5
Introduction
1.3 Combination
Utilizing an inverter control, a wide range of operation capacity control is also available. A maximum total combination
capacity of 150% and a minimum total combination capacity of 50% can be chosen by combination of the indoor units when
compared with the nominal outdoor unit capacity. Therefore, the new system can meet individual air conditioning requirements
in most oce buildings.
Outdoor Unit
Model (kBtu/h)
Min. Single-
Individual
Operation (kBtu/h)
Max.
Number of
Connectable I.U.
Recommended
Number of
Connectable I.U.
Max.
Number of Connectable
Water Modules for
Application Case 1&3
(Chapter 1.2)
Max.
Number of Connectable
Water Modules for
Application Case 2
(Chapter 1.2)
72
05
13 8 1 3
96
16 10 2 3
120
19 10 2 4
144
23 16 3 5
168
29 16 4 7
192
33 18 4 7
216
36 20 5 8
240
43 26 6 10
264
47 32 6 11
288
50 32 7 11
312
53 32 7 12
336
59 32 8 12
360
64 38 8 12
384
64 38 9 12
408
64 38 9 12
432
64 38 10 12
456
64 38 11
12
NOTE:
(1) In a system where all indoor units operate at the same time and the same mode, total capacity of these indoor units
should not be larger than combined capacity of the outdoor units, otherwise overload may occur under severe working
condition or within narrow operating range.
(2) If the system is used in the cold area (ambient temperature becomes under 14°F(-10°C)) or under the high heating load
conditions, the total indoor unit capacity should be less than 100% against the outdoor unit and total piping length is less
than 984ft.(300m).
(3) 05/07 type indoor units are set with higher air ow. Determine the working environment and installation location carefully.
Do not install these units in the place where the cold draft may occur during heating operation. If the unit is installed in
such places, the number of connectable I.U. should be less than the recommended number on the table above.
(4) When the connected indoor units contain Cassette Type or Wall-Mounted Type,and the nominal capacity is less than or
equal to 12kBtu/h, the total indoor unit capacity should be equal to or less than 130% against the outdoor unit.
(5) When the outdoor air temperature is more than 109.4°F(43
°C
) during the cooling operation, the total indoor unit capacity
should be equal to or less than 100% against the outdoor unit.
(6) If the operational capacity of indoor units at the same mode is more than 130% against the outdoor unit, the indoor units
should be set to low airow operation.
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