LATS – Multi V - Klimatizace TSC

© 2007 Air-conditioning Academy All rights reserved 

LATS – Multi V 

LG Air-conditioning Air conditioning Academy 

1

Contents 

1. Multi-V Plus model selection by product data book method (Manual Calculation) 

1) Model Selection Process 

2) Indoor Units Selection 

3) Outdoor Units Selection 

4) Calculate Performance Data 

5) System Check 

2. Multi V Plus model selection by LATS Multi V software (Without CAD) 

1) Program Installation guide 

2) User guide 

3. Multi V Plus model selection by LATS Multi V software (With CAD) 

1) User guide 


2

Model selection process 

Basic raw data for 

model selection 

•Total Load 

(sensible & latent load) 

•Air volume (CFM) 


System selection 

•Indoor units 

•Outdoor units 

•Capacity coefficient factor 

Electrical wiring 

•Field wiring 

•characteristics 

3 

Branch selection 

•Y-branch 

•Header branch 

Control wiring 

selection 

•Method 

•Devices

Load calculation data (cooling and heating) 

Design 

Conditions 


Cooling 

Indoor 26℃DB/18℃WB 

Outdoor 35℃/24℃WB 

Load conditions 

Room No. 

Room 1 

Room 2 

Room 3 

Room 4 

Room 5 

Room 6 

Room 7 

Heating 

Indoor 20℃ DB /15 ℃WB 

Outdoor 7℃DB/6℃WB 

4 

Load (kW) 

4.9 

3.6 

1.9 

2.4 

6.2 

7.5 

1.9 

Calculate room load 

with the help of LATS 

load calculation 

software or manually 

Value assumed for 

showing mathematical 

calculation involved in 

manual method 

•Refrigerant piping 

•Outdoor unit is above indoor

Proposed system diagram (assumed data) 

Maximum elevation between 

O/D and I/D 1, 2 and 3 = 20m 

O/D and I/D 4, 5, 6 and 7 = 30m 

Total piping length = 145m 

Farthest piping length = 70m 


40m 

10m 10m 7m 

5m 

7m 

10m 

Room 7 

Room 1 

10m 

18m 

5 

7m 

Room 2 

7m 

7m 

7m 

Room 5 

Room 6 

Room 4 

Room 3

Indoor unit selection 

•Design parameters values 

•Total capacity value 

•Outdoor capacity index 

•Outdoor performance data 

•Interpolation & calculation 



Outdoor unit selection 

Combination ratio 

Actual capacity of O/D 

at combination ratio 

Corrected capacities 

calculations (O/D & I/D) 

Elevation & total piping 

length correction factor 

Defrosting factor 

For heating mode 

NO Yes 

Matching of Capacities 

(indoor/outdoor) 

6 


•Total and sensible capacities 

•Indoor capacity index 

• Indoor unit type 

•Total indoor capacities index 

•Standard outdoor capacity index (at 100%) 

•Calculation at 100% 

•Refer Product Data 

book defrost charts 

•Correction factor charts 

•Total piping length & elevation 

•Individual piping length & elevation 

Heating calculations


Consider indoor unit having higher rated capacity 

(at specified condition) than cooling/heating 

capacity required for the corresponding room 

• Refer product data book indoor unit specifications 

(as shown on the next page). 

• Design condition : Indoor 26℃DB/18℃WB & 

Outdoor 35℃DB/27℃WB 


Cooling load requirement from manual 

calculation or LATS-load software 

Location 

Cooling Load 

Total (kW) Sensible (kW) 

Unit Cooling 

Total(kW) Sensible (kW) 

SH Factor 

Capacity index 

(Qidu_index) 

Room 1 4.9 2.94 5 3.8 76.00% 18 

Room 2 3.6 2.16 5 3.8 76.00% 18 

Room 3 1.9 1.14 2 1.5 75.00% 7 

Room 4 2.4 1.44 2.4 1.8 75.00% 9 

Room 5 6.2 3.72 6.6 5 75.76% 24 

Room 6 7.5 4.5 7.7 6 77.92% 28 

Room 7 1.9 1.14 2 1.5 75.00% 7 

Total 28.4 17.04 30.7 23.4 111 

7 

•Refer to the same capacity 

table for checking the capacity 

index at that conditions. 

Total capacity 

index = 111 

(∑Q idu_index )



Q idu_index = 12 


Q idu_index = 18 


• At Indoor 26℃DB/18℃WB &Outdoor 35℃ 

• Product data book page no. 270 (R-22) 

8 

Capacity index, total cooling (TC) & 

Sensible heat cooling (SHC) can be 

checked for each model from PD book 

like mentioned 

TC=3.3 

SHC=2.5 

TC=5.0 

SHC=3.8



















NO Yes 

Matching of Capacities 


9 















We have already checked that the sum of total I/D unit capacity index is (∑Qidu_index) =111. So the selected 

outdoor unit should be such that ∑Qidu_index lie in between it 100% to 130% capacity index. Start matching 

capacity index with lower capacity O/D unit first. The values in the table are {Qodu_index}. 


111 lies between 110% and 

120% combination capacity of 

10 hp outdoor unit. 

If this outdoor unit capacity does not satisfy the final total corrected capacities 

of indoor unit then we can choose the next higher capacity outdoor unit. 

We have already checked that the sum of total I/D unit capacity index is 

(∑Qidu_index) =111. So the selected outdoor unit should be such that 

∑Qidu_index lie in between it 100% to 130% capacity index. Start matching 

capacity index with lower capacity O/D unit first. The values in the table are 

{Qodu_index}. 

If this outdoor unit capacity does not satisfy the final total corrected capacities of 

indoor unit then we can choose the next higher capacity outdoor unit. 

10














calculations (O/D & I/D 





NO Matching of Capacities 


Yes 

11 















Model 

s 

10hp 

Maximum No. 

of 

connectable 

indoor units 

16 


Capacity index range (Qodu_index ) 

Minimum index (at Index at standard rating Maximum index (at 

50% connected (at 100% connected 130% connected 

capacity) 

capacity) 

capacity) 

48 

96 

125 

• Actual number of connected indoor units are 7 (less than maximum number 16). 

• The values in the above table at 100% capacity will be used to calculate 

combination ratio. 

• R combi = ∑Q idu_index / Q odu_index {Calculated at 100% outdoor unit capacity index} 

Models 

10hp 

Total indoor units 

capacity index 

∑Q idu_index 

111 

Index at standard 

rating (100%) 

(Q odu_index ) 

96 

12 


R combi = ∑Q idu_index / Q odu_index 

111/96 = 115.625% 

Combination ratio helps in calculating actual capacities of outdoor/indoor units.

Actual capacity of O/D at combination ratio 




















Yes 

13 
















Q odu_index = 115(at 120%) 


Q odu_index = 106(at 110%) 


The table below tell about the actual capacities and power 

input by the outdoor unit at specific indoor unit 

combination. (10hp) 

14 

TC=29.8 

PI=9.54 

TC=28.9 

PI=9.30


• Now using interpolation method the actual capacity of outdoor unit at the 

combination ratios can be calculated. 

• Q odu(Ti,To, Rcombi) is a function of indoor, outdoor temperature and combination ratio. 

Model 

10hp 

Q odu_ind 

ex 

(a) 

115 

106 

Important note : (e) & (f) are calculated on interpolation method such as 

For ex. Index at combination ratio (10hp) = 106 + [(115.625-110)*(115-106)]/(120-110) = 111.06 

Actual capacity (10hp) = 28.9 + [(115.625-110)*(29.8-28.9)] / (120-110) = 29.4 (at 115.625%) 


Indoor 

Combinatio 

n (%) 

(b) 

120 

110 

Total 

cooling 

(c) 

29.8 

28.9 

Combination 

ratio 

R combi = 

∑Q idu_index / 

Q odu_index 

(d) 

115.625% 

15 

Outdoor Index 

at combination 

ratio 

(e) 

111.06 

Actual capacity 

Q odu(Ti,To,Rcombi) 

(kW) 

(f) 

29.4(115.625%)

Corrected capacities calculations (O/D & I/D) 




















Yes 

16 














Corrected capacities calculations (I/D) 

• Till here 

• ∑Q idu_index = 111 

• Q odu_index = 96 (100%) 

• R combi = ∑Q idu_index / Q odu_index = 115.625 

• Q odu(Ti,To,Rcombi) = 29.4kW 

•Indoor unit Corrected capacity is calculated individually. 

• Q idu_corrected = [Q idu_index / ∑Q idu_index ] × Q odu(Ti,To,Rcombi) 

Corrected outdoor unit capacity = 29.4kW I/D unit 1 actual = ( 18 / 111 ) × 29.4 = 

4.77 

Room No. 

Room 1 

Room 2 

Room 3 

Room 4 

Room 5 

Room 6 

Room 7 


Actual Sensible 

capacity (kW) heat (kW) 

5.00 3.80 

5.00 3.80 

2.00 9.00 

2.40 1.80 

6.60 5.00 

7.70 6.00 

2.00 1.50 

30.70 30.90 

Capacity 

Index 

18 4.77 

18 4.77 

7 1.85 

9 2.38 

24 6.36 

28 7.42 

7 1.85 

111 29.40 

17 

Correted 

capacity(kW) 

Corrected 

sensible heat (kW) 

3.62 

3.62 

1.39 

1.79 

4.83 

5.86 

1.39 

22.51

Elevation & total piping length correction factor 




















Yes 

18 
















1 

2 and 3 

19 

For the indoor unit 1, 2 and 3 

Level difference = 20m. 

Equivalent lengths are 57m, 67m and 

67m correspondingly 

Outdoor unit is above indoor units 

From the above chart the elevation & total piping length 

correction factor {f (length, elevation) } for for indoor unit 1, 2 and 3 are 

0.935, 0.922 and 0.922 correspondingly



4, 5 and 7 6 

20 

For the indoor unit 4, 5, 6 and 7 

Level difference = 30m. 

Equivalent lengths are 62m, 62m, 70m 

and 62m correspondingly 

Outdoor unit is above indoor units 

From the above chart the elevation & total piping length correction factor {f (length, elevation) } 

for for indoor units 4, 5, 6 and 7 are 0.925, 0.925, 0.918 and 0.925 correspondingly

Final capacities (indoor unit) 

•Final indoor unit capacity is calculated by the given formula. 

• Q odu_final = Q idu_corrected ×f (length, elevation) 

Correted 

capacity(kW) 


Corrected sensible heat 

(kW) 

4.77 3.62 

4.77 3.62 

1.85 1.39 

2.38 1.79 

6.36 4.83 

7.42 5.78 

1.85 1.39 

29.40 22.43 

Length and elevation 

correction factor 

0.935 

0.922 

0.922 

0.925 

0.925 

0.918 

0.925 

21 

Final indoor unit 

capacity (kW) 

4.46 

4.40 

1.71 

2.21 

5.88 

6.81 

1.72 

27.17 

Final sensible 

heat (kW) 

3.39 

3.34 

1.28 

1.65 

4.47 

5.31 

1.29 

20.73

Matching capacities (indoor & outdoor unit) 




















Yes 

22 














Matching capacities (indoor & outdoor unit) 

• Now each indoor unit capacity both actual and sensible is compared with the required parameters. 

• Also total overall load requirements are compared with the requirement. 

• If it is satisfactory then selection of units are ok but if any one indoor or outdoor unit fails in requirement we 

have to go for higher capacity models. 

Location 

Cooling load 


Room 1 4.90 2.94 

Room 2 3.60 2.16 

Room 3 1.90 1.14 

Room 4 2.40 1.44 

Room 5 6.20 3.72 

Room 6 7.50 4.50 

Room 7 1.90 1.14 

Total 28.40 17.04 


Final cooling capacity 



18 

18 

7 

9 

24 

28 

7 

111 

23 

4.46 3.39 

4.40 3.34 

1.71 1.28 

2.21 1.65 

5.88 4.47 

6.81 5.31 

1.72 1.29 

27.17 20.73 

The values with arrow should be equal or more than the cooling load. but in this 

case they are lower. So we will upgrade indoor units one by one and follow the 

whole process again. Till we get optimal solution.

Iteration Conclusion 

• So finally after iterations optimal solution is set as above 

• Outdoor unit changed to 12 hp unit from 10hp unit. 


Cooling load 

Location 


Room 1 

Room 2 

Room 3 

Room 4 

Room 5 

Room 6 

Room 7 

Total 

Location 

Room 1 

Room 3 

Room 4 

Indoor unit 

24K 

Room 2 18K 

4.90 2.94 

3.60 2.16 

1.90 1.14 

2.40 1.44 

6.20 3.72 

7.50 4.50 

1.90 1.14 

28.40 17.04 

9K 

12K 

Comments 

Ok 

Ok 

Ok 

Ok 

Capacity Final cooling capacity 

Index Total (kW) Sensible (kW) 

24 5.85 4.39 

18 4.33 3.25 

9 2.16 1.60 

12 2.95 2.19 

28 6.89 5.18 

36 8.78 6.59 

9 2.21 1.64 

136 33.17 24.84 

Location 

24 

Room 5 

Room 6 

Room 7 

O/D unit 

Indoor unit 

28k 

36K 

9k 

12hp 

Comments 

Ok 

Ok 

Ok 

Ok

2. Multi V Plus model selection 

by LATS Multi V software (Without CAD) 


25

Program Installation guide 

For downloading LATS model selection software 

Log on to LG global website : www.lgeaircon.com 

For access to website contact to sales manager of your area 

Note: Access to this site is permitted to LG employees only 


26


1. Click to Partner Support and new window will open 

2. Click Technical Data 

3. Then click Software and Software download window will open 


27


Select latest version of LATS-Multi V: Multi V Model Selection 


28


Then click to hyperlink “Download LATS-Multi V” and select folder for 

downloading in your PC. 


29


1. For start setup LATS Multi V click install icon 

2. Click next to continue process 


30 

1. Click on install icon 

2. Click Next (No Special Option) 

3. Click Yes for accepting downloading agreement 

3. Read agreement and click “Yes” (if you don’t accept it then you can’t install 

LATS)


6. Start copying files and Finish Installation. 


31 

4. Input 

User Name 

Company Name. 

Input Installation Password “latsmultiv” 

5. Click Next Button . 

4. Fill User Name and Company name. Input password “latsmultiv” 

5. Click Next to continue install 

6. Start copying files and Finish Installation

User Guide 


After successful installation of software the given below window will open 

LATS-Multi V Initial Window. 

32

User Guide 


1. Project Information Menu 

2. Click on Create Project 3. Create Project Window will open 

Be sure to disable 

CAD option if you 

are not using CAD 

drawing for model 

selection 


33 

4. Input Project Name 

5. Select Unit system 

6. Select Cooling or Heating Mode 

7. Select ODU Type 

8. Give any special comment (optional) 

9. Click Next 

2. Click on Create Project 

3. Create Project Window will open 






9. Click Next 

Be sure to disable CAD option if you are not using CAD drawing for model 

selection

User Guide 

10. Select Country and City 

11. Input Design condition. 

12. Click Next 


34 




Change design condition if 

given values not satisfied 

your requirement 

If you change one of the 

following air property 

(DBT,WBT,RH), 

psychometric process will 

execute and find other 

related value. So it’s easy to 

define air property. 

Change design condition if given values not satisfied your requirement 

If you change one of the following air property (DBT,WBT,RH), psychometric 

process will execute and find other related value. So it’s easy to define air 

property.

User Guide 


13. This window will open. 

14. When selecting Open Load, You can load the result calculated by LATS-LOAD 


35 


16. If LATS LOAD values are 

not available manual load 

entry can also be done simply 

by adding values in columns 

15. Add floor or Add space as required. For adding and 

removing Floor or Space first click on the row and then 

click Add or Remove 

14. When selecting Open Load, You can load the result calculated by 

LATS-LOAD 

15. Add floor or Add space as required. For adding and removing Floor or 

Space first click on the row and then click Add or Remove 

16. If LATS LOAD values are not available manual load entry can also be 

done simply by adding values in columns

User Guide 


36 

17. Input Customer & 

contractor Information it 

will be printed out while 

making report. 

18. After filling all data click Finish 

17. Input Customer & contractor Information it will be printed out while 


18. After filling all data click Finish

User Guide 

System Panel 

19. This window will appear 


System Property Window 


37 

Indoor Unit Toolbar 

20. From here we will start selecting outdoor units, indoor 

units, branch pipes and header pipes according to design 

21. Double click on outdoor unit icon 

for selecting outdoor unit 

20. From here we will start selecting outdoor units, indoor units, branch pipes and 

header pipes according to design 

21. Double click on outdoor unit icon for selecting outdoor unit

User Guide – Main tool bar 

New system 

System setting 

Save project 


Auto piping 

Delete system 

Copy system 

System check 

38 

View control wire 

System panel 

Toggle navigator 

Toggle description 

View reports 

Space load summary 

System pre-view (tree only) 

System validation property 

View pipe line 

distribution 

View power line

User Guide – Other tool bar 

Arrow 

New Outdoor 

New Indoor 

New Room 

New Pipe 

New Equipment 

Rotate Angle 

Create Net 


New Climb 

Delete Unit 

Rotate Unit 

Fit window 

Pan 

Grid on/off 

Ortho on/off 

Import DWG file 

39 

Undo 

Redo 

Zoom in 

Zoom out 

Zoom window 

Export DXF file

User Guide 

Other optional 

accessory can also be 

choose by clicking 

this button 


23. Select proper unit as per load requirement 

24. In heating case select defrost factor 


40 


Or you can use Auto 

Selection for seeing possible 

connectable O/D unit 

23. Select proper unit as per 

load requirement 

24. In heating case select 

defrost factor 

25. These specifications will 

change according to the product 

automatically 

26. After selecting above value click OK 

25. These specifications will change according to the product automatically 


Other optional accessory can also be choose by clicking this button 

Or you can use Auto Selection for seeing possible connectable O/D unit

User Guide 

27. The new outdoor unit will appear. 

28. Double click on Stand by 


41 

27. The new outdoor unit will appear. 

28. Double click on Stand by 

No. of connected I/D units // 

Maximum No. of connectable I/D 

units 

I/D unit capacity index // O/D unit 

capacity index (combination ratio) 

Total connected piping length // 

Maximum total piping length 

No. of connected I/D units // Maximum No. of connectable I/D units 

I/D unit capacity index // O/D unit capacity index (combination ratio) 

Total connected piping length // Maximum total piping length

User Guide 


30. Choose one of them 


42 


30. Choose one of 

them 

Choose Y branch for connecting 2 

indoor unit or more branching 

Select Header branch for connecting 

more than 2 indoor unit at one 

branching point 

Or you can select indoor unit 

Choose Y branch for connecting 2 indoor unit or more branching 

Select Header branch for connecting more than 2 indoor unit at one branching 

point or you can select indoor unit

User Guide - Selecting Indoor unit 


31. Choose indoor 

unit (if required) 

38. Click Accessory (if any required) 


41. Click OK 

31. Choose indoor unit (if required) 


33. Choose indoor unit type 

34. Choose indoor unit model 

40. Select the type of accessory 

35. Position of indoor unit or outdoor unit 

36. Select elevation from O/D 


43 



35. Position of I/D w.r.t 

outdoor unit 

36. Select elevation from O/D 

37. IDU capacities & design load will 

appear automatically (Fixed) 

42. Finally Click OK 

37. IDU capacities & design load will appear automatically (Fixed) 



40. Select the type of accessory 

41. Click OK 

42. Finally Click OK

User Guide - If selecting Y-branch or Header branch 

43. Double click on Stand by icon 


47. If Y branch is selected then 

stand-by box will change 

into y branch with 2 more 

connected stand-by boxes. 

43. Double click on Stand by icon 


45. If at stand by box Y branch is required select Y branch 

46. And if header branch is required select header 

44 


45. If at stand by box Y branch is 

required select Y branch 

46. And if header branch is 

required select header 

48. And If header branch is 

selected then stand-by box 

will change into multi branch. 

47. If Y branch is selected then stand-by box will change into y branch with 2 

more connected stand-by boxes. 

48. And If header branch is selected then stand-by box will change into multi 

branch.

User Guide - After selecting Y-branch 

Multi V plus 10hp outdoor unit is selected 


Multi V plus 10hp outdoor unit is selected 

49. As per the design select different Y-branches 

(if needed header can also be used) 

45 

49. As per the design select different 

Y-branches 

(if needed header can also be used)

User Guide 


46 

50.Double click on Stand by for 

selecting indoor unit or you can 

select indoor unit by dragging 

requisite indoor icon from icon 

plate 



54.Select elevation from 

outdoor unit 

55. IDU capacities & design 

load will appear 

automatically (Fixed value 

depend on I/D) 

50.Double click on Stand by for selecting indoor unit or you can select indoor unit 

by dragging requisite indoor icon from icon plate 



54.Select elevation from outdoor unit 

55.IDU capacities & design load will appear automatically 

(Fixed value depend on I/D)

User Guide 

55. Selected indoor unit 

This space will show required load 


55. Selected indoor unit 

47 

This space will show required load

User Guide 

Selected indoor type and 

capacities will be seen on tree 

section like this 


After selecting indoor units at stand-by locations 

Room icons (space) will appear next to each indoor 

unit. Here we can select loads which are feed 

manually or software calculated load. 

After selecting indoor units at stand-by locations Room icons (space) will appear 

next to each indoor unit. Here we can select loads which are feed manually or 

software calculated load. 

Selected indoor type and capacities will be seen on tree section like this 

48

User Guide 

57. Select the load for each space one 

by one. After double clicking on 

space click value on pop-up 

window which we have to assign at 

that space and click OK 

56. Double click on each space will show this window 


49 

56. Double click on each space will 

show this window 

57. Select the load for each space one by one. After double clicking on space 

click value on pop-up window which we have to assign at that space and click OK

User Guide 

Load will be shown for each case like this 


50 

Load will be shown for each case like this

User Guide 


51 

58. Reselect indoor unit according to the 

required load (appearing under space). 

Chosen indoor unit should be such that 

their capacity is slightly higher than 

required load 

58. Reselect indoor unit according to the required load 

(appearing under space). 

Chosen indoor unit should be such that their capacity is slightly higher than 

required load

User Guide 


59. Double click on pipe lengths for 

selecting various piping lengths 

between outdoor unit, Y branch and 

indoor units 

52 

60. At double clicking piping length this 

window will appear. Filled required 

length and then click OK 

59. Double click on pipe lengths for selecting various piping lengths between 

outdoor unit, Y branch and indoor units 

60. At double clicking piping length this window will appear. Filled required length 

and then click OK

Check : 

User Guide 


2 

3 

4 

1. Percentage of indoor unit capacity to required load should be more than 100%. 

2. Number of connectable indoor unit should be less than maximum connected 

unit 

3. Combination ratio of Indoor to outdoor should be between 100% to 130% 

4. Total piping length should be less than maximum allowed piping length 

53 

1

User Guide 


61. Click auto piping button 

This pop up message will appear which mean 

piping is done successfully 

If not warning message will appear 

54 

You can choose Y-branch manually or they 

will be automatically selected while 

executing Auto Piping.For choosing Ybranch 

double click on Y-branch icon 

61. Click auto piping button 

You can choose Y-branch manually or they will be automatically selected while 

executing Auto Piping.For choosing Y-branch double click on Y-branch icon 

This pop up message will appear which mean piping is done successfully 

If not warning message will appear

User Guide 

If the system is not properly 

balanced then a warning message 

will pop-up 


62. Click system check button for final system 

balance check. 

55 

This pop-up message will appear that 

system check was successfully 

executed 

62. Click system check button for final system balance check. 

If the system is not properly balanced then a warning message will pop-up 

This pop-up message will appear that system check was successfully executed

User Guide 

Outdoor unit is still within the 

limits of 130% capacity 


1 

6 

3 

So indoor unit 1,3,6,7 are short in the cooling capacity (less than 100%) as 

per required loads (as shown by circles).This require increasing of indoor 

unit capacity 7 

56 

Ratio of indoor unit capacity to required 

load should be more than 100% 

Ratio of indoor unit capacity to required load should be more than 100% 

Outdoor unit is still within the limits of 130% capacity 

So indoor unit 1,3,6,7 are short in the cooling capacity (less than 100%) as per 

required loads (as shown by circles). 

This require increasing of indoor unit capacity

User Guide 


63. After upgrading the unit by 1 or 2 steps towards 

higher capacity and then repeat the following. 

Click “auto piping” button and then “system check” 

57 

Warning message “indoor unit capacity 

exceeds the outdoor unit capacity connection 

combination” 

64. Click OK on the message and change the outdoor unit to higher capacity 

63. After upgrading the unit by 1 or 2 steps towards higher capacity and then 

repeat the following. 

Click “auto piping” button and then “system check” 

64. Click OK on the message and change the outdoor unit to higher capacity 

Warning message “indoor unit capacity exceeds the outdoor unit capacity 

connection combination”

User Guide 


65. After upgrading outdoor unit 

Click “auto piping” button and 

then “system check” 

66. Check for the optimal solution by again setting of indoor units till reach close to the required load 

(percentage ratio close to 100% but above 100%). 

65. After upgrading outdoor unit Click “auto piping” button and then “system 

check” 

66. Check for the optimal solution by again setting of indoor units till reach close 

to the required load 

(percentage ratio close to 100% but above 100%). 

58

User Guide 

Outdoor unit is within 

limit of 130% capacity 

Outdoor unit is within limit of 130% capacity 

Final solution is successful. 


59 

Example 

Final solution is successful.

User Guide 


67. Next click on Schematic diagram 

icon for seeing schematic view of 

this drawing 

67. Next click on Schematic diagram icon for seeing schematic view of this 

drawing 

60

User Guide 

68. Next click on Generate Report for 

making excel sheet of this 

selection 


Click either of these icon for seeing 

control wire, power line and pipe 

line 

61 

clicking Schematic diagram 

icon will give schematic line 

view of 

1. Control wire 

2. Power line 

3. Pipe line 

68. Next click on Generate Report for making excel sheet of this selection 

clicking Schematic diagram icon will give schematic line view of 

Control wire 

Power line 

Pipe line

User Guide 

69. This menu will popup. 


62 

69. This menu will popup. 

Clicking each menu will 

generate the report 

corresponding to that issue. 

70. Finally press ok for viewing the 

above choose report on excel sheet 

Note: You need MS Excel program 

installed on your computer for 

executing this command 

Clicking each menu will generate the report corresponding to that issue. 

70. Finally press ok for viewing the above choose report on excel sheet 

Note: You need MS Excel program installed on your computer for executing this 

command

User Guide – Final Report 


1. Proposal Sheet 2. Contact Detail Sheet 3. Table of Contents Sheet 

1. Proposal Sheet 

2. Contact Detail Sheet 

3. Table of Contents Sheet 

63

User Guide - Final Report 

4. Building-Load Output Sheet 5. Model Selection Summary Sheet 6. Outdoor Model Selection Sheet 

4. Building-Load Output Sheet 

5. Model Selection Summary Sheet 

6. Outdoor Model Selection Sheet 


64



7. Indoor Model Selection Sheet 8. Model Selection Tree 

7. Indoor Model Selection Sheet 

8. Model Selection Tree 

65


9. Model Selection Diagram 


10. Model Selection Analysis Sheet 


66 

10. Model Selection Analysis Sheet

3. Multi V model selection 

by LATS Multi V software (with CAD) 


67

User Guide – Main contents 



2. Click on Create Project 3. Create Project Window will open 

9. Be sure to 

active CAD 

option if you are 

using CAD 

drawing for 

model selection 

68 








2. Click on Create Project 

3. Create Project Window will open 






9. Be sure to active CAD option if you are using CAD drawing for model selection 

10. Click Next

User Guide 





69 



13. Change design condition if 

given values not satisfied your 

requirement 

If you change one of the 

following air property 

(DBT,WBT,RH), psychometric 

process will execute and find 

other related value. So it’s easy 

to define air property. 

13. Change design condition if given values not satisfied your requirement 

If you change one of the following air property (DBT,WBT,RH), psychometric 

process will execute and find other related value. So it’s easy to define air 

property. 

14. Click Next

User Guide 

16. When selecting Open Load, 

You can load the result 

calculated by LATS-LOAD 



70 

17. Add floor or Add space as required. For 

adding and removing Floor or Space first click 

on the row and then click Add or Remove 




entry can also be done 

simply by adding values 

in columns 


16. When selecting Open Load, You can load the result calculated by LATS- 

LOAD 

17. Add floor or Add space as required. For adding and removing Floor or Space 

first click on the row and then click Add or Remove 

18. If LATS LOAD values are not available manual load entry can also be done 

simply by adding values in columns 

19. Click Next

User Guide 


71 

20. Input Customer & 

contractor Information it 

will be printed out while 


21. After filling all data click Finish 

20. Input Customer & contractor Information it will be printed out while making 

report. 

21. After filling all data click Finish

User Guide – Import Auto CAD drawing 


72 


23. Click this Icon for importing Auto CAD drawing 


23. Click this Icon for importing Auto CAD drawing

User Guide 

Save Project 

System Setting 

New System 

Copy System 

Delete System 

Auto piping 

System Check 

System Validation property 

Toggle description 

System load summary 

View reports 

System preview (Tree only) 


Toggle Navigator 

System Panel 

Control Line 

Power Cable 

Pipe Line 

73 

Arrow 

New Outdoor 

New Indoor 

New Room 

New Pipe 

New Equipment 

New Climb 

Delete Unit 

Rotate Unit 

Rotate Angle 

Create Net 

Undo 

Redo 

Zoom in 

Zoom out 

Zoom window 

Fit window 

Pan 

Grid on/off 

Ortho on/off 

Import DWG file 

Export DXF file

User Guide 


24. Select CAD drawing and then click Open icon 

25. This will open CAD drawing with message 

“CAD file is successfully open” . Click OK 

on this pop-up window 

24. Select CAD drawing and then click Open icon 

25. This will open CAD drawing with message “CAD file is successfully open” . 

Click OK on this pop-up window 

74

User Guide 


26. Choose proper scale for opening CAD 

drawing and then click OK 

26. Choose proper scale for opening CAD drawing and then click OK 

75

User Guide 


27. You can see imported CAD drawing like 

this. If it is out of screen area click Fit 

Window icon for resizing it 

27. You can see imported CAD drawing like this. If it is out of screen area click Fit 

Window icon for resizing it 

76

User Guide 


28. Click on the New Room icon for specifying 

load to different location 


30. When selecting Open Load, You can load the result calculated by LATS-LOAD 

77 



entry can also be done 

simply by adding values in 

columns 

33. Click on any one row for 

locating that row load in 

drawing and then click OK 

31. Add floor or Add space as required. For adding and 

removing Floor or Space first click on the row and then 

click Add or Remove 

28. Click on the New Room icon for specifying load to different location 


30. When selecting Open Load, You can load the result calculated by LATS- 

LOAD 

31. Add floor or Add space as required. For adding and removing Floor or Space 

first click on the row and then click Add or Remove 

32. If LATS LOAD values are not available manual load entry can also be done 

simply by adding values in columns 

33. Click on any one row for locating that row load in drawing and then click OK

User Guide 


78 

34. Click your cursor on 

specific location (in CAD 

drawing) where you want 

to locate this load. 

35. Similarly choose other 

location by repeating steps 

from 28 to 34 

34. Click your cursor on specific location (in CAD drawing) where you want to 

locate this load. 

35. Similarly choose other location by repeating steps from 28 to 34

User Guide 



39. Accessory window will appear 

40. Click OK 

36. Click Indoor unit 

icon 

79 

37. This window will 

open 


42. Choose indoor unit 

model 

43. Choose indoor unit 

elevation w.r.t the 

floor 

44. Product specific default 

values 

45. Software will automatically 

take feed load value after 

“Create “Network” command 

execution. 

46. Finally Click OK 

36. Click Indoor unit icon 

37. This window will open 


39. Accessory window will appear 

40. Click OK 



43. Choose indoor unit elevation w.r.t the floor 

44. Product specific default values 

45. Software will automatically take feed load value after “Create “Network” 

command execution. 

46. Finally Click OK

User Guide 


80 

47. Then click your cursor at 

specific location where you 

want to locate your indoor unit 

48. You can see indoor unit icon 

like this 

49. Repeat the same steps from 36 th to 

48 th for locating other indoor unit. 

You can also use copy paste 

command for locating other indoor 

units. 

47. Then click your cursor at specific location where you want to locate your 

indoor unit 

48. You can see indoor unit icon like this 

49. Repeat the same steps from 36th to 48th for locating other indoor unit. 

You can also use copy paste command for locating other indoor units.

User Guide 


50. Join all indoor unit center to 

their corresponding room center 

by using “New Pipe” command 

Note: Failure to this will not 

allocate design load to the 

rooms while making Tree 

System. 

50. Join all indoor unit center to their corresponding room center by using “New 

Pipe” command 

Note: Failure to this will not allocate design load to the rooms while making Tree 

System. 

81

User Guide 


82 

51. Adjust indoor unit direction by 

clicking Indoor Unit and then 

Rotate Angle icon (As per the 

piping direction required) 


appear 

53. Fill the required rotation 

angle and then click OK 

Note: All rotation will take 

place by considering initial 

position as reference 

54. You can see pipe 

connecting point ( dash) 

at this location of indoor 

unit 

51. Adjust indoor unit direction by clicking Indoor Unit and then Rotate Angle icon 

(As per the piping direction required) 


53. Fill the required rotation angle and then click OK 

Note: All rotation will take place by considering initial position as reference 

54. You can see pipe connecting point ( dash) at this location of indoor unit

User Guide 

57. Select optional 

accessory if required . 


55. Click Outdoor Unit icon 


83 

58. Auto Selection is only 

possible after successful 

connection of indoor 

units through “Network 

Create” command 

59. Select proper unit as per 

indoor load requirements 

60. Select defrost factor 

(Heat Pump model ) 



55. Click Outdoor Unit icon 


57. Select optional accessory if required . 

58. Auto Selection is only possible after successful connection of indoor units 

through “Network Create” command 

59. Select proper unit as per indoor load requirements 

60. Select defrost factor 

(Heat Pump model ) 


62. After selecting above value click OK

User Guide 


63. Then click your cursor at 

specific location where you 

want to locate your outdoor unit 

64. You can see outdoor unit icon 

like this 

63. Then click your cursor at specific location where you want to locate your 

outdoor unit 

64. You can see outdoor unit icon like this 

84

User Guide 

65. Click “New Equipment” icon 



65. Click “New Equipment” 

icon 


appear 

67. Select Y-branch or Header when required . 

85 

67. Select Y-branch or Header 

when required .

User Guide 


68. Click your cursor at specific 

location where you want to 

locate your Y branch 

86 

69. You can see Y branch icon like this 

70. You can further adjust Y-branch 

direction by clicking Y-branch 

and then Rotate Angle icon 


72. Fill required rotation angle 

and then click OK 

Note: All rotation will take 

place by considering initial 

position as reference 

68. Click your cursor at specific location where you want to locate your Y branch 

69. You can see Y branch icon like this 

70. You can further adjust Y-branch direction by clicking Y-branch and then 

Rotate Angle icon 


72. Fill required rotation angle and then click OK 

Note: All rotation will take place by considering initial position as reference

User Guide 


87 

73. Finally your drawing will looks 

like this having icons of room 

load, indoor units, outdoor unit 

and Y branch/header 

73. Finally your drawing will looks like this having icons of room load, indoor 

units, outdoor unit and Y branch/header

User Guide 


74. Click “New Pipe” 

icon 

88 

Ortho 

On/Off 

75. Then click & drag with left 

button of your mouse on the 

drawing and finally release this 

button at indoor/ Y-branch 

connecting point 

76. You can see refrigerant pipes 

drawn between outdoor and Ybranch 

or Y-branch and I/D units . 

77. Complete the piping circuit at 

various points like outdoor unit, Ybranch/ 

header and indoor units. 

78. Note : Use Ortho On/Off option for drawing 

orthogonal pipe. After drawing pipes click 

mouse right button on the pipe (on white color 

identifier at the middle of pipe) and drag it 

slightly by pressing “Shift Key” for placing 

your pipe orthogonally. 

74. Click “New Pipe” icon 

75. Then click & drag with left button of your mouse on the drawing and finally 

release this button at indoor/ Y-branch connecting point 

76. You can see refrigerant pipes drawn between outdoor and Y-branch or Ybranch 

and I/D units . 

77. Complete the piping circuit at various points like outdoor unit, Y-branch/ 

header and indoor units. 

78. Note : Use Ortho On/Off option for drawing orthogonal pipe. After drawing 

pipes click mouse right button on the pipe (on white color identifier at the middle 

of pipe) and drag it slightly by pressing “Shift Key” for placing your pipe 

orthogonally.

User Guide 



79. In the Floor Viewer, You can add new floor 

80. Right click on Floor icon for adding, 

deleting and editing floors. 

89 

81. After adding floor right click on 

the same floor (Floor2 icon) and 

click Edit icon. 

83. Fill the floor height (Height 

from the linked floor) and 

then click Ok. 

84. For adding CAD drawing on 

the newly added floor 

perform steps from 23 to 27. 

79. In the Floor Viewer, You can add new floor 

80. Right click on Floor icon for adding, deleting and editing floors. 

81. After adding floor right click on the same floor (Floor2 icon) and click Edit 

icon. 


83. Fill the floor height (Height from the linked floor) and then click Ok. 

84. For adding CAD drawing on the newly added floor perform steps from 23 to 

27.

User Guide 


90 

85. Click “New Climb” icon for 

connecting added floor (Floor2) 

to the previous floor (Floor0). 


87. Select the floor to be 

linked with the present 

drafting floor and click 

Ok. 

85. Click “New Climb” icon for connecting added floor (Floor2) to the previous 

floor (Floor0). 


87. Select the floor to be linked with the present drafting floor and click Ok.

User Guide 


91 

88. Click the cursor at the desired 

point to locate the “climb 

piping”. 

89. You can see this Icon and 

message showing connected 

floor 

88. Click the cursor at the desired point to locate the “climb piping”. 

89. You can see this Icon and message showing connected floor

User Guide 


92 

90. After adding the new floor repeat 

operation from 28 to 78 for adding 

Room, Indoor Units, Y-branch/Header 

and Pipes on the new floor. 

90. After adding the new floor repeat operation from 28 to 78 for adding Room, 

Indoor Units, Y-branch/Header and Pipes on the new floor.

User Guide 


Error message in the System Log 

Viewer 

93 

91. Click “Create Network” icon for 

checking the connected network. 

92. Error message is displayed on 

the error log whenever the 

connection between pipe and I/D 

unit, Y-branch or O/D unit is not 

proper with Error Icon located on 

wrong connection 

93. Remove the error before 

proceeding further. 

91. Click “Create Network” icon for checking the connected network. 

92. Error message is displayed on the error log whenever the connection 

between pipe and I/D unit, Y-branch or O/D unit is not proper with Error Icon 

located on wrong connection 

93. Remove the error before proceeding further. 

Error message in the System Log Viewer

User Guide 


95. If there is no error then “Network 

Completion” message will appear 

in 

System Log Viewer 

94 

94. After removing the error , again 

click Create Network icon. 

94. After removing the error , again click Create Network icon. 

95. If there is no error then “Network Completion” message will appear in 

System Log Viewer

User Guide 


96. Click Auto Piping icon 

97. Auto Piping command 

automatically selects Ybranch/Header 

branch name, 

pipe diameter and pipe length 

96. Click Auto Piping icon 

97. Auto Piping command automatically selects Y-branch/Header branch name, 

pipe diameter and pipe length 

95

User Guide 


98. Click System Check icon 

99. On the successful execution of this 

command this window will pop-up 

100. If there is an error message. 

Fix the error and perform 

1. Create Network 

2. Auto piping 

3. System Check 

again 

98. Click System Check icon 

99. On the successful execution of this command this window will pop-up 

100. If there is an error message. Fix the error and perform 

1. Create Network 

2. Auto piping 

3. System Check again 

96

User Guide 


101. Click Tree icon to view 

line diagram of this system 

101. Click Tree icon to view line diagram of this system 

97

User Guide 


103. Click either of these icon for 

seeing control wire, power line 

and pipe line 

102. Click Schematic Diagram icon 

for seeing schematic diagram 

of the system 

98 

104. Click Drawing Export icon 


106. Input name of exporting 

file and click Save 

102. Click Schematic Diagram icon for seeing schematic diagram of the system 

103. Click either of these icon for seeing control wire, power line and pipe line 

104. Click Drawing Export icon 


106. Input name of exporting file and click Save

User Guide 


107. Click Generate Report 

icon 

107. Click Generate Report icon 

108. This Window will pop up. 

99 

108. This Window will pop up. 

Clicking each menu will generate the 

corresponding report 

109. Finally press ok for viewing the above 

selected report on excel sheet 

Note: You need MS Excel program installed 

on your computer for executing this 

command 

Clicking each menu will generate the corresponding report 

109. Finally press ok for viewing the above selected report on excel sheet 

Note: You need MS Excel program installed on your computer for executing this 

command

User Guide 


1. Proposal Sheet 2. Contact Detail Sheet 3. Table of Contents Sheet 

1. Proposal Sheet 

2. Contact Detail Sheet 

3. Table of Contents Sheet 

100


4. Building-Load 

Output Sheet 

4. Building-Load Output Sheet 

5. Model Selection Summary Sheet 

6. Outdoor Model Selection Sheet 


5. Model Selection 

Summary Sheet 

101 

6. Outdoor Model 

Selection Sheet


7. Indoor Model Selection Sheet 

8. Model Selection Tree 


7. Indoor Model Selection Sheet 8. Model Selection Tree 

102



9. Model Selection Diagram 10. Model Selection Analysis Sheet 


10. Model Selection Analysis Sheet 

103

User Guide - Tips 

1. When outdoor unit is below the indoor units 


This software always consider 

outdoor unit on topmost floor of 

the Floor Viewer. 

It is a height between 

chosen floor and linked 

floor (can’t be negative) 

Height of the indoor unit from 

the floor on which it is located 

All the distance in Floor Viewer are 

defined from ground level 

104

User Guide 

2. When outdoor is above indoor unit 


1. Outdoor unit is place on the topmost floor of the Floor Viewer 

(Floor0) 

2. Floor1 is linked with Floor0 and Floor2 is linked with Floor1 

which implies height between floor 0 and 1 is 5m (15 - 10) and 

height between floor 2 and 1 is 10m (10 – 0) 

3. The below most row in this column (Floor2) is the floor placed 

at ground level. 

3. When indoor units are placed above and below the outdoor unit 

All the distance in Floor Viewer are 

defined from ground level 

1. Outdoor unit is place on the topmost floor of the Floor Viewer 

(Floor0) 

2. Floor1 is linked with Floor0, Floor2 is linked with Floor0 and 

floor3 is linked with floor2 which implies height between floor 0 

and 1 is 5m (15 - 10), height between floor 2 and 0 is 5m (10 – 

5) and height between floor 3 and 2 is 5m (5-0) 

3. The below most row in this column (Floor3) is the floor placed 

at ground level. 

105

LATS – Multi V - Klimatizace TSC

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