Panasonic U-72MF2U9 Technical Data Manual page 27

1. Model Selection and Capacity Calculator
1-8. 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 164 ft. (50m) 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.
The solenoid valve kit must be located not less than 8.2 ft. (2.5m) above the floor or that cannot be touched.
Strongly recommended installation
Room Room
Indoor unit 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
160
56
If the capacity range is exceeded, use 2 solenoid valves connected in parallel.
Always check the gas density limit for the room in which the unit is installed.
WARNING
1-9. Check of Limit Density
When installing an air conditioner in a room, it is necessary to ensure that even if the refrigerant gas accidentally leaks out, its
density does not exceed the limit level for that room.
3-tube layout
Outdoor unit
Suction tube
Discharge tube
Liquid tube
Room
Indoor unit
Hallway
Solenoid
valve kit
Capacity of indoor unit
Type 24 - 54
Type 18 or under
2-tube layout
Solenoid
valve kit
Avoid
Room
Indoor unit
2 - 11
Design of 3WAY VRF SYSTEM
Outdoor unit
Gas tube
Liquid tube
Solenoid
valve kit
1
2
3
4
5
6
7
8
9