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II - 3
Design of W-ECO MULTI SYSTEM
2
TD831077
1. Model Selecting and Capacity Calculation
1-2. Procedure for selecting models and calculating capacity
Select the model and calculate the capacity by using the procedure below.
Recheck of the indoor unit
capacity and outdoor unit
combination capacity
Preliminary selection of
indoor unit and outdoor
unit combination
Calculation of capacity correc-
tion based on the indoor/
outdoor capacity ratio
Capacity correction based on
the tubing length,
elevation difference, and
operating air conditions
Check of the tubing length and
elevation difference between
indoor and outdoor units
Selection of air-conditioning
system
Design of control system
Selection of indoor unit model
Calculation of the indoor
air-conditioning load
¶
Calculate the maximum air-conditioning load of each room or zone.
¶
Select the ideal air-conditioning system for the air conditioning of each room
or zone.
¶
Design a suitable control system for the selected air-conditioning system.
¶
Select the model matching the selected air-conditioning system.,
(See the section on system configuration.)
¶
Make a preliminary selection for the indoor and outdoor units combination
that is within the system’s allowable range. (ref. P. II-12, 13, 14.)
[An indoor unit capacity of up to 130% with respect to the outdoor unit
capacity can be connected, but the capacity ratio does not exceed 130%.
¶
If the total capacity of the indoor unit exceeds the capacity of the outdoor
unit, calculate capacity correction.
¶
Examine the positioning of the units so that the refrigerant tubing length and
the elevation difference is within the allowable range. (ref. P. II-12.)
¶
Calculate capacity correction based on the operating air conditions, tubing
length (equivalent length), and indoor/outdoor unit elevation difference. (Be
sure to also take into account the heating capacity correction coefficient for
frosting/defrosting when heating.)
(ref. P. II-8, 9 (For R407C), ref. P. II-10, 11 (For R22).)
¶
If the capacity of the preliminary selected model is inadequate as a result of
the capacity correction, reexamine the combination.
¶
If the tubing expansion is expected in the future, make the
tubing design with adequate consideration for this expansion.
¶
Calculate the additional charge amount from the refrigerant tubing diameter
and length in the tubing system diagram.
¶
Check the minimum indoor capacity and floor area (limit density) with
respect to the refrigerant amount. If the limit density is exceeded, be sure to
always examine the ventilation and other equipment. (ref. P. II-14, 16, 17, 18.)
¶
Select the wire size according to the power supply system being used.
(ref. P. II-19.)
Calculation of additional
refrigerant charge amount
Selection of electrical
wire size
Design of tubing