3.1 Selection procedure
Outdoor units selection
In general, an outdoor unit may be selected as follows, though the location of the unit, and usage of the room, etc. should
be considered. The combination of indoor and outdoor units should be determined so that the sum of indoor unit capacity
index is smaller than the max. combination capacity of the outdoor unit. Up to max.8 indoor units can be connected to one
outdoor unit. It is recommended to choose a large capacity outdoor unit if the installation space is large enough.
Indoor units selection
Look up the table on combination of indoor and outdoor units, and determine the appropriate indoor unit capacity which sat-
isfies the given thermal load.
For proper system operation, refer to the following:
1) At least 2 indoor units should be connected to outdoor unit.
2) Total capacity of indoor units connected should be minimum 40% of outdoor unit above mentioned capacity.
3) Calculation method for total capacity index = sum up the capacity index of connected indoor units.
Model name
Heat pump
20,000 32,000 48,000
24,000 36,000 54,000
3 4 8
36 48 65
MR24DY3JMA MR36TQY3JMA MR48DEY3JM
Capacity
(Btu/h)
Connectable
indoor units
Maximum No. of
connectable indoor units
Cooling
Heating
Max. capacity index of
connectable indoor units
Unit Capacity(kBtu/h Class) 9 12 18
Capacity Index 9 12 18
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