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Design of Mini VRF SYSTEM
1. Model Selecting and Capacity Calculator
Select the model and calculate the capacity for each refrigerant system according to the procedure shown below.
Calculation of the indoor air-conditioning load
Calculate the maximum air-conditioning load for each room or zone.
Selection of an air conditioning system
Select the ideal air conditioning system for air conditioning of each room or zone.
Design of the control system
Design a suitable control system for the selected air conditioning system.
Preliminary selection of indoor and outdoor units
Make preliminary selections that are within the allowable range for the system.
...........
2-4 ~ 2-7
Check of the tubing length and elevation difference
Check that the length of refrigerant tubing and the elevation difference are within the allowable
ranges................................................................................................................................... 2-6, 7
Calculation of the corrected outdoor unit capacity
Capacity correction coefficient for model.................................................................................. 2-8
Capacity correction coefficient for tubing length and elevation difference.............................. 2-11
Heating capacity correction coefficient for frosting/defrosting................................................. 2-10
Calculation of the corrected capacity for each indoor unit
Capacity correction coefficient for indoor temperature conditions............................................ 2-9
Capacity distribution ratio based on the tubing length and elevation difference.............2-9 ~ 2-11
Recheck of the actual capacity for each indoor unit
If the capacity is inadequate, reexamine the unit combinations.
Example 1: Increasing the outdoor unit capacity.....................................................................2-13
Increasing the tubing size......................................................................................................... 2-5
Design of tubing
Create a tubing design which minimizes the amount of additional refrigerant charge as much as
possible........................................................................................................................... 2-4 ~ 2-7
Select the tubing size for the main tube (LA) up to the No. 1 distribution joint based on the rated
cooling capacity of the outdoor unit. Select tubing sizes after the distribution point based on the
total rated cooling capacity of the connected indoor units.
Calculation of additional refrigerant charge amount
Calculate the additional refrigerant charge from the diameters and lengths of the refrigerant
tubing. ...................................................................................................................................... 2-6
Check the minimum indoor capacity (limit density) with respect to the amount of refrigerant. If the
limit density is exceeded, be sure to install ventilation equipment or take other corrective steps.... 2-7
Design of electrical wiring capacity
Select a wiring capacity according to the method of power supply......................................... 2-18
1-2. Procedure for Selecting Models and Calculating Capacity
Model Selection Procedure
TD831155-04_MINI VRF.indb 3
TD831155-04_MINI VRF.indb 3
2014/05/09 15:29:01
2014/05/09 15:29:01
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