Panasonic U-72MF1U9, Installation Instructions Manual, Page: 11 / 56

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Table 1-10-2 Necessary Amount of Refrigerant Charge Per Outdoor Unit
Further charge a certain amount listed below in addition to the amount of refrigerant charge.
U-72MF1U9
U-72MF1U9E
U-96MF1U9
U-96MF1U9E
42 oz/unit 42 oz/unit
1-9. System Limitations
Table 1-11 System Limitations
Max. No. allowable connected outdoor units 3
Max. capacity allowable connected outdoor units 288,000 BTU/h (24 ton, 84.4 kw)
Max. connectable indoor units 40*¹
Max. allowable indoor/outdoor capacity ratio 50 – 130 %
*1: In the case of 16 ton (type 192,000 BTU/h) or smaller units, the number is limited by the total capacity of the connected indoor
units.
1-10. Installation Standards
Relationship between A/C units and refrigerant tubing
Common solenoid valve kit
● Multiple indoor units under group control can utilize a solenoid valve kit in common.
● Categories of connected indoor unit capacities are determined by the solenoid valve kit.
Type of solenoid valve kit Total capacity of indoor units (BTU/h)
160 19.000 < Total capacity < 54.600
56 7.500 < Total capacity < 19.000
●
If the capacity range is exceeded, use 2 solenoid valves connected in parallel.
Outdoor unit Outdoor unit Indoor unit
Suction tube
Discharge tube
Liquid tube
Balance tube
Suction tube
Discharge tube
Liquid tube
Gas tube
Liquid tube
4-tube layout 3-tube layout 2-tube layout
Solenoid
valve kit
Indoor unit
Room
Hallway
Indoor unit
Room
Indoor unit
Room
Hallway
Indoor unit
Room
Solenoid
valve kit
Solenoid
valve kit
● Install the solenoid valve kit 98 ft. or less from the indoor unit.
●
In quiet locations such as hospitals, libraries, and hotel rooms, the refrigerant noise may be somewhat noticeable. It
is recommended that the solenoid valve kit be installed inside the corridor ceiling, at a location outside the room.
Desirable Undesirable
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