1-9. System Limitations; 1-10. Installation Standards - Panasonic U-72MF1U9 Installation Instructions Manual

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-96MF1U9
U-72MF1U9E U-96MF1U9E
42 oz/unit 42 oz/unit

1-9. System Limitations

Table 1-11 System Limitations
Max. No. allowable connected outdoor units
Max. capacity allowable connected outdoor units
Max. connectable indoor units
Max. allowable indoor/outdoor capacity ratio
*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
4-tube layout
Outdoor unit
Suction tube
Discharge tube
Liquid tube
Balance tube
● 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
Room
Indoor unit
Hallway
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
56
● If the capacity range is exceeded, use 2 solenoid valves connected in parallel.
288,000 BTU/h (24 ton, 84.4 kw)
50 – 130 %
3-tube layout
Outdoor unit
Suction tube
Discharge tube
Liquid tube
Room
Indoor unit
Solenoid
valve kit
19.000 < Total capacity < 54.600
7.500 < Total capacity < 19.000
11
3
40*¹
2-tube layout
Solenoid
valve kit
Gas tube
Liquid tube
Undesirable
Room Room
Indoor unit Indoor unit
Hallway
Indoor unit
Solenoid
valve kit