 113
12.5. Emergency operation ---------------------------------- 117
12.6. Self-diagnosis error code table---------------------- 119

13 Technical Data -------------------------------------------------- 121

13.1. Cooling capacity performance data ---------------- 121
13.2. Heating Capacity Performance Data -------------- 124
13.3. Capacity and power consumption ------------------ 125
13.4. Reaching distance-------------------------------------- 144
13.5. Sound data ----------------------------------------------- 147
13.6. Sound measuring point ------------------------------- 154
13.7. Fan performance---------------------------------------- 155
13.8. Discharge and suction pressure -------------------- 159
13.9. Operating characteristics ----------------------------- 161

14 Exploded View (Indoor Unit) ------------------------------- 162

14.1. S-F18DB4E5  S-F24DB4E5  S-F28DB4E5

S-F34DB4E5  S-F43DB4E5  S-F50DB4E5 ------ 162

14.2. S-F18DB4E5  S-F24DB4E5  S-F28DB4E5

S-F34DB4E5  S-F43DB4E5  S-F50DB4E5 ------ 163

15 Replacement Part List (Indoor Unit)--------------------- 164

15.1. S-F18DB4E5  S-F24DB4E5  S-F28DB4E5 ------ 164
15.2. S-F34DB4E5  S-F43DB4E5  S-F50DB4E5 ------ 165

16 Exploded View (Front Grille)------------------------------- 166

16.1. S-F18DB4E5  S-F24DB4E5  S-F28DB4E5

S-F34DB4E5  S-F43DB4E5  S-F50DB4E5 ------ 166

17 Replacement Part List (Front Grille) -------------------- 167
18 Exploded View (Outdoor Unit) ---------------------------- 168

18.1. U-B18DBE5  U-B24DBE5  U-B28DBE5

U-B28DBE8 ---------------------------------------------- 168

18.2. U-B18DBE5  U-B24DBE5  U-B28DBE5

U-B28DBE8 ---------------------------------------------- 169

19 Replacement Part List (Outdoor Unit) ------------------ 170

19.1. U-B18DBE5  U-B24DBE5  U-B28DBE5

U-B28DBE8 ---------------------------------------------- 170

20 Exploded View (Outdoor Unit) ---------------------------- 172

20.1. U-B34DBE5  U-B34DBE8  U-B43DBE8

U-B50DBE8 ---------------------------------------------- 172

20.2. U-B34DBE5  U-B34DBE8  U-B43DBE8

U-B50DBE8 ---------------------------------------------- 173

20.3. U-B34DBE5  U-B34DBE8  U-B43DBE8

U-B50DBE8 ---------------------------------------------- 174

21 Replacement Part List (Outdoor Unit) ------------------ 175

3

21.1. U-B34DBE5  U-B34DBE8  U-B43DBE8

U-B50DBE8 ---------------------------------------------- 175

22 Print Pattern----------------------------------------------------- 176

22.1. Indoor Unit Printed (Main) ---------------------------- 176
22.2. Indoor Unit Printed (Indicator) ----------------------- 177
22.3. Outdoor Unit (Main) ------------------------------------ 177

4

(Manual address setting is also possible by using Dip switch on Indoor unit P.C. board.) However, this address setting is only
possible when made proper wiring connection and also Indoor unit should be original virgin unit.

If found out as following phenomenon at test operation on site, it may have possibility of wrong address setting.
Therefore, please ensure of the address setting.

1. LCD display of wired remote control had not illuminate although the main power supply switch is ‘on’.
2. LCD display had indicated as normal illumination when power supply switch is ‘on’, however outdoor unit cannot be operated.

(But, it is necessary to take 3 to 5 minutes for outdoor unit to start from the timing of remote control ON/OFF switch is ‘on’.)

3. P.C. board had memorized wrong setting information.

a. If main power supply is switched ‘on’ with the wrong connection.
b. When changing the connection or combination of units due to re-installation etc.

• When changing the system from group control to normal one to one system.
• When making the replacement of units as master and slave etc.

Do not touch the remote control switch and do not change any wirings for one minute when the main power supply switch is ‘on’.
(Because the unit is having automatic address setting during the first one minute.)

When main power supply switch is ‘on’, the P.C. board will automatically memorize the connecting system.
Consequently, when initial power supply is ‘on’, there will not be interchangeability of units even of the same type and same
capacity unit. Therefore unable to connect the unit to another system.

To protect the compressor, after installation of new unit/pump down, be sure to select cooling mode first, and run the unit in this
mode for 5 minutes or more.
If the cooling operation is not executed first for five minutes or more, the heating operation cannot be executed.